Texas Instruments INA232AIDDFR

Overview

INA232AIDDFR from Texas Instruments is a 16-bit digital current, voltage, and power monitor IC with I²C/SMBus interface, designed for high-side or low-side shunt-based sensing in systems with bus voltages up to 48 V. It delivers ±50 µV shunt offset, 0.3% gain error, and operates from 1.7 V to 5.5 V supply while supporting –40°C to +125°C ambient temperature - enabling precision power monitoring in battery chargers and rack servers.

For engineers reviewing the INA232AIDDFR datasheet, INA232AIDDFR pinout, INA232AIDDFR application, or INA232AIDDFR equivalent, key selection criteria include its programmable 20 mV/80 mV full-scale shunt range, 1.2-V–compliant I²C interface, dual alert limit configuration (shunt/bus/power), and SOT-23-8 package compatibility with space-constrained PCB layouts.

Technical Context

The INA232AIDDFR integrates a 16-bit delta-sigma ADC multiplexed across shunt voltage (IN+ to IN–) and bus voltage (IN– to GND) inputs, with independent conversion-time programming (140 µs to 8.24 ms) and configurable averaging (1× to 1024×). Its input common-mode range spans –0.3 V to 48 V, decoupled from the 1.7–5.5 V supply rail.

It implements real-time power calculation using internally stored calibration values to output current in amperes and power in watts directly. The ALERT pin supports five selectable alert functions - shunt over/under-limit, bus over/under-limit, and power over-limit - each with dedicated threshold registers and open-drain assertion logic.

Key Specifications

Pinout & Package

SOT-23-8 (DDF) package: 1.60 mm × 2.90 mm body size, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current/voltage/power monitoring applications.

Compared with INA226AIDRCT and INA233AIDDFR, the INA232AIDDFR uniquely balances 48-V common-mode capability, 1.2-V I²C compatibility, and 2.2 µA standby current - making it optimal for space- and power-constrained 48-V battery and server applications where SPI is not needed.

Availability

INA232AIDDFR is available at Aetrix Electronics and suitable for battery chargers, rack servers, and smart speaker power management systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for INA232AIDDFR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal chain and power management ICs.

The INA232AIDDFR belongs to TI's high-accuracy current-sense monitor product line, engineered specifically for real-time, multi-parameter power telemetry in 48-V systems where supply voltage independence and low-power operation are critical.

FAQ

What is the maximum common-mode voltage the INA232AIDDFR can measure?

The INA232AIDDFR supports a common-mode input range of –0.3 V to 48 V on the IN+ and IN– pins, independent of its 1.7–5.5 V supply voltage. This allows direct monitoring of 48-V battery rails or intermediate bus voltages without external level-shifting circuitry, and remains valid across the full –40°C to +125°C operating temperature range as specified in Section 6.3 of the SBOSAA2 datasheet.

Does the INA232AIDDFR support both high-side and low-side current sensing configurations?

Yes, the INA232AIDDFR supports both high-side and low-side shunt configurations. For high-side sensing, IN+ connects to the bus voltage and IN– connects to the load side of the shunt; for low-side, IN+ connects to the load and IN– connects to system ground. The device maintains ±50 µV offset and 0.3% gain error in either configuration, as confirmed in the Functional Description (Section 7.3.1) and Pin Functions table (Section 5) of the INA232AIDDFR datasheet.

How does the INA232AIDDFR calculate power, and what units does it report?

The INA232AIDDFR calculates power internally using the formula P = I × V, where I is the calibrated current value (in amperes) derived from shunt voltage and the calibration register, and V is the latest bus voltage reading (in volts). It reports power directly in watts via the Power Register (0x05), eliminating host-side computation. This behavior is enabled by the internal multiplier and documented in Section 7.3.2 (Power Calculation) and Register Maps (Section 7.6) of the SBOSAA2 datasheet.

Can the INA232AIDDFR operate from a 1.8-V supply and interface with a 1.2-V I²C host?

Yes, the INA232AIDDFR operates from 1.7 V to 5.5 V and features a 1.2-V–compliant I²C interface, meaning its SDA and SCL pins accept 1.2-V logic thresholds and are compatible with 1.2-V, 1.8-V, 3.3-V, and 5.0-V hosts without level shifters. This is explicitly stated in the Features list and verified in Section 6.5 (Digital Input/Output) and Section 6.6 (I²C Timing) of the SBOSAA2 datasheet.

What are the two device address options for the INA232AIDDFR, and how are they selected?

INA232AIDDFR offers two base I²C addresses: 0x40 (device A) and 0x41 (device B), selected by ordering part number suffix (AIDDFR vs. BIDDFR). Each variant supports four additional addresses via the A0 pin (tied to GND, VS, SCL, or SDA), yielding up to eight unique addresses per variant. This addressing scheme is defined in Table 7-1 and Pin Function description for A0 (Section 5) of the SBOSAA2 datasheet.