Freescale Semiconductor 33395 Reference Manual

ANALOG ICs

33395 EVALUATION
MOTOR BOARD
DESIGNER REFERENCE
MANUAL

Rev. 2
05/2003

Communicate

Control

Protect

EMBEDDED MOTION CONTROL

MC33395RM

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

List of Sections 1

33395 Evaluation Motor Board

List of Sections

Section 1. Introduction and Setup .................................... 9

Section 2. Operational Description ................................. 15

Section 3. Pin Descriptions..............................................17

Section 4. Schematics and Parts List ............................. 25

Section 5. Design Considerations ..................................37

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

2 List of Sections

List of Sections

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Table of Contents 3

33395 Evaluation Motor Board

Table of Contents

Section 1. Introduction and Setup

1.1 Contents .....................................................................................9

1.2 SMOS EVM Motor Board Introduction........................................ 9

1.3 About This Manual...................................................................... 9

1.4 Warnings ..................................................................................12

1.5 Setup Guide.............................................................................. 13

Section 2. Operational Description

2.1 Contents ...................................................................................15

2.2 Introduction...............................................................................15

2.3 Electrical Characteristics ..........................................................16

Section 3. Pin Descriptions

3.1 Contents ...................................................................................17

3.2 Introduction...............................................................................17

3.3 Signal Descriptions...................................................................19

3.3.1 Power Connectors J3 and JP4............................................ 19

3.3.2 40-Pin Ribbon Connector J1 ............................................... 19

3.3.3 Output Connectors: J2, J4, FASTONS (J5, J7, J8)............. 22

3.3.4 Jumpers and Switch/Push Button: M0, M1, PWM, SW1.....22

3.3.5 Test Points ..........................................................................24

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

4 Table of Contents

Table of Contents

Section 4. Schematics and Parts List

4.1 Contents ...................................................................................25

4.2 Overview................................................................................... 25

4.3 Schematics ...............................................................................25

4.4 Parts List................................................................................... 32

Section 5. Design Considerations

5.1 Contents ...................................................................................37

5.2 Overview................................................................................... 37

5.3 3-Phase H-Bridge .....................................................................37

5.4 Bus Voltage and Current Feedback Signals.............................38

5.5 Back-EMF Signals ....................................................................40

5.6 Brake Control............................................................................41

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

List of Figures 5

33395 Evaluation Motor Board

List of Figures

Figure Title Page

1-1 System Configurations..............................................................10

1-2 SMOS EVM Motor Board ver. 140A01 ..................................... 11

1-3 SMOS EVM Motor Board Setup ............................................... 14

3-1 40-Pin Input Connector J1 ........................................................ 18

4-1 SMOS EVM Motor Board ver. 140A01 Overview ....................26

4-1a SMOS EVM Motor Board ver. 140A02 Overview ....................27

4-2 3-Phase H-Bridge with Gate Driver ..........................................28

4-3 Current Feedback Circuits ........................................................29

4-4 Back-EMF Signals .................................................................... 30

4-5 Brake Control............................................................................31

4-6 Brushless DC Motor Connections - Schematic View................31

5-1 Phase Current and DC Bus Voltage Sensing ...........................39

5-2 Reconstructed Bus Current ......................................................40

5-3 Phase C Back-EMF Feedback ................................................. 40

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

6 List of Figures

List of Figures

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

List of Tables 7

33395 Evaluation Motor Board

List of Tables

Table Title Page

2-1 Electrical Characteristics ..........................................................16

3-1 Connector J1 Signal Descriptions ............................................19

3-2 Connectors J2 and J4 Signal Descriptions ............................... 22

3-3 Driver Jumper Groups for Operating Mode .............................. 22

3-4 Gate Driver PWM Signal Selection ...........................................23

3-5 Test Points ...............................................................................24

4-1 Parts List...................................................................................32

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

8 List of Tables

List of Tables

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Introduction and Setup 9

33395 Evaluation Motor Board

Section 1. Introduction and Setup

1.1 Contents

1.2 SMOS EVM Motor Board Introduction........................................9

1.3 About This Manual......................................................................9

1.4 Warnings ..................................................................................12

1.5 Setup Guide..............................................................................13

1.2 SMOS EVM Motor Board Introduction

Freescale SMARTMOSTM 33395 evaluation motor board
(SMOS EVM motor board) is a 12-volt, 8-amp power stage that is an
integral part of Freescale embedded motion control series of
development tools. It is also supplied as a kit. In combination with one of
the embedded motion-control series control or evaluation boards, it
provides a ready-made development platform for brushless dc motors.
The motor can be controlled using Hall sensors, an optical encoder or
sensorless techniques. An illustration of system configurations is shown
in Figure 1-1. Figure 1-2 depicts the board layout.

1.3 About This Manual

Key items can be found in the following locations in this manual:

• Setup instructions are found in chapter 1.5.

• Schematics are found in chapter 4.3.

• Pin assignments are shown in Figure 3-1, and a pin-by-pin
description is contained in chapter 3.3.

• For those interested in the reference design aspects of the board’s
circuitry, a description is provided in Section 5.

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

10 Introduction and Setup

Introduction and Setup

Figure 1-1 System Configurations

HC08

CONTROLLER

BOARD

SMOS EVM

MOTOR BOARD

MOTOR

WORKSTATION

MMDS08

DSP
EVM

BOARD

SMOS EVM

MOTOR BOARD

MOTOR

WORKSTATION

b) 56800(E) DSPa) MC68HC(9)08MR MICROCONTROLLER

OPTIONAL FEEDBACKOPTIONAL FEEDBACK

Introduction and Setup

About This Manual

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Introduction and Setup 11

Figure 1-2 SMOS EVM Motor Board ver. 140A01

MOTOR CONNECTORS

POWER SUPPLY CONNECTORS

TRIMMER

JUMPERS AND SWITCH

UNI-3
CONNECTOR

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

12 Introduction and Setup

Introduction and Setup

1.4 Warnings

The SMOS EVM motor board kit includes a rotating machine and power
transistors. Both can reach temperatures hot enough to cause burns! To
facilitate safe operation, 12-volt input power should come from a dc
laboratory power supply that is current limited to no more than 10 amps.

The user should be aware that:

• Before moving scope probes, making connections, etc., it is
generally advisable to power down the 12-volt supply.

• Standalone operation of the board should be allowed only with use
of an insulative pad or standoffs as shown in Figure 1-3.

• Wearing safety glasses, avoiding neckties and jewelry, using
shields, and operation by personnel trained in power electronics
lab techniques are also advisable.

Introduction and Setup

Setup Guide

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Introduction and Setup 13

1.5 Setup Guide

Setup and connections for the SMOS EVM motor board are
straightforward. The SMOS EVM motor board connects to a Freescale
embedded motion control series control board via a 40-pin ribbon cable.
The motor’s power leads plug into one of the output connectors J2 or J4
or FASTON type (J5 J7 J8). Figure 1-3 depicts a completed setup with
control board or module.

Follow these steps to set up the board:

1. Mount 4 standoffs to the SMOS EVM motor board at the locations
indicated in Figure 1-3. Step 1 and step 3 are optional when making
connections to DSP control boards such as the DSP56F8xxEVM that
can be placed flat on a bench next to the SMOS EVM motor board.

2. Plug one end of the 40-pin ribbon cable that is supplied with Freescale
embedded motion control series control boards into input connector J1,
located on the right-hand side of the motor board, considering its ‘default
front view’ position as in Figure 1-2. The other end of this cable links to
the control board’s 40-pin output connector.

