MICROCHIP DM330031 User guide

dsPIC33CK Low-Voltage

Motor Control Board

User’s Guide

 2020 Microchip Technology Inc. DS50002927A

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Trademarks

The Microchip name and logo, the Microchip logo, Adaptec,
AnyRate, AVR, AVR logo, AVR Freaks, BesTime, BitCloud, chipKIT,
chipKIT logo, CryptoMemory, CryptoRF, dsPIC, FlashFlex,
flexPWR, HELDO, IGLOO, JukeBlox, KeeLoq, Kleer, LANCheck,
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are registered trademarks of Microchip Technology Incorporated in
the U.S.A. and other countries.

APT, ClockWorks, The Embedded Control Solutions Company,
EtherSynch, FlashTec, Hyper Speed Control, HyperLight Load,
IntelliMOS, Libero, motorBench, mTouch, Powermite 3, Precision
Edge, ProASIC, ProASIC Plus, ProASIC Plus logo, Quiet-Wire,
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II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in
other countries.
All other trademarks mentioned herein are property of their
respective companies.

© 2020, Microchip Technology Incorporated, All Rights Reserved.

For information regarding Microchip’s Quality Management Systems,
please visit www.microchip.com/quality.

ISBN: 978-1-5224-5762-6

DS50002927A-page 2  2020 Microchip Technology Inc.

dsPIC33CK LOW-VOLTAGE

MOTOR CONTROL BOARD

USER’S GUIDE

Table of Contents

Preface ........................................................................................................................... 5

Chapter 1. Introduction.................................................................................................. 9

1.1 Overview ........................................................................................................ 9

1.2 Features ....................................................................................................... 10

1.3 Block Diagram .............................................................................................. 11

Chapter 2. Board Interface Description ..................................................................... 13

2.1 Introduction ................................................................................................... 13

2.2 Board Connectors ........................................................................................ 13

2.3 User Interface Hardware .............................................................................. 19

2.4 Pin Functions of the dsPIC DSC .................................................................. 25

Chapter 3. Hardware Description ............................................................................... 29

3.1 Introduction ................................................................................................... 29

3.2 Hardware Sections ....................................................................................... 29

Appendix A. Schematics and Layout......................................................................... 43

A.1 Board Schematics and Layout ..................................................................... 43

Appendix B. Electrical Specifications........................................................................ 55

B.1 Introduction .................................................................................................. 55

Appendix C. Design Details ........................................................................................ 57

C.1 Introduction .................................................................................................. 57

C.2 Current Amplifier Circuits ............................................................................. 57

C.3 Auxiliary Power Supply ................................................................................ 61

Worldwide Sales and Service .................................................................................... 66

 2020 Microchip Technology Inc. DS50002927A-page 3

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

NOTES:

DS50002927A-page 4  2020 Microchip Technology Inc.

dsPIC33CK LOW-VOLTAGE

MOTOR CONTROL BOARD

USER’S GUIDE

Preface

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and
documentation are constantly evolving to meet customer needs, so some actual dialogs and/
or tool descriptions may differ from those in this document. Please refer to our website
(www.microchip.com) to obtain the latest documentation available.

Documents are identified with a “DS” number. This number is located on the bottom of each
page, in front of the page number. The numbering convention for the DS number is
“DSXXXXXXXXA”, where “XXXXXXXX” is the document number and “A” is the revision level
of the document.

For the most up-to-date information on development tools, see the MPLAB
Select the Help menu, and then Topics to open a list of available online help files.

®

IDE online help.

INTRODUCTION

This preface contains general information that will be useful to know before using the
dsPIC33CK Low-Voltage Motor Control Board. Topics discussed in this preface
include:

• Document Layout

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Website

• Product Change Notification Service

• Customer Support

• Document Revision History

DOCUMENT LAYOUT

The user’s guide describes the dsPIC33CK Low-Voltage Motor Control Board. The
document is organized as follows:

• Chapter 1. “Introduction” – This chapter introduces the board and provides a

brief overview of its features.

• Chapter 2. “Board Interface Description” – This chapter provides information

about the board input and output interfaces.

• Chapter 3. “Hardware Description” – This chapter describes the hardware

sections of the board.

• Appendix A. “Schematics and Layout” – This appendix provides board

schematics and layout.

• Appendix B. “Electrical Specifications” – This appendix summarizes the

electrical specifications.

• Appendix C. “Design Details” – This appendix provides design calculations for

certain hardware sections.

 2020 Microchip Technology Inc. DS50002927A-page 5

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog
A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

Underlined, italic text with
right angle bracket

Bold characters A dialog button Click OK

N‘Rnnnn A number in verilog format,

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Italic Courier New A variable argument file.o, where file can be

Square brackets [ ] Optional arguments mcc18 [options] file

Curly braces and pipe
character: { | }

Ellipses... Replaces repeated text var_name [,

A menu path File>Save

A tab Click the Power tab

where N is the total number of
digits, R is the radix and n is a
digit.

Filenames autoexec.bat
File paths c:\mcc18\h
Keywords _asm, _endasm, static
Command-line options -Opa+, -Opa-
Bit values 0, 1
Constants 0xFF, ‘A’

Choice of mutually exclusive
arguments; an OR selection

Represents code supplied by
user

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[options]

errorlevel {0|1}

var_name...]

void main (void)
{ ...
}

®

IDE User’s Guide

DS50002927A-page 6  2020 Microchip Technology Inc.

RECOMMENDED READING

This user’s guide describes how to use the dsPIC33CK Low-Voltage Motor Control
Board. The device-specific data sheets contain additional information on programming the
specific microcontroller or Digital Signal Controller (DSC) devices. Other useful
documents are listed below. The following Microchip documents are available and
recommended as supplemental reference resources:

dsPIC33CK256MP508 Family Data Sheet (DS70005349)

This document provides device-specific information for the dsPIC33CK256MP508
16-bit Digital Signal Controller with High-Resolution PWM and CAN Flexible Data
(CAN FD).

MCP2200 Data Sheet (DS50002106)

This document provides device-specific information for the MCP2200 USB 2.0 to
UART Protocol Converter with GPIO.

MPLAB® X IDE User’s Guide (DS50002027)

This document describes how to set up the MPLAB X IDE software and use it to
create projects and program devices.

Preface

AN1299, Single-Shunt Three-Phase Current Reconstruction Algorithm for
Sensorless FOC of a PMSM (DS01299)

AN1160, Sensorless BLDC Control with Back-EMF Filtering Using a
Majority Function (DS01160)

AN1078, Sensorless Field Oriented Control of a PMSM (DS01078)

AN1292, Sensorless Field Oriented Control (FOC) for a Permanent
Magnet Synchronous Motor (PMSM) Using a PLL Estimator and Field
Weakening (FW) (DS01292)

AN1017, Sinusoidal Control of PMSM Motors with dsPIC30F DSC
(DS01017)

Readme Files

For the latest information on using other tools, read the tool-specific Readme files in
the Readme subdirectory of the MPLAB X IDE installation directory. The Readme files
contain updated information and known issues that may not be included in this
user’s guide.

For step-by-step instructions to set up and run a motor control application using the
dsPIC33CK Low-Voltage Motor Control Board, refer to the Readme file provided along
with the motor control application code.

dsPIC33 Family Reference Manuals

Specific Family Reference Manuals (FRMs) are available for each module, which
explains the operation of the dsPIC
modules. The specifics of each device family are discussed in their data sheet.

To obtain any of these documents, visit the Microchip website at: www.microchip.com.

 2020 Microchip Technology Inc. DS50002927A-page 7

®

DSC MCU family architecture and peripheral

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

THE MICROCHIP WEBSITE

Microchip provides online support via our website at www.microchip.com. This website
is used as a means to make files and information easily available to customers.
Accessible by using your favorite Internet browser, the website contains the following
information:

• Product Support – Data sheets and errata, application notes and sample

programs, design resources, user’s guides and hardware support documents,
latest software releases and archived software

• General Technical Support – Frequently Asked Questions (FAQs), technical

support requests, online discussion groups, Microchip consultant program
member listing

• Business of Microchip – Product selector and ordering guides, latest Microchip

press releases, listing of seminars and events, listings of Microchip sales offices,
distributors and factory representatives

PRODUCT CHANGE NOTIFICATION SERVICE

Microchip’s customer notification service helps keep customers current on Microchip
products. Subscribers will receive e-mail notification whenever there are changes,
updates, revisions or errata related to a specified product family or development tool of
interest.

To register, access the Microchip website at www.microchip.com, click on Product

Change Notification and follow the registration instructions.

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

Customers should contact their distributor, representative or FAE for support. Local
sales offices are also available to help customers. A listing of sales offices and loca­tions is included in the back of this document.

Technical support is available through the website at: http://support.microchip.com.

DOCUMENT REVISION HISTORY

Revision A (March 2020)

This is the initial released version of this document.

DS50002927A-page 8  2020 Microchip Technology Inc.

dsPIC33CK LOW-VOLTAGE

MOTOR CONTROL BOARD

Chapter 1. Introduction

1.1 OVERVIEW

The dsPIC33CK Low-Voltage Motor Control Board is targeted to drive a low-voltage,
three-phase Permanent Magnet Synchronous Motor (PMSM) or Brushless DC (BLDC)
motor using the dsPIC33CK256MP508. This dsPIC
single-core 16-bit DSC with enhanced on-chip peripherals, such as
High-Resolution PWM (HRPWM),12-bit high-speed ADC cores, analog comparators with
DAC, op amps, QEI, CAN-FD, SENT, UART, SPI, I

In some instances of the document text, the dsPIC33CK Low-Voltage Motor Control Board
is also referred to as the ‘Motor Control Board’ to enhance readability. The Motor Control
Board is shown in Figure 1-1.

FIGURE 1-1: dsPIC33CK LOW-VOLTAGE MOTOR CONTROL BOARD

®

DSC features a 100 MIPS,

2

C, DMA, timers, etc.

USER’S GUIDE

 2020 Microchip Technology Inc. DS50002927A-page 9

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

1.2 FEATURES

Key features of the Motor Control Board are as follows:

• Three-Phase Motor Control Power Stage with the Following Electrical Specifications:

- Input DC voltage: 12V to 48V

- Nominal phase RMS current: 10A at +25°C ambient temperature

• Motor Phase Current Feedbacks to Implement Field-Oriented Control (FOC) of a
PMSM/BLDC Motor

• DC Bus Current Feedback for Overcurrent Protection and to Implement Single
Shunt Current Reconstruction Algorithm

• DC Bus Voltage Feedback for Overvoltage Protection

• Phase Voltage Feedbacks to Implement Sensorless Trapezoidal Control

• Hall Sensor Interface

• Quadrature Encoder Interface (QEI)

• On-Board Temperature Sensor for Monitoring the MOSFET Temperature

• Optional External Temperature Sensor (thermistor) Interface

• Debug Serial Interface (USB to UART)

• PICkit™ On-Board (PKOB4) for Programming and Debugging

• Two mikroBUS™ Sockets to Support Connectivity, Sensors and Communication
Interfaces by Plugging in mikroBUS Add-On Boards

• User Interface Elements:

- Two debug LEDs

- One potentiometer

- Three push buttons

- PWM indication LEDs

- Power-on status indication LED

• Auxiliary Power Supply to Power External Interfaces and On-Board Circuitry

DS50002927A-page 10  2020 Microchip Technology Inc.

1.3 BLOCK DIAGRAM

`

Debug

Interface

Push Buttons

LEDs

Potentiometer

DC-DC

Converter

(MIC28511)

DC-DC

Converter

(MCP16301)

+3.3V Output

LDO

(MCP1826)

Motor Terminal

Input Terminal

12-48 VDC, 24A

Input Jack

PKOB V4

MCLR

Push Button

ICSP Header

MIC4605 x 3

Half-Bridge MOSFET Drivers

Current

Sensing

Temp Sensor

for Thermal

Protection

Current

Sensing

Shunt

Position

Feedbacks

Quadrature

Encoder
Interface

Hall Sensor

Interface

Reset

Control

I/O Control – Analog, Digital, Pull-up, Pull -Down, Remappable, Change Notification

Program/

HR PWM

SCCP

DAC/

Comparators

QEI

Timer1

ADC – 2 x Dedicated Core and Shared Core

Op Amps

Clock

CLC

PTG

Interrupt

Control

Temperature

_

Current Shunt Feedbacks

Op Amps for

Phase

Currents

Amplification

I

A_EXT,

I

B_EXT,

I

C_EXT

Op Amp for
Bus Current
Amplification

I

BUS_EXT

Voltages

Scaling

Circuit

g

_A

,

_B

,

_C

I

BUS_FILT_EXT

p

g

DC Voltage

Scaling

Circuit

BUS

mikroBUS Socket-B

mikroBUS™ Socket-A

IA,
IB,
I

BUS

The block diagram of the dsPIC33CK Low-Voltage Motor Control Board is shown in

Figure 1-2. For more information on electrical specifications, refer to

Appendix B. “Electrical Specifications”.

FIGURE 1-2: THE MOTOR CONTROL BOARD BLOCK DIAGRAM

Introduction

Quadrature Encoder

Feedbacks

Speed/

EXT

TEMP

External

Interface

Hall Sensor Feedbacks

Three-Phase Inverter Bridge

J14

Connector

dsPIC33CK256MP508

V
V
V

es

Phase

Volta

MCP6024

Phase

PWMs

MCP651S

V

MOSFET Temperature

Three-Phase Inverter

Phase

Shunts

Bus

J2

Connector

MCP9700

CAN FD

PMP

WDT

SENT

DMT

UART

DMA

CRC

e

ut DC Volta
In

SPI

I2C

Other Interfaces

MCP2200

USB to UART Converter

+12V +5V

+12V Output

ICSP™

Debug

Auxiliary Power Supply

+5V Output

J1

Connector

12-24 VDC, 2.5A

User Interface

+3.3 VA

Program/

+3.3V

 2020 Microchip Technology Inc. DS50002927A-page 11

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

NOTES:

DS50002927A-page 12  2020 Microchip Technology Inc.

Chapter 2. Board Interface Description

2.1 INTRODUCTION

This chapter provides a more detailed description of the input and output interfaces of the
dsPIC33CK Low-Voltage Motor Control Board. This chapter covers the following topics:

• Board Connectors

• User Interface Hardware

• Pin Functions of the dsPIC DSC

2.2 BOARD CONNECTORS

This section summarizes the connectors on the Motor Control Board. The connectors
are intended for:

• Supplying input power to the Motor Control Board

• Delivering inverter outputs to the motor

• Interfacing motor position sensors, such as Hall sensors or the Quadrature
Encoder

• Enabling the user to program/debug the dsPIC33CK256MP508 device

• Interfacing the Click Boards™

• Establishing communication with the host PC

• Interfacing the external temperature sensor (thermistor)

The connectors on the Motor Control Board are shown in Figure 2-1 and summarized
in Ta b le 2 -1 .

dsPIC33CK LOW-VOLTAGE

MOTOR CONTROL BOARD

USER’S GUIDE

 2020 Microchip Technology Inc. DS50002927A-page 13

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

J13

J10

J6

J3

J4

J11

J12

J9

J7

J8

J14

J16

J1

J2

FIGURE 2-1: CONNECTORS – dsPIC33CK LOW-VOLTAGE MOTOR CONTROL BOARD

TABLE 2-1: MOTOR CONTROL BOARD CONNECTORS

Connector

Designator

J1 3 Populated Input DC power supply jack

J2 2 Populated Input DC power supply – two-pin terminal connector (5 mm pitch,12-30 AWG wire insert)

J3 6 Not Populated UART interface connections

J4 2 Not Populated Erase jumper – used to switch PICkit™ On-Board (PKOB)

J6 5 Populated USB Micro-B connector for establishing the serial interface with the host PC

J7 6 Populated Hall sensor interface terminal connector (2.54 mm pitch, 20-30 AWG wire insert)

J8 6 Populated Quadrature Encoder Interface terminal connector (2.54 mm pitch,

J9 2 Not Populated External temperature sensor (thermistor) interface connector (2.5 mm pitch)

J10 6 Not Populated ICSP™ header – interfacing programming/debugging the dsPIC® DSC

J11 16 Populated mikroBUS™ socket for interfacing a Click Board™ with the Motor Control Board,

J12 16 Populated mikroBUS socket for interfacing a Click Board with the Motor Control Board, labeled

J13 5 Populated PICkit On-Board (PKOB) programmer/debugger interface connector (standard

J14 3 Populated Three-phase inverter output for connecting motor (5 mm pitch,

J16 2 Not Populated Jumper (2.54 mm pitch) which may be optionally used to connect the positive supply

No. of

Pins

Status Description

programmer/debugger to Boot Recovery mode through MPLAB

20-30 AWG wire insert)

labeled as ‘A’ on the board

as ‘B’ on the board

female USB Micro-B connector)

12-30 AWG wire insert)

DC

) input of connectors, J1 and J2; shorted by default on the board using PCB trace

(V

®

X IDE

DS50002927A-page 14  2020 Microchip Technology Inc.

