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ADM809-5L bảng dữ liệu(PDF) 7 Page - Analog Devices |
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ADM809-5L bảng dữ liệu(HTML) 7 Page - Analog Devices |
7 / 8 page ADM809-5L/ADM809-5S Rev. B | Page 7 of 8 THEORY OF OPERATION INTERFACING TO OUTPUT OF OTHER DEVICES The ADM809-5L/ADM809-5S are designed to integrate with as many devices as possible and, therefore, have an output dependent on VCC. Because of this design approach, interfacing these devices to other devices is simplified. ENSURING A VALID RESET OUTPUT DOWN TO VCC = 0 V When VCC falls below 0.8 V, the ADM809-5L/ADM809-5S 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 kΩ resistor should be connected from RESET to ground. GND 100kΩ ADM809-5L/ ADM809-5S VCC VCC RESET Figure 10. Ensuring a Valid RESET Output Down to VCC = 0 V BENEFITS OF A VERY ACCURATE RESET THRESHOLD In other microprocessor supervisory circuits, tolerances in supply voltages lead to an overall increase in RESET tolerance levels due to the deterioration of the RESET circuit power supply of the microprocessor. The possibility of a malfunction during a power failure is greatly reduced because the ADM809-5L/ ADM809-5S can operate effectively even when there are large degradations of the supply voltages. Another advantage of the ADM809-5L/ADM809-5S 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 to many interrupts from different devices (for example, from thermal, attitude, and velocity sensors). The ADM809-5L/ADM809-5S can be easily integrated into existing interrupt-handling circuits (see Figure 13) or used as standalone devices. 4-LINE BCD TO MICROPROCESSOR ADM809 GND VCC VCC RESET OTHER SENSING DEVICES PRIORITY ENCODER 74LS147 Figure 11. Interfacing to Microprocessors with Multiple Interrupts ADM809-5L/ ADM809-5S VCC 100nF 3.3V RESET GND 2 1 3 47kΩ 47kΩ Figure 12. Alternative Application Circuit with Extra Decoupling ADM809-5L/ ADM809-5S VCC 100nF 3.3V RESET GND 2 1 3 22kΩ Figure 13. Additional Decoupling Can Be Achieved Using a 100 nF Capacitor Between VCC and Ground |
Số phần tương tự - ADM809-5L_15 |
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Mô tả tương tự - ADM809-5L_15 |
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