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INA3221 Datasheet(PDF) 29 Page - Texas Instruments |
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INA3221 Datasheet(HTML) 29 Page - Texas Instruments |
29 / 46 page 29 INA3221 www.ti.com SBOS576B – MAY 2012 – REVISED MARCH 2016 Product Folder Links: INA3221 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated 8.6.2.6 Channel-3 Shunt-Voltage Register (address = 05h) [reset = 00h] This register contains the averaged shunt voltage measurement for channel 3. Full-scale range = 163.8 mV (decimal = 7FF8); LSB (SD0): 40 μV. Figure 37. Channel-3 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 10. Channel-3 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-3 shunt-voltage data bits 2-0 Reserved R 0h Reserved 8.6.2.7 Channel-3 Bus-Voltage Register (address = 06h) [reset = 00h] This register stores the bus voltage reading, VBUS, for channel 3. 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 38. Channel-3 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 11. Channel-3 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-3 bus-voltage data bits 2-0 Reserved R 0h Reserved |
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