- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄370417 > HA16117FB (Hitachi,Ltd.) CMOS Watchdog Timer PDF資料下載
參數(shù)資料
| 型號： | HA16117FB |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | CMOS Watchdog Timer |
| 中文描述： | 看門狗定時器的CMOS |
| 文件頁數(shù)： | 6/31頁 |
| 文件大?。?/td> | 249K |
| 代理商： | HA16117FB |
第1頁第2頁第3頁第4頁第5頁當(dāng)前第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁
HA16117F Series
6
Timing Waveforms and Functional Description
V
TL
V
CC
P-RUN
t
ON
t
OFF
t
RH
t
ON
t
RL
t
ON
t
ON
Crash
Watchdog function on
RES
(V
ACC
= "Low")
Watchdog function off
RES
(V
ACC
= "High")
Figure 1 Timing Waveforms
Watchdog On/Off Function
A feature of the HA16117F is that watchdog supervision can be switched on and off. When the watchdog
function is switched on, both the supply voltage and
P-RUN input are monitored to detect abnormal conditions. When the watchdog function is switched off
(standby mode), only the supply voltage is monitored. Watchdog supervision is switched on and off by the
input at the ACC pin (pin 7): Supervision is on when ACC is low, and off when ACC is high.
Many MPUs have a standby mode in which the CPU stops running but memory contents are retained. In
standby mode, program execution halts and I/O ports go to the high-impedance state, so there is no need for
the watchdog timer to supervise pulse output from an I/O port to detect abnormal conditions. Power can be
saved by placing both the MPU and HA16117F in standby mode at the same time. The HA16117F is
designed to draw a typical standby current I
STBY
of only 43
μ
A Typ when the watchdog function is switched
off.
ACC Pin (pin 7) and
RES
Output
When the MPU returns from standby mode to normal operation it generally takes 10 to 200 ms for the
clock oscillator in the MPU to stabilize. The
RES
signal is not output during this setup time. After the
setup time (t
SL
) has elapsed,
RES
is output if the P-RUN signal from the MPU is still abnormal.
t
SL
t
SH
Adjust according to
MPU’s setup time
RES (due to MPU crash)
ACC pin
Figure 2 ACC Pin and
RES
Output
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HA16117FC | CMOS Watchdog Timer |
| HA16117FPA | CMOS Watchdog Timer |
| HA16117FPAJ | CMOS Watchdog Timer |
| HA16117 | CMOS Watchdog Timer |
| HA16117F | CMOS Watchdog Timer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HA16117FC | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:CMOS Watchdog Timer |
| HA16117FPA | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:CMOS Watchdog Timer |
| HA16117FPAJ | 制造商:Renesas Electronics Corporation 功能描述:Processor Supervisor 4.4V 600uA 8-Pin SOP |
| HA16117FPB | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:CMOS Watchdog Timer |
| HA16117FPBJ | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:CMOS Watchdog Timer |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。