INA3221

SBOS576 – MAY 2012

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Bits[5:3]

Sets the conversion time for the shunt voltage measurement.

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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