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INA3221 Datasheet(PDF) 14 Page - Texas Instruments |
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INA3221 Datasheet(HTML) 14 Page - Texas Instruments |
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14 / 46 page  1.2 V Detected on Channel-1 Bus-Voltage Measurement Measure for 1.2 V on Channel-2 Bus Voltage 1.2 V on Channel 2 Detected 1.2 V on Channel 2 Not Detected Timing Control Output High Low 28.6 ms S Ch 1 S Ch 2 S Ch 3 S Ch 1 S Ch 2 S Ch 3 S Ch 1 S Ch 2 S Ch 3 S Ch 1 S Ch 2 S Ch 3 S Ch 1 S Ch 2 S Ch 3 Signal Channel 1.2 V Detected on Channel-1 Bus-Voltage Measurement Measure For 1.2 V on Channel-2 Bus Voltage 2.2 ms 28.6 ms B B B B B B B B B B B B B B B Power-Valid Detection INA3321 VS PV VPU RPU RPU_ext RDIV (1) 14 INA3221 SBOS576B – MAY 2012 – REVISED MARCH 2016 www.ti.com Product Folder Links: INA3221 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated Feature Description (continued) The PV pin allows for a 0-V 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 20. It is also possible to divide down the high power-valid pull-up voltage by adding a resistor to ground at the PV output, thus allowing this function to interface with lower-voltage circuitry, if needed. (1) RDIV can be used to level-shift the PV output high. Figure 20. Power-Valid Output Structure 8.3.2.4 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 1.2-V level is reached. This comparison is made each time the sequence returns to the channel-1 bus-voltage measurement. When a 1.2-V level is detected on the channel-1 bus-voltage measurement, the INA3221 begins checking for a 1.2-V level present on the channel-2 bus-voltage measurement. After a 1.2-V level is detected on channel 1, if the INA3221 does not detect a 1.2-V 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 21, this sequence allows for approximately 28.6 ms from the time 1.2 V is detected on channel 1 for a valid voltage to be detected on channel 2. Figure 22 illustrates the state diagram for the TC alert pin. NOTE: The signal refers to the corresponding shunt (S) and bus (B) voltage measurement for each channel. Figure 21. Timing Control Timing Diagram Figure 22. Timing Control State Diagram |
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