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DATA OUTPUT REGISTERS

Shunt Voltage Register 01h (Read-Only)

INA220

www.ti.com ............................................................................................................................................................. SBOS459B – JUNE 2009 – REVISED JUNE 2009

The Shunt Voltage Register stores the current shunt voltage reading, VSHUNT. Shunt Voltage Register bits are

shifted according to the PGA setting selected in the Configuration Register (00h). When multiple sign bits are

present, they will all be the same value. Negative numbers are represented in twos complement format.

Generate the twos complement of a negative number by complementing the absolute value binary number and

adding 1. Extend the sign, denoting a negative number by setting the MSB = '1'. Extend the sign to any

additional sign bits to form the 16-bit word.

Example: For a value of VSHUNT = –320mV:

1. Take the absolute value (include accuracy to 0.01mV)==> 320.00

2. Translate this number to a whole decimal number ==> 32000

3. Convert it to binary==> 111 1101 0000 0000

4. Complement the binary result : 000 0010 1111 1111

5. Add 1 to the complement to create the twos complement formatted result ==> 000 0011 0000 0000

6. Extend the sign and create the 16-bit word: 1000 0011 0000 0000 = 8300h (Remember to extend the sign to

all sign-bits, as necessary based on the PGA setting.)

At PGA = ÷8, full-scale range = ±320mV (decimal = 32000, positive value hex = 7D00, negative value hex =

8300), and LSB = 10

µV.

BIT #

D15

D14

D13

D12

D11

D10

BIT

SIGN

SD14_8

SD13_8

SD12_8

SD11_8

SD10_8

SD9_8

SD8_8

SD7_8

SD6_8

SD5_8

SD4_8

SD3_8

SD2_8

SD1_8

SD0_8

NAME

POR

VALUE

At PGA = ÷4, full-scale range = ±160mV (decimal = 16000, positive value hex = 3E80, negative value hex =

C180), and LSB = 10

µV.

BIT #

D15

D14

D13

D12

D11

D10

BIT

SIGN

SD13_4

SD12_4

SD11_4

SD10_4

SD9_4

SD8_4

SD7_4

SD6_4

SD5_4

SD4_4

SD3_4

SD2_4

SD1_4

SD0_4

NAME

POR

VALUE

At PGA = ÷2, full-scale range = ±80mV (decimal = 8000, positive value hex = 1F40, negative value hex = E0C0),

and LSB = 10

µV.

BIT #

D15

D14

D13

D12

D11

D10

BIT

SIGN

SD12_2

SD11_2

SD10_2

SD9_2

SD8_2

SD7_2

SD6_2

SD5_2

SD4_2

SD3_2

SD2_2

SD1_2

SD0_2

NAME

POR

VALUE

At PGA = ÷1, full-scale range = ±40mV (decimal = 4000, positive value hex = 0FA0, negative value hex = F060),

and LSB = 10

µV.

BIT #

D15

D14

D13

D12

D11

D10

BIT

SIGN

SD11_1

SD10_1

SD9_1

SD8_1

SD7_1

SD6_1

SD5_1

SD4_1

SD3_1

SD2_1

SD1_1

SD0_1

NAME

POR

VALUE

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