3. Mount the control board on top of the standoffs with screws and
washers. This step is optional with DSP control boards.

4. Connect a 12-Vdc power supply either to connector J3 or power jack
JP4, labeled “Power 12V”. Either one, but not both, can be used. These
connectors are located on the front left-hand corner of the board. The
12-volt power supply should be rated to match the motor current.

5. Apply power to the SMOS EVM motor board. The green power-on LED
lights when the voltage supply is present. Note that the SMOS EVM
motor board powers the control board as well.

CAUTION: Since the control board is powered by the SMOS EVM motor board,

it is imperative that only one power supply is used!

6. Temperature, under-voltage or over-voltage faults, or externally sensed
bus current overflow disables the gate driver. Board reset is needed.
Either switch the power supply off and on or provide a ‘soft reset’. To
provide the soft reset on the 140A01 board version, toggle the SW1
switch from position 3 to 2; on the 140A02 version, press the RESET
button. Refer to chapter

3.3.4 to verify the jumper positions.

NOTE: Check if the trimmer tagged in Figure 1-2 is set to <2.45V (between

bottom trimmer pin-2, R131 label, and GNDA) which thresholds the dc
bus current to 10 amps. The closer its value is set to 1.65V, the smaller
the bridge current is that can flow.

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

14 Introduction and Setup

Introduction and Setup

Figure 1-3 SMOS EVM Motor Board Setup

MOTOR

56800(E)

SMOS EVM

40-PIN
RIBBON CABLE

STANDOFF

12-VOLT

MOTOR SUPPLY

STANDOFF

MOTOR BOARD

EVALUATION MODULE

OR

HC08 CONTROL BOARD

STANDOFFS

OR

HCS12 CONTROL BOARD

OR

MPC EVALUATION MODULE

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Operational Description 15

33395 Evaluation Motor Board

Section 2. Operational Description

2.1 Contents

2.2 Introduction...............................................................................15

2.3 Electrical Characteristics ..........................................................16

2.2 Introduction

Freescale embedded motion control series SMOS EVM motor board is
a 12-volt, 8-amp, surface-mount power stage with an analog SMOS
driver. In combination with one of the embedded motion control series
control boards, it provides a development platform that allows algorithms
to be written and tested without the need to design and build a power
stage. It supports algorithms that use Hall sensors, encoder feedback,
and Back-EMF (electromotive force) signals for sensorless control.

The SMOS EVM motor board has an over-current protection that is
independent of the control board, yet some care in its setup and use is
required for board or motor protection. Current-measuring circuitry is set
up for 8 amps full scale, according to trimmer position. A 25°C ambient
temperature operation with output current up to 10 amps of continuous
RMS value is within the board’s thermal limits. Note that there is no
thermal protection provided on the board.

Input connections are made via a 40-pin ribbon cable connector J1. Pin
assignments for the input connector are shown in Figure 3-1. Power
connections to the motor are made on one of the output connectors J2
or J4 or FASTON type (J5 J7 J8). Phase A (J8), phase B (J7), and phase
C (J5) are labeled on the board, the phase pin order for all three
connector types is identical. Power requirements are met by a single
external 12-Vdc power supply. Two connectors, labeled J3 and JP4, are

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

16 Operational Description

Operational Description

provided for the 12-volt power supply; they are located on the front edge
of the board. Power is supplied to one or the other, but not both.

A summary of the information needed to use the SMOS EVM motor
board follows. For design information, see Section 5.

2.3 Electrical Characteristics

The electrical characteristics in Table 2-1 apply to operation at 25°C and
a 12-Vdc power supply voltage.

Table 2-1 Electrical Characteristics

Characteristic Symbol Min Typ Max Units

Power Supply Voltage Vdc 10.2 12 16 V

Quiescent Current I

CC

—70—mA

High State Logic 1 Input Voltage V

IH

2.4 3.3 or 5 7 V

Low State Logic 0 Input Voltage V

IL

— < 0.4 0.8 V

Input Resistance R

In

—10—k!

Analog Output Range V

Out

0—3.3V

Phase Current Sense Voltage I

Sense

—172—mV/A

Bus Voltage Sense Voltage V

Bus

—206—mV/V

Power MOSFET On Resistance R

DS(On)

—1016m!

RMS Output Current I

M

——10A

Total Power Dissipation P

diss

——18W

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Pin Descriptions 17

33395 Evaluation Motor Board

Section 3. Pin Descriptions

3.1 Contents

3.2 Introduction...............................................................................17

3.3 Signal Descriptions...................................................................19

3.3.1 Power Connectors J3 and JP4............................................19

3.3.2 40-Pin Ribbon Connector J1 ...............................................19

3.3.3 Output Connectors: J2, J4, FASTONS (J5, J7, J8).............22

3.3.4 Jumpers and Switch/Push Button: M0, M1, PWM, SW1.....22

3.3.5 Test Points ..........................................................................24

3.2 Introduction

Inputs and outputs are located on six board connectors depicted in

Figure 1-2:

• There are three motor connectors conducting identical output
signals, however only one motor can be connected at run time to
one of these connectors.

• There are two power supply connectors which introduce identical
input signals, however only one power supply can be plugged in
at run time to one of these connectors.

• One connector (UNI-3) is associated with the controller board.

In addition, many test points are located on the SMOS EVM motor board.

Pin descriptions for each of these connectors and the test points are
identified in the following information. Pin assignments for the input and

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

18 Pin Descriptions

Pin Descriptions

output connectors are shown in Figure 3-1 with their descriptions in

Table 3-1 through Table 3-5.

Figure 3-1 40-Pin Input Connector J1

40
39

38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

BEMF_sense_C

BEMF_sense_B

BEMF_sense_A

Shielding_A

Zero_cross_C

Zero_cross_B

Zero_cross_A

PWM_ctrl
Identification

Brake_control

Shielding_A

I_sense_C

I_sense_B

I_sense_A

I_reconst_DCB

V_sense_DCB

+12V_A

Shielding_A

Shielding_A

+3.3V_A

+5V_D

+5V_D

GND

GND

PWM_CB

Shielding_D

PWM_CT

Shielding_D

PWM_BB

Shielding_D

PWM_BT

Shielding_D

PWM_AB

Shielding_D

PWM_AT

SCHEMATIC VIEW

J1

CON/40

2
4
6

8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40

1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39

Shielding_D

Shielding_D

Shielding_D

Shielding_D

Shielding_D

GND

+5V_D

+3.3V_A

GNDA

I_reconst_DCB

I_sense_B

Shielding_A

Identification

Zero_cross_A

Zero_cross_C

BEMF_sense_A

BEMF_sense_C

PWM_AT

PWM_AB

PWM_BT

PWM_BB

PWM_CT

PWM_CB

GND

+5V_D

GNDA

+12V

V_sense_DCB

I_sense_A

I_sense_C

Brake_control

PWM_ctrl

Zero_cross_B

Shielding_A

BEMF_sense_B

PHYSICAL VIEW

Pin Descriptions

Signal Descriptions

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Pin Descriptions 19

3.3 Signal Descriptions

Pin descriptions are identified in this subsection.

