TPS650932 Datasheet, PDF (47/121 Pages) Texas Instruments – Simple and Flexible Wide Input Voltage PMIC for Computing

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TPS650932
SLVSE36 – AUGUST 2017
• The junction temperature equals the critical temperature which casus a die thermal fault. In this case,
read the RESETIRQ2 register to determine if thermal fault caused shutdown.
• The hardware forces shutdown. In this case, the SHUTDOWNZ pin is forced low.
• The software forces shutdown. In this case, read the SDWNCTRL register (address 0x49).
• The PWRBTN bit is held longer than the time defined by the FLT[5:0] bit. In this case, read the
RESETIRQ1 register to determine if the push button caused shutdown.
The PMIC monitors each rail and ensures no faults are present. All rails are monitored for fault protection.
Notice also that the current limit does not directly cause a shutdown. Instead, an overcurrent condition
could cause a shutdown indirectly by means of a power fault. The overcurrent condition limits the
maximum possible output current, such that if the load current exceeds the current limit, then the voltage
drops until the lower output voltage causes a power fault if it is below the power-good threshold for more
than the PG_deglitch time (30 µs). An emergency power shutdown causes all rails to immediately power
down. The LDO3, LDO5, and VREF1.25V remain on if the input voltage is greater than the UVLO3 and
UVLO5 thresholds.
6.4.6 Backup Battery, G3 (No VIN)
G3 is an Intel defined state where the VIN voltage is greater than the UVLO threshold to the device and a
valid backup battery is present on the VBATTBKUP pin. In this state, the backup battery is passed to the
RTC output and the RTC-domain I²C register values are saved. When the VIN voltage is greater than the
UVLO threshold these register retain their value and can be read when I²C is ready.
In this state, all VRs and internal LDOs are off and I²C access is not available.
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