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MIC6315-31D2 Datasheet(PDF) 6 Page - Micrel Semiconductor |
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MIC6315-31D2 Datasheet(HTML) 6 Page - Micrel Semiconductor |
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6 / 9 page  Micrel MIC2772 Functional Block Diagram + Reset Threshold (V) VCC1 (8) RESET1 (7) RESET GENERATOR MR1 (1) GND1 (2) GND2 (4) VCC + Reset Threshold (V) VCC2 (6) RESET2 (5) RESET GENERATOR MR2 (3) VCC MIC2772 Block Diagram Application Information Reset Output, /RESET The /RESET pin is active low (open drain) pin. The /RESET pin is asserted whenever VCC falls below the reset threshold voltage or if /MR (manual reset) is forced low. The /RESET pin remains asserted for the duration of the threshold timeout period after VCC has risen above the reset threshold and/or /MR has returned high. The reset function ensures the microprocessor is properly reset and power up in a known condition after a power failure. /RESET will remain valid with VCC as low as 1.0V. The /RESET output is a simple open-drain N- channel MOSFET structure. A pull-up resistor must be used to pull this output to some voltage. For most applications, this voltage will be the same power supply that supplies VCC to MIC2772. It is possible however to tie this resistor to some other voltage. This will allow the MIC2772 to monitor one voltage while level-shifting the /RESET output to some other voltage. The pull-up voltage must be limited to 6.0V or less (absolute maximum) to avoid damage to the MIC2772. The resistor must be small enough to supply current to the inputs and leakage paths that are driven by the /RESET output. Manual Reset Input, /MR The ability to initiate a reset via external logic or a manual switch is provided in addition to the MIC2772’s automatic supervisory functions. Driving the /MR input to a logic low causes an immediate and unconditional reset to occur. Assuming VCC is within tolerance when /MR is released (returns high), the /RESET output will be de-asserted no less than tRESET later. /MR may be driven by a CMOS or TTL logic signal, or a mechanical switch. Typically, a momentary push-button switch is connected such that /MR is shorted to ground when the switch contacts close. Switch de-bouncing is performed internally; the switch may be connected directly between /MR and GND. /MR has an internal 20k Ω pull-up resistor (typical) to VCC and may be left open if unused. April 2005 6 M9999-042605 (408) 955-1690 |
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