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MB3790PF 데이터 시트보기 (PDF) - Fujitsu

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MB3790PF Battery Backup IC Fujitsu
Fujitsu Fujitsu
MB3790PF Datasheet PDF : 21 Pages
First Prev 11 12 13 14 15 16 17 18 19 20
MB3790
3. Outputting Reset Signal Forcibly
The reset signal can be output forcibly by bringing the VSENSE pin of the MB3790 to a Low level (< 1.24). The reset
signal is held on until the capacitator CT is charged up after the VSENSE pin is released open.
Forced Reset Method 1
V IN
V IN
47K
SW
VSENSE
CT
CT
GND
Forced Reset Method 2
SW: Turned on (VRESET = High)
V IN
V IN
Control signal
input pin
10K
10K
47K
Q1
VSENSE
CT
CT
GND
When the voltage enough to turn on Q1 (approx. 1.2 V) gives to the Control signal input pin,
VRESET is equal to High level.
[Reset Pulse Width Calculation Formula]
Reset Pulse Width tPO (sec) = CT (F) ×106 (where CT = capacitance)
Example: When CT = 1000 pF, tPO = 1 ms (Typ)
16
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