Power Management HAT (B)

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Power Management HAT (B)
Power Management HAT (B).jpg

RPI, USB, UART, GPIO
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Overview

Introduction

Power Management HAT(B) is a Raspberry Pi power management control board, which can provide a set of extremely powerful power management for Raspberry Pi, such as timing switches, measuring working voltage and current, etc. The load transient response function enables fast switching among multiple power supplies.

Feature

  • Onboard MCU (RP2040), powerful and easy to use.
  • Onboard PCF8523 RTC chip, provides precise RTC information.
  • Onboard MP28167-A buck-boost DC chip for fast load transient response.
  • Protection circuits such as power supply anti-reverse, counter-current proof, etc. ensure stable and safe operating.
  • Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards.
  • Onboard user-defined button, can be used for Raspberry Pi start-up, safe shutdown, or other customized functions.
  • It can detect the input power supply voltage and the working current, and it can be programmed to cut off the power supply immediately to ensure the working life of the lithium battery.
  • Voltage/current monitoring circuit, monitors the Raspberry Pi operating voltage and current in real-time.

Parameters

  • Main chip: RP2040
  • Communication interface: UART + GPIO
  • Download interface: USB + SWD (debug)
  • Baud rate: default 115200bps (configurable)
  • Power supply: USB/PH2.0 connector
  • USB port voltage: 5V
  • PH2.0 connector voltage: 3.3-4.2V (3.7V Li battery (NOT included))
  • Built-in circuits: battery anti-reverse, counter-current proof, voltage/current monitoring
  • Dimensions: 56.5mm x 65mm
  • Fixed hole diameter: 3.0mm

Hardware Connection

RP2040 GPIO Description
GPIO0 UART0_TX pin, connect to Raspberry Pi D15 pin
GPIO1 UART0_RX pin, connect to Raspberry Pi D14 pin
GPIO6 I2C1_SDA pin, connect to II2 SDA pin
GPIO7 I2C1_SCL pin, connect to II2 SCL pin
GPIO19 User key pin, generally for controlling the power switch
GPIO21 RTC interruption pin, RTC chip will be pulled down when the RTC clock is triggered
GPIO22 Raspberry Pi soft shutdown pin, connect to Raspberry Pi D20 pin
GPIO23 Raspberry Pi run pin, connect to Raspberry Pi D21 pin
GPIO24 Power control pin, when it is pulled low, the power is cut off, otherwise, the power is on
GPIO25 Status LED pin, used to display the current operating status
GPIO29 Input voltage acquisition hardware, the voltage here is about 1/10 of the input voltage