参数资料
型号: EVAL-AD5100EBZ
厂商: Analog Devices Inc
文件页数: 17/36页
文件大小: 0K
描述: BOARD EVAL FOR AD5100
标准包装: 1
主要目的: 电源管理,电源监控器/跟踪器/序列发生器
已用 IC / 零件: AD5100
主要属性: 电压检测器和监控器
次要属性: 开漏极输出
已供物品:
AD5100
Standard Watchdog Mode
In the default standard watchdog mode, if WDI remains either
high or low for longer than the timeout period, t WD , a RESET
pulse is generated in an attempt to allow the system processor
to reestablish the WDI signal. The RESET pulses continue
indefinitely until a valid watchdog signal, a rising or falling edge
signal at the WDI, is received. The internal watchdog timer
clears whenever a reset is asserted. The standard WDI and
RESET timing diagrams are shown in Figure 13 .
Advanced Watchdog Mode
The AD5100 can be programmed into an advanced watchdog
mode. In this mode, if WDI remains either high or low for longer
than the timeout period, t WD , a RESET pulse is generated, as per
standard mode. However, if the WDI input remains i nactive after
three such RESET pulses, concurrent with the fourth RESET pulse,
SHDN is also asserted. SHDN is released after 1 second. These
actions repeat indefinitely (unless action is taken by the user), if
the processor is not responding. The advanced WDI and RESET
timing diagrams are shown in Figure 14 .
t WDI
WDI
RESET
t WD
t WDR
RESET PULSE
t WD
t WDR
CONTINUOUS PULSES UNTIL WATCHDOG AWAKES
t WDR = WATCHDOG-INITIATED RESET PULSE WIDTH
t WDI = WATCHDOG PULSE WIDTH
t WD = WATCHDOG PROGRAMMABLE TIME
Figure 13. Standard Watchdog—Pulsing Reset Until Watchdog Awakes
t WDI
WDI
RESET
t WD
t WDR
1 RESET PULSE
t WD
t WDI
3 RESET PULSES
t WD_SHDN
SHUTDOWN AT 4TH RESET PULSE
RELEASE AFTER 1s
SHDN
Figure 14. Advanced Watchdog—SHDN Asserted After Three Trials of Resetting the Watchdog (SHDN Released After 1 Second and the Cycle Repeats)
Rev. A | Page 17 of 36
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