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參數(shù)資料
| 型號： | R5101G |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | Microprocessor power management with Watchdog Timer |
| 中文描述： | 微處理器電源管理看門狗定時器 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大?。?/td> | 330K |
| 代理商： | R5101G |
12345
Rev. 1.10 - 11 -
n
OPERATION
When V
DD
is turned on and Input Voltage reaches Vstart (nearly equal 0.8V), the output of RESET pin
becomes “L” level.
-
An External Capacitor starts to be charged through the C
D
pin when an Output Voltage of the Voltage
Regulator, V
OUT
, crosses the Released Voltage , +V
DET
, from Lower to Higher . The V
RESET
is kept “L” level
until Voltage of the C
D
pin , V
CD
, reaches to the Vref2H , about 1.0V , and after that the V
RESET
becomes to
“H” level.
\
tPR : Time interval between the timing of starting edge of forcing voltage to VDD pin and the timing of
reverse the voltage level of V
RESET
.
tPR can be set by connecting an external capacitor to C
D
pin, tPR can be calculated as shown below;
tPR (ms)
13000
′
C
D
(
m
F) ; C
D means a value of an external capacitor connected to C
D
pin.
When the voltage level of V
CD
reaches to the Vref2H, the external capacitor starts to be charged through
the C
TW
pin and the watchdog timer begins to operate.
ˉ
The operation mode for
t
he external capacitor changes from charging mode to discharging mode through
C
TW
pin when the voltage level of C
TW
pin , V
CTW
, reaches to the Vref2H.
°
While the C
TW
pin is on the discharging mode, if a clock pulse is entered (synchronous with a rising edge
of the pulse), the operation mode of C
TW
pin changes from charging mode to discharging mode. And
the external capacitor connected to C
TW
pin is charged until its voltage level reaches to Vref2H.
±
While the C
TW
pin
is on the discharging mode, if VCTW level drops to Vref2L, about 0.2V without clock
pulse to CLK pin, the voltage level of Reset pin becomes from “H” to “L”.
\
Watch Time of the watchdog timer , tWD , : Discharging Time of C
TW
pin level from Vref2H to Vref2L
tWD can be set by connecting an external capacitor to C
W
pin, tWD can be calculated as shown below;
tWD (ms)
10000
′
C
W
(
m
F);
Cw means a value of an external capacitor connected to Cw pin.
2
C
TW
pin is changed to charging mode from discharging mode when the Reset signal is generated.
\
Reset time of the watchdog timer , tWR , : Time interval between Charging time of the C
TW
pin from Vref2L
to Vref2H. tWR can be calculated by the next equation as shown below;
tWR (ms)
tWD/10
3
The Output Voltage level of Reset pin becomes from “H” to “L”, or a Reset signal is generated when an
output voltage of the Voltage Regulator drops to a level at equal or less than -Vdet.
′
The watchdog timer will be halted when a Voltage level of CE pin becomes to “L”. In this case, only the
watchdog timer is stopped and monitoring the output voltage is continued. After that, if the voltage level of CE
pin becomes to “H”, C
TW
pin starts to be on charging mode.
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