Overview
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4SBOU241A–April 2020–Revised June 2020
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Copyright © 2020, Texas Instruments Incorporated
INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide
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 full-scale differential input of
±163.84 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-mA current during operation and with < 10-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 1. INA228, INA229, INA237, INA238, and INA239 Device Summary
PRODUCT DIGITAL
PROTOCOL ADC
RESOLUTION MAX GAIN
ERROR MAX OFFSET
VOLTAGE
INA228 I2C 20-bit 0.1% ±2 µV
INA229 SPI 20-bit 0.1% ±2 µV
INA237 I2C 16-bit 0.25% ±50 µV
INA238 I2C 16-bit 0.25% ±10 µV
INA239 SPI 16-bit 0.25% ±10 µV
2.1 Kit Contents
Table 2 lists the contents of the EVM kit. Contact the nearest Texas Instruments Product Information
Center if any component is missing.
Table 2. Kit Contents
Item Quantity
INA228EVM, INA229EVM, INA237EVM,
INA238EVM, OR INA239EVM test board 1
USB cable 1
2.2 Related Documentation From Texas Instruments
This user's guide is available from the TI website under literature number SBOU241. Any letter appended
to the literature number corresponds to the document revision that is current at the time of the writing of
this document. Newer revisions are available from www.ti.com or the Texas Instruments' Literature
Response Center at (800) 477-8924 or the Product Information Center at (972) 644-5580. When ordering,
identify the document by both title and literature number. Table 3 lists documentation related to the EVM.
Click the links in Table 3 for further information. The device name links to the product web folder on
www.ti.com. The literature number links to the document PDF.
Table 3. Related Documentation
Document Title Document Literature
Number
INA228-Q1 data sheet SLYS022
INA229-Q1 data sheet SLYS024
INA237-Q1 data sheet SBOSA27
INA238-Q1 data sheet SLYS026
INA239-Q1 data sheet SLYS028
