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STM703M6F bảng dữ liệu(PDF) 17 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  5 V supervisor with battery switchover
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STM703M6F bảng dữ liệu(HTML) 17 Page - STMicroelectronics

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STM690A/692A/703/704/802/805/817/818/819
Operation
Doc ID 10522 Rev 10
17/43
Figure 13.
Power-fail comparator waveform (STM817/818/819)
Figure 14.
Power-fail comparator waveform (STM690A/692A/703/704/802/805)
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.
AI08804a
VCC
VRST
VSO (or 2.4V)
trec
RST to ECON Delay (STM818)
RST
ECON (STM818)
PFO
(STM817/819)
PFO follows PFI
PFO follows PFI
AI08832a
VCC
VRST
2.4V (or VSO)
trec
RST
PFO
PFO follows PFI
PFO follows PFI



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