BLE 5, Thread, Zigbee Modules, BT840/F/E/X/XE
Ver 1.16 Dec.. 2019
3. Portable smartphone charger can be used to power this board. The circuitry to the left of micro USB
connector, J16 produces periodic load to prevent portable smartphone charger from shutting down.
Suggestion for Battery Power Application
Standby current consumption is important for battery-powered product. We suggest adding a 32.768 kHz
crystal and 2 capacitors on host board. The 32MHz main clock won’t be active at idle state to save power.
Two inductors required for on-board DC to DC converter are inside BT840F. You can enable DCDC converter
to have lower power consumption.
27
