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DA14683 USB Kit
User Manual
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Dialog Semiconductor DA14683 USB Kit User Manual

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Page 1
Company Confidential
User Manual
DA14683 USB Kit
UM-Β-094
Abstract
This document outlines the system design, configuration options and supported features of DA14683 USB Kit, rev-C (224-46-C).
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UM-Β-094
DA14683 USB Kit
Company Confidential
User Manual
28-May-2018
CFR0012
© 2018 Dialog Semiconductor
Contents
Abstract ................................................................................................................................................ 1
Contents ............................................................................................................................................... 2
Figures .................................................................................................................................................. 3
Tables ................................................................................................................................................... 3
1 Terms and Definitions ................................................................................................................... 4
2 References ..................................................................................................................................... 4
3 Introduction.................................................................................................................................... 5
4 System Overview ........................................................................................................................... 5
4.1 Features ................................................................................................................................ 5
4.2 System and Components Description (Top View) ................................................................ 6
4.3 System and Components Description (Bottom View) ........................................................... 7
4.4 Block Diagram ....................................................................................................................... 9
5 USB Kit System ........................................................................................................................... 10
5.1 Overview ............................................................................................................................. 10
5.2 DA14683 System ................................................................................................................ 10
5.3 DA14683 Pin Assignment ................................................................................................... 12
5.4 Booting from UART ............................................................................................................. 13
5.5 Crystals ............................................................................................................................... 14
5.6 Antenna and RF Port .......................................................................................................... 15
5.6.1 RF Measurements and Antenna Matching .......................................................... 16
5.7 QSPI Data Flash memory (U9) ........................................................................................... 17
5.8 Reset Circuit ........................................................................................................................ 18
5.9 Push Buttons ....................................................................................................................... 19
5.10 User Controlled LEDs ......................................................................................................... 20
5.11 MikroBUS™ Module ............................................................................................................ 21
5.12 GND Support Points ............................................................................................................ 23
5.13 Over Voltage Protection Circuit (OVP) ................................................................................ 23
5.14 USB HUB ............................................................................................................................ 24
5.15 Debugging Processor (U4) ................................................................................................. 24
5.16 Power Section ..................................................................................................................... 25
6 Software Configuration ............................................................................................................... 27
6.1 Using the DA14683 USB kit as a USB Device ................................................................... 27
6.2 Using DA14683 USB kit as Development kit ...................................................................... 28
7 PCB Layout .................................................................................................................................. 29
Appendix A ......................................................................................................................................... 30
A.1 Schematics .......................................................................................................................... 30
A.2 Bill of Materials (BOM) ........................................................................................................ 34
Revision History ................................................................................................................................ 35
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Figures
Figure 1: DA14683 USB Kit ................................................................................................................... 5
