The smartBASIC application for this external optional serial QSPI flash IC will be available in the future in the GitHub
smartBASIC sample application repository: https://github.com/LairdCP/BL654-Applications
The BL654 on-chip 32.768kHz RC oscillator provides the standard accuracy of ±250 ppm, with calibration required every 8
seconds (default) to stay within ±250 ppm.
The BL654 also allows, as an option, to connect an external higher accuracy (±20 ppm) 32.768 kHz crystal to the BL654-SX-
xx pins SIO_01/XL2 (pin 41) and SIO_00/XL1 (pin 42). This provides improved protocol timing and helps with radio power
consumption in the system standby doze/deep sleep modes by reducing the time that the Rx window must be open.
To connect the optional external 32.76kHz crystal oscillator circuit to the BL654 module, remove R127 and R128 and short
SB8 and short SB9.
Figure 20: Optional external 32.768kHz crystal circuit schematic and PCB
A smartBASIC application will be available in the future in the GitHub smartBASIC sample application repository at:
https://github.com/LairdCP/BL654-Applications.
To Next Page
Loading...