3.3.1 Power Connectors J3 and JP4

Two connectors, labeled J3 and JP4, are provided for the 12-volt power
supply. They are located on the bottom left-hand corner of the board.
Connector J3 is a 2.5-mm power jack for plug-in type 12-volt power
supply connections. Connector JP4 has screw terminal inputs labeled +
(plus) and – (minus), for accepting wire inputs. Power is supplied to one
or the other, but not both. The power supply required parameters
depend on the motor type used. The default output current limit of the
board is 10 amps.

3.3.2 40-Pin Ribbon Connector J1

Signal inputs are grouped together on 40-pin ribbon cable connector J1,
located on the right side of the board. Pin assignments are shown in

Figure 3-1. Pin descriptions are listed in Table 3-1.

Table 3-1 Connector J1 Signal Descriptions (Sheet 1 of 3)

Pin
No.

Signal Name Description

1PWM_AT

PWM_AT is the gate drive signal for the top half-bridge of phase A. A logic high at
input connector J1 turns on the phase A top switch.

2 Shielding_D Pin 2 is connected to a shield wire in the ribbon cable and ground on the board.

3PWM_AB

PWM_AB is the gate drive signal for the bottom half-bridge of phase A. A logic high
at input connector J1 turns on the phase A bottom switch.

4 Shielding_D Pin 4 is connected to a shield wire in the ribbon cable and ground on the board.

5PWM_BT

PWM_BT is the gate drive signal for the top half-bridge of phase B. A logic high at
input connector J1 turns on the phase B top switch.

6 Shielding_D Pin 6 is connected to a shield wire in the ribbon cable and ground on the board.

7PWM_BB

PWM_BB is the gate drive signal for the bottom half-bridge of phase B. A logic high
at input connector J1 turns on the phase B bottom switch.

8 Shielding_D Pin 8 is connected to a shield wire in the ribbon cable and ground on the board.

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

20 Pin Descriptions

Pin Descriptions

9PWM_CT

PWM_CT is the gate drive signal for the top half-bridge of phase C. A logic high at
input connector J1 turns on the phase C top switch.

10 Shielding_D Pin 10 is connected to a shield wire in the ribbon cable and ground on the board.

11 PWM_ CB

PWM_CB is the gate drive signal for the bottom half-bridge of phase C. A logic high
at input connector J1 turns on the phase C bottom switch.

12 GND Digital power supply ground

13 GND Digital power supply ground, redundant connection

14 +5V_D Digital +5-volt power supply

15 +5V_D Digital +5-volt power supply, redundant connection

16 +3.3V_A Analog +3.3-volt power supply

17 GNDA Analog power supply ground

18 GNDA Analog power supply ground, redundant connection

19 +12V +12-volt power supply

20 — No connection

21 V_sense_DCB

V_sense_DCB is an analog sense signal that measures dc bus voltage. It is scaled
at 0.206 volts per volt of dc bus voltage.

22 I_reconst_DCB

I_reconst_DCB is an analog sense signal that measures dc bus current. It is scaled
at 0.172 volts per amp of dc bus current.

23 I_sense_A

I_sense_A is an analog sense signal that measures current in phase A. It is scaled
at 0.172 volts per amp of dc bus current.

24 I_sense_B

I_sense_B is an analog sense signal that measures current in phase B. It is scaled
at 0.172 volts per amp of dc bus current.

25 I_sense_C

I_sense_C is an analog sense signal that measures current in phase C. It is scaled
at 0.172 volts per amp of dc bus current.

26 — No connection

27 — No connection

28 Shielding_A Pin 28 is connected to a shield wire in the ribbon cable and ground on the board.

29 Brake_control Brake_control is the gate drive digital signal for the brake MOSFET.

30 Identification

This is an identification signal that lets the controller know which power stage is
present. It is nominally a 1.5kHz square wave.

Table 3-1 Connector J1 Signal Descriptions (Sheet 2 of 3)

Pin
No.

Signal Name Description

Pin Descriptions

Signal Descriptions

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Pin Descriptions 21

31 PWM_ctrl

This is a gate drive digital signal that is used for power stage board control with use
of just one PWM input signal switching according to gate drive signals PWM_xx

32 — No connection

33 — No connection

34 Zero_cross_A

Zero_cross_A is a digital signal that is used for sensing phase A back-EMF zero
crossing events.

35 Zero_cross_B

Zero_cross_B is a digital signal that is used for sensing phase B back-EMF zero
crossing events.

36 Zero_cross_C

Zero_cross_C is a digital signal that is used for sensing phase C back-EMF zero
crossing events.

37 Shielding _A Pin 37 is connected to a shield wire in the ribbon cable and ground on the board.

38 BEMF_sense_A

BEMF_sense_A is an analog sense signal that measures phase A Back-EMF. It is
scaled at 0.206 volts per volt of dc bus voltage.

39 BEMF_sense_B

BEMF_sense_B is an analog sense signal that measures phase B Back-EMF. It is
scaled at 0.206 volts per volt of dc bus voltage.

40 BEMF_sense_C

BEMF_sense_A is an analog sense signal that measures phase C Back-EMF. It is
scaled at 0.206 volts per volt of dc bus voltage.

Table 3-1 Connector J1 Signal Descriptions (Sheet 3 of 3)

Pin
No.

Signal Name Description

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

22 Pin Descriptions

Pin Descriptions

3.3.3 Output Connectors: J2, J4, FASTONS (J5, J7, J8)

Power output to the motor is located on connectors J2, J4 and
FASTONS (J5, J7, J8). Pin assignments are described in Table 3-2.
FASTON type connectors are labelled with PhA (connector J8) for phase
A, PhB (J7) for phase B, and PhC (J5) for phase C. Phase order is
identical for all three connectors. Note that wire color may vary with
different motor types.

3.3.4 Jumpers and Switch/Push Button: M0, M1, PWM, SW1

The jumper groups M0 (JP2) and M1 (JP3) are used to select the
operating mode of the SMOS gate driver (see Table 3-3). For the truth
table of the driver, see its data sheet.

For selection of the PWM signal brought to the gate driver, the 140A01
board version uses the SW1 rotary switch and the 140A02 version uses
the PWM (JP5) jumper group and RESET (SW1) push button. Both
solutions have the same behavior (see Table 3-4 for an explanation).

When one PWM signal is sent from the controller board to the motor
board through the UNI-3 interface, the SMOS driver must multiplex it
between the three phases according to the mode defined by M0 and M1.
The mode selection is not needed when six PWM signals are generated.

Table 3-2 Connectors J2 and J4 Signal Descriptions

Pin
No.

Signal

Name

FASTON

Pin Name

Description

1 Phase_A J8 Phase_A supplies power to motor phase A.

2 Phase_B J7 Phase_B supplies power to motor phase B.

3 Phase_C J5 Phase_C supplies power to motor phase C.

Table 3-3 Driver Jumper Groups for Operating Mode

MO (JP2) M1 (JP3) Comment

+ position + position High state logic 1

- position - position Low state logic 0 (default)

Pin Descriptions

Signal Descriptions

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Pin Descriptions 23

NOTE: The gate driver ‘soft reset’ is necessary to leave the drive off status that

is not entered by default. When a fault arises or a parallel cable that is
connected between a computer and the controller board introduces an
obscure voltage from this computer into the motor system, the reset
assures correct driver re-initialization. The soft reset is activated either
by toggling the SW1 rotary switch from position 3 to 2 (140A01 board
version), or by resetting with the SW1 push button (140A02 version).
Then the board generates a resetting pulse on the driver PWM_IN pin.