Board Interface Description

Auxiliary Power Supply

Three-Phase Inverter

VDC

NT1

Net Tie

J16

Jumper

Populated by Default

J2

J1

PGND

24A

2.5A

PGND

dsPIC33CK Low-Voltage Motor Control Board

Note 1: The Motor Control Board is designed to operate at a DC voltage range of 12V to 48V. When

powering the board through J1, limit the voltage to 24V Max. When the applied voltage is greater
than 24V, always use connector J2 to power the board.

2: When J1 and J2 are shorted through either J16 or NT1, always power the Motor Control Board

using only one connector, either J1 or J2.

2.2.1 Power Supply Connectors (J1, J2, J16)

The board is designed to operate in the DC voltage range of 12-48V. As shown in

Figure 2-2, the Motor Control Board can be powered through either coaxial plug J1 or

through terminal connector J2.

FIGURE 2-2: INPUT DC POWER SUPPLY CONNECTORS

(1,2)

If required, the power to the inverter can be disconnected by cutting the trace of the net
tie, NT1, and the rest of the circuitry can be powered through the supply connected to
the coaxial plug J1. The connection between the net tie can be bridged back by popu­lating jumper J16, restoring the connection between J1 and J2, such that either input
connector, J1 or J2, can be used for powering the Motor Control Board. Connector J1
can carry current up to 2.5A and connector J2 can handle up to 24A. Ta bl e 2 -2 and

Ta bl e 2 -3 summarize the pin assignments of connectors, J1 and J2, respectively.

TABLE 2-2: PIN DESCRIPTION – CONNECTOR J1

Pin # Signal Name Pin Description

1VDC DC Input Supply Positive

2 PGND DC Input Supply Negative or PGND

3 PGND DC Input Supply Negative or PGND

Pin # Signal Name Pin Description

1 PGND DC Input Supply Negative or PGND

2VDC DC Input Supply Positive

TABLE 2-3: PIN DESCRIPTION – CONNECTOR J2

 2020 Microchip Technology Inc. DS50002927A-page 15

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

2.2.2 UART Interface Header (J3)

A 5-pin header, J3, is a UART interface provided to connect an external UART-USB
converter or for accessing UART signals by disabling the MCP2200 device (see U13
in Figure A-5). Ta bl e 2 -4 summarizes the pin functions of connector J3.

TABLE 2-4: PIN DESCRIPTION – CONNECTOR J3

Pin # Signal Name Pin Description

1 +3.3V +3.3V Supply

2 DEBUG_TX UART Transmit Pin of dsPIC® DSC

3 DEBUG_RX UART Receive Pin of dsPIC DSC

4 DGND Digital Ground

5 MCP2200_RST Setting this Pin Low (connecting to Ground) will

Disable the MCP2200 (U13)

2.2.3 USB Serial Interface (J6)

The Motor Control Board uses an on-board MCP2200 device (see U13 in Figure A-5)
as a bridge between the UART and USB (see Table 2-5) for providing the host PC
interface.

TABLE 2-5: PIN DESCRIPTION – CONNECTOR J6

Pin # Signal Name Pin Description

0 No Connection Body is Connected to Digital Ground

1 5V_USB USB +5 V

2 UART_USB_N USB Data-

3 UART_USB_P USB Data+

4 No Connection —

5 GND Digital Ground

DC

2.2.4 Hall Sensor Interface Connector (J7)

Hall sensors are used to detect the rotor position and speed of the motor. Connector
J7 can be used to interface the Hall sensor outputs with the Motor Control Board,
enabling sensor-based BLDC motor control applications. Table 2-6 shows the pin
descriptions of connector J7. The connector provides two supply outputs, +5V and
+3.3V, which can be used as input supplies of the Hall sensors based on the sensor
specification.

TABLE 2-6: PIN DESCRIPTION – CONNECTOR J7

Pin # Signal Name Pin Description

1 +5V +5V Supply to Hall Sensors

2 +3.3V +3.3V Supply to Hall Sensors

3 DGND Digital Ground

4 HA Hall Sensor A Feedback from the Motor

5 HB Hall Sensor B Feedback from the Motor

6 HC Hall Sensor C Feedback from the Motor

DS50002927A-page 16  2020 Microchip Technology Inc.

Board Interface Description

2.2.5 Quadrature Encoder Interface Connector (J8)

Quadrature Encoders are used to detect the rotor position and speed of the motor.
Connector J8 can be used to interface the encoder outputs with the Motor Control
Board, enabling sensor-based BLDC/PMSM motor control applications. Ta b le 2 -7
shows the pin description of connector J8. The connector provides two supply outputs,
+5V and +3.3V, which can be used as input supplies to the Quadrature Encoder based
on the encoder specification.

TABLE 2-7: PIN DESCRIPTION – CONNECTOR J8

Pin # Signal Name Pin Description

1 +5V +5V Supply to Quadrature Encoder

2 +3.3V +3.3V Supply to Quadrature Encoder

3 DGND Digital Ground

4 QEA Quadrature Encoder Phase A Feedback of the Motor

5 QEB Quadrature Encoder Phase B Feedback of the Motor

6 INDX Quadrature Encoder INDEX Feedback of the Motor

2.2.6 External Temperature Sensor Interface Connector (J9)

The 2-pin connector (2.5 mm pitch) J9 can be used for interfacing a thermistor to the
board. This is not populated by default. When needed, populate the connector with
Part Number B2B-EH-A(LF)(SN) or similar.

2.2.7 ICSP™ Header for Programmer/Debugger Interface (J10)

The 6-pin header J10 can be used for connecting the programmer/debugger, for
example, PICkit™ 3, for programming and debugging the dsPIC33CK256MP508.
This is not populated by default. When needed, populate the connector with
Part Number 68016-106HLF or similar. The pin details are provided in Table 2-8.

TABLE 2-8: PIN DESCRIPTION – CONNECTOR J10

Pin # Signal Name Pin Description

1MCLR

2DVDD Digital Supply Voltage

3 DGND Digital Ground

4 PGD Device Programming Data Line (PGD)

5 PGC Device Programming Clock Line (PGC)

6 No Connection —

Device Master Clear (MCLR)

 2020 Microchip Technology Inc. DS50002927A-page 17

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

2.2.8 mikroBUS™ Sockets for Interfacing a Click Board™ (J11, J12)

Two mikroBUS sockets are provided on the Motor Control Board which can be used to
expand the functionality by attaching an add-on board, called a ‘Click Board’. The
mikroBUS sockets, J11 and J12, are labeled as ‘A’ and ‘B’, respectively. The
Motor Control Board implements the mikroBUS socket pinouts, as specified in the
“mikroBUS™ Standard Specifications v2.0” (refer to www.mikroe.com/mikrobus).

The pinout consists of three groups of communication pins (SPI, UART and I
additional pins (PWM, interrupt, analog input, Reset and chip select) and two power
groups (+3.3V-GND and 5V-GND).

For pin mapping information between the dsPIC DSC and the mikroBUS sockets, refer
to the schematics in Section A.1 “Board Schematics and Layout” or

Section 2.4 “Pin Functions of the dsPIC DSC”.

2.2.9 USB Connector for PKOB Interface (J13)

This is a standard female USB Micro-B connector that provides USB communication
when interfacing with the PICkit On-Board (PKOB) programming/debugging tool. Pin
assignments for connector J13 are shown in Ta bl e 2 -9 .

TABLE 2-9: PIN DESCRIPTION – CONNECTOR J13

Pin # Signal Name Pin Description

2

C), six

0 No Connection Body is Connected to GND

1VBUS USB 5V

2 D_N USB Data-

3 D_P USB Data+

4 No Connection —

5 GND PKOB Ground (GND)

2.2.10 Inverter Output Connector (J14)

The Motor Control Board can drive a three-phase PMSM/BLDC motor. Motor control
inverter outputs are available on connector J14. Pin assignments for connector J14 are
shown in Ta b le 2 - 10 .

TABLE 2-10: PIN DESCRIPTION – CONNECTOR J14

Pin # Signal Name Pin Description

1 PHASE C Phase 3 Output of Inverter

2 PHASE B Phase 2 Output of Inverter

3 PHASE A Phase 1 Output of Inverter

DS50002927A-page 18  2020 Microchip Technology Inc.

Board Interface Description

LD1
LD2

LD3

LD11

LD10

LD4

LD5

LD7

LD6

LD9

LD8

2.3 USER INTERFACE HARDWARE

This section describes the LEDs, push buttons, potentiometer and test points available
on the Motor Control Board.

2.3.1 LEDs

The LEDs provided on the Motor Control Board are shown in Figure 2-3 and
summarized in Tab le 2- 11.

FIGURE 2-3: LEDs – dsPIC33CK LOW-VOLTAGE MOTOR CONTROL BOARD

TABLE 2-11: LEDs

LED

Designator

LD1 Yellow USB receive LED activity output. Refer to the “MCP2200 Data Sheet” for more details.

LD2 Green USB transmit LED activity output. Refer to the “MCP2200 Data Sheet” for more details.

LD3 Red Power-on status indication, connected to auxiliary supply output: +3.3V.

LD4 Green Indicates PWM1H (PWM_AH), used for controlling top MOSFET of the inverter Half-Bridge A.

LD5 Green Indicates PWM1L (PWM_AL), used for controlling bottom MOSFET of the inverter Half-Bridge A.

LD6 Green Indicates PWM2H (PWM_BH), used for controlling top MOSFET of the inverter Half-Bridge B.

LD7 Green Indicates PWM2L (PWM_BL), used for controlling bottom MOSFET of the inverter Half-Bridge B.

LD8 Green Indicates PWM4H (PWM_CH), used for controlling top MOSFET of the inverter Half-Bridge C.

LD9 Green Indicates PWM4L (PWM_CL), used for controlling bottom MOSFET of the inverter Half-Bridge C.

LD10 Yellow User-defined LED provided for debugging purposes (LED1).

LD11 Yellow User-defined LED provided for debugging purposes (LED2).

 2020 Microchip Technology Inc. DS50002927A-page 19

LED

Color

LED Indication

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

SW1 SW2 SW3

SW4

MCLR

2.3.2 Push Buttons

The push buttons provided on the Motor Control Board are shown in Figure 2-4 and
summarized in Tab le 2- 12.

The push buttons, SW1, SW2 and SW3, are provided to control motor operations; for
example, starting or stopping the motor. The functions of these push buttons are
defined by the motor control application firmware.

FIGURE 2-4: PUSH BUTTONS – dsPIC33CK LOW-VOLTAGE MOTOR CONTROL BOARD

TABLE 2-12: PUSH BUTTONS

SI #

1 SW1 Push button provided for general purpose (BUTTON1).

2 SW2 Push button provided for general purpose (BUTTON2).

3 SW3 Push button provided for general purpose (BUTTON3).

4 SW4 This push button is tied to the MCLR

DS50002927A-page 20  2020 Microchip Technology Inc.

Push Button

Designator

will reset the dsPIC

®

DSC.

LED Indication

pin of the dsPIC33CK256MP508. Pressing this button

Board Interface Description

POT1

2.3.3 Potentiometer

The potentiometer on the Motor Control Board (shown in Figure 2-5) is connected to
one of the analog inputs of the device and can be used for setting the speed reference.

FIGURE 2-5: POTENTIOMETER – dsPIC33CK LOW-VOLTAGE MOTOR CONTROL BOARD

 2020 Microchip Technology Inc. DS50002927A-page 21

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

DGND

+12V

+5V

PGND

VDC

PGND

+3.3 VA

+3.3V

DGND

IBUS_EXT

IBUS_FILT_EXT

AGND

VBUS

IBUS

TP12

TP11

VB

VA

VC

IB_EXT

IA_EXT

IA

TP14

AGND

AL

AH

BH

BL

CH

CL

DGND

TP21

HALL_A

HALL_B

HALL_C

QEI_A

QEI_B

QEI_INDEX

QEI_HOME

HOME

DGND

LED1

LED2

IC_EXT

VREF

TP13

IB

2.3.4 Test Points

There are several test points on the Motor Control Board to monitor various signals,
such as motor feedback voltages, motor currents, auxiliary supply outputs, etc. These
test points are marked in Figure 2-6 and summarized in Table 2-13.

FIGURE 2-6: TEST POINTS – dsPIC33CK LOW-VOLTAGE MOTOR CONTROL BOARD

DS50002927A-page 22  2020 Microchip Technology Inc.

Board Interface Description

TABLE 2-13: BOARD TEST POINTS

Test Point # Signal Description

Power Supply Inputs and Outputs

TP1 VDC Input DC Power Supply

TP3 +12V +12V Supply – output of on-board MIC28511 device-based

buck converter

TP7 PGND Power Ground

TP22 PGND Power Ground

TP4 +5V +5V Supply – output of on-board MCP16301 device-based buck converter

TP5 +3.3V +3.3V Digital Supply – output of on-board +3.3V LDO (MCP1826)

TP8 DGND Digital Ground

TP18 DGND Digital Ground

TP19 DGND Digital Ground

TP6 +3.3VA +3.3V Analog Supply

TP9 AGND Analog Ground

TP20 AGND Analog Ground

Analog Signals

TP17 V

IA IA Internal Amplifier (dsPIC33CK256MP508 Op Amp 1) output of Phase A leg

IA_EXT IA_EXT External Amplifier (MCP6024 U5A) output of Phase A leg current feedback of

IB IB Internal Amplifier (dsPIC33CK256MP508 Op Amp 2) output of Phase B leg

IB_EXT IB_EXT External Amplifier (MCP6024 U5B) output of Phase A leg current feedback of

IC_EXT IC_EXT External Amplifier (MCP6024 U5C) output of Phase A leg current feedback of

BUS IBUS Internal Amplifier (dsPIC33CK256MP508 Op Amp 3) output of bus current

I

IBUS_EXT IBUS_EXT External Amplifier (U15 MCP651S) output of bus current feedback of inverter

IBUS_FILT_EXT IBUS_FILT_EXT Filtered Bus Current Feedback of Inverter, which is amplified by MCP651S

VA VA Phase A Voltage Feedback

VB VB Phase B Voltage Feedback

VC VC Phase C Voltage Feedback

BUS VBUS DC Bus Voltage Feedback

V

TP14 TEMP_LOCAL MOSFET Temperature – output of on-board temperature sensor, MCP9700 (U14)

TP21 TEMP_EXT Output of External Temperature Sensor interfaced through connector J9

REF +1.65V Voltage Reference to bias op amp outputs

current feedback of inverter

inverter

current feedback of inverter

inverter

inverter

feedback of inverter

(U15); this output is connected to the negative input of one of the internal
comparators of dsPIC33CK256MP508 (U9) for overcurrent protection

 2020 Microchip Technology Inc. DS50002927A-page 23

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

TABLE 2-13: BOARD TEST POINTS (CONTINUED)

Test Point # Signal Description

PWM Outputs

J15-1 AL PWM1L Output from dsPIC® DSC, which controls bottom MOSFET of the

Inverter Half-Bridge A

J15-2 AH PWM1H Output from dsPIC

Half-Bridge A

J15-3 BL PWM2L Output from dsPIC DSC, which controls bottom MOSFET of the

Inverter Half-Bridge B

J15-4 BH PWM2H Output from dsPIC DSC, which controls top MOSFET of the Inverter

Half-Bridge B

J15-5 CL PWM4L Output from dsPIC DSC, which controls bottom MOSFET of the

Inverter Half-Bridge C

J15-6 CH PWM4L Output from dsPIC DSC, which controls top MOSFET of the Inverter

Half-Bridge C

Hall Sensor Feedbacks

HALL_A HALL_A Hall Sensor A Feedback connected to dsPIC DSC input

HALL_B HALL_B Hall Sensor B Feedback connected to dsPIC DSC input

HALL_C HALL_C Hall Sensor C Feedback connected to dsPIC DSC input

Quadrature Encoder Feedbacks

QEI_A QEI_A Quadrature Encoder A Feedback connected to dsPIC DSC input

QEI_B QEI_B Quadrature Encoder B Feedback connected to dsPIC DSC input

QEI_INDEX QEI_INDEX Quadrature Encoder INDEX Feedback connected to dsPIC DSC input

QEI_HOME QEI_HOME Quadrature Encoder HOME Feedback connected to dsPIC DSC input

HOME HOME This test point can be optionally used to interface the HOME signal feedback

with the Motor Control Board

LEDs and General Purpose I/Os

LED1 LED1 LED1 Output from dsPIC

LED2 LED2 LED2 Output from dsPIC DSC

TP11 TP11 Connected to the port pin RE4 of the dsPIC DSC; this test point can be

optionally used as a general purpose input or output

TP12 TP12 Connected to the port pin RE5 of the dsPIC DSC; this test point can be

optionally used as a general purpose input or output

TP13 TP13 Connected to the port pin RE15 of the dsPIC DSC; this test point can be

optionally used as a general purpose input or output

DSC, which controls top MOSFET of the Inverter

®

DSC

DS50002927A-page 24  2020 Microchip Technology Inc.

