This user’s guide describes the characteristics, operation, and use of the INA232, INA234 and INA236 evaluation modules (EVMs). These EVMs are designed to evaluate the performance of the INA232, INA234 and INA236. Throughout this document, the terms evaluation board, evaluation module, and EVM are synonymous with the INA232EVM, INA234EVM and INA236EVM. This document includes a schematic, reference printed circuit board (PCB) layouts, and a complete bill of materials (BOM).
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The INA23x devices are digital power monitors with integrated 16-bit (INA232, INA236) and 12-bit (INA234) delta-sigma ADCs specifically designed for current-sensing applications. The devices can measure a selectable full-scale differential input of ±81.92 mV or ±20.48 mV across the shunt with common-mode voltage support from –0.3 V to +48 V (–0.3 V to +28 V for INA234). The built-in digital accumulation calculates average power and current if calibration register is programmed. The INA23x devices also have built-in diagnostics to indicate system health accessible through a digital output pin, ALERT. The output can be interfaced with a multitude of micro controllers (MCUs) with a standard I2C interface.
| PRODUCT | DIGITAL PROTOCOL | ADC RESOLUTION | MAX GAIN ERROR | MAX OFFSET VOLTAGE |
|---|---|---|---|---|
| INA232 | I2C | 16-bit | 0.25% | ±20 µV |
| INA234 | I2C | 12-bit | 0.5% | ±100 µV |
| INA236 | I2C | 16-bit | 0.1% | ±5 µV |
