User Manual

The following pins are included as part of the WICED Feather's power system:

3V: The output of the on-board 3.3V 600mA voltage regulator

RTC: The input for the realt-time clock (RTC) on the STM32F205 (optional)

GND: The common/GND pin which should be connect to GND on any other boards you use

BAT: The input for the 3.7V LIPO cell

EN: The 'EN' switch for the 3.3V voltage regulator. Set this to GND to disable power.

VUSB: The 5V USB power input (USB VBUS)

A1: This pin is optionally connected to a 10K+10K voltage divider that allows you to safely measure the output of

the LIPO cell using the internal ADC (analog to digital converter).

LIPO Cell Power Monitoring (A1)

The LIPO battery level can optionally be monitored via a voltage divider configured on ADC pin A1.

To enable the 10K + 10K voltage divider (which will divide the LIPO voltage levels in half so that the ADC pin can safely

read them), you need to solder shut the BATADC solder jumper on the bottom of the PCB:

This will allow you to read the voltage level of the LIPO cell using pin A1 where each value on the ADC is equal

to 0.80566mV since:

3300mV / 4096 (12-bit ADC) = 0.80566406mV per LSB