INA3221 datasheet(24/50 Pages) TI2

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7.6 Register Maps

The INA3221 uses a bank of registers for holding configuration settings, measurement results, minimum and

maximum limits, and status information. Table 7-3 summarizes the INA3221 registers; see the Functional Block

Diagram section for an illustration of the registers.

7.6.1 Summary of Register Set

Table 7-3. Summary of Register Set

POINTER

ADDRESS

(Hex)

DESCRIPTION

POWER-ON RESET

TYPE(1)

BINARY

HEX

Configuration

All-register reset, shunt and bus voltage ADC conversion times and

averaging, operating mode.

01110001 00100111

7127

R/ W

Channel-1 Shunt Voltage

Averaged shunt voltage value.

00000000 00000000

0000

Channel-1 Bus Voltage

Averaged bus voltage value.

00000000 00000000

0000

Channel-2 Shunt Voltage

Averaged shunt voltage value.

00000000 00000000

0000

Channel-2 Bus Voltage

Averaged bus voltage value.

00000000 00000000

0000

Channel-3 Shunt Voltage

Averaged shunt voltage value.

00000000 00000000

0000

Channel-3 Bus Voltage

Averaged bus voltage value.

00000000 00000000

0000

Channel-1 Critical Alert

Limit

Contains limit value to compare each conversion value to determine

if the corresponding limit has been exceeded.

01111111 11111000

7FF8

R/ W

Channel-1 Warning Alert

Limit

Contains limit value to compare to averaged measurement to

determine if the corresponding limit has been exceeded.

01111111 11111000

7FF8

R/ W

Channel-2 Critical Alert

Limit

Contains limit value to compare each conversion value to determine

if the corresponding limit has been exceeded.

01111111 11111000

7FF8

R/ W

Channel-2 Warning Alert

Limit

Contains limit value to compare to averaged measurement to

determine if the corresponding limit has been exceeded.

01111111 11111000

7FF8

R/ W

Channel-3 Critical Alert

Limit

Contains limit value to compare each conversion value to determine

if the corresponding limit has been exceeded.

01111111 11111000

7FF8

R/ W

Channel-3 Warning Alert

Limit

Contains limit value to compare to averaged measurement to

determine if the corresponding limit has been exceeded.

01111111 11111000

7FF8

R/ W

Shunt-Voltage Sum

Contains the summed value of the each of the selected shunt

voltage conversions.

00000000 00000000

0000

Shunt-Voltage Sum Limit

Contains limit value to compare to the Shunt Voltage Sum register to

determine if the corresponding limit has been exceeded.

01111111 11111110

7FFE

R/ W

Mask/Enable

Alert configuration, alert status indication, summation control and

status.

00000000 00000010

0002

R/ W

Power-Valid Upper Limit

Contains limit value to compare all bus voltage conversions to

determine if the Power Valid level has been reached.

00100111 00010000

2710

R/ W

Power-Valid Lower Limit

Contains limit value to compare all bus voltage conversions to

determine if the any voltage rail has dropped below the Power Valid

range.

00100011 00101000

2328

R/ W

Manufacturer ID

Contains unique manufacturer identification number.

01010100 01001001

5449

Die ID

Contains unique die identification number.

00110010 00100000

3220

(1)

Type: R = read-only, R/ W = read/write.

INA3221

SBOS576C – MAY 2012 – REVISED SEPTEMBER 2025

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