NXP Semiconductors QN9020 mini DK User manual

UM10895
QN9020 mini DK user guide
Rev. 4 — 12 November 2018 User manual
Document information
Info Content
Keywords mini DK, J-Link OB, UART, SWD, GPIO, LED, button, power supply,
buzzer
Abstract This user manual describes the features of the QN9020_MINIDK_Vx
board.

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User manual Rev. 4 — 12 November 2018 2 of 22
Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
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QN9020 mini DK user guide
Revision history
Rev Date Description
v.4 20181112 fixed Figure 10.
v.3 20180417 Updated Section 2.5, “QN9020 device”.
v.2 20160524 second release. Modifications:
•Section 1.2 “Additional resource” updated.
•Figure 5 updated.
•Section 2.6 “GPIO interface” updated.
•Section 3.1 “Schematics for QN9020 mini DK board” updated.
v.1 20150601 initial release

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QN9020 mini DK user guide
1. Introduction
This user manual describes the hardware details of the QN9020 mini Development Kit
(DK).
1.1 Kit contents
The QN9020 mini development kit includes the following:
•QN9020 mini development board
•QN9020 USB dongle
•USB cable
1.2 Additional resource
For additional resources, visit
http://www.nxp.com/products/microcontrollers-and-processors/more-processors/applicati
on-specific-mcus-mpus/bluetooth-low-energy-ble:BLUETOOTH-LOW-ENERGY-BLE
2. Hardware description
The QN9020 mini development board provides easy access to peripherals such as
buttons, piezo buzzer and LED. The board also provides useful interfaces such as a USB
port for UART communication and J-Link debug, and a GPIO/optional sensor board
connector.
A USB dongle is a Bluetooth device powered by the QN9020. It acts as a master when
communicating with the QN9020.
2.1 Hardware overview
The hardware blocks in the QN9020 mini DK, and the functional relationship of each main
component, are shown in Figure 1.

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QN9020 mini DK user guide
The component layout on both the sides of the board is shown in Figure 2 and Figure 3.
The detailed information of each component is listed in Table 1 .
Fig 1. The QN9020 functional diagram
Fig 2. The QN9020 board top view
aaa-018330
GPIO/SENSOR CONNECTOR GPIO/SENSOR CONNECTOR
GPIO/SENSOR CONNECTORBUTTON2
LED1
LED2
BUTTON1
RESET
Virtual UART
POWER
OnBoard
ANTENNA
RF
MATCHING
JLink OB
(ATSAM3U2C)
UART
SWD QN9020
CR2032
USB
PORT

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QN9020 mini DK user guide
Fig 3. The QN9020 board bottom view
Table 1. QN9020 board components list
Number Name Description
1 J-Link OB ATSAM3U2C; used to offer SWD and UART
interfaces for QN9020 debug and communication
2 connector optional; used for connecting sensor board
3 debug port debug port for ATSAM3U2CA
4 mini USB port power and communication port
5 power source select jumper used for power source selection; see Section 2.3
6 current measurement jumper used to measure the QN9020 device power
consumption
7 LDO (TPS73630) 5 V to 3 V regulator
8 button1 used as input; see Section 2.9
9 button2 used as input; see Section 2.9
10 LED2 used as output; see Section 2.8
11 QN9020 GPIO port used for interface extension
12 LED1 used as output; see Section 2.8
13 SWD resistors zero ohm resistors; shorted for QN9020 device
debug
14 UART interface used as communication port for QN9020 device
15 PCB antenna onboard Bluetooth antenna
16 QN9020 chip QN9020 chip
17 QN9020 reset button used for QN9020 hardware reset
18 CR2032 battery holder CR2032 battery holder
19 piezo buzzer buzzer: KLJ-1230
20 jumper used for power cycle ATSAM3U2CA

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2.2 Default jumper settings on mini DK board
The jumpers on QN9020 mini DK are factory set to power the board over the USB. The
factory-set jumper and switch settings are shown in Tab l e 2 .
2.3 Power supply
The QN9020 board has two power supply modes:
1. Bus-power mode: The board can be powered using the USB cable. The onboard LDO
is used to regulate output voltage to 3 V and supplies power to all parts on the board.
2. Battery-power mode: The CR2032 supplies power to QN9020 and optional sensor
connector when it is in battery-power mode. The J-Link OB still uses the LDO as
power supply via USB cable. When using USB interface as a power supply, connect
the jumper J11 pin 2 and pin 3; see Figure 4.
When using a CR2032 coin cell as a power supply, connect the jumper J11 pin 1 and
pin 2; see Figure 5.
Table 2. QN9020 mini DK board components list
Jumper Pins to be shorted using
jumpers
Function
J11 2 and 3 USB powered
J12 1 and 2 VCC_QN9020 3.3 V
J13 1 and 2 VCC_MB 3.3 V
Fig 4. Connecting jumper J11 pin 2 and pin 3 to select USB as power supply

