https://www.lairdconnect.com/wireless-
modules/bluetooth-modules
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Atmel MCU by use of an analog switch to route the BL654PA UART (for those customers working with Nordic
SDK). USB2 to Atmel to Atmel UART (via open solderbridges) to BL654PA UART.
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Current measuring options (BL654PA module only):
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Pin header (Ammeter)
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10R Series resistor for differential measurement (oscilloscope)
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IO break-out 2.54 mm pitch pin header connectors (plated through-holes) that bring out all interfaces of the BL654PA
module
– UART, SPI, QSPI, I2C, SIO [DIO or AIN (ADCs)], PWM, FREQ, NFC – and allow for plugging in external
modules/sensors.
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Pin headers jumpers that allow the on-board sensors (I2C sensor, LEDs) to be disconnected from BL654PA module (by
removing jumpers).
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Four on-board sensors:
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Analog output temperature sensor via header in series (no jumper by default)
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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
BL654PA; is disconnected by open solder bridges by default.
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Optional
external serial (QSPI) flash IC. Not required for operation of the BL654PA; is disconnected by open solder
bridges by default.
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Access to BL654PA JTAG
– also known as Serial Wire Debug (SWD)
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On-board SWD (JTAG) programmer circuitry (USB2 to BL654PA module SWD interface)
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BASIC runtime engine FW upgrade capability:
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Via UART (using the FTDI USB1-UART)
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Via SWD (USB2 to BL654PA SWD) using on-board JTAG programmer circuitry on the BL654PA Development Kit
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BASIC application upgrade capability:
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Via UART (using the FTDI USB-UART)
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Via OTA (Over-the-Air)
Summary of Contents for BL654PA
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