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INA3221 Datasheet(PDF) 26 Page - Texas Instruments |
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INA3221 Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 46 page  26 INA3221 SBOS576B – MAY 2012 – REVISED MARCH 2016 www.ti.com Product Folder Links: INA3221 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated 8.6.2.1 Configuration Register (address = 00h) [reset = 7127h] The Configuration register settings control the operating modes for the shunt- and bus-voltage measurements for the three input channels. This register controls the conversion time settings for both the shunt- and bus-voltage measurements and the averaging mode used. The Configuration register is used to independently enable or disable each channel, as well as select the operating mode that controls which signals are selected to be measured. This register can be read from at any time without impacting or affecting either device settings or conversions in progress. Writing to this register halts any conversion in progress until the write sequence is completed, resulting in a new conversion starting, based on the new Configuration register contents. This architecture prevents any uncertainty in the conditions used for the next completed conversion. Figure 32. Configuration Register 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 RST CH1en CH2en CH3en AVG2 AVG1 AVG0 VBUS CT2 VBUS CT1 VBUS CT0 VSH CT2 VSH CT1 VSH CT0 MODE 3 MODE 2 MODE 1 RW-0 RW-1 RW-1 RW-1 RW-0 RW-0 RW-0 RW-1 RW-0 RW-0 RW-1 RW-0 RW-0 RW-1 RW-1 RW-1 LEGEND: R/W = Read/Write; R = Read only; -n = value after reset Table 5. Configuration Register Field Descriptions Bit Field Type Reset Description 15 RST R/W 0h Reset bit. Set this bit = 1 to generate a system reset that is the same as a power-on reset (POR). This bit resets all registers to default values and self-clears. 14 CH1en R/W 7h Channel enable mode. These bits allow each channel to be independently enabled or disabled. 0 = Channel disable 1 = Channel enable (default) 13 CH2en 12 CH3en 11-9 AVG2-0 R/W 0h Averaging mode. These bits set the number of samples that are collected and averaged together. 000 = 1 (default) 001 = 4 010 = 16 011 = 64 100 = 128 101 = 256 110 = 512 111 = 1024 8-6 VBUSCT2-0 R/W 4h Bus-voltage conversion time. These bits set the conversion time for the bus-voltage measurement. 000 = 140 μs 001 = 204 μs 010 = 332 μs 011 = 588 μs 100 = 1.1 ms (default) 101 = 2.116 ms 110 = 4.156 ms 111 = 8.244 ms 5-3 VSHCT2-0 R/W 4h Shunt-voltage conversion time. These bits set the conversion time for the shunt-voltage measurement. The conversion-time bit settings for VSHCT2-0 are the same as VBUSCT2-0 (bits 8-6) listed in the previous row. 2-0 MODE3-1 R/W 7h Operating mode. These bits select continuous, single-shot (triggered), or power-down mode of operation. These bits default to continuous shunt and bus mode. 000 = Power-down 001 = Shunt voltage, single-shot (triggered) 010 = Bus voltage, single-shot (triggered) 011 = Shunt and bus, single-shot (triggered) 100 = Power-down 101 = Shunt voltage, continuous 110 = Bus voltage, continuous 111 = Shunt and bus, continuous (default) |
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