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NCV8508PD50 Datasheet(PDF) 9 Page - ON Semiconductor |
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NCV8508PD50 Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 26 page NCV8508 http://onsemi.com 9 CIRCUIT DESCRIPTION Functional Description To reduce the drain on the battery, a system can go into a low current consumption mode whenever it is not performing a main routine. The Wakeup signal is generated continuously and is used to interrupt a microcontroller that is in sleep mode. The nominal output is a 5.0 volt square wave (voltage generated from VOUT) with a duty cycle of 50% at a frequency that is determined by a timing resistor, RDelay. When the microprocessor receives a rising edge from the Wakeup output, it must issue a Watchdog pulse and check its inputs to decide if it should resume normal operations or remain in the sleep mode. The first falling edge of the Watchdog signal causes the Wakeup to go low within 2.0 ms (typ) and remain low until the next Wakeup cycle (see Figure 17). Other Watchdog pulses received within the same cycle are ignored (Figure 3). During power up, RESET is held low until the output voltage is in regulation. During operation, if the output voltage shifts below the regulation limits, the RESET toggles low and remains low until proper output voltage regulation is restored. After the RESET delay, RESET returns high. The Watchdog circuitry continuously monitors the input Watchdog signal (WDI) from the microprocessor. The absence of a falling edge on the Watchdog input during one Wakeup cycle will cause a RESET pulse to occur at the end of the Wakeup cycle. (see Figure 4). The Wakeup output is pulled low during a RESET regardless of the cause of the RESET. After the RESET returns high, the Wakeup cycle begins again (see Figure 4). The RESET Delay Time, Wakeup signal frequency and RESET high to Wakeup delay time are all set by one external resistor RDelay. Wakeup Period = (4.17 × 10-7)RDelay RESET Delay Time = (5.21 × 10-8)RDelay RESET HIGH to Wakeup Delay Time = (2.08 × 10-7)RDelay Resistor temperature coefficient and tolerance as well as the tolerance of the NCV8508 must be taken into account in order to get the correct system tolerance for each parameter. Figure 17. Wakeup Response to WDI Wakeup WDI Wakeup Response to WDI Figure 18. Wakeup Response to RESET (Low Voltage) Wakeup Response to RESET RESET Wakeup |
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