Table 3-4 Gate Driver PWM Signal Selection

SW1 Rotary Switch on

140A01 board

Representation on

140A02 board

Comment

Position 1 (1PWM pin) JP5 jumper uni position

Controller board gives 1
PWM signal

Position 2 (2+ pin) JP5 jumper + position

High state logic 1 (6 PWM
signals, default)

Position 3 (3- pin)

SW1 button press
(RESET)

Resets drive off status
(temporary)

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

24 Pin Descriptions

Pin Descriptions

3.3.5 Test Points

Ten test points provide easy access to the power supply, reference
voltages and other circuits. They are listed in Table 3-5 with their
descriptions and locations. Additional test points appearing left of the
UNI-3 connector are numbered adequately to UNI-3 pin numbers and
explained in Table 3-1.

Table 3-5 Test Points

Point

No.

Signal Name The Test/Measurement point is connected to: Location

1 DCB_POS (MP1) the +12-volt motor bus above green LED diode

2 GND (MP2) the 12-volt power supply and motor bus ground below J2 - motor connector

3 +5V_D (MP3) the 5-volt digital power supply voltage above UNI-3 connector

4 +3.3V_A (MP4) the 3.3-volt analog power supply voltage on top right corner

5 GND (MP5) the 12-volt power supply and motor bus ground

on top left side of UNI-3
connector

6 GNDA (MP6) the analog ground in the middle, above SMOS

7 1.65VREF the 1.65-volt analog reference voltage above MP3, below MP4

8 DCB_HALF Back-EMF zero crossing circuitry right of MP1, below SMOS

9 BRAKE the gate of the brake’s transistor above MP1

10 l_reconst (TP22) pin 22 of UNI-3 connector, see Table 3-1 left of trimmer and MP3

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Schematics and Parts List 25

33395 Evaluation Motor Board

Section 4. Schematics and Parts List

4.1 Contents

4.2 Overview .................................................................................. 25

4.3 Schematics ...............................................................................25

4.4 Parts List................................................................................... 32

4.2 Overview

A set of schematics for the SMOS EVM motor board appears in

Figure 4-1 up to Figure 4-5. An overview of the whole board is

presented in Figure 4-1 (or Figure 4-1a ) . The 3-phase H-bridge,
including gate driver, is depicted in Figure 4-2. Current feedbacks are
presented in Figure 4-3. Back-EMF signals are shown in Figure 4-4.
The brake control is illustrated in Figure 4-5. Brushless dc motor
connections are shown in Figure 4-6.

Unless otherwise specified, resistor values are in ohms, resistors are
specified as 1/8 watt ±5%, and interrupted lines coded with the same
letters are electrically connected.

4.3 Schematics

The schematics for the SMARTMOS evaluation motor board are
rendered on the following pages.

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

26 Schematics and Parts List

Schematics and Parts List

Figure 4-1 SMOS EVM Motor Board ver. 140A01 Overview

PWM_CB

Shielding_A

PWM_BB

PWM_BT

PWM_AB

Brake_control

Zero_cross_C

BEMF_sense_A

Identification

I_sense_A

V_sense_DCB

Shielding_A

Drive r Mode C ontrol J umpers

I_reconst_DCB

PWM_CT

Shielding_D

PWM_ctrl

PWM_AT

BEMF_sense_C

I_sense_B

Shielding_D

I_sense_C

+12V_A

Shielding_D

Shielding_D

Shielding_D

Zero_cross_B

Zero_cross_A

BEMF_sense_B

MODE0

MODE1

3-ph. H-bridge driver

HS E _AT

LS E _AB

P hase _A

P hase _B

P hase _C

HS E _B T

LS E _B B

HS E _C T

LS E _C B

DC B_ Pos _IN

DC B_ Neg

V_ sens e_D CB _ha lf

V_ sens e_D CB

I_s ens e_A2

I_s ens e_A1

I_s ens e_B 1

I_s ens e_B 2

I_s ens e_C 1

I_s ens e_C 2

PW M_I N
MOD E 0
MOD E 1

I_z ero_re f

I_re const_D CBG ND

+5V _D

DC B_ Pos

Bra ke_ control

+3.3 V_A

G NDA

Ba ck EMF

Pha se _B

G NDA

+5V _D

BE MF _s ens e_C

Zero_ cros _C

Zero_ cros _B

Pha se _A

BE MF _s ens e_A

V_ sens e_D CB _ha lf

Pha se _C

Zero_ cros _A

BE MF _s ens e_B

G ND

Identification

C urrent proces sing

I_re const_D CBG NDA

+3.3 V_A

I_s ens e_A2

I_s ens e_A1

I_s ens e_B 1

I_s ens e_B 2

I_s ens e_C 1

I_s ens e_C 2

I_s ens e_A

I_s ens e_B

I_s ens e_C

I_z ero_re f

UN I-24

DC B_ Neg

UN I-21

UN I-35

UN I-9

UN I-29

UN I-36

UN I-11

UN I-1

UN I-22

UN I-23

UN I-7

UN I-19

UN I-25

UN I-30

UN I-34

UN I-3

UN I-5

UN I-38

UN I-31

DC B_ Pos

DC B_ Pos _IN

UN I-39

UN I-40

PW M_H

PW M_H

DC B_ NegDC B_ Neg DC B_ Neg

G ND G NDGND G ND

+5V _D

G NDA G NDA

+5V _D

+3.3 V_A

+5V _D

+5V _D

G ND

G ND

+5V _D

+3.3 V_A

G NDA

G ND

+3.3 V_A

G ND

+3.3 V_A

G NDAG NDA

G NDA

G NDA

G ND

G ND

G NDA

G NDA

G NDA

G NDA

G ND G NDA

G NDA

+5V _D

G ND G ND

+5V _D

+3.3 V_A

G ND G ND

G NDA

J2

AMP 64 0387-3

1

2

3

C 7

100nF

JP 3

S M/JUM PE R 1x3

123

D1

1.5 SM C15 AT3

L1

1mH

U16

MC 7805

1 3

2

IN O UT

G ND

+

C 3

22uF /20V

DC B_ Pos

C 12

100nF

R 2

220k

J8

FA S TO N

G C1

G ND_C onnec tio n

D3 S M/1N400 1

U1B

MC 74HC 14A

3 4

14

DC B_ Half

1

G C2

G ND_C onnec tio n

G ND

R 1

680

+5V _D

C 10

100nF

+3.3 V_A

C 6

100nF

D2

LE D Gre en

G ND

J5

FA S TO N

G NDA

J1

C ON/40

123456789101112131415161718192021222324252627282930313233343536373839

40

J7

FA S TO N

R 3

100k

TP 2

1

JP 4

C ON/2s crews /big

1
2

U2

MC 78P C3 3NT R

1 523

Vin Vout

Gnd

C E

U1A

MC 74HC 14A

1 2

147

+

C 4

10uF /6.3V

L2

1mH

C 8

100nF

C 5

100nF

J3

P ower J ack

1

2

3

+V

-V

-V

JP 2

S M/JUM PE R 1x3

123

S W1

R otary S witch

3

2

1

4

C

B

A

X

+

C 1

22uF /20V

J4

C ON/3s crews

1

2

3

D4 S M/1N400 1

C 11

100nF

+

C 9

22uF /20V

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Schematics and Parts List 27

