INA209 datasheet(14/50 Pages) TI2

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The PV pin allows for a 0V output that indicates a power-invalid condition. An output equal to the pull-up supply

voltage connected to the VPU pin indicates a power-valid condition, as shown in Figure 7-2. Dividing down the

high power-valid pull-up voltage by adding a resistor to ground at the PV output is also possible, thus allowing

this function to interface with lower-voltage circuitry, if needed.

Power-Valid

Detection

INA3221

VPU

RPU

RPU_ext

RDIV

(1)

RDIV can be used to level-shift the PV output high.

Figure 7-2. Power-Valid Output Structure

7.3.2.4 Timing-Control Alert

The INA3221 timing-control alert function helps verify proper power-supply sequencing. At power-up, the default

INA3221 setting is continuous shunt- and bus-voltage conversion mode, and the INA3221 internally begins

comparing the channel-1 bus voltage to determine when a 1.2V level is reached. This comparison is made each

time the sequence returns to the channel-1 bus-voltage measurement. When a 1.2V level is detected on the

channel-1 bus-voltage measurement, the INA3221 begins checking for a 1.2V level present on the channel-2

bus-voltage measurement. After a 1.2V level is detected on channel 1, if the INA3221 does not detect a 1.2V

value or greater on the bus voltage measurement following four complete cycles of all three channels, the timing

control (TC) alert pin pulls low to indicate that the INA3221 has not detected a valid power rail on channel 2. As

shown in Figure 7-3, this sequence allows for approximately 28.6ms from the time 1.2V is detected on channel 1

for a valid voltage to be detected on channel 2. Figure 7-4 illustrates the state diagram for the TC alert pin.

Signal

Channel

1.2V Detected on Channel-1

Bus-Voltage Measurement

Measure For 1.2V on

Channel-2 Bus Voltage

2.2ms

28.6ms

NOTE: The signal refers to the corresponding shunt (S) and bus (B) voltage measurement for each channel.

Figure 7-3. Timing Control Timing Diagram

1.2V Detected on Channel-1

Bus-Voltage Measurement

Measure for 1.2V

on Channel-2 Bus Voltage

1.2V on Channel 2 Detected

1.2V on Channel 2 Not Detected

Timing

Control

Output

High

Low

28.6ms

Figure 7-4. Timing Control State Diagram

INA3221

SBOS576C – MAY 2012 – REVISED SEPTEMBER 2025

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