Analog Devices Inc. ADM8323/4 监控电路
亚德诺半导体 ADM8323/ADM8324 监控电路可监控微处理器系统中的电源电压和代码执行完整性。一个片上看门狗计时器可监测预定超时窗口内的活动。复位信号也可以由外部按钮开关通过手动复位输入引脚进行置位。RESET 输出为推挽式（ADM8323）或开漏型（ADM8324）。看门狗故障可导致 RESET 引脚输出低电平。故障既可由看门狗快速错误（看门狗脉冲互相靠得太紧密）触发，也可由看门狗慢速错误（超时期间没有看门狗脉冲）触发。这实际上给出了一个窗口，可观察看门狗脉冲。看门狗超时从看门狗输入（WDI）的上一个下降沿开始测量。ADM8323/ADM8324 采用 5 引脚 SOT-23 封装，功耗典型值仅为 10μA，适用于低功耗、便携式应用。
The RESET output is either push-pull (ADM8323) or open-drain (ADM8324). A watchdog failure results in a low output on the RESET pin. A failure can be triggered either by a fast watchdog error (watchdog pulses too close together) or by a slow watchdog error (no watchdog pulse within the timeout period). This effectively gives a window in which to observe the watchdog pulse. The watchdog timeout is measured from the last falling edge of the watchdog input (WDI).
The ADM8323/ADM8324 are available in a 5-lead SOT-23 package and typically consume only 10μA, making them suitable for use in low power portable applications.
特性
- Reset Threshold 2.901V (minimum) to 2.959V at TA=25°C
- Timeout 140ms (minimum)
- Manual reset input
- Open-drain or push-pull RESET outputs
- Low power consumption
- Specified over wide temperature range (-40°C to +125°C)
- Qualified for automotive applications
- 5-lead SOT-23 package
