The Texas Instruments INA226 is a state-of-the-art current shunt and power monitor that features an I2C- or SMBUS-compatible interface. This device is capable of monitoring both a shunt voltage drop and bus supply voltage. It boasts a programmable calibration value, conversion times, and averaging. Coupled with an internal multiplier, it can provide direct readouts of current in amperes and power in watts. The INA226 can sense current on common-mode bus voltages from 0 V to 36 V, irrespective of the supply voltage. It operates from a single 2.7-V to 5.5-V supply, typically drawing 330 µA of supply current. The device operates within a temperature range of –40 °C to 125 °C and offers up to 16 programmable addresses on the I2C-compatible interface.
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