Figure 2: USB Kit - Top side .................................................................................................................. 6
Figure 3: USB Kit - Bottom side ............................................................................................................ 7
Figure 4: Block diagram of DA14683 USB kit ....................................................................................... 9
Figure 5: DA14683 schematic ............................................................................................................. 11
Figure 6: Chip Antenna PCB Footprint and Mechanical specifications ............................................... 15
Figure 7: RF matching circuit, SMD Chip antenna and SMA connector ............................................. 15
Figure 8: RF port, RF connector, RF matching and SMD Chip antenna ............................................ 16
Figure 9: Radiated measurements results - Standing position ........................................................... 16
Figure 10: Radiated measurements results - Laying position ............................................................. 17
Figure 11: QSPI Flash with selectable power supply (V33 or V18) .................................................... 17
Figure 12: Reset circuit ........................................................................................................................ 18
Figure 13: Reset push button .............................................................................................................. 18
Figure 14: General purpose push buttons ........................................................................................... 19
Figure 15: General purpose push buttons SW1, SW2 (populated at TOP) ........................................ 19
Figure 16: General purpose push buttons SW3, SW4 (no populated at BOTTOM) ........................... 19
Figure 17: General purpose LEDs ....................................................................................................... 20
Figure 18: General Purpose LEDs D9 (red) & D10 (white) ................................................................. 20
Figure 19: MikroBus™ pin assignment and extra DA14683 I/O & Power output................................ 21
Figure 20: J6 and J7 female sockets (must be placed and soldered by users) .................................. 21
Figure 21: Proper orientation and connection between DA14683 USB Kit and a MikroBus™ click
board .................................................................................................................................................... 22
Figure 22: MikroBus™ pin assignment ............................................................................................... 22
Figure 23: GND support point ............................................................................................................. 23
Figure 24: GND support point (Male header must be placed from the user) ...................................... 23
Figure 25: Over voltage protection circuit ............................................................................................ 23
Figure 26: USB HUB circuitry .............................................................................................................. 24
Figure 27: Debugging processor - UART and JTAG interface ............................................................ 25
Figure 28: DA14683 USB Kit power tree ............................................................................................. 25
Figure 29: Linear voltage regulators (LDOs) U3 and U4 ..................................................................... 26
Figure 30: DA14683 power selection through SW6 ............................................................................ 26
Figure 31: Power selection switch SW6 (default position to 5V) ......................................................... 27
Figure 32: PCB cross section .............................................................................................................. 29
Figure 33: USB Hub section ................................................................................................................ 30
Figure 34: UART & JTAG interface chip section ................................................................................. 31
Figure 35: DA14683 SoC section ........................................................................................................ 32
Figure 36: Mikrobus™ and peripherals section ................................................................................... 33
Figure 37: Bill of materials (BOM) ....................................................................................................... 34
Tables
Table 1: Various test point assignments ............................................................................................... 7
Table 2: USB kit pin assignment ......................................................................................................... 12
Table 3: Y4 (16 MHz crystal) characteristics ....................................................................................... 14
Table 4: Y3 (32 kHz crystal) characteristics ........................................................................................ 14
Table 5: Antenna characteristics ......................................................................................................... 15
Table 6: RF Components names and values ...................................................................................... 16
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1 Terms and Definitions
