16-bit digital current monitor

Mar 3 2023 2023-03 Power Texas Instruments

Texas Instruments INA232 Current/Voltage/Power Monitor is a 16-bit digital current monitor with an I2C/SMBus compatible interface. Compatible with a wide range of digital bus voltages such as 1.2V, 1.8V, 3.3V, and 5.0V, the device also monitors voltage across external detection resistors and reports current, bus voltage, and power values.

The INA232 has programmable ADC conversion time and average calculation capabilities. The device also has programmable calibration values that, when used in conjunction with an internal multiplier, directly read current values in amperes and power values in watts. The device monitors the bus voltage on the In-pin and can issue alarms IN the event of overcurrent/undercurrent and overvoltage/undervoltage. Because of the high input impedance in current measurement mode, small value system currents can be measured using the larger current detection resistance required.

The Texas Instruments INA232 can detect current against common-mode bus voltage ranging from -0.3V to 48V independent of the supply voltage. The device uses a single power supply of 1.7V to 5.5V, with a typical supply current of 300µA in normal operation. The device can be placed in low-power standby mode, where the typical operating current is 2.2µA.

Features

● High side or low side current detection
● Powered by 1.7V to 5.5V power supply
● Report current, voltage and power values
● Programmable full scale range: 20mV/80mV
● Input total model circumference: -0.3V to 48V
● Current monitoring accuracy
- 16-bit ADC resolution
- Gain error: 0.3% (Max.)
- Offset voltage: 50µV (Max)
● Low input bias current: 10nA (Max.)
● A configurable averaging option
● Universal call addressing supports conversion synchronization between devices
● Alarm limits for overcurrent and undercurrent events
● 1.2V Compatible with I2C and SMBus interfaces
● Two device address options with four pin optional addresses
● SOT23-8 package
● Operating temperature range: -40 °C and +125°C

Applications

● Intelligent speaker
● Battery charger
● Power management
● Battery unit monitor and weigher
● Rack server

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