2.4 PIN FUNCTIONS OF THE dsPIC DSC

The on-board dsPIC33CK256MP508 device (see U9 in Figure A-2) enables the control
of various features of the Motor Control Board through its peripherals and CPU
capability. Pin functions of the dsPIC DSC are grouped according to their functionality
and presented in Ta bl e 2- 14 .

Board Interface Description

TABLE 2-14: dsPIC

Signal

dsPIC DSC Configuration – Supply, Reset, Clock and Programming

+3.3V 12, 31, 51, 71 V

DGND 11, 32, 50, 70 V

+3 .3VA 25 AV

AGND 26 AV

OSCI 34 OSCI/CLKI/AN5/RP32/

OSCO 35 OSCO/CLKO/AN6/RP33/

MCLR

PGD 55 PGD3/RP37/SDA2/PMA14/

PGC 56 PGC3/RP38/SCL2/RB6

dsPIC DSC Internal Amplifier Connections for Current Amplification

SHUNT_IA_P 20 OA1IN+/AN9/PMA6/RA2 Operational

SHUNT_IA_N 18 OA1IN-/ANA1/RA1

IA 16 OA1OUT/AN0/CMP1A/

SHUNT_IB_P 45 PGC2/OA2IN+/RP36/RB4 Operational

SHUNT_IB_N 43 PGD2/OA2IN-/AN8/RP35/

IB 41 OA2OUT/AN1/AN7/ANA0/

SHUNT_IBUS_P 29 OA3IN+/AN14/CMP2B/

SHUNT_IBUS_N 28 OA3IN-/AN13/CMP1B/

I

BUS

dsPIC® DSC

9MCLR Reset Connects to a push button (SW4), ICSP™

23 OA3OUT/AN4/CMP3B/

®

DSC PIN FUNCTIONS

Pin #

dsPIC DSC Pin Function

DD

SS

DD

SS

PMD10/PMA10/RB0

PMA1/PMALH/PSA1/RB1

PMCS1/PSCS/RB5

IBIAS0/RA0

RB3

CMP1D/CMP2D/CMP3D/
RP34/SCL3/INT0/RB2

ISRC1/RP50/PMD13/
PMA13/RC2

ISRC0/RP49/PMA7/RC1

IBIAS3/RA4

dsPIC DSC

Peripheral

Supply +3.3V digital supply to dsPIC DSC

Oscillator with PLL Connects to crystal (X2) on the board

In-Circuit Serial
Programming™
(ICSP™) or
In-Circuit Debugger

Amplifier 1
(Op Amp #1) and
Dedicated ADC
Core #0

Amplifier 2
(Op Amp #2) and
Dedicated ADC
Core #1

Operational
Amplifier 3
(Op Amp #3) and
Shared ADC Core

Remarks

Digital ground

+3.3V analog supply to dsPIC DSC

Analog Ground

header (J10) and PKOB circuit

Connects to ICSP header (J10) and
PKOB programming/debugging tool

Differential current feedback from shunt
resistor Rsh1 connects to noninverting and
inverting inputs of Op Amp #1 through input
resistors

Op Amp #1 output, which is amplified Phase A
current. For the output to be available, config­ure and enable Op Amp #1, populate the
resistor R125 (0R) in the amplifier feedback
and remove R121 if populated

Differential current feedback from shunt
resistor Rsh2 connects to noninverting and
inverting inputs of Op Amp #2 through input
resistors

Op Amp #2 output, which is amplified Phase B
current. For the output to be available, config­ure and enable Op Amp #2, populate the
resistor R133 (0R) in the amplifier feedback
and remove R129 if populated

Differential current feedback from shunt
resistor Rsh4 connects to noninverting and
inverting inputs of Op Amp #3 through input
resistors

Op Amp #3 output, which is amplified bus
current. For the output to be available, config­ure and enable Op Amp #3, populate the
resistor R141 (0R) in the amplifier feedback
and remove R137 if populated

 2020 Microchip Technology Inc. DS50002927A-page 25

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

TABLE 2-14: dsPIC® DSC PIN FUNCTIONS (CONTINUED)

Signal

Amplified Currents from External Amplifiers: U5 and U15

IA_EXT 16 OA1OUT/AN0/CMP1A/

IB_EXT 41 OA2OUT/AN1/AN7/ANA0/

IBUS_EXT 23 OA3OUT/AN4/CMP3B/

Overcurrent Detection and Fault Output

IBUS_FILT_EXT 21 DACOUT1/AN3/CMP1C/RA3 High-Speed Analog

Voltage Feedbacks

V_BUS 33 AN15/CMP2A/IBIAS2/RP51/

V_A 30 AN17/ANN1/IBIAS1/RP54/

V_B 19 AN23/RE3 Shared ADC Core Phase B voltage feedback

V_C 17 AN22/RE2 Shared ADC Core Phase C voltage feedback

Temperature Feedbacks and Potentiometer (POT #1 – Speed Reference)

TEMP_LOCAL 15 AN12/ANN0/RP48/RC0 Shared ADC Core MOSFET die temperature sensed by

TEMP_EXT 58 TDO/AN2/CMP3A/RP39/

SPEED_
REFERENCE

Hall Sensor Feedbacks (Interfaced via Connector J7)

HALL_A 42 RE8 I/O Ports and

HALL_B 44 RE9

HALL_C 57 RE10

Quadrature Encoder Feedbacks (Interfaced via Connector J8)

QEI_A 5 RP60/PWM8H/PMD7/RC12 Remappable

QEI_B 6 RP61/PWM8L/PMA5/RC13

QEI_INDEX 7 RP62/PWM6H/PMA4/RC14

QEI_HOME 8 RP63/PWM6L/PMA3/RC15

Debug Interface (J6, J5 or PKOB)

DEBUG_RX 13 RP78/PCI21/RD14 Remappable

DEBUG_TX 14 ANN2/RP77/RD13

dsPIC® DSC

Pin #

61 PGC1/AN11/RP41/SDA1/RB9 Shared ADC Core Potentiometer (POT1) can be used for setting

dsPIC DSC Pin Function

IBIAS0/RA0

CMP1D/CMP2D/CMP3D/
RP34/SCL3/INT0/RB2

IBIAS3/RA4

PMD11/PMA11/RC3

PMD12/PMA12/RC6

SDA3/RB7

dsPIC DSC

Peripheral

Dedicated ADC
Core #0

Dedicated ADC
Core #1

Shared ADC Core Bus current amplified by the amplifier U15;

Comparator #1
(CMP #1) and
DAC #1

Shared ADC Core DC bus voltage feedback

Shared ADC Core Phase A voltage feedback

Shared ADC Core Feedback from external temperature sensor

Change
Notification (CN)

feature of I/O and
QEI

function of I/O and
UART

Phase Current A amplified by the amplifier
U5-A; when using this output, populate the
resistor R121 (0R), remove the resistor R125 if
populated and disable dsPIC DSC Operational
Amplifier #1

Phase Current B amplified by the amplifier
U5-B; when using this output, populate the
resistor R129 (0R), remove the resistor R133,
if populated and disable dsPIC DSC
Operational Amplifier #2

when using this output, populate the resistor
R137 (0R), remove the resistor R141, if popu­lated and disable dsPIC DSC Operational
Amplifier #3

Amplified bus current is further filtered prior to
connecting to the positive input of the CMP #1
used for overcurrent detection. Overcurrent
threshold can be set through DAC. Comparator
output is internally available as Fault input of the
PWM Generators so that it can be used for
shutting down PWMs without CPU intervention.

MCP9700 (U14) can be used for thermal
protection

interfaced via connector J9

the speed reference in motor control application

Change Notification interrupt can be enabled
to identify the transitions of any of the Hall
sensor inputs

QEI module can be configured to read position
or speed information based on the encoder
signals as required by the motor control
application

These signals are connected to MCP2200
(U13), header J5 and PKOB; connect and
disconnect appropriate jumper resistors to
establish serial communication via any of
these channels

Remarks

DS50002927A-page 26  2020 Microchip Technology Inc.

Board Interface Description

TABLE 2-14: dsPIC® DSC PIN FUNCTIONS (CONTINUED)

Signal

PWMs for Controlling Three-Phase Inverter (Q1 to Q6)

PWM_AH 1 RP46/PWM1H/PMD5/RB14 PWM Generator #1 Controls top MOSFET Q1 of the Inverter

PWM_AL 3 RP47/PWM1L/PMD6/RB15 Controls bottom MOSFET Q2 of the Inverter

PWM_BH 78 TDI/RP44/PWM2H/PMD3/

PWM_BL 80 RP45/PWM2L/PMD4/RB13 Controls bottom MOSFET Q4 of the Inverter

PWM_CH 73 RP65/PWM4H/RD1 PWM Generator #4 Controls top MOSFET Q5 of the Inverter

PWM_CL 74 RP64/PWM4L/PMD0/RD0 Controls bottom MOSFET Q6 of the Inverter

User Interface (LEDs, Push Buttons, General Purpose I/Os)

LED1 37 RE6 I/O Ports Connected to general purpose LED LD10

LED2 39 RE7 Connected to general purpose LED LD11

BUTTON1 59 RE11 Connected to push button SW1

BUTTON2 62 RE12 Connected to push button SW2

BUTTON3 64 RE13 Connected to push button SW3

TP11 22 RE4 Test point TP11 can be optionally used as a

TP12 24 RE5 Test point TP12 can be optionally used as a

TP13 79 RE15 Test point TP13 can be optionally used as a

Click Board™ Socket A Signals (J11)

CLICK_AN_A 4 AN21/RE1 Analog Channel or

CLICK_RST_A 77 RE14 GPIO

CLICK_CS_A 75 TMS/RP42/PWM3H/PMD1/

CLICK_SCK_A 27 RP76/RD12 Can be configured

CLICK_MISO_A 38 AN18/CMP3C/ISRC3/RP74/

CLICK_MOSI_A 36 AN19/CMP2C/RP75/PMA0/

CLICK_SDA_A 68 RP68/ASDA3/RD4 Alternate I

CLICK_SCL_A 69 RP67/ASCL3/RD3

CLICK_TX_A 40 AN16/ISRC2/RP55/PMD8/

CLICK_RX_A 52 RP71/PMD15/RD7

CLICK_INT_A 10 RP79/PCI22/PMA2/RD15 Can be configured

CLICK_PWM_A 76 TCK/RP43/PWM3L/PMD2/

dsPIC® DSC

Pin #

dsPIC DSC Pin Function

RB12

RB10

PMD9/PMA9/RD10

PMALL/PSA0/RD11

PMA8/RC7

RB11

dsPIC DSC

Peripheral

Phase A

Phase A

PWM Generator #2 Controls top MOSFET Q3 of the Inverter

GPIO

Remappable Pin or
PWM or GPIO

as SPI Input/
Output or Clock
through
Remappable
Feature

and Clock Pins of

2

I

C #3

Can be configured
as UART RX and
TX through
Remappable
Feature

as Interrupt Pin
through
Remappable
Feature

Can be configured
as SCCP Input or
Output or use PWM
Generator Output

2

C Data

Phase B

Phase B

Phase C

Phase C

general purpose input or output

general purpose input or output

general purpose input or output

Click Board socket is provided to extend the
feature by interfacing appropriated Click
Boards.
Pin feature requirement changes are based on
the Click Board inserted in the socket; the
signals are allocated as per the general
requirements.

Remarks

 2020 Microchip Technology Inc. DS50002927A-page 27

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

TABLE 2-14: dsPIC® DSC PIN FUNCTIONS (CONTINUED)

Signal

Click Board™ Socket B Signals (J12)

CLICK_AN_B 2 AN20/RE0 Analog Input or

CLICK_RST_B 72 RP66/RD2 Remappable Pin or

CLICK_CS_B 48 RP73/PCI20/RD9 Remappable Pin or

CLICK_SCK_B 46 RP56/ASDA1/SCK2/RC8 Dedicated SPI #2

CLICK_MISO_B 49 RP72/SDO2/PCI19/RD8

CLICK_MOSI_B 47 RP57/ASCL1/SDI2/RC9

CLICK_SDA_B 63 RP52/PWM5H/ASDA2/RC4 Alternate I

CLICK_SCL_B 65 RP53/PWM5L/ASCL2/

CLICK_TX_B 54 RP69/PMA15/PMCS2/RD5 Can be configured

CLICK_RX_B 53 RP70/PMD14/RD6

CLICK_INT_B 67 RP59/PWM7L/RC11 Can be configured

CLICK_PWM_B 66 RP58/PWM7H/PMRD/

dsPIC® DSC

Pin #

dsPIC DSC Pin Function

PMWR/PMENB/PSWR/RC5

PMWR/PSRD/RC10

dsPIC DSC

Peripheral

GPIO

GPIO

PWM or GPIO

Pins

2

and Clock Pins of

2

I

C #2

as UART RX and
TX through
Remappable
Feature

as Interrupt Pin
through
Remappable
Feature

Can be configured
as SCCP Input or
Output or use as
PWM Generator
Output

C Data

Remarks

Click Board socket is provided to extend the
feature by interfacing appropriated Click
Boards.
Pin feature requirement changes based on the
Click Board inserted in the socket; the signals
are allocated as per the Click Board signal
generic requirements.

DS50002927A-page 28  2020 Microchip Technology Inc.

Chapter 3. Hardware Description

3.1 INTRODUCTION

This chapter provides a detailed description of the hardware features of the
dsPIC33CK Low-Voltage Motor Control Board. The Motor Control Board is intended to
demonstrate the capability of the dsPIC33CK family of single core Digital Signal
Controllers (DSCs) for motor control applications.

The motor control inverter on the Motor Control Board is controlled by the highest pin
count variant dsPIC33CK256MP508 device from the dsPIC33CK family. The Motor
Control Board incorporates a Hall sensor/Quadrature Encoder Interface (QEI), and
sensing circuits to measure DC voltage, phase voltages, bus current and phase
currents, etc. In addition, a USB-UART interface, mikroBUS™ sockets and a PICkit™
On-Board (PKOB) programmer/debugger circuit are provided.

The motor control inverter can be operated by using an input voltage in the range of
12V to 48V and can deliver a continuous output phase current of 10A (RMS) in the
specified operating range. For more information on electrical specifications, see

Appendix B. “Electrical Specifications”.

dsPIC33CK LOW-VOLTAGE

MOTOR CONTROL BOARD

USER’S GUIDE

3.2 HARDWARE SECTIONS

This chapter covers the following hardware sections of the dsPIC33CK Low-Voltage
Motor Control Board:

• dsPIC33CK256MP508 and Auxiliary Circuits

• Power Supply

• Three-Phase Inverter Bridge

• Current Sensing Circuits

• Voltage Sensing Circuit

• Hall Sensor/Quadrature Encoder Interface

• External Temperature Sensor Interface

• User Interface

• Debug Serial UART Interface

• mikroBUS™ Sockets

• Programmer/Debugger Interface

Figure 3-1 and Ta b le 3 -1 describe the hardware sections of the Motor Control Board.