Schematics and Parts List

Schematics

Figure 4-1a SMOS EVM Motor Board ver. 140A02 Overview

5 4 3 2 1

UN I-24

DC B_Neg

UN I-21

UN I-35

UNI-9

UN I-29

UN I-36

UN I-11

UNI-1

UN I-22

UN I-23

UNI-7

UN I-19

UN I-25

UN I-30

UN I-34

UNI-3

UNI-5

UN I-38

UN I-31

DC B_P os

DC B_ Pos _IN

UN I-39

UN I-40

PW M_ H

PW M_ H

PW M_c trl

G ND G NDG ND G ND

+5V _D

+5V _D

+3.3 V_A

+5V _D

+5V _D

G ND

G ND

+5V _D

G ND

+3.3 V_A

G ND

+3.3 V_A

G NDA

G NDA

G ND

G ND

G NDA

G NDA

G NDA

G ND G NDA

+5V _D

G ND

+3.3 V_A

G NDA

G ND

G NDA G NDA

G ND

+5V _D

+3.3 V_A

G NDA GND AG NDA

G ND G ND

G NDAG NDA

DC B_NegDC B_Neg DC B_ Neg

PWM_CB

Shielding_A

PWM_BB

PWM_BT

PWM_AB

Brake_control

Zero_cross_C

BEMF_sense_A

Identification

I_sense_A

V_sense_DCB

Shielding_A

Driver Mode C ontrol J umpers

I_reconst_DCB

PWM_CT

Shielding_D

PWM_ctrl

PWM_AT

BEMF_sense_C

I_sense_B

Shielding_D

I_sense_C

+12V_A

Shielding_D

Shielding_D

Shielding_D

Zero_cross_B

Zero_cross_A

BEMF_sense_B

MODE0

MODE1

Ph B

Uni-24

Ph A

Uni-23

Ph C

Uni-25

PWM

J2

AMP 64 0387- 3

1

2

3

3- ph. H -bridge drive r

HS E _AT

LS E _AB

P hase _A

P hase _B

P hase _C

HS E _B T

LS E _B B

HS E _C T

LS E _C B

DC B_ Pos _IN

DC B_ Neg

V_ sens e_D CB _ha lf

V_ sens e_D CB

I_s ens e_A2

I_s ens e_A1

I_s ens e_B 1

I_s ens e_B 2

I_s ens e_C 1

I_s ens e_C 2

PW M_ IN
MOD E0
MOD E1

I_z ero_re f

I_re const_D CBG ND

+5V _D

DC B_ Pos

Bra ke_ control

+3.3 V_A

G NDA

C 7

100nF

JP 3

S M/J UM PE R 1x3

123

D1

1.5 SM C18 AT3

L1

1mH

DC B_P os

U16

MC 7805

IN

1

OU T

3

G ND

2

+

C 3

22 uF/20V

C 12

100nF

R 2

220k

J8 F AS TO N

G C1

G ND _C onnec tion

D3 S M/1N400 1

U1B

MC 74HC 14A

3 4

14

DC B _Half

1

G C2

G ND _C onnec tion

G ND

R 1

680

+5V _D

C 10

100nF

+3.3 V_A

D2

LE D Gre en

C 6

100nF

J5

FA S TO N

G ND

R 5

3.3 k

J1

C ON/40

123456789101112131415161718192021222324252627282930313233343536373839

40

G NDA

J7

FA S TO N

R 3

100k

TP 2

1

JP 4

C ON /2s cre ws/big

1
2

Ba ck EMF

Pha se _B

G NDA

+5V _D

BE MF _s ens e_C

Zero_ cros _C

Zero_ cros _B

Pha se _A

BE MF _s ens e_A

V_ sens e_D CB _ha lf

Pha se _C

Zero_ cros _A

BE MF _s ens e_B

G ND

Identification

S W1

pus hbutton

R E SE T

1 3

2 4

U2

MC 7 8PC 33N TR

Vin

1

Vout

5

Gnd

2

C E

3

U1A

MC 74HC 14A

1 2

147

L2

1mH

+

C 4

10uF /6.3V

C 8

100nF

C 5

100nF

J3

P ower Ja ck

+V

1

-V

2

-V

3

C urre nt proces sing

I_re const_D CBG NDA

+3.3 V_A

I_s ens e_A2

I_s ens e_A1

I_s ens e_B 1

I_s ens e_B 2

I_s ens e_C 1

I_s ens e_C 2

I_s ens e_A

I_s ens e_B

I_s ens e_C

I_z ero_re f

JP 2

S M/J UM PE R 1x3

123

JP 5

S M/J UM PE R 1x3

123

R 4

1.5 k

J4

C ON /3s crews

1

2

3

+

C 1

22 uF/20V

D4 S M/1N400 1

C 11

100nF

+

C 9

22 uF/20V

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

28 Schematics and Parts List

Schematics and Parts List

Figure 4-2 3-Phase H-Bridge with Gate Driver

3.30V @ 16V

3.0V @ 16V

+5V_D needed

Bra ke Control

DC B_ Bra ke

DC B_ Neg

DC B_ Pos

Pha se _A Pha se _CPha se _B

Pha se _A

Pha se _C

Pha se _B

Ga te_C BGa te_AB

Ga te_AT Ga te_C TGa te_BT

Ga te_B B

DC B_ IGN

DC B_ Pos

VG DH

DC B_ Neg

DC B_ Pos

DC B_ Neg

Ga te_B T

Ga te_C T

Ga te_C B

Ga te_AB

DC B_ Neg

Ga te_AT

DC B_ Pos

DC B_ IGN

Ga te_B B

VG DH

GN D

+5V_ D

+5V_ D

+3.3 V_A

GN D

GN D

+5V_ D

+3.3 V_A

GN DA

GN DA

GN D

R 106

120- 1%

R 108

1.8 k-1%

R 120

51

R 117

10k

D101

MB R M140T 3

R 132

100k

R 128

51

R 119

51

U10 4C

DM74 ALS 1034 M

56

C1 05

10nF

D103

MB R M140T 3

R 127

51

R 113

10k

R 131

10k/T RI MR /SP E CT R OL /64Y

1 3

2

R 122

51

sense

sense

R 102

PM A-A-R 030 -1

D102

MB R M140T 3

+

C1 02

33 0uF/35V

R 118

10k

R 124

51

C1 08

100nF

C1 09

100nF

R 133

100k

R 121

51

+

C1 03

33 0uF/35V

R 123

51

C1 04

150nF

R 114

10k

+

C1 01

33 0uF/35V

D104

MB R M140T 3

U10 4E

DM74 ALS 1034 M

1110

U10 4F

DM74 ALS 1034 M

1312

C1 06

10nF

R 125

51

R 126

51

R 130

51

U10 4B

DM74 ALS 1034 M

34

R 110

10k

U10 4D

DM74 ALS 1034 M

98

D106

MB R M140T 3

Q10 1

MTD 3302 T4

R 129

51

R 115

10k

Q10 2

MTD 3302 T4

Q10 4

MTD 3302 T4

Q10 3

MTD 3302 T4

U10 3

PC 33 395

123

4

242223

21

567

201918

17

8

151216

149131011

3031292625

283227

C2 H

CR E S

VI GN

VG DH

HS E 3

MOD E1

MOD E0

PW M

VI GNP

S 1

