2 Overview
The INA228, INA229, INA237, INA238, and INA239 devices are digital power monitors with integrated 20-bit
(INA229 and INA228) and 16-bit (INA237, INA238, and INA239) delta-sigma ADCs specifically designed for
current-sensing applications. The devices can measure a selectable full-scale differential input of ±163.84 mV
or ±40.96 mV across the shunt with common-mode voltage support from –0.3 V to +85 V. For the INA228 and
INA229, built-in digital accumulation calculates average power, internal die temperature, energy, and charge
accumulation. For the INA237, INA238, and INA239, built-in digital accumulation calculates average power and
internal die temperature. All devices also have built-in diagnostics to indicate system health accessible through
a digital output pin, ALERT. The devices operate from a single supply of 2.7 V to 5.5 V, drawing < 1.1-mA
current during operation and < 5-µA current during shutdown. The output can be interfaced with a multitude
of microcontrollers (MCUs) with a standard 4-wire SPI interface (INA229 and INA239) or with a standard I2C
interface (INA228, INA237, and INA238).
Table 2-1. Device Summary
PRODUCT
DIGITAL
PROTOCOL
ADC
RESOLUTION
MAX GAIN
ERROR
MAX OFFSET
VOLTAGE
INA228 I2C 20-bit 0.05% ±1 µV
INA229 SPI 20-bit 0.05% ±1 µV
INA237 I2C 16-bit 0.3% ±50 µV
INA238 I2C 16-bit 0.1% ±5 µV
INA239 SPI 16-bit 0.1% ±5 µV
2.1 Kit Contents
Table 2-2 lists the contents of the EVM kit. Contact the nearest Texas Instruments Product Information Center if
any component is missing.
Table 2-2. Kit Contents
ITEM QUANTITY
INA228EVM, INA229EVM, INA237EVM,
INA238EVM, OR INA239EVM test board
1
Sensor Control Board (SCB) 1
USB cable 1
www.ti.com Overview
SBOU241C – APRIL 2020 – REVISED JULY 2021
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INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide 5
Copyright © 2021 Texas Instruments Incorporated
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