Dialog Semiconductor DA14683 USB Kit User manual

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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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 50Ωinterconnects 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
00000000000000
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
0000000000000
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
00000000000000
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
0000000000000
Laying [dBm]
vertical
polarization
horizontal
polarization
total

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DA14683 USB Kit
Company Confidential
User Manual
Revision 1.0
28-May-2018
CFR0012
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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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DA14683 USB Kit
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User Manual
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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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DA14683 USB Kit
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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)