USB Universal Serial Bus JTAG Join Test Action Group UART Universal Asynchronous Receiver-Transmitter SDK Software Development Kit SW Software PC Personal Computer SOC System on Chip GPIO General Purpose Input Output LDO Low Dropout QSPI Quad Serial Peripheral Interface SMA Sub-Miniature version A OVP Over Voltage Protection SOIC Small Outline Integrated Circuit DMIPS Dhrystone Million Instructions per Second OTP One Time Programmable PLL Phase-Locked Loop SIMO Single-Inductor Multiple-Output DCR Direct Current Resistor RF Radio Frequency SPI Serial Peripheral Interface MISO Master In Slave Out MOSI Master Out Slave In I2C Inter-Integrated Circuit RFIO Radio Frequency Input Output SMD Surface-Mount Device
2 References
[1] DA14683 Datasheet, Datasheet, Dialog Semiconductor. [2] AN-B-052, DA1458x/68x Development kit J-Link Interface, Application Note, Dialog
Semiconductor
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3 Introduction
This document describes the DA14683 USB Kit. This kit offers a low cost development board with basic functionality. The development kit is implemented on a single PCB. The block diagram, the actual board, the various sections and settings as well as the connectivity are presented. The purpose of this cost-effective USB kit is to provide users with the capability for:
● Software development
● Programming DA14683 via JTAG or UART using Dialog's SDK
● Connecting MikroBUS™ module
Figure 1: DA14683 USB Kit
4 System Overview
4.1 Features
The features of DA 14683 USB kit include:
■ Highly integrated Dialog Semiconductor DA14683 Bluetooth® Smart SoC
■ Access on GPIOs provided from the chip, when no MikroBUS™ is plugged in
■ The ability to be connected directly to PC USB without extra cables
■ Reset push button
■ General purpose LEDs and buttons
■ RGB LEDs connecting each color to dedicated PWM pins (LED1, LED2, LED3)
■ Using USB (5V) or LDO (3V3) as power source
■ JTAG and UART interface over USB via Segger
■ QSPI flash on board
■ 2.4GHz chip antenna and slot for SMA connector
■ 16MHz main crystal and 32.768KHz low-power crystal
■ Low cost
■ Compact design
■ A dimension of 89 mm × 26.7 mm × 4.5 mm
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4.2 System and Components Description (Top View)
Figure 2: USB Kit - Top side
The USB kit is based on the DA14683 SoC in an aQFN60 package. The marked and numbered sections of the system are:
1. Type-A USB connector (J1)
2. LDO 3.3V (U2)
3. GND support point (J9)
4. USB HUB (U1)
5. LDO 3.3V (U3)
6. Green LED (D6)
7. UART & JTAG interface (U4)
8. DA14683 power selection (5V or 3V - SW6)
9. MikroBUS™ connection points (Left side - J6, 8 pins)
10. Extra DA14683 I/O & Power output (J6, 3pins)
11. QSPI Flash (U9)
12. General purpose push buttons (SW2, SW3)
13. SMA connector (optional - J10)
14. Chip Antenna (ANT1)
15. General purpose LEDs (D9, White & D10, Red)
16. DA14683 SoC (U5)
17. RGB LED (D8)
18. MikroBUS™ connection points (Right side - J7, 8pins)
19. Reset button (SW5)
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20. Amber LED (D5)
21. OVP Circuit
4.3 System and Components Description (Bottom View)
Figure 3: USB Kit - Bottom side
The bottom side of the USB kit provides information about the MikroBus™ pins assignment, the Segger ID, and the date code. Test points have been placed for monitoring various signal behaviors and voltage levels of the components. The marked and numbered sections of the system are:
22. ID of UART & JTAG interface (U4)
23. Date code
24. MikroBus™ pins assignment (Right side - J7, 8pins) 25 Test points (more details in Table 1)
26. No populated general purpose push buttons (SW3, SW4)
27. Extra DA14683 I/O & Power output (J6, 3pins)
28. MikroBUS™ pins assignment (Left side - J6, 8 pins)
Table 1: Various test point assignments
Test point
Assigned to
Comments
TP1
USBDP_2
USB Data plus (+)
TP2
USBDM_2
USB Data minus (-)
TP3
USB_HUB_LED
Amber LED Voltage level
TP4
VDD_3V3_HUB
LDO 3.3V (U2) output voltage level
TP5
VDD_CORE
UART & JTAG interface (U4) core voltage level
TP6
Segger LED
Green LED Voltage level
TP7
GND
Ground
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Test point
Assigned to
Comments
TP8
TDI
For programming U4 in production - Not used for development
TP9
TCK_SWCLK
For programming U4 in production - Not used for development
TP10
TMS_SWDIO
For programming U4 in production - Not used for development
TP11
ERASE
For programming U4 in production - Not used for development
TP12
NRST
For programming U4 in production - Not used for development
TP13
VDDIO
QSPI data flash supply voltage
TP14
VBUS_683
Voltage level for VBUS pin of DA14683
TP15
V12
Voltage level for V12 pin of DA14683
TP16
V14
Voltage level for V14 pin of DA14683
TP17
VBAT3V
Voltage level for VBAT3V pin of DA14683
TP18
GREEN
Voltage level for Green LED of RGB (D8)
TP19
RED
Voltage level for Red LED of RGB (D8)
TP20
BLUE
Voltage level for Blue LED of RGB (D8)
TP21
GP_RED
Voltage level for Red LED (D10)
TP22
GP_WHITE
Voltage level for White LED (D9)
TP23
FIDUCIAL
Not electrically connected
TP24
FIDUCIAL
Not electrically connected
TP25
5V
USB input voltage level
TP26
HUB_RST
USB HUB reset pin
TP27
VDD_3V3_SEG
LDO 3.3V (U3) output voltage level
TP28
LDO_683
Input voltage level for LDO 3.3V (U10)
TP29
V33
Voltage for V33 pin of DA14683
TP30
SWO/TDO
For programming U4 in production - Not used for development
TP31
GND
Ground
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4.4 Block Diagram
U6
QSPI
USB_DP/DM
USB_DP/DM_1
USB_DP/DM_2
JTAG
UART
VDD_3V3_SEG
LDO (U3)
VDD_3V3_SEG
VBAT+
VBUS
5V
5V
OVP
VDD_3V3_HUB
LDO (U2)
VDD_3V3_HUB
16MHz
32KHz
LEDs
General Purpose
Switches
RST
V33
U4
SEGGER
T-Reset
T-Reset
SMA
Connector
Chip
Antenna
Mikro
Bus
J1
Type-A USB
Connector
U5
DA14683
RESET
VBAT+
LDO (U10)
3V3
SW6
VDD_3V3_HUB
U1
USB HUB
VDD_3V3_SEG
U6
Inverter
R86 R87
Figure 4: Block diagram of DA14683 USB kit
The power of Dialog’s DA14683 SoC on the USB kit can be supplied from two different sources (Figure 4):
● Default configuration: 5 V provided from the VBUS pin
● Alternative configuration: 3.3 V provided from the VBAT pin through LDO (U10)
The position of the SW6 connects the power supply of DA14683 and enables developers to select either of the two available power supply configurations.
The DA14683 USB Kit does not support external batteries.