 2020 Microchip Technology Inc. DS50002927A-page 29

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

1

11

9

8

10

4

4

1

8

4

4

3

6

7

2

5

FIGURE 3-1: HARDWARE SECTIONS

TABLE 3-1: HARDWARE SECTIONS

Section No. Hardware Sections

1 dsPIC33CK256MP508 and Auxiliary Circuits

2 Power Supply

3 Three-Phase Inverter Bridge

4 Current Sensing Circuits

5 Voltage Sensing Circuit

6 Hall Sensor/Quadrature Encoder Interface

7 External Temperature Sensor Interface

8 User Interface

9 Debug Serial UART Interface

10 mikroBUS™ Sockets

11 Programmer/Debugger Interface

DS50002927A-page 30  2020 Microchip Technology Inc.

Hardware Description

3.2.1 dsPIC33CK256MP508 and Auxiliary Circuits

The dsPIC33CK Low-Voltage Motor Control Board features the dsPIC33CK256MP508
from Microchip’s dsPIC

®

DSC portfolio. dsPIC33C family devices implement a
100 MIPS high-performance dsPIC DSC core, and also integrate analog peripherals,
such as high-speed ADCs, op amps and analog comparators. The device also imple­ments up to 16-channel, high-resolution Pulse-Width Modulators (PWMs) with built-in
Fault protection, triggering and synchronization features, which makes this dsPIC
device an ideal platform for the development of time-critical PMSM/BLDC motor control
applications.

The high-resolution PWM module in the dsPIC33C can generate, at specific instances,
multiple ADC triggers for measuring motor currents, phase voltages, inverter input volt­age, total bus inverter current, etc. These feedbacks are required for implementing
motor control algorithms, such as sensor or sensorless Field-Oriented Control (FOC),
torque control, trapezoidal control, initial position detection, wind milling, flux
weakening and single-shunt current reconstruction. The PWM Control Input (PCI) of
the PWM module can be used for shutting down PWM outputs immediately when a
Fault is detected and synchronizing multiple PWM Generators (PGs) used for
controlling the three-phase inverter bridge.

The comparator module, along with the Digital-to-Analog Converter (DAC), can be
used for detecting overcurrent or overtemperature Faults to protect the inverter or
motor in case of malfunction. The dsPIC DSC has three operational amplifiers. These
can be configured by connecting an external input and feedback resistors for amplifying
currents sensed by shunt resistors.

The Change Notification (CN) feature of the I/O ports, along with the timer, can be used
for detection of Hall sensor state changes to obtain position and speed of the motor in
sensor-based BLDC motor control applications. Similarly, the Quadrature Encoder
Interface (QEI) in the dsPIC DSC can be configured to obtain the position/speed
information from the Quadrature Encoder feedbacks of the motor, which are required
for sensor-based Field-Oriented Control of PMSMs.

The dsPIC DSC also integrates several communication peripherals, such as CAN FD,
SENT, SPI, I

2

C and UART for communicating with the host PC, central controller or
master controller. Additionally, it features a Watchdog Timer, Deadman Timer, ECC
engine and BIST module required for safety-critical applications.

In the Motor Control Board, a provision is provided to mount an external crystal
oscillator to use its output as the dsPIC DSC clock input. Push button SW4 is tied to
the MCLR

pin of the device and is provided to reset the dsPIC DSC. One of the
program/debug pin pairs, PGC3/PGD3, of the dsPIC device is connected to the
programmer/debugger interfaces provided on the Motor Control Board, along with
MCLR

, to allow programming/debugging of the dsPIC33CK256MP508. Decoupling
capacitors are provided on all the power supply pins of the dsPIC DSC, including the
V

DD/GND and AVDD/AGND pairs.

 2020 Microchip Technology Inc. DS50002927A-page 31

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

DC-DC

Converter

(MIC28511)

DC-DC

Converter

(MCP16301)

+3.3V Output

LDO

(MCP1826)

+5V

Input Terminal

Input Jack

MIC4605 x 3

Half-Bridge MOSFET Drivers

VDC

J16

Jumper

NT1

Net Tie

AGND

3.2.2 Power Supply

The Motor Control Board can be powered through coaxial plug J1 or terminal connector
J2. Connector J1 can carry current up to 2.5A and connector J2 can handle up to 24A.
The board is designed to operate in the DC voltage range of 12-48V. DC link capacitors
are placed in parallel with the input to minimize the effects of voltage variation, depend­ing on the load, and to reduce ripple currents generated by the motor control inverter
during switching. The power supply block diagram is shown in Figure 3-2.

The input DC supply connects to the motor control inverter and auxiliary power supply.
The auxiliary power supply section consists of two DC-DC converters and an LDO volt­age regulator. The MIC28511 synchronous buck converter generates +12V output,
which powers the three half-bridge gate drivers used for driving the MOSFETs of the
three-phase inverter. The MCP16301 buck converter generates a +5V output, which is
provided to power the speed/position sensors interfaced via connectors, J7 and J8, and
the Click Boards™ interfaced via the mikroBUS™ sockets, J11 and J12. The fixed 3.3V
LDO MCP1826 generates +3.3V, which powers all logical circuits, including the
dsPIC33CK256MP508, operational amplifiers, mikroBUS sockets, USB to UART
converter, user interface elements, temperature sensors, speed/position sensors and
programmer/debugger Interfaces.

FIGURE 3-2: POWER SUPPLY BLOCK DIAGRAM

Three-Phase Inverter

Three-Phase Inverter Bridge

J2

Connector

+12V

+3.3 VA

+3.3V

Auxiliary Power Supply

PGND

+12V Output

+5V Output

J1

Connector

DGND

The 3.3V digital and analog supply, and ground connections are logically separated
using jumper resistors. In the Motor Control Board design documents, the digital
supply, digital ground, analog supply and analog ground are labeled as +3.3V, DGND,
+3.3 VA and AGND, respectively.

When required, the power to the inverter can be separated by cutting the trace between
net tie NT1. Then, the rest of the circuitry can be powered through the coaxial plug J1
and only the three-phase inverter powered through connector J2. The connection
between the net tie can be bridged back by populating jumper J16, restoring
connections between J1 and J2.

For additional details, refer to C.3 “Auxiliary Power Supply”, Section 2.2.1 “Power

Supply Connectors (J1, J2, J16)” and Figure A-1.

DS50002927A-page 32  2020 Microchip Technology Inc.

Hardware Description

+3.3 VA

R117
10k

R119

2.49k

U10
DNP

R120

7.5k

C74
DNP

C75

0.1 µF

AGND AGND AGND

R114

1k

C70

1000 pF

U5D

-D

+D

OUTD

MCP6024

R118

20R

V

REF

TP17

C72

0.1 µF

V

REF

13

12

14

1

32

3.2.3 Three-Phase Inverter Bridge

The three-phase motor power stage is implemented using six N-channel MOSFETs,
configured as three half-bridges. A resistor is connected across the gate and source of
each MOSFET to ensure a soft turn-off of the MOSFET when the gate signal is
disconnected. Low-ESR ceramic capacitors are provided across each half-bridge for
filtering high-frequency noise. The output of the three-phase inverter bridge is available
on connector J14.

Three half-bridge gate drivers (3 x MIC4605) are used for driving the low-side and
high-side MOSFETs of the motor control inverter. The high-side driver is powered by the
bootstrap circuit. The bootstrap circuit consists of an internal diode and an external
capacitor connected across to the gate driver HS and HB pins. The input pull-down resis­tors are internal to the gate driver. The gate drivers are powered by a +12V supply. Even
though the HS pin is rated for negative voltage, a diode resistor clamp is provided to
clamp the negative voltage on the HS pin to prevent excessive negative voltage from
damaging the driver. Depending upon the application and amount of negative voltage on
the switch node, a different resistor and diode can be selected. For more information,
refer to the “MIC4605 Data Sheet” (DS20005853) at: www.microchip.com.

3.2.4 Current Sensing Circuits

3.2.4.1 VOLTAGE REFERENCE CIRCUIT

The Reference Voltage (V

REF) is generated on the Motor Control Board; it is half the

analog supply voltage (+3.3 VA), that is, approximately +1.65V. This is used for provid­ing a DC voltage shift on the op amp output, allowing measurement of positive and
negative current swings as a single supply amplifier is used for current amplification.
The reference circuit (see Figure 3-3) is built around one of the MCP6024 op amps
(labeled as ‘D’). The resistors, R117, R119 and R120, form the voltage divider circuit
and generate a voltage equal to half of the analog voltage (+3.3 VA). The op amp, U5D
(MCP6024-D), is used as a buffer. The resistors, R114, R118 and C70, form a compen­sation circuit to drive capacitive loads, where C70 acts as a high-frequency feedback
path and R114 is used as a feedback path for low-frequency signals. The reference
voltage is connected to the inputs of the current sensing amplifiers providing DC bias
to amplifier outputs.

FIGURE 3-3: VOLTAGE REFERENCE CIRCUIT

 2020 Microchip Technology Inc. DS50002927A-page 33

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

3.2.4.2 CURRENT AMPLIFIERS

Field-Oriented Control (FOC) of the PMSM/BLDC motor requires the motor phase
current information for implementation. In the Motor Control Board, shunt resistors,
Rsh1, Rsh2 and Rsh3, are provided in each inverter leg to measure the amount of
current flowing through the motor phases. An additional shunt resistor, Rsh4, is
provided for sensing the total bus current as this information is necessary for over­current protection and current control of BLDC motors. The DC bus current information
can also be used for reconstruction of motor phase currents by appropriately sampling
currents during the PWM switching period, which is called a single-shunt reconstruction
algorithm.

Noninverting differential amplifier configuration is used for amplifying the voltage drop
across the shunt resistors proportional to the currents flowing through three-phase
Inverter Phases A, B and C, and bus current, respectively. The output voltage of the
amplifiers is shifted by Voltage Reference (V
current swings. The Common-mode and Differential-mode filters are added between
the input pins of all the amplifiers for noise filtering. It is also possible to add filters at
the output of the external amplifiers, U5-A, U5-B, U5-C
and U15.

The block diagram in Figure 3-4 illustrates the interconnections between the external
amplifiers and the dsPIC DSC analog peripherals, including internal amplifiers,
comparator, ADC, etc. The Motor Control Board enables phase and bus current ampli­fication through external amplifiers, U5 and U15, and dsPIC DSC internal amplifiers,
Op Amp 1 (OA1), Op Amp 2 (OA2) and Op Amp 3 (OA3). The op amps, OA1, OA2 and
OA3, that are internal to dsPIC33CK256MP508, are used for Phase A, Phase B and
bus current amplification. Three out of four amplifiers (U5-A, U5-B and U5-C) in the
quad amplifier, MCP6024, are configured to amplify current flowing through Inverter
Phases A, B and C. Amplified Phase C current (IC_EXT) is connected directly to an
analog input of the dsPIC DSC. The selection between internal and external amplifier
outputs is done via resistor jumpers (see Table 3-2) for Phase A, Phase B and the bus
currents when they are used as current feedbacks.

The op amp, MCP651S (U15), is added for DC bus current amplification. This amplifier
is configured to sense bus current. The U15 amplifier output is further filtered
(IBUS_FILT_EXT) and is connected to the internal Comparator 1 positive input
(CMP1C). The Comparator 1 negative input is configured to use the internal DAC out­put to set the overcurrent threshold. The Comparator 1 output (CMP1) generates an
active-high output when overcurrent is detected. This comparator output is available to
the PWM Generators of the high-resolution PWM module as a Fault input. If the Fault
is enabled in the PWM Generators, and CMP1 is selected as an active-high Fault
source during an overcurrent Fault condition, the motor control PWMs will be disabled,
thus protecting the MOSFETs.

REF) +1.65V to allow positive and negative

DS50002927A-page 34  2020 Microchip Technology Inc.

Hardware Description

TABLE 3-2: SELECTION BETWEEN EXTERNAL AND INTERNAL AMPLIFIER OUTPUTS

Jumper Resistor Settings

Current

Signal

Amplified Phase A
Currents

IA or IA_EXT

Amplified Phase B
Currents

IB or IB_EXT

Amplified Phase C
Currents

IC_EXT

Amplified Bus
Currents

IBUS or
IBUS_EXT

Populate Remove Populate Remove

R125 R121 R121 R125 In internal amplifier configuration,

configure and enable Op Amp 1 (OA1).
In external amplifier configuration,

ensure internal amplifier Op Amp 1
(OA1) is disabled.

R133 R129 R129 R133 In internal amplifier configuration,

configure and enable Op Amp 2 (OA2).
In external amplifier configuration,

ensure internal amplifier Op Amp 2
(OA2) is disabled.

Not Applicable Phase C current is amplified only by

external amplifier U5-C and its output
(IC_EXT) is connected directly to an
analog input of the dsPIC

R141 R137 R137 R141 In internal amplifier configuration,

configure and enable Op Amp 3 (OA3).
In external amplifier configuration,

ensure internal amplifier Op Amp 3
(OA3) is disabled.

RemarksInternal Amplifier Output External Amplifier Output

®

DSC.

The gain of the amplifier used for phase current and bus current sensing is set for
sensing 22A peak current by default. The gain of the amplifier can be changed, as
required by the application, by modifying the amplifier input and feedback resistors.

For more information, refer to C.2 “Current Amplifier Circuits”.

 2020 Microchip Technology Inc. DS50002927A-page 35

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

PGND

Three-Phase Inverter Bridge

)

)

)

REF

REF

REF

REF

REF

REF

REF

DAC

REF

AGND

T

IB

0R

R125

IA

0R

R133

0R

R141

R137

I

BUS

Note 1: This is a representational diagram only; for detailed schematics, refer to Appendix A. “Schematics

and Layout”.

FIGURE 3-4: CURRENT SENSE CONFIGURATION

Phase A Current (-)

Phase A Current (+)

Phase B Current (-)

Phase B Current (+)

Phase C Current (-)

Phase C Current (+)

+1.65V (+3.3VA/2)

Phase A Current (+)

Phase A Current (-

V

(+1.65V)

V

(+1.65V)

V

(+1.65V)

V

(+1.65V)

Rsh1 (0.010ȍ)

Phase B Current (+)

Rsh1 (0.010ȍ)

Phase B Current (-

Bus Current (+)

Rsh1 (0.010ȍ)

Bus Current (-)

MCP6024

-

U5A

+

-

U5B

+

-

U5C

+

IA_EX

Phase A Current (-)

Phase A Current (+)

V

IB_EXT

Phase B Current (-)

Phase B Current (+)

V

IC_EXT

IBUS_EXT

Bus Current (-)

Bus Current (+)

V

-

U5D

+

(1)

VDC

Phase C Current (+)

Phase C Current (-)

(+1.65V)

(+1.65V)

(+1.65V)

Rsh1 (0.010ȍ

R121

DNP

R129

DNP

DNP

dsPIC33CK256MP508

-

OA1

+

-

OA2

+

ADC

-

OA3

+

HRPWM

PG1
PG2
PG4

Fault PCI I/P

Bus Current (-)

Bus Current (+)

V

(+1.65V)

DS50002927A-page 36  2020 Microchip Technology Inc.

MCP651S

-

U15

+

R108

IBUS_FILT_EXT

C66

-

CMP1

+

3.2.5 Voltage Sensing Circuit

VBUS

301R

R83

V_BUS

DC Bus Voltage

VDC

3.3k

R87

0.1 μF

C52

V_A

V_B

PHASE_A

PHASE_B

V_C

PHASE_C

3.3k

R86

VB

301R

R82

3.3k

R84

VC

301R

R80

VA

301R

R81

3.3k

R85

1

2

3

BAS40-04

D6

1

2

3

BAS40-04

D5

1

2

3

BAS40-04

D4

1

2

3

BAS40-04

D7

AGND AGND AGND AGND

AGND

AGND

AGNDAGND

34k

R76

34k

R73

34k

R74

34k

R77

34k

R69

34k

R68

34k

R67

34k

R70

+3.3VA +3.3 VA

+3.3 VA

+3.3 VA

1000 pF

C51

1000 pF

C49

1000 pF

C50

A voltage sensing network is provided to scale down the DC supply voltage powering
the inverter to connect it to an analog channel of the dsPIC DSC for voltage measure­ment. The voltage divider network, formed by resistors, R69, R77 and R87, divides the
DC input voltage (V
DC input voltage (V_BUS) is connected to the analog input pin of the dsPIC DSC for
measurement.

