ADM824 Datasheet PDF | Analog Devices

Analog Devices ADM824

The ADM823/ADM824/ADM825 are supervisory circuits that monitor power supply voltage levels and code execution integrity in microprocessor-based systems. The three parts feature different combinations of watchdog input, manual reset input, and output stage configuration, as shown in Table 1. These parts are available in a choice of seven reset threshold options ranging from 2.19 V to 4.63 V.

Part No.	ADM824
Datasheet	ADM824 Download
Manufacturer	Analog Devices
Description	Supervisory Circuits
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FEATURES

Precision 2.5 V to 5 V power supply monitor 7 reset threshold options: 2.19 V to 4.63 V 140 ms (minimum) reset timeout Watchdog timer with 1.6 sec timeout (ADM823, ADM824) Manual reset input (ADM823, ADM825) Push-pull output stages RESET (ADM823) RESET, RESET (ADM824/ADM825) Low power consumption: 5 µA Guaranteed reset output valid to VCC = 1 V Power supply glitch immunity Specified over automotive temperature range 5-lead SC70 and SOT-23 packages FUNCTIONAL BLOCK DIAGRAM ADM823 VCC VREF RESET GENERATOR VCC RESET MR DEBOUNCE WATCHDOG DETECTOR GND WDI Figure 1. 04534-001

APPLICATIONS

Microprocessor systems Computers Controllers Intelligent instruments Portable equipment

GENERAL DESCRIPTION

In addition to providing power-on reset signals, an on-chip watchdog timer can reset the microprocessor if it fails to strobe within a preset timeout period. A reset signal can also be asserted by an external pushbutton, through a manual reset input. The reset and watchdog timeout periods are fixed at 140 ms (minimum) and 1.6 sec (typical), respectively.