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5 USB Kit System
5.1 Overview
● Board name/number: ○ DA14683 USB Kit/224-46-C
● SoC: ○ DA14683 in an aQFN60 package
● Flash memory: ○ W25Q80EWSNIG (8Mbit) QSPI Flash Memory, 8-SOIC package ○ 1.8 V power supply (default) ○ 3.0 V power supply (optional, if user changes manually the existing QSPI Flash with other
type)
● Clock inputs: ○ 16 MHz crystal ○ 32 KHz crystal
● Ports: ○ USB port for debugging purposes (no charging)
● Interfaces: ○ UART-JLink CDC UART Port (listed under Ports in Device Manager) ○ JTAG-JLink Driver (listed under Universal Serial Bus Controllers in Device Manager)
● Connectivity-Expansion connectors: ○ MikroBUS™ module can be plugged to J6, J7 sockets (users have to solder the sockets
manually)
● Power source selection: ○ 5 V on VBUS pin (default) or 3.3 V on VBAT (optional)
5.2 DA14683 System
The DA14683 is a flexible SoC combining an application processor, memories, cryptography engine, power management unit, digital and analog peripherals, and a radio transceiver.
The DA14683 is based on an ARM® Cortex®-M0 CPU, which delivers up to 84 DMIPS, provides a flexible memory architecture, and enables code execution from embedded memory (RAM, ROM) or non-volatile memory (OTP or external Quad-SPI Flash memory). The advanced power management unit of the DA14683 enables it to provide power to external devices like sensors, MikroBUS modules, or QSPI flash.
An on-chip PLL enables on-the-fly switching of the system clock between 32 kHz and 96 MHz to meet high processing requirements.
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Figure 5: DA14683 schematic
The DA14683 SoC power management subsystem consists of:
● VBUS: Battery charger input as well as USB bus voltage. ○ A decoupling capacitor (C35) equal or less than 4.7 μF is placed close to VBUS pin.
● VBAT1: Battery connection. ○ A 1 μF decoupling capacitor (C43, 0402 package, 6.3 V) is required to be placed close to the
pin.
○ Voltage range for VBAT1 is 1.7 V to 4.75 V. ○ On this development kit, VBAT1 and VBAT2 are connected together. No battery connection
is supported.
● VBAT2: Input of the SIMO DC-DC converter. ○ It is shorted externally with VBAT1. A 1 μF decoupling capacitor (C42, 0402 package, 6.3 V)
is required next to the pin.
○ On this development kit, VBAT1 and VBAT2 are connected together. No battery connection
is supported.
● V33: Output voltage rail (3.3 V). ○ A ceramic decoupling capacitor of 4.7 μF (C36, 0402 package, 6.3 V) is placed close to the
pin.
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○ V33 cannot be turned off.
● SIMO DC-DC converter outputs: V18, V18P, V12, V14. ○ The inductor needed for DC-DC operation is placed externally. A low DCR inductor (L1) of
470 nH, (0805 package), is connected on LX/LY pins.
○ V18, V18P: Power rails (1.8 V) for supplying external devices, even when the system is in
sleep mode.
– Decoupling ceramic capacitors (C37, C38) of 4.7 μF (0603 package, 16 V), are placed as
close as possible to the V18, V18P pins.
– V18 is assigned to the external Flash memory. – V18p is assigned to peripherals devices. – The current delivery capability of the V18 and V18P power rails is 75 mA in active mode
and 2 mA in sleep mode.
○ V12: Power rail that supplies the digital core of the DA1468x and delivers up to 50 mA at 1.2
V in active mode.
– A 4.7 μF decoupling capacitor (C39, 0402 package, 6.3 V) is used.
○ V14: Power rail that delivers up to 20 mA at 1.4 V and should not be used for supplying
external devices.
– A 4.7 μF decoupling capacitor (C40 0402 package, 6.3 V) is placed close to the V14 pin.
● V14_RF: Supply voltage input. ○ It is shorted to V14 on the PCB layout. ○ V14_RF powers the RF circuits via a number of dedicated internal LDOs. A 4.7 μF
decoupling capacitor (C41) is placed as close to the V14_RF pin as possible.
● VDDIO: QSPI Flash interface supply voltage. ○ It is connected to the same power rail as the Flash memory. ○ A 1 μF decoupling capacitor (C34, 0402 package, 6.3 V) is placed close to pin.
5.3 DA14683 Pin Assignment
Most of the available signals are utilized or extracted on the breakout connectors.
Table 2 provides the pin assignment of the breakout connectors on the USB kit and the related pin
name on the aQFN60 package of the DA14683.
Table 2: USB kit pin assignment
AQFN60 pin
name
Development kit
signal
Header pin
Comments
P0_0
QSPI_CLK
-
Only for DA14683/DA15101 SoCs.
For DA14682/DA15100 SoCs these pins are
not connected.
