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| 型号： | DS1832S/T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/7页 |
| 文件大小： | 0K |
| 描述： | IC MICROMONITOR 3.3V 8-SOIC |
| 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： | 简单复位/加电复位 |
| 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 250 ms |
| 电压 - 阀值： | 2.55V，2.88V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
DS1832
The second function the DS1832 performs is pushbutton reset control. The DS1832 debounces the
pushbutton input and guarantees an active reset pulse width of 250 ms minimum. The third function is a
watchdog timer. The DS1832 has an internal timer that forces the reset signals to the active state if the
strobe input is not driven low prior to timeout. The watchdog timer function can be set to operate on
timeout settings of approximately 150 ms, 600 ms, or 1.2 seconds.
OPERATION - POWER MONITOR
The DS1832 detects out-of-tolerance power supply conditions and warns a processor-based system of
impending power failure. When V CC falls below a preset level as defined by TOL, the V CC comparator
outputs the signals RST and RST . When TOL is connected to ground, the RST and RST signals become
active as V CC falls below 2.98 volts. When TOL is connected to V CC , the RST and RST signals become
active as V CC falls below 2.64 volts. The RST and RST are excellent control signals for a microprocessor,
as processing is stopped at the last possible moments of valid V CC . On power-up, RST and RST are kept
active for a minimum of 250 ms to allow the power supply and processor to stabilize.
OPERATION - PUSHBUTTON RESET
The DS1832 provides an input pin for direct connection to a pushbutton reset (see Figure 2). The
pushbutton reset input requires an active low signal. Internally, this input is debounced and timed such
that RST and RST signals of at least 250 ms minimum are generated. The 250 ms delay commences as
the pushbutton reset input is released from the low level.
OPERATION - WATCHDOG TIMER
The watchdog timer function forces RST and RST signals active when the ST input is not clocked within
the predetermined time period. The timeout period is determined by the condition of the TD pin. If TD is
connected to ground the minimum watchdog timeout would be 62.5 ms, TD floating would yield a
minimum timeout of 250 ms, and TD connected to V CC would provide a timeout of 500 ms minimum.
Timeout of the watchdog starts when RST and RST become inactive. If a high-to-low transition occurs
on the ST input pin prior to timeout, the watchdog timer is reset and begins to timeout again. If the
watchdog timer is allowed to timeout, then the RST and RST signals are driven active for a minimum of
250 ms. 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
timeout. To guarantee that the watchdog timer does not timeout, a high-to-low transition must occur at or
less than the minimum times shown in Table 1. A typical circuit example is shown in Figure 4.
The DS1832 watchdog function cannot be disabled. The watchdog strobe input must be strobed to avoid
a watchdog timeout and reset.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1832U | 功能描述:监控电路 3.3V 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 |
| DS1832U/T&R | 制造商:Maxim Integrated Products 功能描述:3.3V UMONITOR LOW POWER 8P USOP T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MICROMONITOR 3.3V 8-USOP 制造商:Maxim Integrated Products 功能描述:Supervisory Circuits 3.3V MicroMonitor |
| DS1832U/T&R | 功能描述:监控电路 3.3V 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 |
| DS1832U+ | 功能描述:监控电路 3.3V 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 |
| DS1832U+T&R | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 2.88V 35UA 8USOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MICROMONITOR 3.3V 8-USOP 制造商:Maxim Integrated Products 功能描述:Supervisory Circuits 3.3V MicroMonitor |
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