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参数资料
| 型号： | ADM9690 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | Power Supply and Watchdog Timer Monitoring Circuit |
| 中文描述： | 电源供应器和看门狗定时器监测电路 |
| 文件页数： | 5/6页 |
| 文件大小： | 76K |
| 代理商： | ADM9690 |
ADM9690
–
5
–
REV. A
POWER SUPPLY AND WATCHDOG MONITORING
CIRCUIT
The ADM9690 contains a power supply voltage monitoring
comparator and a watchdog timer monitor. Either V
MON
drop-
ping outside tolerance or the watchdog timer timing out results
in a reset sequence as discussed below. Two reset outputs are
provided. RESET(1) and RESET(2).
POWER FAIL/POWER-ON
RESET
When V
MON
falls below the reset threshold (4.4 V) both RESET
outputs are forced low immediately.
On power-up, RESET(1) will remain low for 50 milliseconds
after V
MON
rises above the reset threshold. This provides a
power-on reset for the microprocessor. RESET(2) remains
active low for an additional 10 ms. RESET(1) is intended to
WATCHDOG
TRANSITION
DETECTOR
V
CC
V
MON
OSC SEL1
OSC SEL2
RESET(2)
TIMER
RESET(1)
TIMER
4.31V
ADM9690
RESET(1)
RESET(2)
WATCHDOG
INPUT (WDI)
GND
WATCHDOG
TIMEBASE
Figure 6. Functional Block Diagram
provide a power-on reset signal for the
μ
P while RESET(2) is
used to hold additional circuitry in a reset state until the
μ
P has
regained control following a power-up.
The guaranteed minimum and maximum thresholds for the
ADM9690 are 4.3 V and 4.5 V.
Watchdog Timer
RESET
The watchdog timer circuit monitors the activity of the micro-
processor in order to check that it is not stalled in an infinite
loop. An output line on the processor may be used to toggle the
Watchdog Input (WDI) line. If this line is not toggled within the
selected timeout period, both RESET outputs are taken active
(low). RESET(1) remains low for 50 ms and RESET(2) re-
mains low for an additional 10 ms . Each transition (either
positive-going or negative-going) of WDI after RESET(1) has
gone inactive restarts the watchdog timer. The actual watchdog
timeout period is adjustable using SEL1 and SEL2. Four timeout
periods are selectable. Please refer to Table I.
The watchdog timer is restarted at the end of RESET(1)
(RESET(1) going high), whether the reset was caused by lack of
activity on WDI or by V
MON
falling below the reset threshold.
Table I.
Watchdog Timeout
Period t
WD
(ms)
0.75
1.5
12.5
25
SEL2
SEL1
0
0
1
1
0
1
0
1
V
MON
t
2
t
1
RESET(1)
RESET(2)
Figure 7. Power-On
RESET
Timing
WDI
t
2
t
1
RESET(1)
RESET(2)
t
WD
Figure 8. Watchdog
RESET
Timing
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM9690AR | 制造商:AD 制造商全称:Analog Devices 功能描述:Power Supply and Watchdog Timer Monitoring Circuit |
| ADM9690ARN | 制造商:Rochester Electronics LLC 功能描述:SUPERVISOR WITH 2 RESETS I.C. - Bulk 制造商:Analog Devices 功能描述:SUPERVISORY CIRCUIT 9690 SOIC8 |
| ADM9690ARN-REEL | 制造商:Analog Devices 功能描述:Processor Supervisor 4.31V 4.31V 8-Pin SOIC N T/R |
| ADM9690ARNZ | 功能描述:IC SUPERVISOR PS/WATCHDOG 8SOIC 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 |
| ADM9690ARNZ-REEL | 功能描述:IC SUPERVISOR PS/WATCHDOG 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:400 系列:- 类型:备用电池电路 监视电压数目:1 输出:开路漏极，推挽式 复位:高有效/低有效 复位超时:最小为 35 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) 其它名称:ADM691ARZ-REEL7TR |
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