Specifications

https://www.lairdconnect.com/wireless-
modules/bluetooth-modules/bluetooth-5-
modules/bl654-series-bluetooth-module-nfc
6
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Categories/Feature
Implementation
Host Interfaces and Peripherals
Total
48 x multifunction I/O lines
UART
2 UARTs
Tx, Rx, CTS, RTS
DCD, RI, DTR, DSR (See Note 2Note 1 in the Module Specification Notes)
Default 115200, n, 8, 1
From 1,200 bps to 1 Mbps
USB
USB 2.0 FS (Full Speed, 12Mbps).
CDC driver / Virtual UART (baud rate TBD)
Other USB drivers available via Nordic SDK
GPIO
Up to 48, with configurable:
I/O direction,
O/P drive strength (standard 0.5 mA or high 3mA/5 mA),
Pull-up /pull-down
Input buffer disconnect
ADC
Eight 8/10/12-bit channels
0.6 V internal reference
Configurable 4, 2, 1, 1/2, 1/3, 1/4, 1/5 1/6(default) pre-scaling
Configurable acquisition time 3uS, 5uS, 10uS (default), 15uS, 20uS, 40uS.
One-shot mode
PWM Output
PWM outputs on 16 GPIO output pins.
▪ PWM output duty cycle: 0%-100%
▪ PWM output frequency: Up to 500kHz
FREQ Output
FREQ outputs on 16 GPIO output pins.
▪ FREQ output frequency: 0 MHz-4MHz (50% duty cycle)
I2C
Two I2C interface (up to 400 kbps) – See Note 3 in the Module Specification Notes
SPI
Four SPI Master Slave interface (up to 4 Mbps)
QSPI
One 32-MHz QSPI interface. Gives XIP (Execution in Place) capability.
External serial flash IC must be fitted as per Nordic specifications.
Temperature Sensor
One temperature sensor.
Temperature range equal to the operating temperature range.
Resolution 0.25 degrees.
RSSI Detector
One RF received signal strength indicator
±2 dB accuracy (valid over -90 to -20 dBm)
One dB resolution
I2S
One inter-IC sound interface
PDM
One pulse density modulation interface
Optional (External to the BL654 module)
External 32.768 kHz crystal
For customer use, connect +/-20ppm accuracy crystal for more accurate protocol
timing.