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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
lists the contents of the EVM kit. Contact the nearest
Texas Instruments Product Information Center
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
Overview
SBOU241C – APRIL 2020 – REVISED JULY 2021
INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide
5
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