FIGURE 3-5: VOLTAGE SENSING CIRCUIT

The Motor Control Board can also be to used to run BLDC motors with a trapezoidal
commutation scheme by monitoring back-EMF signals. For such an application, the
motor back-EMF is scaled down by voltage dividers before they are applied to the
analog channels of the dsPIC DSC. The filter capacitors are provided to filter the noise.
The voltage divider network divides phase voltages (PHASE_A, PHASE_B and
PHASE_C) at a voltage scaling ratio of 1:21.6 (see Figure 3-5). The scaled back-EMF
signals (V_A, V_B and V_C) are connected to analog input pins of the dsPIC DSC.

In case of any voltage transients, kickbacks or resistor failures, the clamping diodes are
provided at the scaled voltage outputs to ensure the voltages at the analog inputs do
not exceed the voltage limits of the dsPIC DSC inputs.

DC) at a voltage scaling ratio of 1:21.6 (see Figure 3-5). The scaled

Hardware Description

3.2.6 Hall Sensor/Quadrature Encoder Interface

The Motor Control Board can also be used to run PMSM/BLDC motor control
applications using the Hall sensor/Quadrature Encoder to determine rotor position and
speed. The connectors, J7and J8, are provided to interface Hall sensor feedback and
encoder feedback, respectively, with the Motor Control Board. The Hall sensor and
Quadrature Encoder Interface circuit supports either open-collector or push-pull
output sensors.

The Hall sensors and Quadrature Encoder can be powered by the +5V supply or +3.3V
supply available through the interface connector terminals. A capacitor is added to
each signal output to reduce the noise. The voltage divider can be configured to scale
down the sensor signal, from a +5V level to a +3.3V level, when push-pull output
sensors are powered by a +5V supply. For circuit details, refer to Figure A-6 in

Appendix A. “Schematics and Layout”.

The connector J7 and J8 pinouts are summarized in Section 2.2.4 “Hall Sensor

Interface Connector (J7)” and Section 2.2.5 “Quadrature Encoder Interface
Connector (J8)”.

 2020 Microchip Technology Inc. DS50002927A-page 37

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

AGND

DNP

R98

AGND

TEMP_EXT

DNP

R93

DNP

C57

1
2

DNP

J9

+3.3 VA

TEMP_EXT

TP21

3.2.7 External Temperature Sensor Interface

The Motor Control Board provides an optional external temperature sensor interface
circuit. This circuit can be used to interface a thermistor for measuring motor winding
temperature, etc. As shown in Figure 3-6, the temperature sensor and resistor R98
form a +3.3V analog supply voltage divider, setting the voltage proportional to the
temperature at the analog input of the dsPIC DSC. To reduce the noise, temperature
feedback can be further filtered by the RC filter, R93 and C57. This circuit is not
populated by default. When used, populate the connector J9 with
Part Number B2B-EH-A(LF)(SN) or similar, and components, R98, R93 and C57,
appropriately.

FIGURE 3-6: EXTERNAL TEMPERATURE INTERFACE CIRCUIT

3.2.8 User Interface

The dsPIC33CK Low-Voltage Motor Control Board user interface has three
push buttons, along with a potentiometer and LEDs. The potentiometer (POT1) can be
used for setting the speed reference, LEDs (LD11, LD12) are for status indication and
the general purpose push buttons (SW1, SW2 and SW3) can be used to start and stop
the motor. The LEDs, LD4 to LD9, indicate the presence of PWM outputs, which are
used for controlling the motor control inverter. Additionally, test pads (TP11, TP12 and
TP13) are provided on the unused pins of the dsPIC33CK256MP508, which can be
configured and used as general purpose inputs or outputs based on application
requirements.

For details, refer to Section 2.3 “User Interface Hardware”.

DS50002927A-page 38  2020 Microchip Technology Inc.

3.2.9 Debug Serial UART Interface

(U9)

(U13)

2

PKOB

Circuit

The board is equipped with a USB-UART interface based around the IC MCP2200. The
MCP2200 is a USB 2.0 to UART protocol converter with GPIO from the Microchip
‘Interfacing and Connectivity’ product portfolio. For a detailed description of these
products and the “MCP2200 Data Sheet” (DS20002228), visit the Microchip website:

www.microchip.com.

FIGURE 3-7: DEBUG SERIAL UART INTERFACE

Hardware Description

dsPIC33CK256MP508

DEBUG_TX

DEBUG_RX

R49 0R

R50 0R

The interconnections of debug serial UART Rx and Tx (labeled as DEBUG_RX and
DEBUG_TX) signals from the dsPIC33CK256MP508 are shown in Figure 3-7. These
signals are provided primarily to interface with MCP2200. To establish serial communi­cation between the host PC and the Motor Control Board, connect a USB cable
between the host PC and Micro-B connector J6, which connects to the MCP2200
USB-UART converter. This USB-UART connection setup can support a baud rate of up
to 1 Mbps.

There is an additional header, J3, which is provided on the board to allow interfacing of
any other USB-UART serial converters. As shown in Figure 3-7, the UART Tx and Rx
signals between the dsPIC33CK256MP508 are connected to J3 (Pins #2 and #3).
When interfacing an external USB to UART converter through connector J3, disable
the on-board MCP2200 by holding its RST pin low. This can be done by connecting Pin
Number 5 of the J3 connector to DGND or removing resistor R153 (4.7k) and
populating R159 (4.7k).

The Rx and Tx signals of the dsPIC33CK256MP508 are connected to the PKOB circuit
by populating jumper resistors, R49 and R50, with 0 Ohms. This will allow the PICkit
On-Board (PKOB) programming/debugging tool to also be used as a debug serial
interface through the virtual COM port feature of the tool.

Collaterals, such as the USB driver, information related to driver installation and how to
access ports for operating systems (Linux
Microchip website (http://www.microchip.com/MCP2200). Under Windows OS, after
successful driver installation, the device will appear as the ‘COMx’ port object which
standard terminal programs can open to read and write data.

MCP2200

R157

0R

Rx

R158

0R

Tx

D+

D-

RST

+3.3V

R153

R159

DGND

®

, Mac® and Windows®) can be found on the

UART_USB_P

UART_USB_N

MCP2200_RST

DEBUG_TX

DEBUG_RX

J6

J3

5

3

 2020 Microchip Technology Inc. DS50002927A-page 39

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

The MPLAB® X IDE hosts two plug-ins, which allow real-time diagnostics through a
serial USB-UART interface with external host PC. These are:

• X2C-Scope from the Linz Center of Mechatronics GmbH for use with the
X2C-Scope plug-in for MPLAB X IDE.

• RTDM from Microchip for use with the MPLAB DMCI plug-in.

3.2.10 mikroBUS™ Sockets

The Motor Control Board has two mikroBUS sockets, labeled ‘A’ and ‘B’. These
sockets are provided to attach mikroBUS add-on boards, called Click Boards™, to
expand the capability of the Motor Control Board by adding sensors, displays, storage
and communication interfaces. One hundred plus unique Click Boards are available
based on Microchip products (visit https://www.mikroe.com/brands/microchip) in cate­gories, such as wireless connectivity (Wi-Fi, Bluetooth
position sensors, remote temperature, thermocouple, ECG, IrDA
LIN, Ethernet

®

, DALI™, EtherCAT), mixed signal (ADC, DAC), storage (EEPROM,

Flash, SRAM) and security, for example.

The mikroBUS socket comprises a pair of 1x8 female headers with an exclusive pin
configuration. The pinout consists of three communication interfaces, SPI, UART and

2

I

C, six additional pins for PWM, interrupt, analog input, Reset and chip select, and two

power groups, +3.3V and 5V. For available Click Boards, visit www.mikroe.com.

It is recommended that users verify that the connection requirement of the specific
Click Board is satisfied prior to interfacing. For pin mapping information between the
dsPIC DSC and the mikroBUS sockets, refer to the schematics in Section A.1 “Board

Schematics and Layout” or Section 2.4 “Pin Functions of the dsPIC DSC”. These

interfaces are not isolated from the input supply connected to the Motor Control Board.

®

, LoRa®), sensors (inductive

®

), interfaces (CAN,

DS50002927A-page 40  2020 Microchip Technology Inc.

Hardware Description

3.2.11 Programmer/Debugger Interface

The board has a PICkit™ On-Board (PKOB) programming/debugging tool, which can
be used to program and debug the target device: dsPIC33CK256MP508 (U9). The
PKOB should automatically enumerate and be recognized by the MPLAB X IDE, v5.30
or later, when the dsPIC33CK Low-Voltage Motor Control Board is connected to the
host PC via the USB Micro-B connector, J13. No custom USB driver installation is
necessary as the PKOB relies on standard OS provided Human Interface Device (HID)
drivers, and therefore, the driver installation should be fully automatic. When plugged
in, the PKOB programmer/debugger tool can be selected from the MPLAB X IDE
project properties page by selecting the device under:

Hardware Tools>Microchip Kits>Starter Kits (PKOB)>Curiosity/Starter Kits(PKOB4)>
MPLAB PKoB 4,

as shown in Figure 3-8.

FIGURE 3-8: MPLAB PKoB 4 SELECTION IN MPLAB

®

X IDE

 2020 Microchip Technology Inc. DS50002927A-page 41

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

Additionally, a 6-pin ICSP™ programming header, J10, is provided for connecting
the programmer/debugger (for example, PICkit™ 4 In-Circuit Debugger
Part Number: PG164140). For connector pin details, refer to Section 2.2.7 “ICSP™

Header for Programmer/Debugger Interface (J10)”.

The PKOB or ICSP programming header is not isolated from the input supply
connected to the Motor Control Board.

The debugger may need to be forced into Recovery Boot mode (reprogrammed) in rare
situations. In such situations, to use the Hardware Tool Emergency Boot Firmware
Recovery Utility, carefully follow the instructions found in MPLAB
main menu option Debug>Hardware Tool Emergency Boot Firmware Recovery
jumper connector J4 is provided in the PKOB Programming/Debugging Tool section of
the Motor Control Board to switch the PKOB to Recovery Boot mode. The location of
the J4 connector in the Motor Control Board is marked in Figure 2-1.

®

X IDE under the

. The

DS50002927A-page 42  2020 Microchip Technology Inc.

Appendix A. Schematics and Layout

A.1 BOARD SCHEMATICS AND LAYOUT

This section provides schematics and PCB layout diagrams of the dsPIC33CK
Low-Voltage Motor Control Board. The Motor Control Board uses a four-layer FR4, 1.6
mm, Plated-Through-Hole (PTH) construction.

Ta bl e A - 1 summarizes the schematics of the Motor Control Board:

TABLE A-1: SCHEMATICS

Figure Index

Figure A-1 1 of 8 Input Power Supply Connections: +12V DC-DC Converter;

Figure A-2 2 of 8 dsPIC33CK256MP508 Interconnections: MCLR

Figure A-3 3 of 8 1.65V Voltage Reference Buffer: External Operational

Figure A-4 4 of 8 Motor Control Inverter: Gate Drivers; Three-Phase MOSFET

Figure A-5 5 of 8 Click Board Sockets (A, B); LED Indications; Push Buttons;

Figure A-6 6 of 8 Hall Sensor Interface Circuit; Quadrature Encoder Interface

Figure A-7 7 of 8 PKOB: Microcontroller; USB Port, etc.

Figure A-8 8 of 8 PKOB: Buffers

Schematics

Sheet No.

+5V DC-DC Converter; +3.3V LDO

ICSP™ Header; dsPIC
amplifying Bus Current and Phase Currents

Amplifiers for amplifying Bus Current and Phase Currents;
Potentiometer; DC Bus Voltage Sensing Circuit; Phase
Voltages Sensing Circuit; Temperature Sensing Circuits

Bridge

USB to UART Converter

Circuit

dsPIC33CK LOW-VOLTAGE

MOTOR CONTROL BOARD

USER’S GUIDE

Hardware Sections

®

DSC Operational Amplifiers for

Reset;

Ta bl e A - 2 summarizes the layout diagrams of the Motor Control Board:

TABLE A-2: PCB LAYERS

Figure Index Description

Figure A-9 Top Layer: Top Silk and Top Copper

Figure A-10 Mid Layer -1: Copper

Figure A-11 Mid Layer -2: Copper

Figure A-12 Bottom Layer: Bottom Silk and Bottom Copper

 2020 Microchip Technology Inc. DS50002927A-page 43

Designed with

Altium.com

PGND

MCP16301

BOOST

1

GND

2

V

FB

3

EN

4

SW

6

V

IN

5

U11

1N4148

D2

+5V

V

IN

1

GND

2

V

OUT

3

MCP1826S/3.3V

U12

+3.3 VA

2

3

1

POWER 2 mm

J1

1M

R16

V

DD

19

PV

DD

20

PV

IN

7

PV

IN

8

PV

IN

9

V

IN

17

FREQ

24

EN

16

DL (NC)

1

DH (NC)

3

SW

12

SW

21

(EPAD3) SW

27

LX

5

PV

IN

4

PVIN (EPAD1)

25

BST

6

I

LIM

18

FB

14

PGOOD

15

AGND

13

PGND

2

PGND

10

PGND

11

PGND

22

PGND

23

(EPAD2) PGND

26

MIC28511

U1

0.1uF

C2

0.1 μF
16V

C6

100k

R3

PGND

+12V

DNP

TP5

DNP

TP1

V

DC

DNP

TP4

+5V

DNP

TP6

0.1 μF
100V

C21

10 μF
25V

C23

10 μF
25V

C31

82R

R13

4.7R

R17

120 pF
100V

C33

MBRA140T3G

D3

52.3k

R14

10k

R18

1.21R

R2

2.2 μF
10V

C1

2.2 μF
10V

C3

100k

R8

100k

R7

DNP

R11

1.21R

R5

2.2 μF
100V

C15

22 μF
100V

C13

BAT46W

D1

10R

R1

DNP

C4

PGND

100 μH

L1

47 μF
35V

C7

2.2 μF
100V

C8

715R

R10

3300 pF
50V

C5

10 μF
16V

C100

10 μF
16V

C101

+12V

10 μF
16V

C104

10 μF
16V

C105

0R
0805

R15

0.1 μF
16V

C102

0.1 μF
16V

C103

0.1 μF
16V

C106

0.1 μF
16V

C22

0.1 μF

C39

PGND

PGND

0R
0805

R19

AGND

PGND

DGND

DGND

DNP

TP3

+12V

+3.3V

+3.3V

1k

R4

V

DC

PGND PGND

+3.3VA

DGND

AGND

Black TP

TP7

Black TP

TP8

Black TP

TP9

22 μH

L2

1

2

TERMINAL 1x2

J2

330 μF
63V

C10

330 μF
63V

C11

330 μF
63V

C12

330 μF
63V

C9

0.1 μF

C30

10k

R6

10k

R9

12

HDR-2.54 Male 1x2

J16

DGND

Black TP

TP18

DGND

Black TP

TP19

AGND

Black TP

TP20

Net Tie

0.5 mm

R12

Net Tie
5mm

NT1

PGND

Black TP

TP22

DS50002927A-page 44  2020 Microchip Technology Inc.

