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## INA3221 Datasheet(PDF) 27 Page - Texas Instruments

 Part # INA3221 Description Triple-Channel, High-Side Measurement, Shunt and Bus Voltage Monitor with I2C- and SMBUS-Compatible Interface Download 46 Pages Scroll/Zoom 100% Manufacturer TI1 [Texas Instruments] Direct Link http://www.ti.com Logo

## INA3221 Datasheet(HTML) 27 Page - Texas Instruments

 27 / 46 page27INA3221www.ti.comSBOS576B – MAY 2012 – REVISED MARCH 2016Product Folder Links: INA3221Submit Documentation FeedbackCopyright © 2012–2016, Texas Instruments Incorporated8.6.2.2 Channel-1 Shunt-Voltage Register (address = 01h), [reset = 00h]This register contains the averaged shunt-voltage measurement for channel 1. This register stores the currentshunt-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 andadding 1. Extend the sign, denoting a negative number by setting MSB = 1.Full-scale range = 163.8 mV (decimal = 7FF8); LSB (SD0): 40μV.Example: For a value of VSHUNT = –80 mV:1. Take the absolute value: 80 mV2. Translate this number to a whole decimal number (80 mV / 40 µV) = 20003. Convert this number to binary = 011 1110 1000 0_ _ _ (last three bits are set to 0)4. Complement the binary result = 100 0001 0111 11115. Add 1 to the complement to create the twos complement result = 100 0001 1000 00006. Extend the sign and create the 16-bit word: 1100 0001 1000 0000 = C180hFigure 33. Channel-1 Shunt-Voltage Register1514131211109876543210SIGNSD11SD10SD9SD8SD7SD6SD5SD4SD3SD2SD1SD0———R-0R-0R-0R-0R-0R-0R-0R-0R-0R-0R-0R-0R-0R-0R-0R-0LEGEND: R/W = Read/Write; R = Read only; -n = value after resetTable 6. Channel-1 Shunt-Voltage Register Field DescriptionsBitFieldTypeResetDescription15SIGNR0hSign bit.0 = positive number1 = negative number in twos complement format14-3SD11-0R0hChannel-1 shunt-voltage data bits2-0ReservedR0hReserved8.6.2.3 Channel-1 Bus-Voltage Register (address = 02h) [reset = 00h]This register stores the bus voltage reading, VBUS, for channel 1. 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 notapply more than 26 V.Figure 34. Channel-1 Bus-Voltage Register1514131211109876543210SIGNBD11BD10BD9BD8BD7BD6BD5BD4BD3BD2BD1BD0———R-0R-0R-0R-0R-0R-0R-0R-0R-0R-0R-0R-0R-0R-0R-0R-0LEGEND: R/W = Read/Write; R = Read only; -n = value after resetTable 7. Channel-1 Bus-Voltage Register Field DescriptionsBitFieldTypeResetDescription15SIGNR0hSign bit.0 = positive number1 = negative number in twos complement format.14-3BD11-0R0hChannel-1 bus-voltage data bits2-0ReservedR0hReserved

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