7.6.1.3 Bus Voltage Register (Address = 2h) [reset = 0000h]

The bus voltage register is shown in Table 7-6.

This register will only return positive values. If averaging is enabled, this register displays the averaged value.

Table 7-6. Bus Voltage Register Field Descriptions

Bit

Field

Type

Reset

Description

15

Reserved

R

0b

This bit returns Zero as common mode voltage is only positive

14-0

VBUS

R

0000h

These bits readout the bus voltage of the system

Return to the Summary Table.

7.6.1.4 POWER Register (Address = 3h) [reset = 0000h]

The power register is shown in Table 7-7.

If averaging is enabled, this register displays the averaged value. The Power Register records power in Watts by

multiplying the decimal values of the Current Register with the decimal value of the Bus Voltage Register. This is

an unsigned result.

Table 7-7. POWER Register Field Descriptions

Bit

Field

Type

Reset

Description

15-0

POWER

R

0000h

This bit returns a calculated value of power in the system.

This is an unsigned result.

Return to the Summary Table.

7.6.1.5 CURRENT Register (Address = 4h) [reset = 0000h]

CURRENT is shown in Table 7-8.

If averaging is enabled, this register displays the averaged 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.

Table 7-8. CURRENT Register Field Descriptions

Bit

Field

Type

Reset

Description

15-0

CURRENT

R

0000h

Calculated current output in Amperes. Two's complement value.

Return to the Summary Table.

7.6.1.6 Calibration Register (Address = 5h) [reset = 0000h]

The calibration register shown in Table 7-9 must be programmed to receive valid current and power results after

initial power up or power cycle events.

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

differential voltage. It also sets the resolution of the Current Register. Programming this register sets the

Current_LSB and the Power_LSB.

Table 7-9. Calibration Register Field Descriptions

Bit

Field

Type

Reset

Description

15

Reserved

R

0h

14-0

SHUNT_CAL

R/W

0000h

Programmed value needed for doing the shunt voltage to current

conversion.

Return to the Summary Table.

INA232

SBOSAA2 – DECEMBER 2022

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