Laird BL654 User Manual page 7

Header J12
for nAutoRUN
FTDI-FT232R
USB1
DC/USB
Power Source
Switch
SW4
DC Jack
5.5V DC
max input
SW8 Select
CON1
between 2.5V or
3xAAA(4.5V)
Figure 1: Dev board contents and locations
Figure 2: Development board 455-00001 (fitted with 451-00001 BLE module with integrated antenna)
www.lairdtech.com/bluetooth
J1 Header Plated
Through Holes TP14 GND
J35
(PTH) for UART Hook
SW3 nReset 4 Buttons
/BOOT Button
SW7 select Normal
(VDD) or High
(VDD_HV) operation
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SPI EEPROM
device
Temperature
Sensor
J5 (VSP)
I2C device
U16
USB2
On-board SWD
connector
interface and
USB-SWD
programmer
interface
circuitry
7
NFC Antenna
Connector CON2
Optional
32.768 kHz
Crystal
J48 PTH
J7 (VDD)
Current
Measurement
J9 (VDD_HV)
J29 PTH
J41 PTH
J47 PTH
Optional Serial
QSPI flash
LED2 LED1 LED3 LED 4
J37 J26 J45
USB3 connector
BL654 nRF USB
device
F USB I/F
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J39