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ADM8324 Supervisory Circuit with Windowed Watchdog, Manual Reset, and Active-Low Open-Drain Reset Output

The ADM8323/ADM8324 are supervisory circuits that monitor power supply voltage levels and code execution integrity in microprocessor-based systems. An on-chip watchdog timer checks for activity within a preset timeout window. A reset signal can also be asserted by an external push button through a manual reset input. The RESET output is either a 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 watchdog input (WDI). Each part is available in a choice of 26 reset threshold options from 2.5 V to 5 V in 100 mV increments. There are also four reset timeout options of 1 ms, 20 ms, 140 ms, and 1120 ms (minimum). The ADM8323/ADM8324 are available in 5-lead SOT-23 packages and typically consume only 10 µA, making them suitable for use in low power portable applications.   APPLICATIONS Automotive Microprocessor systems Computers Controllers Intelligent instruments Portable equipment

APPLICATIONS

• Automotive
• Microprocessor systems
• Computers
• Controllers
• Intelligent instruments
• Portable equipment

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Reference Materials

• Product Selection Guide：Supervisory Devices Complementary Parts Guide for Altera FPGAs
• Product Selection Guide：Supervisory Devices Complementary Parts Guide for Xilinx FPGAs
• Solutions Bulletins & Brochures：Voltage Monitoring Products Applications Guide