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ADM1232ARMZ1 データシート(PDF) 6 Page - Analog Devices |
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ADM1232ARMZ1 データシート(HTML) 6 Page - Analog Devices |
6 / 12 page ADM1232 Rev. C | Page 6 of 12 CIRCUIT INFORMATION PB RESET STROBE TIMEOUT SELECTION The PB RESET input makes it possible to manually reset a system using either a standard push-button switch or a logic low input. An internal debounce circuit provides glitch immunity when used with a switch, reducing the effects of glitches on the line. The debounce circuit is guaranteed to cause the ADM1232 to assert a reset if PB RESET is brought low for more than 20 ms and is guaranteed to ignore low inputs of less than 1 ms. TD (time delay) set is used to set the strobe timeout period. The strobe timeout period is the maximum time between high-to- low transitions that STROBE accepts before a reset is asserted (see ). The strobe timeout settings are listed in . Figure 8 Table 5 Table 5. Strobe Timeout Settings Condition Min Typ Max Unit TD = 0 V 62.5 150 250 ms TD = Floating 250 600 1000 ms TD = VCC 500 1200 2000 ms MICROPROCESSOR GND TOLERANCE RESET STROBE RESET PB RESET I/O ADM1232 VCC VCC TD STROBE PULSE WIDTH STROBE TIMEOUT PERIOD STROBE RESET Figure 8. STROBE Parameters Figure 6. Typical Push-Button Reset Application RESET PB RESET VIL RESET ACTIVE TIME PB RESET DELAY PB RESET TIME VIH 5V VCC RESET 5V 4.5V (5% TRIP POINT) RESET OUTPUT DELAY HEN VCC IS FALLING RESET OUTPUT DELAY WHEN VCC IS RISING W 4.25V (10% TRIP POINT) RESET Figure 9. Reset Output Delay TOLERANCE Figure 7. PB RESET The TOLERANCE input is used to determine the level at which VCC can vary below 5 V without the ADM1232 asserting a reset. Connecting TOLERANCE to GND selects a −5% tolerance level and causes the ADM1232 to generate a reset if VCC falls below 4.75 V. If TOLERANCE is connected to VCC, a −10% tolerance level is selected, which causes the ADM1232 to generate a reset if VCC falls below 4.5 V. See the parameters for the VCC trip point in the Specifications section for more information. RESET AND RESET OUTPUTS RESET is capable of sourcing and sinking current, whereas RESET is an open-drain MOSFET that sinks current only. Therefore, it is necessary to pull this output high. |
同様の部品番号 - ADM1232ARMZ1 |
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同様の説明 - ADM1232ARMZ1 |
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