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CS8151 датащи(PDF) 5 Page - Cherry Semiconductor Corporation |
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CS8151 датащи(HTML) 5 Page - Cherry Semiconductor Corporation |
5 / 8 page 5 To reduce the drain on the battery a system can go into a low current consumption mode when ever its not per- forming a main routine. The WAKE UP signal is generated continuously and is used to interrupt a microcontroller that is in sleep mode. The nominal output is a 5 volt square wave with a duty cycle of 50% at a frequency that is determined by a timing capacitor, CDelay. When the microprocessor receives a rising edge from the WAKE UP output, it must issue a watchdog pulse and check its inputs to decide if it should resume normal oper- ations or remain in the sleep mode. The first falling edge of the watchdog signal causes the WAKE UP to go low within 2µs (typ) and remain low until the next WAKE UP cycle (see Figure 2). Other watchdog pulses received within the same cycle are ignored (Figure 1). During power up, is held low until the output volt- age is in regulation. During operation, if the output volt- age shifts below the regulation limits, the RESET toggles low and remains low until proper output voltage regula- tion is restored. After the delay, 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 WAKE UP cycle will cause a pulse to occur at the end of the WAKE UP cycle. (see Figure 1b). The WAKE UP output is pulled low during a regardless of the cause of the . After the returns high, the WAKE UP cycle begins again (see Figures 1b). The pulse width, WAKE UP signal frequency and high to WAKE UP delay time are all set by one external capacitor CDelay. WAKE UP period=(4x105)CDelay Delay Time=(5x104)CDelay HIGH to WAKE UP Delay Time =(2x105)CDelay Capacitor temperature coefficient and tolerance as well as the tolerance of the CS8151 must be taken into account in order to get the correct system tolerance for each parameter. Figure 2. WAKE UP response to WDI Figure 3. WAKE UP response to (Low Voltage) RESET WAKE UP Response to ______ RESET ______ RESET WAKE UP WAKE UP Response to WDI WAKE UP WDI RESET RESET RESET RESET RESET RESET RESET RESET RESET RESET RESET Dropout Voltage: The input-output voltage differential at which the cir- cuit ceases to regulate against further reduction in input voltage. Measured when the output voltage has dropped 100mV from the nominal value obtained at 14V input, dropout voltage is dependent upon load current and junction temperature. Input Voltage: The DC voltage applied to the input terminals with respect to ground. Line Regulation: The change in output voltage for a change in the input voltage. The measurement is made under con- ditions of low dissipation or by using pulse tech- niques such that the average chip temperature is not significantly affected. Load Regulation: The change in output voltage for a change in load current at constant chip temperature. Quiescent Current: The part of the positive input current that does not contribute to the positive load current. The regulator ground lead current. Ripple Rejection: The ratio of the peak-to-peak input ripple voltage to the peak-to-peak output ripple voltage. Current Limit: Peak current that can be delivered to the output. Definition of Terms Circuit Description Functional Description |
Аналогичный номер детали - CS8151 |
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Аналогичное описание - CS8151 |
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