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| 型号： | DS1831DS/T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC MULTIMON 3.3/2.5V WDOG 16SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | MicroMonitor™ |
| 类型： | 多压监控器 |
| 监视电压数目： | 3 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 10 ms；100 ms；1,000 ms |
| 电压 - 阀值： | 2.5V，3.3V，可调 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
DS1831C/D/E
OPERATION—WATCHDOG TIMER
The watchdog timer function (DS1831D only) forces the WDS signal active (low) when the ST input
does not have a transition (high-to-low or low-to-high) within the predetermined time period. The
time-out period is determined by the condition of the TD WD pin (see Table 1). If TD WD is connected to
ground the minimum watchdog time-out would be 10ms, TD floating would yield a minimum time-out of
100ms, and TD WD connected to V CC would provide a time-out of 1000ms minimum. Time-out of the
watchdog starts when at least one of the RST outputs becomes inactive (high). If a transition occurs on
the ST input pin prior to time-out, the watchdog timer is reset and begins to time-out again. If the
watchdog timer is allowed to time-out, then the WDS output is pulsed active for a minimum of 100μs.
The WDS output is an open-drain output and must be pulled up externally. In most applications this
output would be connected to one of the Pushbutton inputs and would not require an external pull-up
resistor. The value of the resistors is not critical in most cases but must be set low enough to pull the
output to a high state. A common value used is 10k W . If a WDS output is connected to a pushbutton input
an additional pull-up resistor can be used (to improve speed of transitions) but is not required.
The ST input can be derived from many microprocessor outputs. The most typical signals used are the
microprocessor address signals, data signals, or control signals. When the microprocessor functions
normally, these signals would, as a matter of routine, cause the watchdog to be reset prior to time-out. To
guarantee that the watchdog timer does not time-out, a transition must occur at or less than the minimum
times shown in Table 1. A typical circuit example is shown in Figure 10. The watchdog timing is shown
in Figure 11.
The DS1831A watchdog function cannot be disabled. The watchdog strobe input must be strobed to avoid
a watchdog time-out however the watchdog status output can be disconnected yielding the same result.
WATCHDOG CIRCUIT EXAMPLE Figure 10
V SENSE1
V CC
R1
PBRST 2.5V
PBRST 3.3V
μP
R2
IN1
ST
DS1831D
NMI1
WDS
10 k W
GND
TD WD
10 of 15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1831E | 功能描述:监控电路 3.3/5V Multisupply MicroMonitor RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| DS1831E+ | 功能描述:监控电路 3.3/5V Multisupply MicroMonitor RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| DS1831ES | 功能描述:监控电路 3.3/5V Multisupply MicroMonitor RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| DS1831ES/T&R | 制造商:Maxim Integrated Products 功能描述:3.3V/2.5V MULTISUPPLY MICROMONITOR - Tape and Reel |
| DS1831ES/T&R | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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