Power=

Current

BusVoltage

´

5000

INA220

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SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010

Bus Voltage Register 02h (Read-Only)

At full-scale range = 32V (decimal = 8000, hex = 1F40), and LSB = 4mV.

BIT #

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

BIT

BD12

BD11

BD10

BD9

BD8

BD7

BD6

BD5

BD4

BD3

BD2

BD1

BD0

—

CNVR

OVF

NAME

POR

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

VALUE

At full-scale range = 16V (decimal = 4000, hex = 0FA0), and LSB = 4mV.

BIT #

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

BIT

0

BD11

BD10

BD9

BD8

BD7

BD6

BD5

BD4

BD3

BD2

BD1

BD0

—

CNVR

OVF

NAME

POR

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

VALUE

CNVR:

Conversion Ready

Bit 1

Although the data from the last conversion can be read at any time, the INA220 Conversion Ready bit (CNVR)

indicates when data from a conversion is available in the data output registers. The CNVR bit is set after all

conversions, averaging, and multiplications are complete. CNVR will clear under the following conditions:

1.) Writing a new mode into the Operating Mode bits in the Configuration Register (except for Power-Down or

Disable)

2.) Reading the Power Register

OVF:

Math Overflow Flag

Bit 0

The Math Overflow Flag (OVF) is set when the Power or Current calculations are out of range. It indicates that

current and power data may be meaningless.

Power Register 03h (Read-Only)

Full-scale range and LSB are set by the Calibration Register. See the Programming the INA220 Power

Measurement Engine section.

BIT #

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

BIT

PD15

PD14

PD13

PD12

PD11

PD10

PD9

PD8

PD7

PD6

PD5

PD4

PD3

PD2

PD1

PD0

NAME

POR

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

VALUE

The Power Register records power in watts by multiplying the values of the current with the value of the bus

voltage according to the equation:

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