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STM690/704/795/802/804/805/806
Power-fail Input/Output (NOT available on STM795)
The Power-fail Input (PFI) is compared to an inter-
nal reference voltage (independent from the VRST
comparator). If PFI is less than the power-fail
threshold (VPFI), the Power-Fail Output (PFO) will
go low. This function is intended for use as an un-
dervoltage detector to signal a failing power sup-
ply. Typically PFI is connected through an external
voltage divider (see Figure 11., page 8) to either
the unregulated DC input (if it is available) or the
regulated output of the VCC regulator. The voltage
divider can be set up such that the voltage at PFI
falls below VPFI several milliseconds before the
regulated VCC input to the STM690/704/795/802/
804/805/806 or the microprocessor drops below
the minimum operating voltage.
During battery back-up, the power-fail comparator
is turned off and PFO goes (or remains) low (see
Figure 14., page 11). This occurs after VCC drops
below VSW (2.4V). When power returns, the pow-
er-fail comparator is enabled and PFO follows PFI.
If the comparator is unused, PFI should be con-
nected to VSS and PFO left unconnected. PFO
may be connected to MR on the STM704/806 so
that a low voltage on PFI will generate a reset out-
put.
Applications Information
These Supervisor circuits are not short-circuit pro-
tected. Shorting VOUT to ground - excluding pow-
er-up transients such as charging a decoupling
capacitor - destroys the device. Decouple both
VCC and VBAT pins to ground by placing 0.1µF ca-
pacitors as close to the device as possible.
Figure 14. Power-fail Comparator Waveform (STM690/704/802/804/805/806)
AI08861a
VCC
VRST
VSW (2.4V)
trec
RST
PFO
PFO follows PFI
PFO follows PFI


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