P0_1
QSPI_D0
-
P0_2
QSPI_D1
-
P0_3
QSPI_D2
-
P0_4
QSPI_D3
-
P0_5
QSPI_CS
-
P0_6
SWDIO - JTAG Data input/output
P0_7
GPIO/MB_AN
J6.4
GPIO/MikroBUS™ Analog
P1_0
GPIO/MB_PWM
J7.1
GPIO/MikroBUS™ PWM
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AQFN60 pin
name
Development kit
signal
Header pin
Comments
P1_1
USBDM_2 - USB Data minus (-)
P1_2
GP_LED_RED
-
General purpose Red LED
P1_3
T_TX
-
Universal Asynchronous Transmitter
P1_4
GPIO/MB_INT
J7.2
GPIO/MikroBUS™ Interrupt
P1_5
T_RTS
-
P1_6
T_CTS
-
P1_7
GPIO/MB_URX
J7.3
GPIO/MikroBUS™ Universal Asynchronous
Receiver
P2_0
XTAL32P
-
XTAL 32.768KHz plus (+)
P2_1
XTAL32M
-
XTAL 32.768KHz plus (-)
P2_2
USBDP_2 - USB Data minus (+)
P2_3
T_RX
-
Universal Asynchronous Receiver
P2_4
SWCLK - JTAG Clock
P3_0
GPIO/MB_SPI_MISO
J6.8
GPIO/MikroBUS™ SPI MISO
P3_1
GP_SW_1
-
General purpose Switch
P3_2
GP_SW_2
-
General purpose Switch
P3_3
GPIO/MB_SPI_CLK
J6.7
GPIO/MikroBUS™ SPI Clock
P3_4
GPIO - General purpose GPIO
P3_5
GPIO/MB_I2C_SDA
J7.6
GPIO/MikroBUS™ I2C SDA
P3_6
-
-
Not used
P3_7
GPIO/MB_I2C_SCL
J7.5
GPIO/MikroBUS™ I2C_SCL
P4_0
GPIO/MB_UTX
J7.4
GPIO/MikroBUS™ Universal Asynchronous
Transmitter
P4_1
GP_LED_WHITE
-
General purpose White LED
P4_2
GP_SW_3
-
General purpose Switch
P4_3
GP_SW_4
-
General purpose Switch
P4_4
-
-
Not used
P4_5
GPIO/MB_SPI_CS
J6.6
GPIO/MikroBUS™ SPI CS
P4_6
GPIO/MB_SPI_MOSI
J6.9
GPIO/MikroBUS™ SPI MOSI
P4_7
GPIO/MB_RST
J6.5
GPIO/MikroBUS™ Reset
LED1
LED1
-
RGB LED
LED2
LED2
-
LED3
LED3
-
5.4 Booting from UART
There is only one boot loader option for booting from UART using pins P1_3 (T_TX) and P2_3 (T_RX). Please note that UART-booting does not support hardware handshake signals (RTS/CTS).
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The settings for UART booting are:
● Baud rate 57.6 kbps
● 8 bits
● No parity
● 1 stop bit
For more details on booting with UART, check application note AN-B-052 (Ref [2]).
5.5 Crystals
The DA14683 SoC has two Digitally Controlled Crystal Oscillators, one at 16 MHz (XTAL16M) and the other at 32.768 kHz (XTAL32K). XTAL32K has no trimming capabilities and is used as the clock of the Extended/Deep Sleep modes, while XTAL16M can be trimmed.
The crystals used on the basic development kit are specified in Table 3 and Table 4.
Table 3: Y4 (16 MHz crystal) characteristics
Reference designator
Value
Part Number
7M-16.000MEEQ-T
Frequency
16 MHz
Accuracy
±10 ppm
Load Capacitance (CL)
10 pF
Shunt Capacitance (C0)
3 pF
Equivalent Series Resistance (ESR)
100 Ω
Drive Level (PD)
50 μW
Table 4: Y3 (32 kHz crystal) characteristics
Reference designator
Value
Part Number
9HT11-32.768KDZB-T
Frequency
32.768 KHz
Accuracy
±20 ppm
Load Capacitance (CL)
9 pF
Shunt Capacitance (C0)
1.3 pF
Equivalent Series Resistance (ESR)
100 Ω
Drive Level (PD)
1 μW
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5.6 Antenna and RF Port
A ceramic type of chip antenna (2450AT18A100E from Johanson) is currently used as a default antenna in the DA14683 USB Kit.
