INA231 Texas instruments

INA231

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INA231

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Описание

The INA231 is a current-shunt and power monitor with a 1.8-V compliant I2C interface that features 16 programmable addresses. The INA231 monitors both shunt voltage drops and bus supply voltage, providing increased protection by asserting the ALERT pin if the values are outside the programmed range. Programmable calibration value, conversion time, and averaging, combined with an internal multiplier, enable direct readouts of 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 device powered from a single 2.7-V to 5.5-V supply, drawing 330 µA (typical) of supply current. The INA231 is specified over the operating temperature range of –40°C to +125°C.The INA231 is available in two versions: the INA231A starts up performing continuous conversions of the shunt and bus voltage, whereas the INA231B starts up in low-current, power-down mode.

Bus voltage sensing from 0 V to 28 V
High- or low-side sensing
Current, voltage, and power reporting
High accuracy:
- Gain error: 0.5% (maximum)
- Offset: 50 µV (maximum)
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

Common-mode voltage (max) (V)	28
Common-mode voltage (min) (V)	0
Input offset (±) (max) (µV)	50
Input offset drift (±) (max) (µV/°C)	0.1
Input offset drift (±) (typ) (µV/°C)	0.1
Voltage gain (V/V)	1
CMRR (min) (dB)	100
Bandwidth (kHz)	3.5
Supply voltage (max) (V)	5.5
Supply voltage (min) (V)	2.7
Iq (max) (mA)	0.42
Digital interface	I2C, SMBus
Gain error (%)	0.5
Gain error drift (±) (max) (ppm/°C)	50
Features	Alert Function, Bi-directional, Integrated Power Monitor, Low-side Capable
Number of channels	1
Resolution (Bits)	16
Power measurement accuracy (%)	1
Rating	Catalog
Operating temperature range (°C)	-40 to 125