Features and Benefits
- Precision Voltage Monitor (4.31 V)
- Selectable Watchdog Timeout—0.75 ms, 1.5 ms, 12.5 ms, 25 ms
- Watchdog Timeout Monitor
- Two RESET Outputs
The ADM9690 contains a voltage monitoring comparator and a watchdog timer monitor. It is designed to monitor the 5 V power supply to a microprocessor and the microprocessor operation via a watchdog function.
The voltage monitoring comparator monitors the voltage on VMON. If it drops outside tolerance, as will happen during a power-fail, two reset signals are generated. Both reset signals go active (low) simultaneously. They will remain active while VMON is below the threshold, and for 50 ms (RESET(1)) or 60 ms (RESET(2)) after VMON climbs above the reset threshold. RESET(1) is intended to provide a power-on reset signal for the µP while RESET(2) is used to hold additional circuitry in a reset state until the µP has regained control following a power-up. The voltage monitoring circuitry remains operational with VCC as low as 2 V.
The watchdog timer monitoring circuit is designed to monitor the activity on the WDI input. This input is normally connected to an output line on the µP. Its function is to check that the microprocessor has not stalled in an infinite loop. If there is a period of inactivity for the watchdog timeout period, both reset outputs are activated. As above, RESET(1) remains low for 50 ms while RESET(2) remains low for an additional 10 ms. The watchdog timer is restarted when RESET(1) goes inactive. The actual watchdog timeout period is adjustable using two select inputs SEL1 and SEL2.
The ADM9690 is available in an 8-lead SOIC package. It is specified over the industrial temperature range.
- Microprocessor Systems
- Intelligent Instruments
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|ADM9690ARNZ||Material Declaration||Reliability Data||8-Lead SOIC|
|ADM9690ARNZ-REEL||Material Declaration||Reliability Data||8-Lead SOIC|
|Wafer Fabrication Data|
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