INA3221 datasheet(26/50 Pages) TI2

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7.6.2.1 Configuration Register (address = 00h) [reset = 7127h]

The Configuration register settings control the operating modes for the shunt- and bus-voltage measurements for

the three input channels. This register controls the conversion time settings for both the shunt- and bus-voltage

measurements and the averaging mode used. The Configuration register is used to independently enable or

disable each channel, as well as select the operating mode that controls which signals are selected to be

measured.

This register can be read from at any time without impacting or affecting either device settings or conversions in

progress. Writing to this register halts any conversion in progress until the write sequence is completed, resulting

in a new conversion starting, based on the new Configuration register contents. This architecture prevents any

uncertainty in the conditions used for the next completed conversion.

Table 7-5. Configuration Register

RST

CH1en

CH2en

CH3en

AVG2

AVG1

AVG0

VBUS

CT2

VBUS

CT1

VBUS

CT0

VSH

CT2

VSH

CT1

VSH

CT0

MODE

RW-0

RW-1

RW-0

RW-1

RW-0

RW-1

RW-0

RW-1

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

Table 7-6. Configuration Register Field Descriptions

Bit

Field

Type

Reset

Description

RST

R/W

Reset bit. Set this bit = 1 to generate a system reset that is the

same as a power-on reset (POR). This bit resets all registers to

default values and self-clears.

CH1en

R/W

Channel enable mode. These bits allow each channel to be

independently enabled or disabled.

0 = Channel disable

1 = Channel enable (default)

CH2en

CH3en

11-9

AVG2-0

R/W

Averaging mode. These bits set the number of samples that are

collected and averaged together.

000 = 1 (default)

001 = 4

010 = 16

011 = 64

100 = 128

101 = 256

110 = 512

111 = 1024

8-6

VBUSCT2-0

R/W

Bus-voltage conversion time. These bits set the conversion time

for the bus-voltage measurement.

000 = 140μs

001 = 204μs

010 = 332μs

011 = 588μs

100 = 1.1ms (default)

101 = 2.116ms

110 = 4.156ms

111 = 8.244ms

5-3

VSHCT2-0

R/W

Shunt-voltage conversion time. These bits set the conversion

time for the shunt-voltage measurement.

The conversion-time bit settings for VSHCT2-0 are the same as

VBUSCT2-0 (bits 8-6) listed in the previous row.

INA3221

SBOS576C – MAY 2012 – REVISED SEPTEMBER 2025

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