INA231

SBOS644 – FEBRUARY 2013

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Current Register (04h, Read-Only)

If averaging is enabled, this register displays the averaged value.

BIT #

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

BIT

CSIGN

CD14

CD13

CD12

CD11

CD10

CD9

CD8

CD7

CD6

CD5

CD4

CD3

CD2

CD1

CD0

NAME

POR

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

VALUE

The value of the Current register is calculated by multiplying the decimal value in the Shunt Voltage register with

the decimal value of the Calibration register, according to Equation 3.

Calibration Register (05h, Read/Write)

This register provides the INA231 with the shunt resistor value that was present to create the measured

differential voltage. This register also sets the resolution of the Current register. The Current register LSB and

Power register LSB are set through the programming of this register. This register is also used for overall system

calibration. See the Configure/Measure/Calculate Example for more information on programming this register.

BIT #

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

BIT

—

FS14

FS13

FS12

FS11

FS10

FS9

FS8

FS7

FS6

FS5

FS4

FS3

FS2

FS1

FS0

NAME

POR

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

VALUE

Mask/Enable Register (06h, Read/Write)

The Mask/Enable register selects the function that controls the ALERT pin, as well as how that pin functions. If

multiple functions are enabled, the highest significant bit position alert function (D15:D11) takes priority and

responds to the Alert Limit register.

BIT #

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

BIT

SOL

SUL

BOL

BUL

POL

CNVR

—

—

—

—

—

AFF

CVRF

OVF

APOL

LEN

NAME

POR

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

VALUE

SOL:

Shunt Voltage Over-Voltage

Bit 15

Setting this bit high configures the ALERT pin to be asserted when the shunt voltage conversion exceeds the value

in the Alert Limit register.

SUL:

Shunt Voltage Under-Voltage

Bit 14

Setting this bit high configures the ALERT pin to be asserted when the shunt voltage conversion drops below the

value in the Alert Limit register.

BOL:

Bus Voltage Over-Voltage

Bit 13

Setting this bit high configures the ALERT pin to be asserted when the bus voltage conversion exceeds the value in

the Alert Limit register.

BUL:

Bus Voltage Under-Voltage

Bit 12

Setting this bit high configures the ALERT pin to be asserted when the bus voltage conversion drops below the

value in the Alert Limit register.

POL:

Over-Limit Power

Bit 11

Setting this bit high configures the ALERT pin to be asserted when the power calculation exceeds the value in the

Alert Limit register.

22

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