Laird BL654 User Manual page 6

Hide thumbs Also See for BL654:

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I2C device (RTC chip U16) via headers in series (no jumper by default)

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SPI device (EEPROM)

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QSPI device (Flash IC) via open solderbridges (by default)

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Four buttons and four LEDs for user interaction

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One reset button (via an analog switch)

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NFC antenna connector on-board development board for use with supplied flexi-PCB NFC antenna

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Optional external 32.768 kHz crystal oscillator and associated load capacitors. Not required for operation of the BL654;

is disconnected by open solder bridges by default.

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Optional external serial (QSPI) flash IC. Not required for operation of the BL654; is disconnected by open solder

bridges by default.

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Access to BL654 JTAG – also known as Serial Wire Debug (SWD)

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On-board SWD (JTAG) programmer circuitry (USB2 to BL654 module SWD interface)

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smartBASIC runtime engine FW upgrade capability:

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Via UART (using the FTDI USB1-UART)

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Via SWD (USB2 to BL654 SWD) using on-board JTAG programmer circuitry on the BL654 Development Kit

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smartBASIC application upgrade capability:

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Via UART (using the FTDI USB-UART)

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Via OTA (Over-the-Air)

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