INA3221-Q1 datasheet(27/45 Pages) TI1

Part #	INA3221-Q1

Description	Current and Voltage Monitor with Programmable Overcurrent Alerts

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Manufacturer	TI1 [Texas Instruments]

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INA3221-Q1

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SBOS776B – MARCH 2016 – REVISED MARCH 2016

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8.6.2.4 Channel-2 Shunt-Voltage Register (address = 03h) [reset = 00h]

This register contains the averaged shunt voltage measurement for channel 2. Full-scale range = 163.8 mV

(decimal = 7FF8); LSB (SD0): 40

μV. Although the input range is 26 V, the full-scale range of the ADC scaling is

32.76 V. Do not apply more than 26 V.

Figure 35. Channel-2 Shunt-Voltage Register

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

SIGN

SD11

SD10

SD9

SD8

SD7

SD6

SD5

SD4

SD3

SD2

SD1

SD0

—

R-0

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

Table 8. Channel-2 Shunt-Voltage Register Field Descriptions

Bit

Field

Type

Reset

Description

15

SIGN

R

0h

Sign bit.

0 = positive number

1 = negative number in twos complement format

14-3

SD11-0

R

0h

Channel-2 shunt-voltage data bits

2-0

Reserved

R

0h

Reserved

8.6.2.5 Channel-2 Bus-Voltage Register (address = 04h) [reset = 00h]

This register stores the bus voltage reading, VBUS, for channel 2. Full-scale range = 32.76 V (decimal = 7FF8);

LSB (BD0) = 8 mV. Although the input range is 26 V, the full-scale range of the ADC scaling is 32.76 V. Do not

apply more than 26 V.

Figure 36. Channel-2 Bus-Voltage Register

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

SIGN

BD11

BD10

BD9

BD8

BD7

BD6

BD5

BD4

BD3

BD2

BD1

BD0

—

R-0

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

Table 9. Channel-2 Bus-Voltage Register Field Descriptions

Bit

Field

Type

Reset

Description

15

SIGN

R

0h

Sign bit.

0 = positive number

1 = negative number in twos complement format

14-3

BD11-0

R

0h

Channel-2 bus-voltage data bits

2-0

Reserved

R

0h

Reserved

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