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ADM809MART-REEL Datasheet(PDF) 5 Page - Analog Devices |
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ADM809MART-REEL Datasheet(HTML) 5 Page - Analog Devices |
5 / 6 page ADM809/ADM810 –5– REV. 0 INTERFACING TO OTHER DEVICES OUTPUT The ADM809/ADM810 Series is designed to integrate with as many devices as possible and therefore has a standard output dependant on VCC. This enables the part to be used in both 3 V and 5 V or any nominal voltage within the minimum and maxi- mum specifications for VCC. Because of this design approach, interfacing this device to other devices is simplified. ENSURING A VALID RESET OUTPUT DOWN TO VCC = 0 V When VCC falls below 0.8 V, ADM809’s RESET no longer sinks current. A high impedance CMOS logic input connected to RESET may, therefore, drift to undetermined logic levels. To eliminate this problem a 100 k Ω resistor should be connected from RESET to ground. VCC VCC GND RESET ADM809 Figure 10. Ensuring a Valid RESET Output Down to VCC = 0 V THE BENEFITS OF A VERY ACCURATE RESET THRESHOLD In other microprocessor supervisory circuits, tolerances in sup- ply voltages lead to an overall increase in RESET tolerance levels due to the deterioration of the microprocessor RESET circuit’s power supply. The possibility of a malfunction during a power failure is greatly reduced because the ADM809 and ADM810 series can operate effectively even when there are large degradations of the supply voltages. Another advantage of the ADM809 and ADM810 series is its very accurate internal voltage reference circuit. These benefits combine to produce an exceptionally reliable Voltage Monitor Circuit. INTERFACING TO MICROPROCESSORS WITH MULTIPLE INTERRUPTS In a number of cases it is necessary to interface many interrupts from different devices (i.e., thermal, attitude and velocity sen- sors). The ADM809 and ADM810 can easily be integrated into existing interrupt-handling circuits (Figure 11) or used as a stand-alone device. PRIORITY ENCODER 74LS147 4 LINE BCD TO µP VCC ADM809 GND RESET OTHER SENSING DEVICES VCC Figure 11. Interfacing to µPs with Multiple Interrupts |
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