Table 5: Antenna characteristics
Part Number
Frequency (MHz)
Peak Gain (dBi)
Average Gain (dBi)
Return Loss (dB)
2450AT18A100
2400 to 2500
0.5 (XZ-V)
0.5 (XZ-V)
9.5 (min)
Figure 6: Chip Antenna PCB Footprint and Mechanical specifications
The DA14683 USB Kit provides a single-ended RFIO port matched to 50Ω. The RF port consists of the RFIOp and RFIOm pins, of which RFIOm is connected to ground. A copper trace with an impedance of 50Ω interconnects the RF port and the SMD chip antenna (ANT1). A T-network (Z3, L3, and L2) is added for antenna matching purposes.
Figure 7: RF matching circuit, SMD Chip antenna and SMA connector
The DA14683 USB kit provides an RF connector (no populated) in parallel with the SMD chip antenna. The RF connector can be used for conducted RF evaluation/testing. The RF connector type is 142-0761-861.
In order to perform RF measurements using the RF connector J10, users have to remove the resistor R89 (0Ω) and place the resistor R88 (0Ω).
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Figure 8: RF port, RF connector, RF matching and SMD Chip antenna
5.6.1 RF Measurements and Antenna Matching
RF measurements were performed to increase the efficiency of the ANT1. The values of the RF components are shown in Table 6. Radiation measurements results are shown in Figure 9 and
Figure 10.
Table 6: RF Components names and values
Component name
Component value
Manufacturer part number
Z3
10pF
C0402C100J5GACTU
L3
4nH
LQW15AN4N0B80D
L2
2.2nH
LQW15AN2N2G80D
ANT1 - 2450AT18A100E
Figure 9: Radiated measurements results - Standing position
-50
-30
-10
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0 0
0 0 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Standing [dBm]
vertical polarization
horizontal polarization
total
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Figure 10: Radiated measurements results - Laying position
5.7 QSPI Data Flash memory (U9)
The DA14683 USB kit includes an external QSPI Data Flash memory from Winbond. The W25Q80EW Flash memory supports the standard Serial Peripheral Interface (SPI), Dual/Quad I/O SPI as well as 2-clock instruction cycle Quad Peripheral Interface (QPI), Serial Clock, Chip Select, Serial Data I/O0 (DI), I/O1(D0), I/O2 (/WP), and I/O3(/HOLD). The power supply for QSPI can be selected from V33 or V18 with V18 being the default choice (Figure 11). The same supply voltage is also connected to the DA14683 VDDIO pin. The selected QSPI flash for the DA14683 USB kit is W25Q80EWSNIG in a SOIC package.
Figure 11: QSPI Flash with selectable power supply (V33 or V18)
The DA14683 uses the external Flash memory for directly executing code with some help from the internal cache, or simply for mirroring the contents in RAM during booting.
Termination resistors are placed between the processor and Flash memory. These resistors are not required, but they are placed there to mitigate any signal integrity issues.
-50
-30
-10
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0 0 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Laying [dBm]
vertical polarization
horizontal polarization
total
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5.8 Reset Circuit
Figure 12: Reset circuit
The DA14683 USB can be reset by pressing the on board RESET button (Figure 13) or through software from the UART & JTAG interface processor (U4, Figure 2, #7). The Reset push button (SW5) provides a high signal to the RST line of DA14683. U4 has a reserved logic (active low) compared to DA14683 (active high) and the inverter (NC7SZ04P5X) is used.
Figure 13: Reset push button
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5.9 Push Buttons
Figure 14: General purpose push buttons
Push buttons SW1 and SW2 are populated and placed on the top side of the board (Figure 15). SW1 is connected to P3_1 and SW2 is connected to P3_2 (Figure 14).
Switches SW3 and SW4 are not populated but placed in the bottom of the board (Figure 16). SW3 is connected to P4_2 and SW4 is connected to P4_3 (Figure 14).
Figure 15: General purpose push buttons SW1, SW2 (populated at TOP)
Figure 16: General purpose push buttons SW3, SW4 (no populated at BOTTOM)
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5.10 User Controlled LEDs
Figure 17: General purpose LEDs
The red LED D9 is driven from P1_2 and the white LED D10 is driven from P4_1 (Figure 18). Both are general purpose LEDs.
Figure 18: General Purpose LEDs D9 (red) & D10 (white)
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5.11 MikroBUS™ Module
Figure 19: MikroBus™ pin assignment and extra DA14683 I/O & Power output
The DA14683 USB kit can support MikroBUS™ modules. Users have to place and solder J6 and J7 sockets on the top side of the board as shown in Figure 20. The suggested female socket is the
PPTC081LFBN-RC, of which two pieces must be placed and soldered on the DA14683 USB Kit with
one to J6 from pin 4 to 11 and the other to J7 from pin 1 to pin 8. Do not use the pin1, pin2, and pin3 in J6 to connect a MikroBUS™ module with the DA14683 USB kit. These pins are extra I/O and power output of DA14683 and can be used for general purposes.
