INA231 - 28V, Bi-Directional, Low-/High-Side, I2C Out Current/Power Monitor w/Alert in WCSP

The INA231 is a current-shunt and power monitor with a 1.8-V compliantI²C interface that features 16 programmable addresses. The INA231monitors both shunt voltage drops and bus supply voltage, providing increased protection byasserting the ALERT pin if the values are outside the programmed range. Programmable calibrationvalue, conversion time, and averaging, combined with an internal multiplier, enable direct readoutsof current in amperes and power in watts, thus reducing host processing.

The INA231 senses current on bus voltages that vary from 0 V to 28 V, with the devicepowered from a single 2.7-V to 5.5-V supply, drawing 330 µA (typical) of supply current. The INA231is specified over the operating temperature range of –40°C to +125°C.

The INA231 is available in two versions: the INA231A starts up performing continuousconversions of the shunt and bus voltage, whereas the INA231B starts up in low-current, power-downmode.

• Bus Voltage Sensing From 0 V to 28 V
• High- or Low-Side Sensing
• Current, Voltage, and Power Reporting
• High Accuracy:
  • 0.5% Gain Error (Max)
  • 50-µV Offset (Max)
• Configurable Averaging Options
• Programmable Alert Threshold
• 1.8-V I²C Compliant
• Power-Supply Operation: 2.7 V to 5.5 V
• Start-Up Mode Options:
  • INA231A: Active Conversion
  • INA231B: Low-Current Power Down

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