bq769x0-arduino-library

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bq769x0-arduino-library

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Arduino-compatible library for battery management system based on Texas Instruments bq769x0 analog frontend (bq76920, bq76930 and bq76940)

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bq769x0.cpp
bq769x0.h
keywords.txt
LICENSE
README.md
registers.h

// repository documentation

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**IMPORTANT**: This library is unmaintained. Use it at your own risk.

# bq769x0 Arduino Library

Arduino-compatible library for battery management system based on Texas Instruments bq769x0 IC (bq76920, bq76930, and bq76940).

This library offers most features for a simple BMS (including automatic fault handling and balancing). See also BMS48V hardware files.

## Example Arduino sketch

```C++
#include <bq769x0.h>    // Library for Texas Instruments bq76920 battery management IC

#define BMS_ALERT_PIN 2     // attached to interrupt INT0
#define BMS_BOOT_PIN 7      // connected to TS1 input
#define BMS_I2C_ADDRESS 0x18

bq769x0 BMS(bq76920, BMS_I2C_ADDRESS);    // battery management system object

void setup()
{
  int err = BMS.begin(BMS_ALERT_PIN, BMS_BOOT_PIN);

BMS.setTemperatureLimits(-20, 45, 0, 45);
  BMS.setShuntResistorValue(5);
  BMS.setShortCircuitProtection(14000, 200);  // delay in us
  BMS.setOvercurrentChargeProtection(8000, 200);  // delay in ms
  BMS.setOvercurrentDischargeProtection(8000, 320); // delay in ms
  BMS.setCellUndervoltageProtection(2600, 2); // delay in s
  BMS.setCellOvervoltageProtection(3650, 2);  // delay in s

BMS.setBalancingThresholds(0, 3300, 20);  // minIdleTime_min, minCellV_mV, maxVoltageDiff_mV
  BMS.setIdleCurrentThreshold(100);
  BMS.enableAutoBalancing();
  BMS.enableDischarging();
}

void loop()
{
  BMS.update();  // should be called at least every 250 ms
  BMS.printRegisters();
}
```

## What's changed from the original upload (as of September 2019)

- Now supports CRC (thanks to mikethezipper)
- Automatically finds bq769x0 address and CRC
- Tested on bq76940

## To Do list

- Proper SOC estimation and coloumb counter implementation
- Testing for ICs with more than 5 cells
- Software protection for charge overcurrent

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