GD H1

VD D

GN D

IS +

IS -

GD L1

PG ND

S 3

TL IM

GD L3

S 2

GD H3

GD H2

GD L2

C1 L

C1 H

LS E 1

HS E 1

HS E 2

LS E 2

C2 L

LS E 3

Q10 5

MTD 3302 T4

sense

sense

R 103

PM A-A-R 030 -1

Q10 6

MTD 3302 T4

R 111

10k

sense

sense

R 101

PM A-A-R 030 -1

R 107

180- 1%

U10 4A

DM74 ALS 1034 M

12

147

R 116

10k

R 109

1.2 k-1%

R 105

2.7 k-1%

R 104

10k-1 %

C1 07

1 uF

R 112

10k

Q10 7

MTD 3302 T4

D105

MB R M140T 3

Pha se _B

DC B_ Pos _IN

Pha se _CPha se _A

I_s ens e_B 2

I_s ens e_B 1 I_sens e_C 1

I_s ens e_C 2

I_s ens e_A1

I_s ens e_A2

+5V_ D

DC B_ Neg

Bra ke_c ontrol

GN D

V_ sens e_D CB

DC B_ Pos

V_ sens e_D CB _ha lf

MOD E0

HS E _ATLS E _AB

PW M_I N

I_re const_D CB

LS E _B B

MOD E1

I_z ero_ref

+3.3 V_A

HS E _B T

HS E _C TLS E _C B

GN DA

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Schematics and Parts List 29

Schematics and Parts List

Schematics

Figure 4-3 Current Feedback Circuits

1.65V +/- 1.65V @ +/- Imax

delta = +/-288 mV @ +/- Imax

1.65V ref

delta = +/-288 mV @ +/- Imax

1.65V +/- 1. 65V @ +/- Imax

delta = +/-288 mV @ +/- Imax

1.65V +/- 1. 65V @ +/- Imax

1.65V ref

+3.3V _A

+3.3V _A

+3.3V _A

GN DA

GN DA

GN DA

GN DA

GN DA

GN DA

GN DA

+3.3V _A

U30 3

LM2 85M

8

5

4

R 306

100k -1%

R 310 6k8 -1%

R 315

39k-1 %

R 312

39k-1 %

1.6 5Vre f

1

+

-

U30 2B

MC 33502 D

5

6

7

R 307

33k-1 %

R 311

39k-1 %

R 305

390

R 316

33k-1 %

R 308

39k-1 %

R 302 6k8 -1%

R 303 6k8 -1%

R 319 33 k-1%

C3 01

100nF

+

-

U30 1B

MC 33502 D

5

6

7

C3 02

100nF

+

-

U30 2A

MC 33502 D

3

2

1

8 4

R 301

39k-1 %

C3 03

100nF

R 313 6k8 -1%

R 304

39k-1 %

R 318 33 k-1%

R 317 33 k-1%

R 309 6k8 -1%

+

-

U30 1A

MC 33502 D

3

2

1

8 4

R 314 6k8 -1%

I_s ense _C 2

GN DA

I_s ense _C 1

+3.3V _A

I_s ense _A2

I_s ense _A1

I_s ense _A

I_s ense _B 2

I_re const_D CB

I_z ero_ref

I_s ense _C

I_s ense _B 1

I_s ense _B

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

30 Schematics and Parts List

Schematics and Parts List

Figure 4-4 Back-EMF Signals

max. 16V

u+ <6V

u+ =2*V_sense_DCB_half@3.3V

3.30V @ Phase_C = 16V

max. 16V

3.30V @ Phase_B = 16V

u+ <6V

u+ =2*V_sense_DCB_half@3.3V

u+ <6V

u+ =2*V_sense_DCB_half@3.3V

3.30V @ Phase_A = 16V

max. 16V

Frequency:

1500Hz +/-20%

+5V_ D

GN DA

GN DA

GN DA

+5V_ D

GN DA

GN D

GN DA

GN DA

GN DA

GN D

GN DA

+5V_ D

GN D

+5V_ D

+5V_ D

GN D

GN D

+5V_ D

R 206

5.6 k

R 224

33k

R 225

33k

R 213

5.6 k

R 226

33k

R 220

5.6 k

R 209

1M

C2 03

100nF

+

-

U20 1D

LM3 39D

11

10

13

R 215

1M

C2 01

100pF

R 201

10k-1 %

R 207

3.3 k-1%

R 203

2.7 k-1%

C2 02

100pF

C2 04

100pF

C2 05

22pF

R 208

10k-1 %

R 214

3.3 k-1%

R 210

2.7 k-1%

R 216

10k-1 %

R 221

3.3 k-1%

R 217

2.7 k-1%

+

-

U20 1A

LM3 39D

5

4

2

312

C2 06

47nF

R 204

10k

+

-

U20 1B

LM3 39D

7

6

1

R 211

10k

R 212

10k

R 218

10k

+

-

U20 1C

LM3 39D

9

8

14

R 202

1M

R 219

10k

R 205

10k

R 222

10k

R 223

10k

Pha se _B

GN DA

+5V_ D

BE MF _s ense _C

Zero_ cros_ C

Zero_ cros_ B

Pha se _A

BE MF _s ense _A

V_ sens e_D CB _half

Pha se _C

Zero_ cros_ A

BE MF _s ense _B

GN D

Identification

Schematics and Parts List

Schematics

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Schematics and Parts List 31

Figure 4-5 Brake Control

Figure 4-6 Brushless DC Motor Connections - Schematic View

C402

100nF

OutB

InB

GND

InA

NC NC

OutA

VCC

U401

MC33152D

2

3

5

6

7

81

4

R402

100

R403

1R

Brake

1

R401

10k

D401

MBRS33 0

C401

1nF

R404

100

Q40 1

MTD3302T4

DCB_Pos

DCB_Neg

DCB_Brake

MOTOROLA

EMBEDDED MOTION CONTROL

SERIES

Phase_C

Phase_B

Phase_A

BRUSHLESS

+ 12 Vdc

56800(E) EVALUATION MODULE

OR

40-PIN

RIBBON CABLE

1

2 3 4 5

MOTOR

HC08 CONTROL BOARD

MOTOROLA

EMBEDDED MOTION CONTROL

SERIES

SMOS EVM MOTOR BOARD

3

2

1

HALL/ENCODER

CONNECTOR

WHITE/RED

WHITE/YELLOW

WHITE/BLACK

+

–

J1

HALL C (BLUE)

HALL B (WHITE)

HALL A (GREEN)

GND (BLACK)

+5V (RED)

OR

HCS12 CONTROL BOARD

OR

MPC EVALUATION MODULE

J3/JP4

J2/J4

J5,J7,J8

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

32 Schematics and Parts List

Schematics and Parts List

4.4 Parts List

The SMOS EVM motor board’s list of parts is described in the following
table.

Table 4-1 Parts List (Sheet 1 of 4)

Qty. Reference Part Value Description Mfg. Mfg. Part No.

