INA234 28-V, 12-Bit, Current, Voltage, and Power Monitor With an I2C Interface

1 Features

• High-side or low-side current sensing

• Operates from a 1.7-V to 5.5-V power supply

• Reports current, voltage and power

• Programmable full scale range: 20mV / 80mV

• Input common mode range: –0.3 V to 28 V

• Current monitoring accuracy:

– 12-bit ADC resolution

– 0.5% gain error (maximum)

– 100-µV offset (maximum)

• Low input bias current: 10 nA (maximum)

• Configurable averaging options

• General call addressing allows conversion

synchronization among devices

• Alert limits for over and under current events

• 1.2-V compliant I2C, SMBus interface

• Two device address options with a 4-pin selectable

address

• DSBGA-8 Package (0.745 mm × 1.508 mm)

• Operating temperature: –40°C and +125°C

2 Applications

• Mobile phones

• Smart speakers

• Wearables

• Battery chargers

• Power management

• Battery cell monitors and balancers

• Rack servers

3 Description

The INA234 device is a 12-bit digital current monitor

with an I2C/SMBus-compatible interface that is

compliant with a wide range of digital bus voltages

such as 1.2 V, 1.8 V, 3.3 V, and 5.0 V. The device

monitors the voltage across an external sense resistor

and reports values for current, bus voltage, and

power.

The INA234 features programmable ADC conversion

times and averaging. The device also has a

programmable calibration value with an internal

multiplier that enables direct readouts of current in

amperes and power in watts. The device monitors

the bus voltage present on the IN– pin and can

alert on overcurent and undercurrent conditions as

well as overvoltage and undervoltage conditions. High

input impedance while in current measurement mode

allows use of larger current sense resistors needed to

measure small value system currents.

The INA234 senses current on common-mode bus

voltages that can vary from –0.3 V to 28 V,

independent of the supply voltage. The device

operates from a single 1.7-V to 5.5-V supply, drawing

a typical supply current of 300 µA in normal operation.

The device can be placed in a low-power standby

mode where the typical operating current is 2.2 µA.

Package Information(1)

PART NUMBER(2)

PACKAGE

BODY SIZE (NOM)

INA234

DSBGA (8)

0.745 mm × 1.508 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

(2)

The INA234 is available in A and B device address options.

See Table 7-1 for address differences between the A and B

devices.

Current Register

I

2C-, SMBus-,

Compatible

Interface

Voltage Register

GND

ADC

V

I

A0

ALERT

SDA

SCL

C

0.1 µF

BYPASS

High-

Side

Shunt

Low-

Side

Shunt

Load

Alert Register

VS

Supply Voltage

(1.7 V to 5.5 V)

Bus Voltage

(-0.3 V to 28 V)

IN-

TI Device

IN+

Power Register

x

High-Side or Low-Side Sensing Application

INA234

SBOS844C – MAY 2021 – REVISED MARCH 2023

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.