The position of J7 defines the proper pin alignment between the MikroBUS™ module and DA14683 USB Kit. Figure 21 shows the proper way to connect the MikroBus™ with the DA14683 USB Kit. The pin assignment is printed at bottom side of the DA14683 USB kit (Figure 22).
A MikroBUS™ module requires a power supply of 5V, 3.3V or both, depending on the module. A voltage of 5V is powered directly from USB port. A voltage of 3.3V can be supplied either from 3.3V LDO (U2 - default configuration) or V33 output of DA14683. In order to change the default configuration and supply the MikroBus™ module from V33 of DA14683, users have to remove R65 and place a 0Ω resistor to R64. The maximum current which can be provided to a MikroBus™ module is 150 mA from LDO (U2) and 80 mA from V33.
Figure 20: J6 and J7 female sockets (must be placed and soldered by users)
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Figure 21: Proper orientation and connection between DA14683 USB Kit and a MikroBus™
click board
Figure 22: MikroBus™ pin assignment
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5.12 GND Support Points
On the J9 (no populated, must be placed from the user) 2.54mm header, user can connect oscilloscope's probe for monitoring on-board voltages.
Figure 23: GND support point
Figure 24: GND support point (Male header must be placed from the user)
5.13 Over Voltage Protection Circuit (OVP)
The DA14683 USB kit can be used as a portable standalone device. The power supply can be a power-bank or a mobile charger. The OVP circuit can protect the device from overvoltage up to 20 V.
Figure 25 shows a schematic of the OVP circuit. Overvoltage is caused not only by the connection of
an unsuitable charger with different characteristics, but also from voltage surges caused by the length of the cables used to connect the charger to the device. For normal operations of the DA14683 USB Kit, the input voltage range have to be between 4.75 V and 5.25 V.
Figure 25: Over voltage protection circuit
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5.14 USB HUB
USB HUB is implemented by U1, USB2512B-AEZG. This chip is supplied with a voltage of 3.3 V from U2. The signal LDO_EN is generated from U1 and it is an active high signal. It enables the LDO (U3) which supplies the Segger chip. Operation is indicated via amber LED (D5). A 24MHz crystal (Y1) is required for the chip operation. Figure 26 shows the circuit's schematic.
Figure 26: USB HUB circuitry
5.15 Debugging Processor (U4)
Two debugging ports (JTAG and UART) are used on the DA14683 SoC. The USB-to-JTAG and USB-to-UART functions are implemented by the SAM3U2CA processor (U4)
(Figure 27), running the Segger JLink-OB firmware. The functions served by U4 are:
● Connecting PC to DA14683 JTAG port
● Connecting PC to DA14683 UART
● Reset the hardware through the T_RESET signal.
Note 1 The signal T_RESET is active LOW and therefore is inverted by U6 before reaching the RST pin on
DA14683.
The UART port supports hardware flow control (RTS/CTS). It is detected automatically by the J-Link­OB firmware, regardless of the setting on the host machine terminal. The behavior of the UART interface depends on the implementation in the J-Link-OB firmware and is subject to changes by Segger Microcontroller © with updates to the firmware. See Ref [2] for troubleshooting possible issues with the serial port.
The JTAG operating status is indicated via LED D6. The SAM3U2CA (U4) chip is supplied with a voltage of 3.3 V from U3. U3 is enabled by LDO_EN active high signal. A 12MHz crystal (Y2) is required for the chip operation. Figure 27 shows the circuit's schematic.
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Figure 27: Debugging processor - UART and JTAG interface
5.16 Power Section
DA14683 USB Kit is supplied directly from the USB port and it does not support external batteries.
Figure 28 shows the power tree.
USB Port
U2
LDO
3.3V
U3
LDO
3.3V
U10
LDO
3.3V
5V
Mikro
Bus
Segger
USB
HUB
DA14683
VBAT
R65
R64
V33
U6
Inverter
5V
SW6
VBUS
Figure 28: DA14683 USB Kit power tree
The following power components are placed on the DA14683 USB Kit:
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● U3: Fixed output 3.3V LDO. ○ It generates VDD_3V3_HUB voltage rail that supplies USB HUB.
● U4: Fixed output 3.3V LDO. ○ It generates VDD_3V3_SEG voltage rail that supplies the USB to JTAG/UART chip (U4,
ATSAM3U2CA-CU).