3 C1, C3, C9 22 "F/25 V

Tantalum capacitor, D,
22 "F/20 V, #10%,
ESR 0.2

AVX

1 C4 10 "F/ 6.3 V

Tantalum Capacitor, A,
10 "F/6.3 V, #10%

AVX, E L NA

14

C5, C6, C7, C8, C10,
C11, C12, C108,
C109, C203, C301,
C302, C303, C402

100 nF

Capacitor, 0805,
Ceramic 100 nF/25 V,
Z5U, #20%

Vishay Vitramon

3 C101, C102, C103 330 "F/35 V

Electrolytic Capacitor
330 "F/35 V, Type RE2

ELNA

1 C104 150 nF

Ceramic capacitor,
0805, 150 nF, #5%

Vishay Vitramon

2 C105, C106 10 nF

Ceramic capacitor,
0805, 10 nF, #5%

Vishay Vitramon

1C107 1 uF

Polyester Capacitor
1uF/63V, #10%, Type
MKT 220-7

EPCOS

3 C201, C202, C204 100 pF

Ceramic capacitor,
0805, 100 pF, #5%

Vishay Vitramon

1 C205 22 pF

Ceramic capacitor,
0805, 22 pF, #5%

Vishay Vitramon

1 C206 47 nF

Ceramic capacitor,
0805, 47 nF, #5%

Vishay Vitramon

1C401 1 nF

Ceramic capacitor,
0805, 1 nF, #5%

Vishay Vitramon

1D1 1.5SMC18AT3

Zener Transient Vol­tage Suppressor 18V

ON
Semiconductor

1.5SMC18AT3

1D2 LED Green

LED diode, SMD,
20 mA, green

Kingbright AA3528SGT

2 D3, D4 1N4001

General Purpose Axial
Rectifier 50V, 1A

ON
Semiconductor

1N4001

6

D101, D102, D103,
D104, D105, D106

MBRM140T3

Shottky Rectifiers 40 V, 1AON

Semiconductor

MBRM140T3

1 D401 MBRS330

Schottky Rectifier 30V, 3AON

Semiconductor

MBRS330

3 JP2, JP3, JP5 JUMPER1x3

Jumper, 3-pin header,

0.1”, M20-973 type

HARWIN

Schematics and Parts List

Parts List

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Schematics and Parts List 33

1 JP4 CON/2screws

2 screws PCB terminal,
5mm pin spacing

WAGO 237-132

1 J1 CON/40

Header 40 pins
breakaway connector

Fischer
Elektronik

ASLG40G

1 J2 AMP 640387-3 Header 3 pins AMP 640387-3

1 J3 Power Jack

Power Jack type
connector 2.1 mm

CUI Stack PJ-002

1 J4 CON/3screws

3 screws PCB terminal,
5mm pin spacing

WAGO 237-133

3 J5, J7, J8 FASTON

Faston connector
V90P vertical, 6.3mm
wide

AMP

2 L1, L2 1 mH Inductor 1 mH, 0.2 A Epcos

8

Q101, Q102, Q103,
Q104, Q105, Q106,
Q107, Q401

MTD3302T4

Power N MOSFET
Transistor, 30 V, 18 A

ON
Semiconductor

MTD3302T4

1 R1 680R

Resistor 680 ! , 5%,
0805

Vishay Dale

1 R2 220k

Resistor 220 k! , 5%,
0805

Vishay Dale

3 R3, R132, R133 100k

Resistor 100 k! , 5%,
0805

Vishay Dale

1R4 1.5k

Resistor 1.5k!$%5%,
0805

Vishay Dale

1R5 3.3k

Resistor 3.3k!$%5%,
0805

Vishay Dale

3 R101, R102, R103 PMA-A-R030-1

Sensing resistor with
Kelvin terminals,
30 m! , 1%

Isabellenhuette PMA-A-R030-1

4

R104, R201, R208,
R216

10k-1%

Resistor 10 k! , 1%,
0805

Vishay Dale

4

R105, R203, R210,
R217

2.7k-1%

Resistor 2.7 k! , 1%,
0805

Vishay Dale

1 R106 120-1%

Resistor 120 ! , 1%,
0805

Vishay Dale

1 R107 180-1%

Resistor 180 ! , 1%,
0805

Vishay Dale

1 R108 1k8-1%

Resistor 1.8 k! , 1%,
0805

Vishay Dale

1 R109 1k2-1%

Resistor 1.2 k! , 1%,
0805

Vishay Dale

Table 4-1 Parts List (Sheet 2 of 4)

Qty. Reference Part Value Description Mfg. Mfg. Part No.

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

34 Schematics and Parts List

Schematics and Parts List

18

R110, R111, R112,
R113, R114, R115,
R116, R117, R118,
R204, R205, R211,
R212, R218, R219,
R222, R223, R401

10k

Resistor 10 k! , 5%,
0805

Vishay Dale

12

R119, R120, R121,
R122, R123, R124,
R125, R126, R127,
R128, R129, R130

51R

Resistor 51 ! , 5%,
0805

Vishay Dale

1 R131 10k/TRIMMER

Cermet-Trimmer 10
k! , 0.15W, 4315-SMD

Hinkel-elektronik

3 R202, R209, R215 1M

Resistor 1 M! , 5%,
0805

Vishay Dale

3 R206, R213, R220 5.6k

Resistor 5.6 k! , 5%,
0805

Vishay Dale

3 R207, R214, R221 3k3-1%

Resistor 3.3 k! , 1%,
0805

Vishay Dale

3 R224, R225, R226 33k

Resistor 33 k! , 5%,
0805

Vishay Dale

6

R301, R304, R308,
R311, R312, R315

39k-1%

Resistor 39 k! , 1%,
0805

Vishay Dale

2

R302, R303, R309,
R310, R313, R314

6k8-1%

Resistor 6.8 k! , 1%,
0805

Vishay Dale

1 R305 390R

Resistor 390 ! , 5%,
0805

Vishay Dale

1 R306 100k-1%

Resistor 100 k! , 1%,
0805

Vishay Dale

5

R307, R316, R317,
R318, R319

33k-1%

Resistor 33 k! , 1%,
0805

Vishay Dale

2 R402, R404 100R

Resistor 100 ! , 5%,
0805

Vishay Dale

1R403 1R

Resistor 1 ! , 1%, SQM
type, 5-7W

Meggit CGS

1

SW1 (only in 140A01
board version)

Rotary Switch

Rotary Switch, RTE03
type, 3 positions

ITT Cannon

1

SW1 (only in 140A02
board version)

pushbutton

Tactile SMD switch,
B3S-1000 type,
6x6mm

OMRON RS#183-701

1 U1 MC74HC14A Hex Schmitt Inverter

ON
Semiconductor

MC74HC14A

1 U2 MC78PC33NTR

Linear Voltage
Regulator

ON
Semiconductor

MC78PC33NTR

Table 4-1 Parts List (Sheet 3 of 4)

Qty. Reference Part Value Description Mfg. Mfg. Part No.

Schematics and Parts List

Parts List

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Schematics and Parts List 35

1 U16 MC7805

Positive Voltage
Regulator, 5V, 1A

ON
Semiconductor

MC7805ACT

1 U103 MC33395 3-phase Gate Driver Freescale MC33395T

1 U104 DM74ALS1034M

Hex Non-Inverting
Driver

Fairchild DM74ALS1034M

1 U201 LM339D Quad Comparator

ON
Semiconductor

LM339D

2 U301, U302 MC33502D

Operational Amplifier,
rail-to-rail

ON
Semiconductor

MC33502D

1 U303 LM285M

Adjustable Voltage
Reference

ON
Semiconductor

LM285M

1 U401 MC33152D

High-Speed Dual
MOSFET Driver

ON
Semiconductor

MC33152D

Table 4-1 Parts List (Sheet 4 of 4)

Qty. Reference Part Value Description Mfg. Mfg. Part No.

