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| 型号： | ADM8695ARW-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVSR MPU 4.65V ADJ 16SOIC |
| 标准包装： | 1,000 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.65V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
ADM8690/ADM8691/ADM8695
WATCHDOG TIMER RESET
The watchdog timer circuit monitors the activity of the micro-
processor to check that it is not stalled in an indefinite loop.
An output line on the processor is used to toggle the watchdog
WDI
Data Sheet
input (WDI) line. If this line is not toggled within the selected
WDO
timeout period, a RESET pulse is generated.
The nominal watchdog timeout period is preset at 1.6 sec on
the ADM8690 . The ADM8691 / ADM8695 can be configured for
RESET
t 2
t 3
a fixed timeout period—short (100 ms) or long (1.6 sec)—or for
an adjustable timeout period. Some systems are unable to service
t 1
t 1
t 1
the watchdog timer immediately after a reset; in this case, if the
short period is selected for the ADM8691 / ADM8695 , the device
automatically selects the long timeout period directly after a
reset is issued. The watchdog timer is restarted at the end of a
reset, regardless of whether the reset was caused by lack of
activity on WDI or by V CC falling below the reset threshold.
The normal (short) timeout period becomes effective following
the first transition of WDI after RESET has gone inactive. The
watchdog timeout period restarts with each transition on the
WDI pin. To ensure that the watchdog timer does not time out,
either a high-to-low or low-to-high transition on the WDI pin
must occur by the end of the minimum timeout period. If WDI
remains permanently high or low, reset pulses are issued after
each long (1.6 sec) timeout period. The watchdog monitor can
be deactivated by allowing the watchdog input (WDI) to float
or by connecting it to midsupply.
On the ADM8690 the watchdog timeout period is fixed at
t 1 = RESET TIME
t 2 = NORMAL (SHORT) WATCHDOG TIMEOUT PERIOD
t 3 = WATCHDOG TIMEOUT PERIOD IMMEDIATELY FOLLOWING A RESET
Figure 16. Watchdog Timeout Period and Reset Active Time
The internal oscillator is enabled when OSC SEL is high or
floating. In this mode, OSC IN selects either the 1.6 sec watch-
dog timeout period or the 100 ms watchdog timeout period.
When OSC IN is connected high or left floating, the 1.6 sec
timeout period is selected; when OSC IN is connected low, the
100 ms timeout period is selected. In either case, the timeout
period is 1.6 sec immediately after a reset. This gives the micro-
processor time to reinitialize the system. If OSC IN is low, the
100 ms watchdog timeout period becomes effective after the
first transition of WDI. The software should be written such
that the input/output port driving WDI is left in its power-up
reset state until the initialization routines are completed and the
microprocessor is able to toggle WDI at the minimum watchdog
timeout period of 70 ms.
oscillator configurations that can be used to adjust the reset pulse
width and watchdog timeout period.
Table 5. ADM8691 and ADM8695 Reset Pulse Width and Watchdog Timeout Selections
Watchdog Timeout Period
Reset Active Period
OSC SEL
Low 1
Low 1
Floating or high
Floating or high
OSC IN
External clock input
External capacitor
Low
Floating or high
Normal
1024 CLKs
400 ms × C/47 pF
100 ms
1.6 sec
Immediately After Reset
4096 CLKs
1.6 sec × C/47 pF
1.6 sec
1.6 sec
512 CLKs
200 ms × C/47 pF
50 ms
50 ms
2048 CLKs
520 ms × C/47 pF
200 ms
200 ms
1
When the OSC SEL pin is low, OSC IN can be driven by an external clock signal, or an external capacitor (C) can be connected between OSC IN and GND. The nominal
internal oscillator frequency is 10.24 kHz. The nominal oscillator frequency with an external capacitor is f OSC (Hz) = 184,000/C (pF).
Rev. C | Page 12 of 24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM8695ARWZ | 功能描述:IC SUPERVSR MPU 4.65V ADJ 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| ADM8696 | 制造商:AD 制造商全称:Analog Devices 功能描述:Microprocessor Supervisory Circuits |
| ADM8696AN | 功能描述:IC SUPERVSR MPU ADJ/RESET 16DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| ADM8696ANZ | 功能描述:IC SUPERVSR MPU ADJ/RESET 16DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| ADM8696ARU | 制造商:AD 制造商全称:Analog Devices 功能描述:Microprocessor Supervisory Circuits |
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