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DS1813 Datasheet(PDF) 2 Page - Dallas Semiconductor |
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DS1813 Datasheet(HTML) 2 Page - Dallas Semiconductor |
2 / 5 page DS1813 2 of 5 OPERATION - POWER MONITOR The DS1813 provides the functions of detecting out-of-tolerance power supply conditions and warning a processor-based system of impending power failure. When VCC is detected as out-of-tolerance, the RST signal is asserted. On power-up, RST is kept active for approximately 150 µs after the power supply has reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RST is released. OPERATION - PUSHBUTTON RESET The DS1813 provides for a pushbutton switch for manual reset control. When the DS1813 is not in a reset cycle, a pushbutton reset can be generated by pulling the RST pin low for at least 1 ms. When the pushbutton is held low, the RESET is forced active low and will remain active low for about 150 ms after the pushbutton is released. See Figure 2 for an application example and Figure 3 for the timing diagram. BLOCK DIAGRAM (OPEN-DRAIN OUTPUT) Figure 1 APPLICATION EXAMPLE Figure 2 |
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