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AAT3532 Datasheet(PDF) 5 Page - Advanced Analogic Technologies |
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AAT3532 Datasheet(HTML) 5 Page - Advanced Analogic Technologies |
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5 / 8 page  AAT3532 MicroPower™ Microprocessor Reset Circuit 3532.2001.11.0.9 5 Applications Information Power Monitor The reset function monitors the VCC supply to ensure a microprocessor is correctly reset and is powered up into a known condition following a power supply failure. RST and RST will remain valid for Vcc volt- ages down to 1.4V. The RST and RST pins are asserted whenever VCC drops below the reset threshold voltage. This volt- age can be set by programming the TOL pin. Connecting TOL to VCC sets the 10% tolerance of the VCC supply (typically 4.37V for VCC = 5V). Connecting TOL to GND sets the 5% tolerance of the VCC supply (typically 4.62V for VCC = 5V). The reset pin is guaranteed to remain asserted for a minimum period of 250ms after VCC has risen above the reset threshold voltage. RST output is an open drain output. For correct operation, a pull-up resistor of 10k Ω should be con- nected between this output and VCC. Functional Block Diagram Watchdog Timer Detector De-Bounce Circuit Watchdog Timer Reset Generator VCC Tolerance Select VCC TOL TD ST PBRST GND RST RST VREF Figure 1. Reset Output Delay VCC tRPU tRPD RST RST +5V +4.75V (5% Trip Point) +4.50V (10% Trip Point) RESET output delay (VCC Falling) RESET output delay (VCC Rising) 0V |
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