Laird BL654 - Understanding the Development Board

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Figure 1: Dev board contents and locations
Figure 2: Development board 455-00001 (fitted with 451-00001 BLE module with integrated antenna)
SW7 select Normal
(VDD) or High
(VDD_HV) operation
SW8 Select
between 2.5V or
3xAAA(4.5V)
On-board SWD
interface and
programmer
circuitry
I2C device
U16
SPI EEPROM
device
J41 PTH
J47 PTH
J29 PTH
4 Buttons
USB1
NFC Antenna
Connector CON2
USB2
connector
USB-SWD
interface
DC Jack
5.5V DC
max input
CON1
USB3 connector
BL654 nRF USB
device
F USB I/F
Optional Serial
QSPI flash
J48 PTH
FTDI-FT232R
DC/USB
Power Source
Switch
SW4
Header J12
for nAutoRUN
J35
J1 Header Plated
Through Holes
(PTH) for UART
Temperature
Sensor
TP14 GND
Hook
LED2 LED1 LED3 LED 4
J37 J26 J45 J39
J5 (VSP)
Optional
32.768 kHz
Crystal
SW3 nReset
/BOOT Button
J7 (VDD)
Current
Measurement
J9 (VDD_HV)