欢迎访问ic37.com |
会员登录 免费注册
发布采购

HA16117FPBJ 参数 Datasheet PDF下载

HA16117FPBJ图片预览
型号: HA16117FPBJ
PDF下载: 下载PDF文件 查看货源
内容描述: CMOS看门狗定时器 [CMOS Watchdog Timer]
分类和应用: 光电二极管
文件页数/大小: 31 页 / 250 K
品牌: HITACHI-METALS [ HITACHI METALS, LTD ]
 浏览型号HA16117FPBJ的Datasheet PDF文件第2页浏览型号HA16117FPBJ的Datasheet PDF文件第3页浏览型号HA16117FPBJ的Datasheet PDF文件第4页浏览型号HA16117FPBJ的Datasheet PDF文件第5页浏览型号HA16117FPBJ的Datasheet PDF文件第7页浏览型号HA16117FPBJ的Datasheet PDF文件第8页浏览型号HA16117FPBJ的Datasheet PDF文件第9页浏览型号HA16117FPBJ的Datasheet PDF文件第10页  
HA16117F Series  
Timing Waveforms and Functional Description  
VTL  
VCC  
P-RUN  
Crash  
tRH  
Watchdog function on  
RES  
tON  
tOFF  
tON  
(VACC = "Low")  
tRL  
Watchdog function off  
RES  
tON  
tON  
(VACC = "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 ISTBY of only 43 µA 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 (tSL) has elapsed, RES is output if the P-RUN signal from the MPU is still abnormal.  
Adjust according to  
MPU’s setup time  
ACC pin  
tSH  
tSL  
RES (due to MPU crash)  
Figure 2 ACC Pin and RES Output  
6
 复制成功!