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INA3221-Q1 Datasheet(PDF) 26 Page - Texas Instruments |
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INA3221-Q1 Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 45 page  26 INA3221-Q1 SBOS776B – MARCH 2016 – REVISED MARCH 2016 www.ti.com Product Folder Links: INA3221-Q1 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated 8.6.2.2 Channel-1 Shunt-Voltage Register (address = 01h), [reset = 00h] This register contains the averaged shunt-voltage measurement for channel 1. This register stores the 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. Full-scale range = 163.8 mV (decimal = 7FF8); LSB (SD0): 40 μV. 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_ _ _ (last three bits are set to 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 Figure 33. Channel-1 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 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 LEGEND: R/W = Read/Write; R = Read only; -n = value after reset Table 6. Channel-1 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-1 shunt-voltage data bits 2-0 Reserved R 0h Reserved 8.6.2.3 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 not apply more than 26 V. Figure 34. Channel-1 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 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 LEGEND: R/W = Read/Write; R = Read only; -n = value after reset Table 7. Channel-1 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-1 bus-voltage data bits 2-0 Reserved R 0h Reserved |
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