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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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73S8024RN-IL/F датащи(PDF) 12 Page - Maxim Integrated Products |
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73S8024RN-IL/F датащи(HTML) 12 Page - Maxim Integrated Products |
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12 / 27 page  73S8024RN Data Sheet DS_8024RN_020 12 Rev. 2 8 Deactivation Sequence Deactivation is initiated either by the system controller by setting the CMDVCC high, or automatically in the event of hardware faults. Hardware faults are over-current, overheating, VDD fault, VPC fault, VCC fault, and card extraction during the session. To be noted that VPC and VCC faults are linked together so that a fault is generated when VPC goes lower than VCC. The following steps show the deactivation sequence and the timing of the card control signals when the system controller sets the CMDVCC high or OFF goes low due to a fault or card removal: • RST goes low at the end of t1. • CLK is set low at the end of t2. • I/O goes low at the end of t3. Out of reception mode. • VCC is shut down at the end of time t4. After a delay t5 (discharge of the VCC capacitor), VCC is low. RST CLK I/O VCC t1 t2 t3 t4 t5 CMDVCC -- OR -- OFF t1 = > 0.5µs, timing by 1.5MHz internal Oscillator t2 = > 7.5µs t3 = > 0.5µs t4 = > 0.5µs t5 = depends on VCC filter capacitor. For NDS application, CF=1µF makes t1 + t2 + t3 + t4 + t5 < 100µs Figure 4: Deactivation Sequence |
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