FIGURE A-1: SCHEMATICS PAGE 1 OF 8

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

 2020 Microchip Technology Inc. DS50002927A-page 45

Internal Op Amp

OA2IN-

IB

OA2IN+

SHUNT_IB_N

SHUNT_IB_P

AGND

AGND

IB_EXT

VREF

OA3IN-

IBUS

OA3IN+

SHUNT_IBUS_N

SHUNT_IBUS_P

AGND

AGND

IBUS_EXT

VREF

OA1IN-

IA

OA1IN+

SHUNT_IA_N

VREF

+

-

+

-

+

-

0603

DNP

R137

0603

DNP

R129

IB

IBUS

OA2

OA3

OA1

The operational amplifiers, OA1, OA2 and OA3, are internal to dsPIC33CK256MP508

AGND

AGND

IA_EXT

0603

DNP

R121

SHUNT_IA_P

dsPIC33CK256MP508

MCLR

RP46/PWM1H/PMD5/RB14

1

AN20/RE0

2

RP47/PWM1L/PMD6/RB15

3

AN21/RE1

4

RP60/PWM8H/PMD7/RC12

5

RP61/PWM8L/PMA5/RC13

6

RP62/PWM6H/PMA4/RC14

7

RP63/PWM6L/PMA3/RC15

8

MCLR

9

RP79/PCI22/PMA2/RD15

10

Vඌඌ

11

Vൽൽ

12

RP78/PCI21/RD14

13

ANN2/RP77/RD13

14

AN12/ANN0/RP48/RC0

15

OA1OUT/AN0/CMP1A/IBIAS0/RA0

16

AN22/RE2

17

OA1IN-/ANA1/RA1

18

AN23/RE3

19

OA1IN+/AN9/PMA6/RA2

20

DACOUT1/AN3/CMP1C/RA3

21

RE4

22

OA3OUT/AN4/CMP3B/IBIAS3/RA4

23

RE5

24

AVൽൽ

25

AVඌඌ

26

RP76/RD12

27

OA3IN-/AN13/CMP1B/ISRC0/RP49/PMA7/RC1

28

OA3IN+/AN14/CMP2B/ISRC1/RP50/PMD13/PMA13/RC2

29

AN17/ANN1/IBIAS1/RP54/PMD12/PMA12/RC6

30

Vൽൽ

31

Vඌඌ

32

AN15/CMP2A/IBIAS2/RP51/PMD11/PMA11/RC3

33

OSCI/CLKI/AN5/RP32/PMD10/PMA10/RB0

34

OSCO/CLKO/AN6/RP33/PMA1/PMALH/PSA1/RB1

35

AN19/CMP2C/RP75/PMA0/PMALL/PSA0/RD11

36

RE6

37

AN18/CMP3C/ISRC3/RP74/PMD9/PMA9/RD10

38

RE7

39

AN16/ISRC2/RP55/PMD8/PMA8/RC7

40

OA2OUT/AN1/AN7/ANA0/CMP1D/CMP2D/CMP3D/RP34/SCL3/INT0/RB2

41

RE8

42

PGD2/OA2IN-/AN8/RP35/RB3

43

RE9

44

PGC2/OA2IN+/RP36/RB4

45

RP56/ASDA1/SCK2/RC8

46

RP57/ASCL1/SDI2/RC9

47

RP73/PCI20/RD9

48

RP72/SDO2/PCI19/RD8

49

Vඌඌ

50

Vൽൽ

51

RP71/PMD15/RD7

52

RP70/PMD14/RD6

53

RP69/PMA15/PMCS2/RD5

54

PGD3/RP37/SDA2/PMA14/PMCS1/PSCS/RB5

55

PGC3/RP38/SCL2/RB6

56

RE10

57

TDO/AN2/CMP3A/RP39/SDA3/RB7

58

RE11

59

PGD1/AN10/RP40/SCL1/RB8

60

PGC1/AN11/RP41/SDA1/RB9

61

RE12

62

RP52/PWM5H/ASDA2/RC4

63

RE13

64

RP53/PWM5L/ASCL2/PMWR/PMENB/PSWR/RC5

65

RP58/PWM7H/PMRD/PMWR/PSRD/RC10

66

RP59/PWM7L/RC11

67

RP68/ASDA3/RD4

68

RP67/ASCL3/RD3

69

Vඌඌ

70

Vൽൽ

71

RP66/RD2

72

RP65/PWM4H/RD1

73

RP64/PWM4L/PMD0/RD0

74

TMS/RP42/PWM3H/PMD1/RB10

75

TCK/RP43/PWM3L/PMD2/RB11

76

RE14

77

TDI/RP44/PWM2H/PMD3/RB12

78

RE15

79

RP45/PWM2L/PMD4/RB13

80

dsPIC33CK256MP508

U9

PWM_AL

OSCO

OSCI

OA2IN­OA2IN+

IB

OA3IN­OA3IN+

IBUS

OA1IN-

IA

OA1IN+

+3.3V

PWM_AH

PWM_BL

PWM_BH

PWM_CH

PWM_CL

CLICK_AN_B
CLICK_AN_A

QEI_A
QEI_B
QEI_INDEX
QEI_HOME

CLICK_INT_A

DEBUG_RX

DEBUG_TX

SPEED_REFERENCE

V_B

V_A

TEMP_EXT

CLICK_SCK_A

V_C

TEMP_LOCAL

CLICK_MOSI_A

LED1

CLICK_MISO_A

LED2 CLICK_TX_A

CLICK_SCK_B
CLICK_MOSI_B

CLICK_CS_B

CLICK_MISO_B

CLICK_RX_B

CLICK_TX_B

CLICK_RX_A

PGC

PGD

IBUS_FILT_EXT

BUTTON1

IC_EXT

V_BUS

BUTTON2
BUTTON3

CLICK_SDA_B
CLICK_SCL_B

CLICK_PWM_B
CLICK_INT_B

HALL_A
HALL_B
HALL_C

CLICK_RST_B

CLICK_RST_A

DNP

X2

OSCI OSCO

PIN 12

PIN 51

PIN 71

PIN 31

+3.3V

+3.3V

+3.3V

+3.3V

PIN25

PGC

PGD

+3.3V

4.7k

R142

+3.3V

14

23

PTS645SM43SMTR92 LFS

SW4

62R 1%

R144

1000 pF
50V

C96

470R 0.1%

R139

470R 0.1%

R145

62R 1%

R138

62R 1%

R134

1000 pF
50V

C87

470R 0.1%

R131

470R 0.1%

R135

62R 1%

R130

62R 1%

R126

1000 pF
50V

C80

470R 0.1%

R123

470R 0.1%

R127

62R 1%

R122

4.7 μF
10V
TANT-A

C77

0.1 μF

C78

0.1 μF

C81

0.1 μF

C85

0.1 μF

C89

0.1 μF

C92

0.1 μF

C99

0.1 μF

C97

DNP

C94

DNP

C95

IA

DNP

C76

DNP

C83

DNP

C84

DNP

C88

DNP

C91

DNP

C98

AGND

AGND

DGND

DGND

DGND

DGND

DGND

DGND

DGND DGND

DGND

+3.3 VA

+3.3 VA

0R

R125

0R

R133

0R

R141

10000 pF

C79

10000 pF

C82

10000 pF

C86

10000 pF

C90

10000 pF

C93

100R

R143

MCLR

MCLR

CLICK_CS_A
CLICK_PWM_A

CLICK_SCL_A
CLICK_SDA_A

DNP

TP11

DNP

TP12

DNP

TP13

4.02k

0.1%

R124

4.02k 0.1%

R132

4.02k

0.1%

R128

4.02k 0.1%

R136

4.02k 0.1%

R140

4.02k 0.1%

R146

1
2
3
4
5
6

ICSP™

MCLR

Vൽൽ

GND

PGD
PGC

AUX

DNP

J10

FIGURE A-2: SCHEMATICS PAGE 2 OF 8

Schematics and Layout

DS50002927A-page 46  2020 Microchip Technology Inc.

External Op Amp

VREF

7.5k

R120

2.49k

R119

3

2

1

DNP

U10

0R

0603

R75

IA_EXT

IA_EXT

VREF

SHUNT_IA_P

SHUNT_IA_N

IB_EXT

SHUNT_IB_P

SHUNT_IB_N

IC_EXT

SHUNT_IC_P

SHUNT_IC_N

IBUS_EXT

SHUNT_IBUS_P

SHUNT_IBUS_N

IBUS_FILT_EXT

62R 1%

R71

62R 1%

R78

1000 pF
50V

C46

470R 0.1%

R72

470R 0.1%

R79

DNP

C48

DNP

C107

DNP

C47

-A

2

+A

3

OUTA

1

Vඌඌ

11

Vൽൽ

4

MCP6024

U5A

+B

5

-B

6

OUTB

7

OU

MCP6024

U5B

+C

10

-C

9

OUTC

8

C

C

OUTC

MCP6024

U5C

+D

12

-D

13

OUTD

14

D

D

OUTD

MCP6024

U5D

0R
0603

R94

IB_EXT

VREF

62R 1%

R90

62R 1%

R95

1000 pF
50V

C54

470R 0.1%

R91

470R 0.1%

R96

DNP

C59

DNP

C53

DNP

C56

0R
0603

R109

IC_EXT

VREF

62R 1%

R112

1000 pF
50V

C64

470R 0.1%

R106

470R 0.1%

R113

DNP

C69

62R 1%

R105

DNP

C62

DNP

C67

1k

R114

0R
0603

R107

VREF

62R 1%

R110

1000 pF

C63

470R 0.1%

R104

470R 0.1%

R111

DNP

C68

62R 1%

R103

DNP

C61

DNP

C65

+A

3

-A

4

OUTA

1

Vඌඌ

2

Vൽൽ

5

MCP651S

U15

0.1 μF

C73

0.1 μF

C71

0.1 μF

C72

1000 pF

C70

0.1 μF

C75

20R

R118

DNP

C74

Vඊඝඛ

301R

R83

V_BUS

DC Bus Voltage

VDC

3.3k

R87

0.1 μF

C52

V_A

V_B

Phase Voltage Feedbacks

PHASE_A

PHASE_B

V_C

PHASE_C

3.3k

R86

VB

301R

R82

3.3k

R84

VC

301R

R80

VA

301R

R81

3.3k

R85

AGND

DNP

R98

AGND

TEMP_EXT

Temperature Sensor Interface – External

DNP

R93

DNP

C57

GND

2

Vඈඎඍ

3

Vൽൽ

4

MCP9700

U14

TEMP_LOCAL

100R

R97

AGND

Temperature Sensor – MOSFET Thermal Protection

200R

R92

0.1 μF

C60

SPEED_REFERENCE

Speed Reference

0.1 μF

C58

1

2

3

BAS40-04

D6

1

2

3

BAS40-04

D5

1

2

3

BAS40-04

D4

1

2

3

BAS40-04

D7

1
2

DNP

J9

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND AGND AGND

AGND

AGND

AGND

AGND

AGND AGND

AGNDAGND

AGND AGND AGND AGND

AGND

AGND

AGNDAGND

34k

R76

34k

R73

34k

R74

34k

R77

34k

R69

34k

R68

34k

R67

34k

R70

+3.3 VA

+3.3 VA

+3.3 VA

+3.3 VA

AGND

+3.3 VA

+3.3 VA

+3.3 VA

+3.3 VA

+3.3 VA

+3.3 VA

+3.3 VA

+3.3 VA

1 μF

C55

2

1

3

10k

POT1

IBUS_FILT_EXT

Voltage Reference

DC Bus Current Sensing Circuit

100R

R99

IBUS_EXT

1000 pF

C51

1000 pF

C49

1000 pF

C50

10k

R117

TEMP_EXT

TP21

TEMP_LOCAL

TP14

Vඋൾൿ

TP17

PGND

4.02k 0.1%

R66

4.02k 0.1%

R88

4.02k 0.1%

R89

4.02k 0.1%

R100

4.02k 0.1%

R102

4.02k 0.1%

R115

4.02k 0.1%

R101

4.02k 0.1%

R116

200R

R108

10000 pF

C66

FIGURE A-3: SCHEMATICS PAGE 3 OF 8

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

-B

TB

-

-

 2020 Microchip Technology Inc. DS50002927A-page 47

HS_GATE_AHO_A

LS_GATE_ALO_A

HS_GATE_BHO_B

LS_GATE_BLO_B

HS_GATE_CHO_C

LS_GATE_CLO_C

SHUNT_IBUS_N

332k

R176

332k

R179

PHASE_A

SHUNT_IA_N

332k

R175

332k

R177

SHUNT_IB_P

332k

R174

332k

R178

SHUNT_IC_P

Vൽർ

PGND

SHUNT_IB_N

SHUNT_IC_N

SHUNT_IA_P

PGND PGND

HS_GATE_A

HS_GATE_B HS_GATE_C

LS_GATE_A

LS_GATE_B

LS_GATE_C

SHUNT_IBUS_P

PHASE_A
PHASE_B
PHASE_C

PHASE_B

PHASE_C

DNP

D10

DNP

D12

DNP

D8

DNP

D9

DNP

D11

DNP

D13

DNP

R198

HO_A

LO_A

1 μF

C138

PGND

PHASE_A

1 μF

C140

+12V

PGND

PWM_AH

PWM_AL

HO_B

LO_B

1 μF

C139

PGND

PHASE_B

PGND

1 μF

C141

+12V

PWM_BH

PWM_BL

HO_C

LO_C

1 μF

C136

PGND

PHASE_C

1 μF

C137

PGND

PWM_CH

PWM_CL

DNP

C132

2.2 μF
100V

C124

DNP

C125

DNP

C135

DNP

C130

DNP

C133

DNP

C131

DNP

C134

2.2 μF
100V

C126

DNP

C127

2.2 μF
100V

C128

DNP

C129

PGND PGND

PGND PGND

+12V

2.74R

R195

2.74R

R196

2.74R

R192

DNP

R197

DNP

R199

DNP

R200

DNP

R193

DNP

R194

DNP

R187

DNP

R191

DNP

R186

DNP

R190

DNP

R181

DNP

R183

VDC

HB

2

HO

3

HS

4

Vඌඌ

7

LI

6

LO8Vൽൽ

1

HI

5

MIC4605-1YM-TR

U16

HB

2

HO

3

HS

4

Vඌඌ

7

LI

6

LO8Vൽൽ

1

HI

5

MIC4605-1YM-TR

U17

HB

2

HO

3

HS

4

Vඌඌ

7

LI

6

LO8Vൽൽ

1

HI

5

MIC4605-1YM-TR

U18

0.01R
2512
±1%

Rsh2

0.01R
2512
±1%

Rsh3

0.01R
2512
±1%

Rsh4

4

1,2,3

5,6,7,8

SIR120DP

Q1

4

1,2,3

5,6,7,8

SIR120DP

Q2

4

1,2,3

5,6,7,8

SIR120DP

Q3

4

1,2,3

5,6,7,8

SIR120DP

Q4

4

1,2,3

5,6,7,8

SIR120DP

Q5

4

1,2,3

5,6,7,8

SIR120DP

Q6

1

2

3

TERMINAL 1x3

J14

0.01R
2512
±1%

Rsh1

PGNDPGND

PGNDPGND

PGNDPGND

VSSA210-E3/61T

D15

VSSA210-E3/61T

D16

VSSA210-E3/61T

D14

39R
0805

R185

39R
0805

R189

39R
0805

R188

39R
0805

R184

39R
0805

R182

39R
0805

R180

FIGURE A-4: SCHEMATICS PAGE 4 OF 8

Schematics and Layout

DS50002927A-page 48  2020 Microchip Technology Inc.

1k

R161

1k

R162

1k

R163

1k

R164

PWM_AH

PWM_AL

LED1

LED2

1k

R165

1k

R166

PWM_BH

PWM_BL

1k

R167

1k

R168

PWM_CH

PWM_CL

BUTTON3

4.7k

R149

+3.3V

14

2

3

PTS645SM43SMTR92 LFS

SW3

BUTTON2

4.7k

R148

+3.3V

142

3

PTS645SM43SMTR92 LFS

SW2

BUTTON1

4.7k

R147

+3.3V

1

4

23

PTS645SM43SMTR92 LFS

SW1

GREEN

LD4

GREEN

LD5

GREEN

LD6

GREEN

LD7

GREEN

LD8

GREEN

LD9

RED

LD3

YELLOW

LD10

YELLOW

LD11

1k

R160

mikroBUS™ Interface A

+3.3V

CLICK_SCL_A
CLICK_SDA_A

CLICK_MISO_A
CLICK_MOSI_A

CLICK_SCK_A

CLICK_CS_A

CLICK_INT_A

CLICK_TX_A

CLICK_RX_A

CLICK_PWM_ACLICK_AN_A

CLICK_RST_A

AN

1

RST

2

CS

3

SCK

4

MISO

5

MOSI

6

+3.3V

7

GND

8

PWM

16

INT

15

RX

14

TX

13

SCL

12

SDA

11

+5V

10

GND

9

J11

Note:

PWM Indication LEDs

General Purpose LEDs

Power-on Status

DNP

R20

DNP

R21

+3.3V

+5V

I2C pull-ups are not populated, typically installed on mikroBUS daughter boards.

