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ADM6315-26D1ARTZRL Datasheet(PDF) 7 Page - Analog Devices |
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ADM6315-26D1ARTZRL Datasheet(HTML) 7 Page - Analog Devices |
7 / 12 page ADM6315 Rev. E | Page 7 of 12 THEORY OF OPERATION MANUAL RESET INPUT INTERFACING TO OUTPUT OF OTHER DEVICES The ADM6315 also provides an additional input, MR. This input can be used either as a means for the system operator to reset the system manually via a switch or for a digital circuit to reset the system. The ADM6315 series is designed to integrate with as many devices as possible. One feature of the ADM6315 is the RESET open- drain output, which can sink current from sources with a voltage greater than the VCC of the ADM6315 input, making it suitable for use in more diverse applications. MR The input (typically) ignores negative-going pulses that are faster than 100 ns, and it is guaranteed to accept any negative- going input pulse of a duration greater than or equal to 1 μs. If BENEFITS OF A VERY ACCURATE RESET THRESHOLD Because the ADM6315 series can operate effectively even when there are large degradations of the supply voltages (due to an accurate internal voltage reference circuit), the possibility of a malfunction during a power failure is greatly reduced. MR is connected to long cables or is used in a noisy environment, placing a 1 μF decoupling capacitor between the MR input and ground further improves the glitch immunity of the ADM6315. VCC TRIP POINT (MAX) VCC TRIP POINT VCC VCC TRIP POINT (MIN) RESET RESET ACTIVE TIMEOUT RESET VOL VCC TRIP POINT (MAX) VCC TRIP POINT VCC TO RESET DELAY VCC VCC TRIP POINT (MIN) Figure 10. VCC Power-Down/Brownout Timing Diagram Figure 11. VCC Power-Up Timing Diagram DETAILED DESCRIPTION TRANSIENT IMMUNITY The ADM6315 is designed to protect the integrity of a system’s operation by ensuring the proper operation of the system during power-up, power-down, and brownout conditions. As well as being an accurate reset circuit, the ADM6315 has good immunity from negative-going transients (see Figure 7). Because of this characteristic, the ADM6315 is suitable for use in noisy environments. RESET When the ADM6315 is powered up, the output of the ADM6315 remains low for a period typically equal to the RESET active timeout period. This feature allows adequate time for the system to power up correctly and for the power supply to stabilize before any devices are brought out of reset and allowed to begin executing instructions. Initializing a system in this way provides a more reliable startup for microprocessor systems. RESET When a brownout condition occurs (assuming VCC is falling at 1 mV/μs), the ADM6315 produces a reset in 35 μs typical. Producing a reset this fast means that the entire system can be reset together before any part of the system’s voltage falls below its recommended operating voltage. This system reset can avoid dangerous and/or erroneous operation of a microprocessor- based system. Figure 7 shows the comparator overdrive (the maximum magnitude of negative-going pulses with respect to the typical reset threshold) vs. the pulse duration without a reset. |
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