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ASM1832 Datasheet(PDF) 3 Page - Alliance Semiconductor Corporation |
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ASM1832 Datasheet(HTML) 3 Page - Alliance Semiconductor Corporation |
3 / 9 page 3 of 9 Notice: The information in this document is subject to change without notice 3.3V µP Power Supply Monitor and Reset Circuit ASM1832 rev 1.5 February 2005 Detailed Description The ASM1832 monitors the microprocessor or microcontroller power supply and issues reset signals, both active HIGH and active LOW, that halt processor operation whenever the power supply voltage levels are outside a predetermined tolerance. RESET and RESET outputs RESET and RESET signals are active for a minimum of 250ms after the supply has returned to in-tolerance level. This allows the power supply and monitored processor to stabilize before instruction execution is allowed to begin. Trip Point Tolerance Selection The TOL input is used to determine the level VCC can vary below 3.3V without asserting a reset. With TOL conected to VCC, RESET and RESET become active whenever VCC falls below 2.64V. RESET and RESET become active when the VCC falls below 2.98V if TOL is connected to ground. After VCC has risen above the trip point set by TOL, RESET and RESET remain active for a minimum time period of 250ms. On power-down, once VCC falls below the reset threshold RESET stays LOW and is guaranteed to be 0.4V or less until VCC drops below 1.2V. The reset output on the ASM1832 uses a push-pull drive stage that can maintain a valid output below 1.2V. To sink current with VCC below 1.2V, a resistor can be connected from the reset pin (RESET) to Ground. This configuration will give a valid value on the reset output with VCC approaching 0V. During both power up and down, the configuration will draw current when the RESET is in the high state. The value of 100K Ω should be adequate to maintain a valid condition. The active HIGH reset signal is valid down to a VCC level of 1.2V also. . Application Information Manual Reset Operation Push-button switch input, PBRST, allows the user to override the internal trip point detection circuits and issue reset Microprocessor RESET RESET ASM1832 100kΩ Tolerance Select Tolerance TRIP Point Voltage (V) Min Nom Max TOL = VCC 20% 2.47 2.55 2.64 TOL = GND 10% 2.80 2.88 2.97 ~~ ~~ VOH VOL tRPU RESET RESET VCCTP(MIN) VCCTP(MAX) VCCTP tR VCC Figure 1: Timing Diagram : Power Up ~~ ~~ VOH VOL VCCTP (MAX) VCCTP VCCTP (MIN) RESET RESET tF VCC tRPD Figure 2: Timing Diagram : Power Down |
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