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ADM706PAN bảng dữ liệu(PDF) 8 Page - Analog Devices |
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8 / 8 page REV. A –8– ADM706P/R/S/T, ADM708R/S/T Microprocessor activity is monitored using the WDI input. This is driven using an output line from the processor. The software routines should toggle this line at least once every 1.6 seconds. If a problem occurs and this line is not toggled, then WDO goes low and a nonmaskable interrupt is generated. This interrupt routine may be used to clear the problem. If, in the event of inactivity on the WDI line, a system reset is required, then the WDO output should be connected to the input as shown in Figure 16. ADM706 RESET GND I/O LINE P MR PFI WDI WDO RESET Figure 16. RESET from WDO Monitoring Additional Supply Levels It is possible to use the power-fail comparator to monitor a second supply as shown in Figure 17. The two sensing resistors R1 and R2 are selected such that the voltage on PFI drops below 1.25 V at the minimum acceptable input supply. The PFO output may be connected to the MR input so that a RESET is gener- ated when the supply drops out of tolerance. In this case if either supply drops out of tolerance, a RESET will be generated. ADM706 RESET GND P MR PFI WDI PFO RESET VCC R1 R2 VX +3V/+3.3V Figure 17. Monitoring 3 V/3.3 V and an Additional Supply, VX Ps with Bidirectional RESET In order to prevent contention for microprocessors with a bidi- rectional reset line, a current limiting resistor should be inserted between the ADM70x RESET output pin and the µP reset pin. This will limit the current to a safe level if there are conflicting output reset levels. A suitable resistor value is 4.7 k Ω. If the re- set output is required for other uses, then it should be buffered as shown in Figure 18. ADM70x RESET GND P RESET GND BUFFERED RESET +3V/+3.3V VCC Figure 18. Bidirectional I-O RESET OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead SOIC (SO-8) 8-Lead Plastic DIP (N-8) SEATING PLANE 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) MAX 0.022 (0.558) 0.014 (0.356) 0.160 (4.06) 0.115 (2.93) 0.070 (1.77) 0.045 (1.15) 0.130 (3.30) MIN 8 14 5 PIN 1 0.280 (7.11) 0.240 (6.10) 0.100 (2.54) BSC 0.430 (10.92) 0.348 (8.84) 0.195 (4.95) 0.115 (2.93) 0.015 (0.381) 0.008 (0.204) 0.325 (8.25) 0.300 (7.62) 0.0098 (0.25) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41) 8 0 0.0196 (0.50) 0.0099 (0.25) 45 85 4 1 0.1968 (5.00) 0.1890 (4.80) 0.2440 (6.20) 0.2284 (5.80) PIN 1 0.1574 (4.00) 0.1497 (3.80) 0.0500 (1.27) BSC 0.0688 (1.75) 0.0532 (1.35) SEATING PLANE 0.0098 (0.25) 0.0040 (0.10) 0.0192 (0.49) 0.0138 (0.35) |
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