Datasheet

INA3221
SBOS576A –MAY 2012–REVISED JUNE 2013 www.ti.com
Bits[5:3] V
SH
CT: Shunt voltage conversion time
Sets the conversion time for the shunt voltage measurement.
Table 5 shows the V
SH
CT bit options and related conversion times for each bit.
Table 5. V
SH
CT Bit Settings, Bits[5:3]
V
SH
CT2 V
SH
CT1 V
SH
CT0
CONVERSION TIME
D5 D4 D3
0 0 0 140 µs
0 0 1 204 µs
0 1 0 332 µs
0 1 1 588 µs
1 (default) 0 (default) 0 (default) 1.1 ms (default)
1 0 1 2.116 ms
1 1 0 4.156 ms
1 1 1 8.244 ms
Bits[2:0] MODE: Operating mode
Selects continuous, triggered, or power-down mode of operation. These bits default to continuous shunt and bus
measurement mode.
The mode settings are shown in Table 6.
Table 6. Mode Settings, Bits[2:0]
MODE3 MODE2 MODE1
MODE
D2 D1 D0
0 0 0 Power-down
0 0 1 Shunt voltage, triggered
0 1 0 Bus voltage, triggered
0 1 1 Shunt and bus, triggered
1 0 0 Power-down
Shunt voltage,
1 0 1
continuous
1 1 0 Bus voltage, continuous
Shunt and bus,
1 (default) 1 (default) 1 (default)
continuous (default)
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 can be 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.
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