Diagnostics USB to UART Interface

ID

4

V

BUS

1

GND

5

D-

2

D+

3

0

USB Micro-B TH/SMT

J6

4.7k

R153

V

DD

1

OSC1

2

OSC2

3

RST

4

GP7/TxLED

5

GP6/RxLED

6

GP5

7

GP4

8

GP3

9

TX10RTS

11

RX

12

CTS

13

GP2

14

GP1

15

GP0

16

V

USB

17

D-

18

D+

19

V

SS

20

MCP2200

U13

2

3 1

12 MHz

X1

UART_USB_P
UART_USB_N

+3.3V+3.3V

5V_USB

UART_USB_N
UART_USB_P

1k

R154

1k

R156

GREEN

LD2

YELLOW

LD1

+3.3V +3.3V

MCP2200_RST

DNP

R159

0R

R158

DEBUG_RX 0R

R157

DEBUG_TX

5V_USB

12345

HDR-2.54 Male 1x5

DNP

J3

MCP2200_RST

DEBUG_RX

DEBUG_TX

+3.3V

mikroBUS™ Interface B

+3.3V CLICK_SCL_B

CLICK_SDA_B

CLICK_MISO_B
CLICK_MOSI_B

CLICK_SCK_B

CLICK_CS_B

CLICK_INT_B

CLICK_TX_B

CLICK_RX_B

CLICK_PWM_BCLICK_AN_B

CLICK_RST_B

AN

1

A

N

RST

2

CS

3

SCK

4

MISO

5

MOSI

6

+3.3V

7

GND

8

PWM

16

INT

15

RX

14

TX

13

SCL

12

SDA

11

+5V

10

GND

9

J12

Note:

DNP

R22

DNP

R169

+3.3V

+5V

I2C pull-ups are not populated, typically installed on mikroBUS daughter boards.

Push Buttons

+3.3V

0.1 μF

C108

0.1 μF

C116

0.1 μF

C117

DGND DGND

DGND DGND DGND

DGND

DGND DGND

DGND

DGND

DGND

DGND

DGND

DGND

DGND

DGND

DGND

DGND DGND

DGND DGND DGND DGND DGND DGND

DGND

DGND

100R

R150

100R

R151

100R

R152

LED2

TP16

LED1

TP15

PWM_CH

PWM_CL

PWM_BH

PWM_BL

PWM_AH

PWM_AL1

2
3
4
5
6
7

1

4

5

6

7

DNP

J15

DGND

0.1 μF

C118

0.1 μF

C119

0.1 μF

C120

0.1 μF

C121

0.1 μF

C122

0.1 μF

C123

0.1 μF

C142

FIGURE A-5: SCHEMATICS PAGE 5 OF 8

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

3

 2020 Microchip Technology Inc. DS50002927A-page 49

+5V

HALL_A

HALL_C

HALL_A

HALL_B HALL_C

HAL L

100 pF

C109

100 pF

C110

100 pF

C111

HALL_B

4.7k

R170

4.7k

R171

4.7k

R172

Hall Sensor Interface

+5V

QEI_A

QEI_INDEX

QEI_A QEI_B QEI_INDEX QEI_HOME

QE I

QEI_B

QEI_HOME

+3.3V

+3.3V

Quadrature Encoder Interface

+3.3V

+3.3V

DGND DGND DGND DGND DGND DGND

DGND DGND DGND DGND DGND DGND DGND DGND

DGND

DGND

1
2
3
4
5
6

TERMINAL 1x6

J7

1
2
3
4
5
6

TERMINAL 1x6

J8

DNP

R202

DNP

R201

DNP

R52

100R

R173

100R

R204

100R

R203

2.2k

R62

2.2k

R63

2.2k

R64

2.2k

R65

1k

R58

1k

R59

1k

R60

1k

R61

DNP

R55

DNP

R57

DNP

R56

DNP

R54

10 pF

C112

10 pF

C113

10 pF

C143

10 pF

C144

Bumpon Hemisphere Black

PAD1 PAD2 PAD3 PAD4

SD103AW

D17

Fiducial

FD1

Fiducial

FD2

Fiducial

FD3

Fiducial

FD4

SD103AW

D18

SD103AW

D19

SD103AW

D20

SD103AW

D21

SD103AW

D22

SD103AW

D23

HOME

FIGURE A-6: SCHEMATICS PAGE 6 OF 8

Schematics and Layout

DS50002927A-page 50  2020 Microchip Technology Inc.

D_P

D_N

ID

4

V

BUS

1

GND

5

D-

2

D+

3

0

USB MICRO-B FEMALE

J13

PICkit™ On-Board 4

PKOB USB Interface

3V3

DSC6011JI1A-012.0000

0.1 μF
25V

0603

C28

STB

1

GND2OUT

3

V

DD

4

12.00 MHz

X3

ATSAME70N21B-ANT

PA0/PWMC0_PWMH0/TIOA0/A17/BA1

72

PA1/PWMC0_PWML0/TIOB0/A18

70

PA2/PWMC0_PWMH1/DATRG

66

PA3/TWD0/LONCOL1/PCK2

64

PA4/TWCK0/TCLK0/UTXD1

55

PA5/WMC1_PWML3/ISI_D4/URXD1

52

PA7/XIN32

24

PA8/XOUT32

25

PA9/URXD0/ISI_D3/PWMC0_PWMFI0

54

PA10/UTXD0/PWMC0_PWMEXTRG0/RD

46

PA11/QCS/PWMC0_PWMH0/PWMC1_PWML0

44

PA12/QIO1/PWMC0_PWMH1/PWMC1_PWMH0

48

PA13/QIO0/PWMC0_PWMH2/PWMC1_PWML1

27

PA14/QSCK/PWMC0_PWMH3

34

PA15/D14/TIOA1/PWMC0_PWML3

33

PA16/D15/TIOB1/PWMC0_PWML2

30

PA17/QIO2/PCK1/PWMC0_PWMH3

16

PA18/PWMC1_PWMEXTRG1/PCK2/A14

15

PA19/PWMC0_PWML0/A15

14

PA20/PWMC0_PWML1/A16/BA0

13

PA21/RXD1/PCK1/PWMC1_PWMFI0

21

PA22/RK/PWMC0_PWMEXTRG1/NCS2

26

PA23/SCK1/PWMC0_PWMH0/A19

31

PA24/RTS1/PWMC0_PWMH1/A20

38

PA25/CTS1/PWMC0_PWMH2/A23

40

PA26/DCD1/TIOA2/MCDA2

42

PA27/DTR1/TIOB2/MCDA3

50

PA28/DSR1/TCLK1/MCCDA

79

PA30/PWMC0_PWML2/PWMC1_PWMEXTRG0

82

PA31/SPI0_NPCS1/PCK2/MCDA1

83

PB0/PWMC0_PWMH0/RXD0

12

PB1/PWMC0_PWMH1/GTSUCOMP/TXD0

11

PB2/CANTX0/CTS0

17

PB3/CANRX0/PCK2/RTS0

20

PB4/TDI/TWD1/PWMC0_PWMH2

74

PB5/TDO/TWCK1/PWMC0_PWML0

77

PB6/SWDIO/TMS

57

PB7/SWCLK/TCK

63

PB8/XOUT

98

PB9/XIN

99

PB12/ERASE/PWMC0_PWML1/GTSUCOMP

61

PB13/PWMC0_PWML2/PCK0/SCK0

100

PD0/GTXCK/PWMC1_PWML0/SPI1_NPCS1

1

PD1/GTXEN/PWMC1_PWMH0/SPI1_NPCS2

92

PD2/GTX0/PWMC1_PWML1/SPI1_NPCS3

91

PD3/GTX1/PWMC1_PWMH1/UTXD4

89

PD4/GRXDV/PWMC1_PWML2/TRACED0

88

PD5/GRX0/PWMC1_PWMH2/TRACED1

87

PD6/GRX1/PWMC1_PWML3/TRACED2

85

PD7/GRXER/PWMC1_PWMH3/TRACED3

84

PD8/GMDC/PWMC0_PWMFI1

80

PD9/GMDIO/PWMC0_PWMFI2/AFE1_ADTRG

78

PD10/PWMC0_PWML0/TD

71

PD11/GRX2/PWMC0_PWMH0/GTSUCOMP

69

PD12/GRX3/CANTX1/SPI0_NPCS2

65

PD13/GCOL/SDA10

62

PD14/GRXCK/SDCKE

59

PD15/GTX2/RXD2/NWR1/NBS1

75

PD16/GTX3/TXD2/RAS

56

PD17/GTXER/SCK2/CAS

53

PD18/NCS1/SDCS/RTS2/URXD4

49

PD19/NCS3/CTS2/UTXD4

47

PD20/PWMC0_PWMH0/SPI0_MISO/GTSUCOMP

45

PD21/PWMC0_PWMH1/SPI0_MOSI/TIOA11

43

PD22/PWMC0_PWMH2/SPI0_SPCK/TIOB11

41

PD24/PWMC0_PWML0/RF/TCLK11

37

PD25/PWMC0_PWML1/SPI0_NPCS1/URXD2

35

PD26/PWMC0_PWML2/TD/UTXD2

36

PD27/PWMC0_PWML3/SPI0_NPCS3/TWD2

32

PD28/URXD3/CANRX1/TWCK2

51

PD30/UTXD3

23

PD31/QIO3/UTXD3/PCK2

2

HSDP

95

HSDM

94

NRST

58

TST

60

JTAGSEL

73

V

REFP

9

V

REFN

6

VBG

97

U4A

UTIL_SDA

UTIL_SCL

ERASE

VPP_ON

VPP_GND

4.7k
0402
1%

R23

4.7k
0402
1%

R24

3V3

VDD_GND

PKOB4_SWDIO
PKOB4_SWCLK

PKOB4_TDO

DATA_EN

CLK_EN

PG_SYSTEM

((U)PDI_RXD1)

PDI_SCK1

((U)PDI_TXD1)

(TAUX_TAR)

(SPI0_NPCS0)

D_P

D_N

PKOB4_nRST

ICSP_SPI0_SPCK

ICSP_SPI0_MOSI

ICSP_SPI0_MISO

(ICSP_SDO)

(ICSP_SDI)

(ICSP_SCK)

(TDI_IN)
(TMS_IN)
(TAUX_IN)

MOSI
SCK

MISO

SCK_IN

CLK_EN
DATA_EN

ICSP™

ICSP

ISP_SPI1_MOSI

(TDI_TAR)

ISP_SPI1_SPCK

(SCK_IN)

SPI1_NPCS0

(TMS_TAR)

5.62k
0402
1%

R25

3V3

USB_VBIAS

STATUS

ACTIVE

TVDD_GOOD

ICSP_FORCE_SPI_SS

CTS0_SPI1_SS

ISP_SPI_SS

5V0_nUSBFLT

5V0_USBGOOD

TAUX_DIR

TDI_DIR

TMS_DIR

DW_TX

DW_RX

(DW_RX)

STRONG_PULLUP_EN

XIN

ISP_SPI1_MISO

PDI_RXD1

PDI_TXD1

TIOA0

PKOB4_REV0
PKOB4_REV1
PKOB4_REV2
PKOB4_REV3
PKOB4_REV4

3V3

DATA_EN

DGI_I2C_SCL

DGI_I2C_SDA

DGI_IO1

DGI_IO0

DGI_IO2
DGI_IO3

ISP_SPI1_SPCK

SYS_ID1

SYS_ID2

SYS_ID4

SYS_ID3

DGI_IO3_DIR
DGI_IO2_DIR
DGI_IO1_DIR

DGI_IO0_DIR

CLK_EN

ICSP_SPI0_SPCK

ICSP_SPI0_MOSI

ICSP_SPI0_MISO

STREAM_TXD2

STREAM_RXD2

STREAM_SCK2

VBUS_DETECT

VCP_UART_TX

VCP_UART_RX

VCP

VCP

ATSAME70N21B-ANT

V

DDOUT

4

V

DDIN

5

V

DDIO

19

V

DDIO

28

V

DDIO

68

V

DDIO

81

V

DDCORE

18

V

DDCORE

22

V

DDCORE

39

V

DDCORE

76

V

DDPLL

86

V

DDUTMII

93

V

DDUTMIC

96

V

DDPLLUSB

90

GND

3

GND

7

GND

8

GND

10

GND

29

GND

67

U4B

Vൽൽർඈඋൾ

3V3

3V3

Vൽൽർඈඋൾ

FB1

Vൽൽർඈඋൾ

3V3

FB2

4.7 μF
0603
16V

C34

3V3 Vൽൽർඈඋൾ

Vඌඌඑ඗ Bypass Caps Vඌඌඋ඗කඍ Bypass Caps

XIN

24LC256

A0

1

SDA

5

A2

3

A1

2

WP

7

V

SS

4

SCL

6

V

CC

8

U2

3V3

UTIL_SCL

UTIL_SDA

DNP

1
2

J4

3V3

ERASE

4.7 μF
0603
16V

C38

3V3

16V
1 μF
0603

C27

XIN

D_P
D_N

3V33V3

SWD

3V3

3V3

(TDI_PGD)

(TAUX)

(TDO_SWO)

(NMCLR)

(VDD_VIOREF)

(TMS_SWDIO)

DNP

1
2
3
4
5
6
7
8

J5

(TCK_PGC_SWDCLK)

100k
0402
1%

R26

100k
0402
1%

R27

100k
0402
1%

R28

PKOB4_SWDIO

PKOB4_SWCLK

PKOB4_nRST

PKOB4_TDO

PKOB4_nRST

UTIL_SDA
UTIL_SCL

3V3

31.6k
0402
1%

R43

TVDD_GOOD

47k
0402
1%

R44

ERASE

10k
0402

1%

R31

3V3

10k
0402
1%

R29

3V3

31.6k
0402

1%

R45

47k
0402
1%

R46

VBUS_DETECT

VBUS_DETECT

CLK_EN

DATA_EN

74LVC1G3157

B2

1

GND

2

B13A

4

V

CC

5

S

6

U3

ICSP_FORCE_SPI_SS

SPI1_NPCS0

CTS0_SPI1_SS

ISP_SPI_SS

3V3

PKOB4_SWCLK

PKOB4_SWDIO

PKOB4_TDO

5V

0.1 μF
25V
0603

C14

0.1 μF
25V
0603

C16

0.1 μF
25V
0603

C17

0.1 μF
25V
0603

C18

0.1 μF
25V
0603

C19

0.1 μF
25V
0603

C20

0.1 μF
25V
0603

C24

0.1 μF
25V
0603

C25

0.1 μF
25V
0603

C41

0.1 μF
25V
0603

C37

0.1 μF
25V
0603

C36

0.1 μF
25V
0603

C35

0.1 μF
25V
0603

C32

0.1 μF
25V
0603

C40

10k
0402
1%

R155

0.5A
1210

TH1

PKoB Revision 1
Reserved for PKOB4

FIGURE A-7: SCHEMATICS PAGE 7 OF 8

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

 2020 Microchip Technology Inc. DS50002927A-page 51

74LVC1T45GW

DIR

5

A

3

B

4

GND

2

V

CCA

1

V

CCB

6

U6

3V3

330R

0402 1%

R34

330R

0402 1%

R35

74LVC1T45GW

DIR

5

A

3

B

4

GND

2

V

CCA

1

V

CCB

6

U7

3V3

330R

0402 1%

R36

CLK_EN

DATA_EN

330R

0402 1%

R37

22R
0603
1%

R41

22R
0603
1%

R40

MOSI

SCK

MISO

SCK_IN

CLK_EN

DATA_EN

ICSP

ICSP

ICSP_SPI0_SPCK

ICSP_SPI0_MOSI
ICSP_SPI0_MISO

ISP_SPI1_SPCK

ICSP_SPI0_MOSI

ICSP_SPI0_MISO

ICSP_SPI0_SPCK

(ICSP_SCK)

(SCK_IN)

(ICSP_SDO)

(ICSP_SDI)

ISP_SPI1_SPCK

4.7k
0402
1%

R38

4.7k
0402
1%

R39

Vඉඉ/MCLR

DATA_EN

CLK_EN

3.3k
0402
1%

R32

3.3k
0402
1%

R33

VPP_ON

74LVC1T45GW

DIR

5

A

3

B

4

GND

2

V

CCA

1

V

CCB

6

U8

1k
0603
1%

R42

3V3

PGC

PGD

10k
0402
1%

R30

Target ICSP™ Signals

PICkit™ On-Board 4 (buffers)

CLK_EN

DATA_EN

0.1 μF
25V
0603

C45

0.1 μF
25V
0603

C26

0.1 μF
25V
0603

C29

0.1 μF
25V
0603

C42

0.1 μF
25V
0603

C44

0.1 μF
25V
0603

C43

10k
0402
1%

R51

0R
0805

R48

0R
0805

R47

3V3

3V3

3V3

3V3

+3.3V

DGND

Power Supply Connection – PKOB

0R

R49

DEBUG_RX

0R

R50

DEBUG_TX

VCP_UART_TX

VCP_UART_RX

VCP

VCP

MCLR

To Application Vඉඉ/MCLR

FIGURE A-8: SCHEMATICS PAGE 8 OF 8

To Application PGD

To Application PGC

Schematics and Layout

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

FIGURE A-9: TOP LAYER: TOP SILK AND TOP COPPER

FIGURE A-10: MID LAYER -1: COPPER

DS50002927A-page 52  2020 Microchip Technology Inc.

