Implementation file for the SparkFun INA228 high-precision power monitor driver. More...

#include "sfDevINA228.h"

Detailed Description

Implementation file for the SparkFun INA228 high-precision power monitor driver.

This file implements the INA228-only features: the 40-bit energy/charge accumulator reads. Calibration, the shared measurement methods, and the device-identity check are inherited from the sfDevINA2XX base template (see sfDevINA2XX.h), instantiated with the INA228 raw register types (int32_t / uint32_t).

INA228 ADC Details:

20-bit delta-sigma ADC
VSHUNT/VBUS/CURRENT registers are 24 bits wide; data is in bits [23:4], lower 4 reserved
POWER register is 24 bits wide, all bits used (unsigned)
ENERGY register is 40 bits wide (unsigned)
CHARGE register is 40 bits wide (two's complement)
Shunt LSB: 312.5 nV (ADCRANGE=0) or 78.125 nV (ADCRANGE=1)
Bus LSB: 195.3125 uV
Temp LSB: 7.8125 m-deg-C
Calibration scale: 13107.2 x 10^6 (x4 for ADCRANGE=1)

Author: SparkFun Electronics

Date: June 2026

Copyright: Copyright (c) 2026, SparkFun Electronics Inc. This project is released under the MIT License.

SPDX-License-Identifier: MIT

See also: https://github.com/sparkfun/SparkFun_INA2XX_Arduino_Library