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参数资料
| 型号： | R5109N271A-TR-FE |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封装： | HALOGEN FREE AND ROHS COMPLIANT, SSOP-8 |
| 文件页数： | 9/40页 |
| 文件大小： | 517K |
| 代理商： | R5109N271A-TR-FE |
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R510xx
17
(7) When the signal to the INH pin is set from "L" to "H", the watchdog starts supervising the system clock, or
charge cycle to the CT pin starts, the capacitor connected to the CT pin is charged with the current of setting
Reset time of WDT.
Watchdog Timeout period/Reset hold time
The watchdog timeout period and reset hold time can be set with an external capacitor to CT pin.
The next equations describe the relation between the watchdog timeout period and the external capacitor
value, or the reset hold time and the external capacitor value.
tWD (s)
= 3.1×106×C (F)
tWR (s)
= tWD/9
The watchdog timer (WDT) timeout period is determined with the discharge time of the external capacitor.
During the watchdog timeout period, if the clock pulse from the system is detected, WDT is cleared and the
capacitor is charged. When the charge of the capacitor completes, another watchdog timeout period starts
again. During the watchdog timeout period, if the clock pulse from the system is not detected, during the next
reset hold time RESETB pin outputs "L".
During the reset time, (while charging the external capacitor) and after starting the watchdog timeout period,
(just after from the discharge of the external capacitor) even if the clock pulse is input during the time period
"tWDI", the clock pulse is ignored.
tWDI (s)
= tWD/10
Released Delay Time (Power-on Reset delay time)
The released delay time can be set with an external capacitor connected to the CT pin. The next equation
describes the relation between the capacitance value and the released delay time (tPLH).
tPLH (s)
=3.7×106× C (F)
The capacitor connected to CT pin determines tWD, tWR, and tPLH.
When the VDD voltage becomes equal or less than (-VDET), discharge of the capacitor connected to the CT pin
starts. Therefore, if the discharge is not enough and VDD voltage returns to (+VDET) or more, thereafter the delay
time will be shorter than tPLH which is expected.
Power on Reset Operation against the input glitch (tPLH1 < tPLH)
VDD
VCT
VRESETB
Complete
Discharge
+VDET
-VDET
+VTCT
-VTCT
tPHL
0V
tPLH1
Incomplete
Discharge
0V
tPLH
tPHL
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