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CS8101YD8G データシート(PDF) 6 Page - ON Semiconductor |
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CS8101YD8G データシート(HTML) 6 Page - ON Semiconductor |
6 / 11 page CS8101 http://onsemi.com 6 The RESET output is an open collector NPN transistor, controlled by a low voltage detection circuit. The circuit is functionally independent of the rest of the IC thereby guaranteeing that the RESET signal is valid for VOUT as low as 1.0 V. Figure 5. RC Network for RESET Delay VOUT CS8101 5.0 V to mP and System Power RESET RRST to mP RESET Port CRST COUT An external RC network on the lead (Figure 5) provides a sufficiently long delay for most microprocessor based applications. RC values can be chosen using the following formula: RTOTCRST + −tDelay ln VT*VOUT VRST*VOUT where: RRST = RESET Delay resistor RIN = mP port impedance RTOT = RRST in parallel with RIN CRST = RESET Delay capacitor tDelay = desired delay time VRST = VSAT of RESET lead (0.7 V @ turn − ON) VT = RESET threshold. The circuit depicted in Figure 6 lets the microprocessor control its power source, the CS8101 regulator. An I/O port on the mP and the SWITCH port are used to drive the base of Q1. When Q1 is driven into saturation, the voltage on the ENABLE lead falls below its lower threshold. The regulator’s output is enabled. When the drive current is removed, the voltage on the ENABLE lead rises, the output is switched off and the IC moves into Sleep mode where it draws 50 mA (max). By coupling these two controls with the ENABLE lead, the system has added flexibility. Once the system is running, the state of the SWITCH is irrelevant as long as the I/O port continues to drive Q1. The microprocessor can turn off its own power by withdrawing drive current, once the SWITCH is open. This software control at the I/O port allows the microprocessor to finish key housekeeping functions before power is removed. The logic options are summarized in Table 1. Table 1. Logic Control of CS8101 Output Microprocessor I/O Drive Switch ENABLE Output ON Closed LOW ON Open LOW ON OFF Closed LOW ON Open HIGH OFF The I/O port of the microprocessor typically provides 50 mA to Q1. In automotive applications the SWITCH is connected to the ignition switch. |
同様の部品番号 - CS8101YD8G |
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同様の説明 - CS8101YD8G |
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