X1200 Hardware

Interface Schematic

Raspberry Pi GPIO used

PIN#	GPIO	Functions
3	GPIO2	I2C-SDA, battery fuel-gauge systems -reading battery voltage and percentage
5	GPIO3	I2C-SCL, battery fuel-gauge systems -reading battery voltage and percentage
31	GPIO6	AC power loss & power adapter failture detection, Low-power supply failed, High-power supply OK
36	GPIO16	Control battery charging, High-charging disabled, Low-charging enabled

The UPS connects to the Pi GPIO via pogo pins, If the I2C address (0x36) is not detected or failed to read AC power state or failed to control charging, please ensure to clear the leads of the pins used on the GPIO header from the bottom of the Raspberry Pi PCB and then reinstall it.

Battery voltage level indicators

Battery voltage range (V)	D1	D2	D3	D4	Remark
3.87-4.2	ON	ON	ON	ON	discharging levels of 100%
3.7-3.87	ON	ON	ON	OFF	discharging levels of 75%
3.55-3.7	ON	ON	OFF	OFF	discharging levels of 50%
3.4-3.55	ON	OFF	OFF	OFF	discharging levels of 25%
Below 3.4	OFF	OFF	OFF	OFF	low battery