Power Pack Pro

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Raspberry pi power pack Pro versoin
Raspberry pi power pack UPS HAT Pro versoin

Overview

This is a power expansion Board especially designed for Raspberry Pi, which enables to use the Raspberry Pi with a moveable power source. It's more convenient to use external 3.7V Lithium battery or 3.7V 18650 Lithium battery;

Specifacation

Power-Pack-HAT-Pro-Spec.jpg

Features

  • Supports I2C Output with Capacity & Voltage Reading Function
  • Supports Raspberry pi or Android & Apple Phone or Pad or other electronic device charging;
  • Supports charging while discharging,(Very stable, the maximum output current can up to 1.8A while charging, but the chip heat will become larger. maybe you can place a external heatsilk on clip.)
  • With 4 LED power indicator;
  • Standard dimension of Raspberry Pi HAT;
  • Two power supply modes: GPIO power output and Micro USB power out (you can use OTG cable to connect it);
  • Removable battery, The external lithium battery requirements: 3.7V lithium battery;

  • Built-in power path management, perfect support charging While discharging.
  • Intelligent 3-stage charging (trickle, constant current, constant voltage), it can effectively extend the battery life.

  • Maximum discharge current: 2A, Maximum charge current: 1.8A;
  • Output protection: over current, short circuit, under voltage protection;
  • Input protection: over voltage, overcharge, under voltage protection;

Check I2C on Rasbperry pi

check if there is a I2C device;

sudo i2cdetect -y 1
i2cdump -y 1 0x62

0x62 is device address. You can see:0x0A address register default value is 0xC0

i2cset -y 1 0x62 0x0A 0x00

Wake-up the device I2C function; MODE register address 0x0A set to 0x00

i2cdump -y 1 0x62;

VCELL(cell voltage) address:0x02 - 0x03

PS: 0x62 is the device address of I2C device(CW2015 power monitoring chip)

How to read the voltage values that saved by chip register?

sudo i2cget -y 1 0x62 0x02 w

get the value 0xf82f; swap high and low byte to get 0x2ff8;

0x2ff8 converted to decimal number is 12280;

12280 * 305 = 3745400 uV

3745400/1000000 = 3.7454V

PS: 305 is a fixed value (Fix factor value);

How to read the remaining capacity (percentage) estimated by the chip?

1. Read the integer part of the battery percentage;

sudo i2cget -y 1 0x62 0x4 b

the resulting value is 0x11;

Converted to 10 decimalism is 17, then the remaining capacity is 17%;

2. Read the fractional part of the battery percentage

sudo i2cget -y 1 0x62 0x5 b

the resulting value is 0x95;

Converted to decimalism is 149;

Then the fractional part is 149/256 = 0.58;

So the chip estimated remaining capacity (percentage) is 17.58%.

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