STM817L 查看數據表（PDF） - STMicroelectronics

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STM817L

5 V supervisor with battery switchover

STMicroelectronics 

STM690A/692A/703/704/802/805/817/818/819

Figure 13. Power-fail comparator waveform (STM817/818/819)

VCC

VRST

VSO (or 2.4V)

PFO

(STM817/819)

PFO follows PFI

RST

RST to ECON Delay (STM818)

ECON (STM818)

Operation

trec

PFO follows PFI

AI08804a

Figure 14. Power-fail comparator waveform (STM690A/692A/703/704/802/805)

VCC

VRST

2.4V (or VSO)

PFO

PFO follows PFI

trec

PFO follows PFI

RST

AI08832a

2.10

Using a SuperCap™ as a backup power source

SuperCaps™ are capacitors with extremely high capacitance values (e.g., 0.47 F) for their

size. Figure 15 shows how to use a SuperCap as a backup power source. The SuperCap

may be connected through a diode to the 5 V supply. Since VBAT can exceed VCC while VCC

is above the reset threshold, there are no special precautions for using these supervisors

with a SuperCap.

Doc ID 10522 Rev 10

17/43

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