lamaPLC: Energy, power, current, and voltage
- INA226
- I²C topics on lamaPLC

lamaPLC: Energy, power, current, and voltage

INA226

36V, 16-bit, ultra-precise i²c output current/voltage/power monitor w/alert

The INA226 is a current shunt and power monitor with an I²C or SMBUS-compatible interface. It monitors both a shunt voltage drop and bus supply voltage. Programmable calibration values, conversion times, and averaging, combined with an internal multiplier, enable direct readouts of current in amperes and power in watts.

The INA226 is a current shunt and power monitor with an I²C or SMBUS-compatible interface. The device monitors both a shunt voltage drop and bus supply voltage. Programmable calibration value, conversion times, and averaging, combined with an internal multiplier, enable direct readouts of current in amperes and power in watts. The INA226 senses current on common-mode bus voltages that can vary from 0V to 36V, independent of the supply voltage. The device operates from a 2.7V to 5.5V supply, drawing a typical of 330μA of supply current. The device is specified over the operating temperature range between –40°C and 125°C and features up to 16 programmable addresses on the I2C-compatible interface.

The INA226 supports the transmission protocol for fast mode (1 kHz to 400 kHz) and high-speed mode (1 kHz to 2.94 MHz). All data bytes are transmitted most significant byte first.

Features

Senses Bus Voltages: 0 V .. 36 V
Shunt Voltage Maximum: 81.9 V
Current Maximum: 20 A
High-Side or Low-Side Sensing
Reports Current, Voltage, and Power
High Accuracy:
* 0.1% Gain Error (Max)
* 10 μV Offset (Max)
Configurable Averaging Options
16 Programmable Addresses
Operates from 2.7V to 5.5V Power Supply
10-Pin, DGS (VSSOP) Package

Pin Description

VBUS: bus voltage input
SDA/SCL: IIC bus data and clock signal lines
ALERT: Multi-function alarm output
A0/A1: I²C address line
IN+/IN-: non-inverting analog input, inverting analog input

Address

The sensor can have 16 different I²C addresses, which depend on how the A0 and A1 address lines are connected to the SCL, SDA, GND, and VCC pins.

Arduino / Github library

https://docs.arduino.cc/libraries/ina226/
https://github.com/RobTillaart/INA226
https://www.ti.com/product/INA226#tech-docs (Texas Instruments datasheet)

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