ADM8324 Datasheet | Analog Devices

Supervisory Circuits with Windowed Watchdog and Manual Reset in 5-Lead SOT-23 Data Sheet Features Windowed watchdog, 8 timeout options 26 reset threshold options 2.5 V to 5 V in 100 m V increments 4 reset timeout options 1 ms, 20 ms, 140 ms, and 1120 ms (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 ADM8323 VCC VCC VREF ADM8323/ADM8324 FUNCTIONAL BLOCK DIAGRAMS RESET GENERATOR RESET DEBOUNCE WINDOWED WATCHDOG DETECTOR 11802-001 Figure 1. APPLICATIONS Automotive Microprocessor systems puters Controllers Intelligent instruments Portable equipment VREF RESET GENERATOR RESET DEBOUNCE WINDOWED WATCHDOG DETECTOR 11802-002 Free Datasheet http://.. Figure 2. GENERAL DESCRIPTION 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 switch through a manual reset input. The RESET output is either pushpull (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). There are eight different watchdog windows available, as shown in Table 5. Each device is available in a choice of 26 reset threshold options from 2.5 V to 5 V in 100 m V increments. There are also four reset timeout options of 1 ms, 20 ms, 140 ms, and 1120 ms (minimum). The ADM8323/ADM8324 are...