R5101G RICOH Co.,Ltd., R5101G Datasheet - Page 9
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R5101G
Manufacturer Part Number
R5101G
Description
Microprocessor Power Management With Watchdog Timer
Manufacturer
RICOH Co.,Ltd.
Datasheet
1.R5101G.pdf
(16 pages)
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TYPICAL APPLICATION
TECHNICAL NOTES
* If an equal or less than 100us-width "L" pulse is input to the CE pin, the error reset may output. The equal or less than
100us width "L" pulse caused by some noise or something against the CE pin must be avoided.
short as possible.
supervises the built-in regulator output, therefore the noise may be detected.
clock pulse. Therefore, during the ignoring time, input clock pulse (rising edge trigger) is ignored. The ignoring
time is approximately as follows:
1) The time interval for V
2) The time interval for V
C
C
Use a 0.01µF or more value of an external capacitor, C
Use 1µF or 2.2µF capacitor between V
Make V
Power noise may a cause of incorrect operation of the watchdog timer, because the built-in detector
If the capacitance for C
To avoid the mis-operation, during watchdog timer monitoring time, there is some ignoring time against
D
W
(0.001µF)
(0.01µF)
DD
and GND lines sufficient.
1µF
SCK
C
C
V
DD
D
TW
CTW
CTW
TW
pin is too large, pick-up noise may be result.
pin voltage from V
pin voltage from V
R5101GxxxSeries
DD
and GND, and between V
REF
REF
2H to (V
2L+V
REF
W
2L/20 to V
REF
for setting watchdog and reset time-out periods.
RESET
CE
GND
V
2H-V
OUT
REF
REF
2H/20)
2L
OUT
510kΩ
1µF
and GND and make its wiring as
D
RESET
V
OUT
DD
µ con.
R5101G
9