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MIC2775-28YM5 Datasheet(PDF) 6 Page - Micrel Semiconductor |
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MIC2775-28YM5 Datasheet(HTML) 6 Page - Micrel Semiconductor |
6 / 9 page Micrel, Inc. MIC2775 March 23, 2015 6 Revision 4.0 Functional Diagram Functional Description VDD Input The VDD pin is both the power supply terminal and a monitored input voltage. The voltage at this pin is continually compared against the internal reference. The trip-point at which a reset occurs is factory-programmed. A reset is triggered if and when VDD falls below the trip- point. Hysteresis is employed to prevent chattering due to noise. The comparator on the VDD input is relatively immune to very brief negative-going transients. RST, /RST Reset Outputs Typically, the MIC2775 is used to monitor the power supply of intelligent circuits such as microcontrollers and microprocessors. By connecting the appropriate reset output of an MIC2775 to the reset input of a µC or µP, the processor will be properly reset at power-on, power- down, and brown-out conditions. In addition, asserting /MR, the manual reset input, will activate the reset function. The reset outputs are asserted any time /MR is asserted or if VDD drops below the threshold voltage. The reset outputs remain asserted for tRST(min) after VDD subsequently returns above the threshold boundary and/or /MR is released. A reset pulse is also generated at power-on. Hysteresis is included in the comparator to prevent chattering of the outputs due to noise. /MR, Manual Reset Input The ability to initiate a reset via external logic or a manual switch is provided in addition to the MIC2775’s automatic supervisory functions. Driving the /MR input to a logic-low causes an immediate and unconditional reset to occur. Assuming VDD is within tolerance when /MR is released (returns high), the reset outputs will be de-asserted no less than tRST later. /MR may be driven by a logic signal or mechanical switch. Typically, a momentary push- button switch is connected such that /MR is shorted to ground when the switch contact close. The switch may be connected directly between /MR and GND. /MR has an internal 100nA pull-up current to VDD and may be left open if unused. |
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