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Overview ............................................................................................................................................................................. 4
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Laird BL654 Development Kit Part Numbers ...................................................................................................................... 4
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Package Contents ................................................................................................................................................................ 4
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BL654 Development Kit
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Main Development Board ......................................................................................................... 5
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Understanding the Development Board ............................................................................................................................. 7
5.1
BL654 Default Configuration and Jumper Settings .................................................................................................... 8
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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
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Software ............................................................................................................................................................................ 21
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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
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Other Features .................................................................................................................................................................. 35
9.1
Current Consumption Measurement ...................................................................................................................... 35
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Appendix ........................................................................................................................................................................... 36
10.1
Coin Cell Insertion .................................................................................................................................................... 36
10.2
Coin Cell Removal .................................................................................................................................................... 37
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Additional Documentation ................................................................................................................................................ 38
Summary of Contents for BL654
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