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INA231

SBOS644B – FEBRUARY 2013 – REVISED AUGUST 2017

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(1)

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

(2)

The Current register defaults to '0' because the Calibration register defaults to '0', yielding a zero current and power value until the

Calibration register is programmed.

8.6 Register Maps

The INA231 uses a bank of registers for holding configuration settings, measurement results, minimum/maximum

limits, and status information. Table 3 summarizes the INA231 registers; refer to Figure 20 for an illustration of

the registers.

Table 3. Summary of Register Set

POINTER

ADDRESS

REGISTER NAME

FUNCTION

POWER-ON RESET

HEX

BINARY

HEX

00

Configuration

This register resets all registers and

controls shunt voltage and bus voltage,

ADC conversion times and averaging,

as well as the device operating mode.

01000001 00100111

4127

R/W

01

Shunt Voltage

Shunt voltage measurement data

00000000 00000000

0000

R

02

Bus Voltage

Bus voltage measurement data

00000000 00000000

0000

R

03

This register contains the value of the

calculated power being delivered to the

load.

00000000 00000000

0000

R

04

This register contains the value of the

calculated current flowing through the

shunt resistor.

00000000 00000000

0000

R

05

Calibration

This register sets the full-scale range

and LSB of the current and power

measurements. This register sets the

overall system calibration.

00000000 00000000

0000

R/W

06

Mask/Enable

This register sets the alert configuration

and conversion ready flag.

00000000 00000000

0000

R/W

07

Alert Limit

This register contains the limit value to

compare to the selected alert function.

00000000 00000000

0000

R/W