mb3790pf Fujitsu Microelectronics, Inc., mb3790pf Datasheet - Page 16

• Manufacturer Part Number: mb3790pf
• Description: Battery Backup Ic
• Manufacturer: Fujitsu Microelectronics, Inc.

16
MB3790
3. Outputting Reset Signal Forcibly
The reset signal can be output forcibly by bringing the V
signal is held on until the capacitor C
[Reset Pulse Width Calculation Formula]
Forced Reset Method 1
Forced Reset Method 2
Reset Pulse Width t
Example: When C
Control signal
input pin
When the voltage enough to turn on Q1 ( approx. 1.2 V) gives to the Control signal input pin,
V
RESET
V
IN
is equal to High level.
T
V
= 1000 pF, t
PO
SW
IN
(s) = C
10k
T
(F) 10
47k
PO
T
10k
= 1 ms (Typ)
is charged up after the V
6
(where C
SW: Turned on (V
Q1
V
V
47k
SENSE
IN
T
= capacitance)
SENSE
RESET
pin of the MB3790 to a Low level (< 1.24). The reset
V
V
SENSE
IN
SENSE
= High)
pin is released open.
GND
C
T
GND
C
T
C
T
C
T