INA3221 datasheet(15/46 Pages) TI1

Part #	INA3221

Description	Triple-Channel, High-Side Measurement, Shunt and Bus Voltage Monitor with I2C- and SMBUS-Compatible Interface

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Manufacturer	TI1 [Texas Instruments]

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INA3221

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SBOS576B – MAY 2012 – REVISED MARCH 2016

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Feature Description (continued)

The timing control alert function is only monitored at power-up or when a software reset is issued by setting the

reset bit (RST, bit 15) in the Configuration register. The timing control alert function timing is based on the default

device settings at power-up. Writing to the Configuration register before the timing control alert function

completes the full sequence results in disabling the timing control alert until power is cycled or a software reset is

issued.

8.3.2.5 Default Settings

The default register power-up states are listed in the Register Maps section. These registers are volatile; if

programmed to a value other than the default values shown in Table 3, the registers must be reprogrammed

every time the device powers up.

8.3.3 Software Reset

The INA3321 features a software reset that reinitializes the device and register settings to default power-up

values without having to cycle power to the device. Use bit 15 (RST) of the Configuration register to perform a

software reset. Setting RST reinitializes all registers and settings to the default power state with the exception of

the power-valid output state.

If a software reset is issued, the INA3221 holds the output of the PV pin until the power-valid detection sequence

completes. The Power-Valid Upper Limit and Power-Valid Lower limit registers return to the default state when

the software reset has been issued. Therefore, any reprogrammed limit registers are reset, resulting in the

original power-valid thresholds validating the power-valid conditions. This architecture prevents interruption to

circuitry connected to the power valid output during a software reset event.

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