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2.4 SEGGER J-Link OB part
The SEGGER J-Link OB offers the SWD and UART interface. Users can download or
update firmware into a QN9020 device by using the UART or SWD interface.
Furthermore, it is convenient to debug the program for a QN9020 device using SWD
interface.
To program or debug the QN9020 device using the SEGGER J-Link OB, the 0  resistors
R37, R38 should be soldered; see Figure 6.
Fig 5. Connecting jumper J11 Pin1 and Pin 2 to select CR2032 coin cell as power supply
Fig 6. Connect R37, R38

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In order to use a USB to UART bridge for the QN9020 download, the solder bridge SB3,
SB4 should be shorted; see Figure 7.
2.5 QN9020 device
The QN9020 device is integrated with a BLE radio, controller, protocol stack and profile
software, and a high performance MCU on a single chip; see Figure 8.
Fig 7. Short R35, R36
Fig 8. The QN9020 device

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2.6 GPIO interface
In QN9020 mini development board version V7, the connectors J6, J7, J8 and J9 provide
GPIO connection. The net name is shown in Figure 9.
In QN9020 mini development board version V8, connectors J6 and J7 provide GPIO
connection, as shown in Figure 10.
2.7 QN9020 reset button
The reset button is used to provide hardware reset to the QN9020 device. When
programming the QN9020 using UART interface of SEGGER J-Link OB, the reset button
should be pressed first to ensure that QN9020 is in boot mode. See Figure 11 for the
detailed circuit.
Fig 9. QN9020 version V7 GPIO connections
Fig 10. QN9020 version V8 GPIO connections
aaa-018338
1nRESET
J9
P3.0_ADC- 2
34
56
78
910
P3.1_ADC+P3.2_SPI0-MISO
P3.3_SPI0-MOSIP3.4_SPI0-CLK
P3.5_SPI0-CSP3.6
QN_VCC_3.3 VGND
1P0.0 UART0-TX
J6
P0.1_UART0-CTS 2
34
56
78
910
P0.2 UART0-RTSP0.3
P0.4P0.5
SWDIO/TMSSWCLK/TCK
QN_VCC_3.3 VGND
1P2.0_UART1-RX
J8
P2.1_UART1-TX 2
34
56
78
910
P2.2P2.3_I2C-SDA
P2.4_I2C-SCLP2.5
P2.6_PWMP2.7_PWM
GNDQN_VCC_3.3 V
1P1.0_SPI1-MISO
J7
P1.1_SPI1-MOSI 2
34
56
78
910
P1.2_SPI1-CSP1.3_SPI1-CLK
P1.4P1.5_PWM
P1.6_PWMP1.7_UART0-RX
GNDQN_VCC_3.3 V
Fig 11. QN9020 reset
aaa-018339
SW3
reset button
nRESET
12

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2.8 LED
The QN9020 board offers two programmable LEDs, which are connected to the QN9020
device GPIO.
LED1 and LED2 are connected to GPIO P0.4 and P0.5 respectively. The connections are
shown in Figure 12. The LEDs are powered-up when the corresponding GPIO outputs
switch to logic LOW level.
2.9 Button
The QN9020 board offers two buttons which are connected to QN9020 device GPIO.
Button 1 and button 2 are connected to GPIO P1.4 and P1.5 respectively. See Figure 13
for detailed circuits.
When using the buttons, the GPIO P1.4 and P1.5 must be configured as inputs. Logic
LOW input is applied to QN9020 when a button is pressed.
Fig 12. LED circuit
aaa-018340
R20
LED1
LED2
D2
D3 R21
470 Ω
470 Ω
QN_VIO
P0.5
P0.4
Fig 13. Button circuit
aaa-018341
R15
P1.4
P1.5
button 1
SW1
2
3
1
4
R18
100 kΩ
100 kΩ
QN_VIO
button 2
SW2
2
3
1
4