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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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ST95HF Datasheet(PDF) 13 Page - STMicroelectronics |
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ST95HF Datasheet(HTML) 13 Page - STMicroelectronics |
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13 / 93 page  DocID025630 Rev 4 13/93 ST95HF Power management and operating modes 92 3.2 Startup sequence After the power supply is established at power-on, the ST95HF waits for a low pulse on the pin IRQ_IN (t1) before automatically selecting the external interface (SPI) and entering Ready state after a delay (t3). 1. Note for pin SSI0: - - - SPI selected 2. Pin IRQ_IN low level < 0.2 VPS_Main. Note: When ST95HF leaves WFE mode (from Power-up, Hibernate, Tag Detector, or Sleep/Field Detector) following an IRQ_IN low level pulse. Figure 4. ST95HF initialization and operating state change Supply off PowerUP Tag Detector Sleep / Field Detector Hibernate WAIT FOR EVENT READY Reader Card Emulation ACTIVE Protocol Select cde Serial I/F selection IDLE cde Wake UP Protocol Select cde Figure 5. Power-up sequence |
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