Low_power_micromonitor_with_pushbutton

Published:2009/7/24 12:09:00 Author:Jessie | From:SeekIC

This circuit shows a DS1232LP/LPS used to monitor and control the power supply and software execution of a processor-based system, and to provide a pushbutton reset. When VCC falls below a preset level (as defined by the TOL pin connection) the DS1232 outputs RST and RST reset signals. With TOL connected to ground, reset becomes active as VCC falls below 4.75 V. When TOL is connected to VCC, reset becomes active as VCC falls below 4.5 V. On power-up, RST and RST are kept active for a minimum of 250 ms to allow the power supply and processor to stabilize. The pushbutton reset input PBRST requires an active low. Internally, this input is debounced and timed so that reset signals of at least 250 ms (minimum) are generated. The 250-ms delay starts as the pushbutton reset input is released from low level. Dallas Semiconductors, Product Data Book, 1992/1993, p. 10-54.



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