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ASM1834AU Datasheet(PDF) 4 Page - PulseCore Semiconductor |
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ASM1834AU Datasheet(HTML) 4 Page - PulseCore Semiconductor |
4 / 10 page 4 of 10 Notice: The information in this document is subject to change without notice Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset November 2006 ASM1834/A/D rev 1.5 Manual Reset Operation Push-button switch input, PBRST, allows the user to override the internal trip point detection circuits and issue reset signals. The pushbutton input is debounced and is pulled HIGH through an internal 40k Ω resistor. When at least one of the reset outputs is not asserted, a push button initiated reset signal can be issued by holding PBRST LOW for at least 2ms. When PBRST is held LOW, both resets become active and remain active for approximately 350ms after PBRST returns HIGH. (See figures 3 and 4). Reset Output Signal Reset output signals are valid as long as either voltage at 5VIN or 3.3VIN is above 1.2V. In addition, the ASM1834 has push-pull outputs that can remain valid below a 1.2V input level. To sink current below 1.2V, a resistor should be connected from the RESET output to ground. This resistor guarantees a valid reset signal down to 0V. A 100k Ω value is suggested. The AS1834A open drain reset outputs require pull-up resistors and must be low enough in value to pull the output into a HIGH state. Resistor value is not critical in most applications and a value of 10k Ω is suggested. (See Figures 5 and 6). The ASM1834A open drain reset outputs can be connected to the same potential through a single pull-up resistor. In this configuration a failure on either supply will generate an active LOW reset. If the inputs are pulled-up to different voltages, the reset outputs (pin 2 and pin 7) cannot be connected to form a wired “AND” (see figure 7). VOH VOL RESET RESET PBRST tPB tPDLY VIH tRST Figure 4: Timing Diagram: Pushbutton Reset 1 2 3 4 5 6 7 8 3.3V 5V 3.3VIN 3.3V RESET 5VTOL GND PBRST 5VIN 5V RESET 3.3VTOL ASM1834 Figure 3: Pushbutton Reset RESET µP Input 100kΩ Figure 5: ASM1834 RESET Valid to 0V 1 2 3 4 5 6 7 8 3.3V 5V 3.3VIN 3.3V RESET 5VTOL GND PBRST 5VIN 5V RESET 3.3VTOL ASM1834 Figure 6: ASM1834A Open Drain Output Pull-Up Resistor 10kΩ 10kΩ VIL |
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