FIGURE A-11: MID LAYER -2: COPPER

Schematics and Layout

FIGURE A-12: BOTTOM LAYER: BOTTOM SILK AND BOTTOM COPPER

 2020 Microchip Technology Inc. DS50002927A-page 53

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

NOTES:

DS50002927A-page 54  2020 Microchip Technology Inc.

Appendix B. Electrical Specifications

B.1 INTRODUCTION

This section provides the electrical specifications for the dsPIC33CK Low-Voltage
Motor Control Board User’s Guide (see Table B-1).

dsPIC33CK LOW-VOLTAGE

MOTOR CONTROL BOARD

USER’S GUIDE

TABLE B-1: ELECTRICAL SPECIFICATIONS

Parameter Operating Range

Input DC Voltage 12-48V

Absolute Maximum Input DC Voltage 55V

Maximum Input Current through Connector J1 2.5A

Maximum Input Current through Connector J2 24A

Continuous Output Current per Phase @ +25°C 10A (RMS)

Note 1: At an ambient temperature (+25°C), the Motor Control Board remains within

thermal limits when operating with continuous output currents of up to 10A (RMS)
while operating in the permissible voltage range.

2: At an ambient temperature (+25°C), it is possible to increase the continuous per

phase output current delivery up to 20A (RMS) by an appropriate level of forced air
cooling using a fan.

3: When spinning the motor under certain conditions (field weakening or restarting of

motor with inertia load while coasting down, direction reversal when motor is spin­ning at higher speed), this may cause the DC bus voltage to rise beyond the
applied input DC voltage (if the DC power supply is non-receptive). Under such
conditions, ensure that the input DC voltage does not exceed the specified
‘Absolute Maximum Input DC Voltage’ (refer to Ta bl e B -1 ). Failure to ensure the DC
voltage will cause permanent damage to the Motor Control Board.

(1,2,3)

 2020 Microchip Technology Inc. DS50002927A-page 55

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

NOTES:

DS50002927A-page 56  2020 Microchip Technology Inc.

Appendix C. Design Details

Filter,

Feedback and

Bias Circuit

Filter,

Feedback and

Bias Circuit

Filter,

Feedback and

Bias Circuit

dsPIC33CK256MP508

IB

IA

IBUS

VREF

VREF

VREF

SHUNT_IBUS_N

SHUNT_IBUS_P

SHUNT_IB_N

SHUNT_IB_P

SHUNT_IA_N

SHUNT_IA_P

Op Amp 2

Op Amp 1

A

B

C

D

E

F

U9

A

B

C

A

B

C

E

D

D

E

16

F

F

20

18

41

45

43

23

29

28

Op Amp 3

C.1 INTRODUCTION

This chapter provides design details of the:

• Current Amplifier Circuits

• Auxiliary Power Supply

C.2 CURRENT AMPLIFIER CIRCUITS

Circuits used for amplifying motor phase currents and DC bus current using internal
amplifiers of the dsPIC33CK256MP508 are shown in Figure C-1. Circuits used for
amplifying motor phase currents and DC bus current using external amplifiers U5-A,
U5-B, U5-C and U15 are shown in Figure C-2. The detailed schematics of the block
“Filter, Feedback and Bias Circuit” used in Figure C-1 and Figure C-2 are shown in

Figure C-3.

dsPIC33CK LOW-VOLTAGE

MOTOR CONTROL BOARD

USER’S GUIDE

FIGURE C-1: dsPIC

®

DSC INTERNAL AMPLIFIERS

 2020 Microchip Technology Inc. DS50002927A-page 57

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

Filter,

Feedback and

Bias Circuit

Filter,

Feedback and

Bias Circuit

Filter,

Feedback and

Bias Circuit

MCP6024

IB_EXT

IA_EXT

IC_EXT

VREF

VREF

VREF

SHUNT_IC_N

SHUNT_IC_P

SHUNT_IB_N

SHUNT_IB_P

SHUNT_IA_N

SHUNT_IA_P

Op Amp B

Op Amp A

A

B

D

E

F

U5

A

B

C

A

B

C

E

D

E

1

F

F

3

2

7

5

6

8

10

9

Op Amp C

Filter,

Feedback and

Bias Circuit

IBUS_EXT

VREF

SHUNT_IBUS_N

SHUNT_IBUS_P

F

A

B

CD

E

1

3

4

MCP651S

U15

FIGURE C-2: EXTERNAL CURRENT AMPLIFIERS (U5, U15)

C

D

DS50002927A-page 58  2020 Microchip Technology Inc.

Design Details

C2

RIN

RIN

C1

C2

R

F

RF

RIN

RIN

A

B

C

D

E

F

R

IN2

R

IN1

R

IN1

R

IN2

Differential Amplifier Gain =

Rf

(R

IN1

+ R

IN2

)

Differential-mode f

–3dB



1

2(R

IN1

+ R

IN2

)

C2

2

+ C1







Common-mode f

–3dB



1

2(R

IN1

)(C2)

FIGURE C-3: FILTER, FEEDBACK AND BIAS CIRCUIT

Equation C-1 provides the amplifier gain calculations. Equation C-2 and Equation C-3

provide the equations to calculate cutoff frequencies of the Differential-mode and
Common-mode filters.

EQUATION C-1: AMPLIFIER GAIN

EQUATION C-2: CUTOFF FREQUENCY DIFFERENTIAL-MODE FILTER

EQUATION C-3: CUTOFF FREQUENCY COMMON-MODE FILTER

 2020 Microchip Technology Inc. DS50002927A-page 59

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

Ta bl e C - 1 summarizes the amplifier gain and peak currents for various values of RF.

The customer can select different values, based on application requirements, ensuring
peak current is within the board operating range.

TABLE C-1: EXAMPLE CONFIGURATION – AMPLIFIER GAIN VS. PEAK

CURRENT

Table Summarizes Amplifier Gains and Peak Currents for Various Values of RF when
R

IN1 = 62R, RIN2 = 470R, RSHUNT = 0.01R

F Amplifier Gain

R

20.0 k 37.593 4.389 Amps Peak ERA-3AEB203V

10.0 k 18.796 8.778 Amps Peak ERA-3AEB103V

6.65 k 12.5 13.2 Amps Peak ERA-3AEB6651V

4.99 k 9.379 17.59 Amps Peak ERA-3AEB4991V

4.02 k 7.556 21.83 Amps Peak ERA-3AEB4021V

Peak Current @

1.65V

Rf Resistor Part Number

(use below part number

or similar)

DS50002927A-page 60  2020 Microchip Technology Inc.

C.3 AUXILIARY POWER SUPPLY

VIN

+12V

+12V Output

DC-DC

Converter

(MIC28511)

PGND

+5V

+5V Output

DC-DC

Converter

(MCP16301)

DGND

+3.3 VA

+3.3V Output

LDO

(MCP1826)

AGND

+3.3V

DGND

Auxiliary Power Supply

PGND

V

DD

19

PV

DD

20

PV

IN

7

PV

IN

8

PV

IN

9

V

IN

17

FREQ

24

EN

16

DL (NC)

1

DH (NC)

3

SW

12

SW

21

(EPAD3) SW

27

LX

5

PV

IN

4

PVIN (EPAD1)

25

BST

6

I

LIM

18

FB

14

PGOOD

15

AGND

13

PGND

2

PGND

10

PGND

11

PGND

22

PGND

23

(EPAD2) PGND

26

MIC28511

U1

0.1 μF

C2

0.1 μF

C6

100k

R3

PGND

+12V

1.21R

R2

2.2 μF

C1

2.2 μF

C3

100k

R8

100k

R7

DNP

R11

1.21R

R5

2.2 μF

C15

22 μF

C13

BAT46W

D1

10R

R1

DNP

C4

PGND

100 μH

L1

47 μF

C7

2.2 μF

C8

715R

R10

3300 pF

C5

0.1 μF

C22

PGND

1k

R4

PGND

0.1 μF

C30

10k

R6

10k

R9

V

IN

The auxiliary power supply circuit consists of the following three stages (see

Figure C-4):

• +12V Output Power Supply

• +5V Output Power Supply

• +3.3V Output Power Supply

FIGURE C-4: AUXILIARY POWER SUPPLY

Design Details

C.3.1 +12V Output Power Supply

The +12V output power supply is a synchronous buck converter (see Figure C-5)
based on MIC28511. This power supply stage has the following specifications:

• Input Voltage (V

• Output Voltage (labeled as ‘+12V’) = +12V

FIGURE C-5: +12V POWER SUPPLY CIRCUIT

 2020 Microchip Technology Inc. DS50002927A-page 61

IN) Range = +14V to +48V

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

0.8  R6

V

OUT – VFB

0.8  10k

11.2V

=  714.3

(ICLIM – IL(PP)  0.5)  R

DS-ON

+ VCL

ICL

(2A – 0.2 0.5) 28 m + 14 mV

70 µA

= = 960

(VINMAX – VOUT) 

IL ILMAX F

SW

= = 88.23 µH

V

OUT

VINMAX

(60V – 12V) 

0.2 0.8A kHz

12V
60V

100 µH  (0.8A +

(12 + 0.1)

2

– (12)

2

== 32 µF

0.8A 0.2

2

100 µH  (0.88)

2

(12.1)2 – (12)

2

L  IPK

2

(VOUT + VOUT)2 – VOUT

2

)

2

=

The major components of the +12V supply are:

• The capacitors, C13 and C15, are the input supply capacitors of the +12V power
supply stage.

• The EN pin of the MIC28511 has an on-board 100 k pull-up resistor (R8) to V
which allows the output to be turned on when PV

• The switching frequency of the converter is set by the resistors, R7 and R11.
When R11 is not populated, the switching frequency will typically be 680 kHz, as
is the case in this Motor Control Board. The resistor R7 is selected as 100 k.

• The output is determined by resistors, R6 and R10, where V
V

FB = 0.8V and R6 = 10k. Then, R10 is calculated as:

DD exceeds its UVLO threshold.

OUT = +12V,

IN,

• The MIC28511 uses the R

and a resistor connected from ILIM to the SW node

DS-ON

to decide the current limit. The current limit resistor R4 value is calculated as:

• The Power Good (PGOOD) pin is an open-drain output, which is pulled up with a
10 kΩ resistor (R9) to V

DD. This indicates a logic high when the output is

nominally 90% of its steady-state voltage.

• The bootstrap circuit, the diode D1, resistor R2 and capacitor C2. This circuit
supplies energy to the high-side drive circuit. In the Motor Control Board, D1 is
selected as BAT46W, R2 is set as 10Ω and C2 is selected as 0.1 µF to hold a
charge for approximately 1.25 µSec.

• In order to have some amount of voltage ripple at the voltage feedback pin, a
ripple injection method is applied for low output voltage ripple applications. In the
Motor Control Board, components C5 (3300 pF), R3 (100k) and C6 (0.1 µF) are
used for this purpose.

• The output stage of the synchronous buck converter is comprised of an inductor
and capacitor. In this case, inductor L1 and capacitors, C7 and C2, are the output
inductor and capacitor.

- The minimum value of the inductance at maximum input voltage (i.e., 60V),

considering 20% ripple current is as follows:

DS50002927A-page 62  2020 Microchip Technology Inc.

- The minimum value of the output capacitance can be calculated based on the

selected output inductance L1 (100 µH), which is:

In the Motor Control Board, output capacitors, C7 and C2, are set as 47 µF and

2.2 µF; setting total output capacitor value as greater than the calculated value.

For additional information and recommendations, refer to the “MIC28511 – 60 V

3A Synchronous Buck Regulator Data Sheet” (DS20005520) and “MIC28511-1YFL
Evaluation Board User’s Guide”.

IN,

Design Details

DCLOCAL

CIN

MCP16301

V

IN

EN

GND

BOOST

SW

V

FB

DB

RBOOST CB

VBUCK

COUT

RTOP1

RBOT1

D

R

SNU

CSNU

L

R

TOP1

= R

BOT1



V

BUCK

V

FB

– 1







K = V

BUCK

/L

C.3.2 +5V Output Power Supply

The +5V output power supply is a buck converter (see Figure C-6) based on
MCP16301. This power supply stage has the following specifications:

• Input Voltage (V

• Output Voltage (labeled as ‘+5V’) = +5V

FIGURE C-6: +5V POWER SUPPLY

IN) = +12V

The component values used in this circuit are listed in Ta b le C - 2,and were chosen
using Equation C-4 with V

BUCK = +5V, VFB = 0.8V and K = 0.22V/H.

EQUATION C-4:

TABLE C-2: +5V POWER SUPPLY COMPONENT VALUES

Label Component Designator Component Value

R

BOT1 R18 10k

TOP1R14 52.5k

R

LL222 µH

RBOOST R13 82R

B C39 01. µF

C

C

IN C23, C31 20 µF

OUT C100 10 µF

C

SNU R17 4.7R

R

C

SNU C33 120 pF

 2020 Microchip Technology Inc. DS50002927A-page 63

dsPIC33CK Low-Voltage Motor Control Board User’s Guide

I

D(AVG)

=

V

BUCK

DC

LOCAL

1 –







 I

OUT

A low forward drop Schottky diode is used for free-wheeling diode D. The average
diode current is calculated using Equation C-5. Based on these calculations, a
MBRA140T3G Schottky diode is selected.

EQUATION C-5:

A standard 1N4148 ultra-fast diode for boost diode D

B was selected based on

recommendations from the “MCP16301/H High-Voltage Input Integrated Switch
Step-Down Regulator Data Sheet” (DS20005004). For more information about the
snubber circuits, R

SNU and CSNU, and series boost resistor, RBOOST, refer to AN1466,

“Reduction of the High-Frequency Switching Noise in the MCP16301 High-Voltage
Buck Converter” (DS01466) application note.

C.3.3 +3.3V Output Power Supply

The second stage of the power supply has the following specifications:

• Input Voltage = +5.0V

• Output Voltage 1 (+3.3V and +3.3 VA) = +3.3V

The MCP1826 LDO is used for generating the +3.3V output. The input of the +3.3V
LDO is the output of the +5V Converter. In the Motor Control Board, digital supply +3.3V
and analog supply +3.3 VA (see Figure C-7) are separated by the jumper resistor R15.
Similarly, Digital Ground (DGND) and Analog Ground (AGND) are separated by the
jumper resistor R19. This is done to logically divide supply lines to analog and digital
circuits during the board layout design.

DS50002927A-page 64  2020 Microchip Technology Inc.

FIGURE C-7: +3.3V POWER SUPPLY

V

IN

V

OUT

+5V

C100
10 µF

C101
10 µF

C102

0.1 µF

C103

0.1 µF

C104
10 µF

C105
10 µF

C106

0.1 µF

V

IN

V

OUT

GND

U12

MCP1826S/3.3V

13

2

DGND

R19

0R
0805

AGND

+3.3V +3.3 VA

R15

0R
0805

Design Details

 2020 Microchip Technology Inc. DS50002927A-page 65

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DS50002927A-page 66  2020 Microchip Technology Inc.

05/14/19