====== Powering the T-Zigbee Unit ======

The T-Zigbee unit contains a AP5054B Lipo charing chip that is powered from the USB port. 

{{ :tzigbee-power-supply.png?400 |}}

This can be used to charge a 3.7V Lipo battery connected to the device using a USB cable connected to the USB-C port. The battery is connected via the power cable included in the box:

{{ :tzigbee-power-cable.png?400 |}}

From the battery there are two linear regulators supplying power to the ESP32 and the Zigbee radio module.

{{ ::tzigbee-power-regulators.png?600 |}}

The chip powering the Zigbee module has its enable pin connected to the ESP32, so the ESP32 can power the Zigbee module on/off.

The maximum input voltage for the regulators is 5.5V, so take care not to attach batteries of a higher voltage.