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Description

The Power Management HAT is a smart power bank designed for Raspberry Pi. With the embedded Arduino MCU and RTC, the HAT features auto power management function which allows the Pi to work more power-efficient and more safely.

If you’re looking for some convenient utilities for your long-term working Raspberry Pi, such as longer battery life, or auto power on-off control, this Power Management HAT would be the ideal choice.

By auto starting up on a specified period, and auto shutdown at other times, the HAT can greatly save battery life. It will monitor the operating voltage/current status of the Raspberry Pi in real-time and can be configured to shut the Pi down according to the operating status. What’s more, it comes with a handy power switch for easy on or off (safely shutdown the Pi by software), to avoid data loss caused by unplugging the power supply.

Features

Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards
Onboard ATmega328P MCU, supports Arduino programming
Onboard PCF8523 RTC chip, provides precise RTC information
Onboard CP2102 UART converter, for UART communication or ATmega328P programming
The user-defined button can be used for Raspberry Pi startup, safely shutdown, or other customized function
Protection circuits such as power supply anti-reverse, counter-current proof, etc. ensure stable and safe operating
Voltage/current monitoring circuit monitors the Raspberry Pi operating voltage and current in real-time
Comes with development resources and manual

Specification

Controller: ATmega328P-AU
Communication interface: UART + GPIO
Baudrate: 115200bps by default (programmable)
Power supply interface: USB port or PH2.0 connector
USB power input voltage: 5V
PH2.0 power input voltage: DC 7~28V (regulated power supply or lithium battery)
Embedded circuits: power supply anti-reverse, counter-current proof, voltage monitoring, current monitoring
Mounting hole size: 3.0mm

What’s on Board

1.ATmega328P-AU MCU
2.MP1584 power manager
3.PCF8523 RTC chip
4.CP2102 UART converter
5.CAT24C32: EEPROM storage chip
6.Raspberry Pi GPIO connector: for connecting Raspberry Pi
7.PH2.0 connector: for 7~28V regulated power supply or lithium battery
8.USB TO UART: for power input or UART communication
9.DEBUG switch:

DEBUG side: power supply will bypass the Arduino and directly provides to Raspberry Pi
the opposite side: power supply is managed by Arduino

10.PWR button: for Raspberry Pi power on/off, or user-defined function
11.RST button: Arduino reset
12.Status indicator
13.Power indicator
14.CR1220 button battery holder
15.UART selection:

A: access Arduino via USB to UART
B: control the Raspberry Pi by Arduino
C: access Raspberry Pi via USB to UART