○ It is enabled from USB HUB through the signal LDO_EN. ○ If the USB HUB is not enumerated with external device (PC, Laptop, and so on), then the
LDO is not enabled. Consequently the debugging circuit is not functional.
Figure 29: Linear voltage regulators (LDOs) U3 and U4
● U10: Fixed output 3.3V LDO. ○ It generates 3.3V that supplies DA14683. ○ The DA14683 SoC can be supplied either from the USB port with a voltage of 5V to the
VBUS pin or through LDO (U10) with a voltage of 3.3V to the VBAT pin. The power selection is achieved through the switch SW6 (Figure 30, Figure 31). The maximum current for SW6 is 100mA. The default position of SW6 connects the VBUS pin of DA14683 with the USB port (5 V). Changes to SW configuration might be needed, depending on the SDK project and the power supply of DA14683 (VBUS or VBAT). More information about this is provided in section 6.
Figure 30: DA14683 power selection through SW6
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Figure 31: Power selection switch SW6 (default position to 5V)
Note 2 It is important to know that, different from DA14683 Pro MB or DA14683 Basic-DK to which an
external battery can be connected directly, the DA14683 USB Kit does not support external batteries.
6 Software Configuration
As mentioned in section 5.16, switching power supply of DA14683 between 5 V and 3.3 V depends on the software configuration and project requirements.
However, since there is no battery on the system, enabling the charger functionality is not recommended.
6.1 Using the DA14683 USB kit as a USB Device
When users/developers use the DA14683 USB kit as a USB device, the SW6 is turned to the 5V side to supply the chip through VBUS. In this case, a couple of limitations need to be taken into consideration when working with the SDK projects provided from Dialog Semiconductor.
This mode should be used when a USB application is being developed, for example, a USB-CDC application. It is not a suitable configuration for battery-powered applications or when the sleep mode needs to be used. The reason for this is that when the DA14683 is powered only by VBUS, the SDK must be aware of the existence of the VBUS and its power supply is provided through the USB instead of the VBAT.
Consequently, the operation mode of the DA14683 will be switched to "active mode" and the DCDC will be disabled. The DCDC should not be turned on when the device is running on VBUS, since it requires the VBAT2 which is not available.
The configuration to be used in the projects when the device is powered by the VBUS is:
● SW6 must be at default position (5V).
● To be able to use the pre-programmed CDC example, install the cdc_driver. The cdc_driver is
included in the mass storage which appears in your system when the USB-Kit is plugged in for the first time.
● Configure the project parameters in custom_config_qspi.h as follows: ○ #define dg_configUSE_SOC 0 ○ #define dg_configUSE_USB 1 ○ #define dg_configUSE_USB_CHARGER 0 ○ #define dg_configALLOW_CHARGING_NOT_ENUM 0 ○ #define dg_configUSE_NOT_ENUM_CHARGING_TIMEOUT 0
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● Optionally, change the sleep mode in main.c as follows: ○ pm_set_sleep_mode(pm_mode_active)
The limitations for this configuration are:
● The sleep mode is not available. If the extended sleep is enabled in the project, it will be
deactivated automatically by the SDK code.
● The DCDC cannot be used.
6.2 Using DA14683 USB kit as Development kit
When users/developers need to have full power save and/or battery-operated applications which do not include any USB or charging functionality, then the power supply of the DA14683 USB kit must be from VBAT.
For this mode:
● SW6 must be turned to 3V position (VBAT)
● All the SDK examples can be used and no extra software configuration is needed
The limitations in this mode are:
● The USB functionality will not work as the USB/VBUS is not available to trigger the enumeration
process
● The Charger functionality will not work as the USB/VBUS is not available to trigger the charging
FSM
The advantage of this mode is that the sleep mode is available and the DCDC can be used allowing the development and evaluation of low power applications.
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7 PCB Layout
Dimensions: 89 mm × 26.7 mm × 4.5 mm Number of layers: 4 PCB thickness: 1.55 mm Material: FR-4 Solder mask TOP/BOTTOM: Green Silkscreen TOP/BOTTOM: White Surface finish: Che Ni/Au
Figure 32: PCB cross section
The total thickness of the board is 1.55mm. The dielectric between each layer is shown in Figure 32.
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Appendix A
A.1 Schematics
Figure 33: USB Hub section
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Figure 34: UART & JTAG interface chip section
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Figure 35: DA14683 SoC section
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Figure 36: Mikrobus™ and peripherals section
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A.2 Bill of Materials (BOM)
Figure 37: Bill of materials (BOM)
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Revision History
Revision
Date
Description
1.0
28-May-2018
Initial version
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Status Definitions
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