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

36 Schematics and Parts List

Schematics and Parts List

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Design Considerations 37

33395 Evaluation Motor Board

Section 5. Design Considerations

5.1 Contents

5.2 Overview................................................................................... 37

5.3 3-Phase H-Bridge .....................................................................37

5.4 Bus Voltage and Current Feedback Signals.............................38

5.5 Back-EMF Signals ....................................................................40

5.6 Brake Control ........................................................................... 41

5.2 Overview

From a systems point of view, the SMOS EVM motor board kit fits into
an architecture that is designed for application development. In addition
to the hardware that is needed to run a motor, a variety of feedback
signals that facilitate control algorithm development are provided.

The SMOS EVM motor board’s power output stage is a complementary
MOS field effect transistor (MOSFET) 3-phase bridge that is capable of
supplying and sensing 8 amps of continuous current. Feedback signals
include bus voltage, phase currents, reconstructed bus current,
Back-EMF (electromotive force), and zero crossing. The following
sections describe these features.

5.3 3-Phase H-Bridge

Use of the Freescaleintegrated 3-phase gate driver, MC33395,
considerably simplifies control of the output stage which is configured as
a 3-phase H-bridge with six complementary N-MOSFET output
transistors. Together with external components this device provides

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

38 Design Considerations

Design Considerations

reverse battery protection, a high-side, MOSFET switch, PWM
frequencies up to 28 kHz and built-in protective circuitry to prevent
damage to the MOSFET bridge and the drive’s IC, and includes: thermal
(not used), over-current, over-voltage (>27V) and under-voltage (<4V)
shutdown. A schematic is shown in Figure 4-2.

At the input, pulldown resistors R110 thru R118 set logic low in the
absence of a signal. Open input pulldown is important, since it is
desirable to keep the power transistors off in case of either a broken
connection or absence of power on the control board. In order to accept
5-volt MCUs and 3.3-volt DSPs, a Fairchild non-inverting driver
DM74ALS1034M unifies the level of the LSEx and HSEx input signals.
This component has a minimum high-state logic 1 input voltage of

2.0 volts, and a maximum low-state logic 0 input voltage of 0.8 volts. The
SMOS EVM motor board will thus enable the connection of large number
of controller boards with various MCUs or DSPs, for example
MC68HC908, HCS12, MPC555, DSP56F8XX(E), etc. Under-voltage
lockout is not included in the gate drive. If this feature is desired, the
control board’s under-voltage detection comparator can be set for 0.85
volts.

5.4 Bus Voltage and Current Feedback Signals

Feedback signals proportional to bus voltage, phase currents and
reconstructed bus current are provided in this section.

Bus voltage is scaled down by a voltage divider consisting of R104,
R105, R106, R107, R108, and R19. The values are chosen such that a
16-volt maximum bus voltage corresponds to a 3.3-volt maximum
analog-to-digital (A/D) input. Figure 5-1 depicts the dc bus voltage
circuitry. Phase currents are sampled by resistors R101, R102 and R103
in Figure 4-2 and amplified by the circuit in Figure 5-1, which shows the
circuitry for phase A. This circuit provides a voltage output suitable for
sampling with A/D inputs. An MC33502 is used as a differential amplifier.
The gain is given by:

A = R301/R302

Design Considerations

Bus Voltage and Current Feedback Signals

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Design Considerations 39

The output voltage is shifted up by 1.65 V into the middle of the converter
range, to accommodate both positive and negative current swings. A
#300-mV voltage drop across the shunt resistor corresponds to a
measured current range of #10 amps (peak value), again with 3.3V
maximum on the output.

The SMOS EVM motor board measures and limits current according to
a reconstructed bus current value that inverts swings of phase current
signals and also shifts the output up by 1.65V with gain A=1. Its
significance is adjustable with a trimmer, R131, used for setting an
over-current comparator implemented in the SMOS driver. This
comparator disables the driver outputs when the IS- (the driver pin)
voltage rises above IS+, see Figure 5-2. This happens when the
following is true:

IS-

&%IS+ ' V

IS+off

( 0.08 * Imax

DCB

+ 1.65 [V; A]

CAUTION: The value, V

IS+

> 2.45V, disables the over-current circuit protection

functionality since the value on the V

IS-

pin is always smaller than

2.45 volts. Allowing a larger V

IS+

value can lead to permanent damage

of the board if a current higher than 18 amps is applied!

For resetting board faults see step 6 in chapter 1.5.

Figure 5-1 Phase Current and DC Bus Voltage Sensing

+

–

R302 6k8 -1%

R303 6k8 -1%

R304
39 k-1%

R306
100 k-1%

R307
33 k-1%

GNDA

LM285M

U303

R305

390 !

+3.3V_A

I_sense_A1

I_sense_A2

5

4

8

1.65 Vref

I_sense_A

R301

39 k-1%

2

3

1

U301A

MC33502D

DCB_Pos

DCB_Neg

R104

10 k-1%

2.7 k-1%

R105

V_sense_DCB

R108

1.2 k-1%1.8 k-1%

R109

180 ! -1%

R107

120 ! -1%

R106

V_sense_DCB_half

DRM33395 Designer Reference Manual 33395 Evaluation Motor Board

40 Design Considerations

Design Considerations

Figure 5-2 Reconstructed Bus Current

5.5 Back-EMF Signals

Back-EMF and zero crossing signals are included to support sensorless
algorithms for brushless dc motors. Referring to Figure 5-3, which
shows the circuitry for phase C, the raw phase voltage is scaled down by
a voltage divider consisting of R216, R217, and R221. One output from
this divider, BEMF_sense_C produces Back-EMF sense voltage.
Resistor values are chosen such that a 16-volt maximum phase voltage
corresponds to a 3.3-volt maximum A/D input.

A zero crossing signal is obtained by comparing the motor phase voltage
with ½ the value of the motor bus voltage. Comparator U201A performs
this function, producing a zero crossing signal, Zero_cross_C.

Figure 5-3 Phase C Back-EMF Feedback

+

–

R305

390 !

+3.3V_A

+1.65V

I_reconst_DCB

R316

33 k-1%

2

3

1

U302A

MC33502D

R317 33 k-1%

I_sense_A

R318 33 k-1%

R319 33 k-1%

I_sense_B

I_sense_C

R132
100 k

R133
100 k

GNDA

R131

10 k

1

3

2

C108

100 nF

IS- (pin 17 of U103)

IS+ (pin 18 of U103)

GNDA

=

–

+

GNDA

GNDA GNDA

10 k-1%

R216

R217

2.7 k-1%

R221

3.3 k-1%

10 k

R218

C204

100 pF

R220

5.6 k

C205

22 pF

V_sense_DCB_half

R215

1 M

10 k

R219

+5V_D

U201A
LM339D

4

5

12

2

Zero_cross_C

BEMF_sense_C

Phase_C

Design Considerations

Brake Control

33395 Evaluation Motor Board DRM33395 Designer Reference Manual

Design Considerations 41

5.6 Brake Control

A brake circuit is included to dissipate re-generative motor energy during
periods of active deceleration or rapid reversal. Under there conditions,
motor Back-EMF adds to the dc bus voltage. Without a means to
dissipate excess energy, an over-voltage condition could easily occur.

The circuit shown in Figure 4-5 connects R403 across the dc bus to
dissipate energy. The transistor Q401 is turned on by software when the
bus voltage sensing circuit in Figure 5-1 indicates that the bus voltage
could exceed safe levels. On-board power resistor R403 will safely
dissipate up to 5 watts continuously or up to 50 watts for 5 seconds.

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DRM33395/D
Rev. 2
05/2003

Information in this document is provided solely to enable system and software implementers to use Freescaleproducts.
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