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INA3221AIRGVR Datasheet(PDF) 23 Page - Texas Instruments

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Part # INA3221AIRGVR
Description  Triple-Channel, High-Side Measurement, Shunt and Bus Voltage Monitor
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

INA3221AIRGVR Datasheet(HTML) 23 Page - Texas Instruments

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INA3221
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SBOS576 – MAY 2012
Channel 1 Shunt Voltage Register (Address = 01h, Read-Only)
Full-scale range = 163.8 mV (decimal = 7FF8); LSB (SD0): 40
μV. This register contains the averaged shunt
voltage measurement for channel 1.
BIT
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
NAME
SIGN
SD11
SD10
SD9
SD8
SD7
SD6
SD5
SD4
SD3
SD2
SD1
SD0
POR
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
VALUE
This register stores the current shunt voltage reading, VSHUNT, for channel 1. 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 MSB = 1.
Example: For a value of VSHUNT = –80 mV:
1. Take the absolute value: 80 mV
2. Translate this number to a whole decimal number (80 mV / 40 µV) = 2000
3. Convert this number to binary = 011 1110 1000 0--- (non-used bits are '0')
4. Complement the binary result = 100 0001 0111 1111
5. Add '1' to the complement to create the twos complement result = 100 0001 1000 0000
6. Extend the sign and create the 16-bit word: 1100 0001 1000 0000 = C180h
Channel 1 Bus Voltage Register (Address = 02h, Read-Only)(1)
Full-scale range = 32.76 V(1) (decimal = 7FF8); LSB (BD0) = 8 mV.
BIT
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
NAME
SIGN
BD11
BD10
BD9
BD8
BD7
BD6
BD5
BD4
BD3
BD2
BD1
BD0
POR
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
VALUE
(1)
While 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.
This register stores the bus voltage reading, VBUS, for channel 1.
Copyright © 2012, Texas Instruments Incorporated
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