1 Overview ............................................................................................................................................................................. 4
2 Laird BL654 Development Kit Part Numbers ...................................................................................................................... 4
3 Package Contents ................................................................................................................................................................ 4
4 BL654 Development Kit – Main Development Board ......................................................................................................... 5
5 Understanding the Development Board ............................................................................................................................. 7
5.1 BL654 Default Configuration and Jumper Settings .................................................................................................... 8
6 Functional Blocks ................................................................................................................................................................ 9
6.1 Power Supply ............................................................................................................................................................. 9
6.2 Reset Button ............................................................................................................................................................ 14
6.3 SWD (JTAG) Interface ............................................................................................................................................... 15
6.4 Four-wire UART Serial Interface .............................................................................................................................. 17
6.5 UART Mapping ......................................................................................................................................................... 17
6.6 nAutoRUN Pin and Operating Modes ...................................................................................................................... 19
6.7 Virtual Serial Port Modes and Over-the-Air smartBASIC App Download ................................................................ 20
7 Software ............................................................................................................................................................................ 21
8 Breakout Connector Pinouts ............................................................................................................................................. 22
8.1 SIO (Special Input/Output Sockets) Breakout Connectors ...................................................................................... 22
8.2 Additional Peripherals/Sensors ............................................................................................................................... 27
8.2.1 Temperature Sensor .......................................................................................................................................... 27
8.2.2 I2C Sensor (RTC Chip) ......................................................................................................................................... 29
8.2.3 SPI Device EEPROM ............................................................................................................................................ 30
8.2.4 Push Button and LED Connected to BL654 ........................................................................................................ 30
8.2.5 NFC External Antenna Connector and NFC Antenna RF Matching Circuit ......................................................... 32
8.2.6 Optional External Serial QSPI Flash IC ................................................................................................................ 33
8.2.7 Optional 32.76 kHz Crystal ................................................................................................................................. 34
9 Other Features .................................................................................................................................................................. 35
9.1 Current Consumption Measurement ...................................................................................................................... 35
10 Appendix ........................................................................................................................................................................... 36
10.1 Coin Cell Insertion .................................................................................................................................................... 36
10.2 Coin Cell Removal .................................................................................................................................................... 37
11 Additional Documentation ................................................................................................................................................ 38
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