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ST95HF Datasheet(PDF) 14 Page - STMicroelectronics |
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ST95HF Datasheet(HTML) 14 Page - STMicroelectronics |
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14 / 93 page  Power management and operating modes ST95HF 14/93 DocID025630 Rev 4 Figure 5 shows the power-up sequence for a ST95HF device; where, • t0 is the initial wake-up delay 100 µs (minimum) • t1 is the minimum interrupt width 10 µs (minimum) • t2 is the delay for the serial interface selection 250 ns (typical) • t3 is the HFO setup time (tSU(HFO)) 10 ms (maximum) • t4 is the VPS ramp-up time from 0V to VPS 10 ms (max. by design validation) Note: VPS must be 0V before executing the start-up sequence. The serial interface is selected after the following falling edge of pin IRQ_IN when leaving from POR or Hibernate state. Table 4 lists the signal configuration used to select the serial communication interface. Table 4. Select serial communication interface selection table Pin Serial interface SSI_0 SPI: 1 SSI_1 SPI: 0 |
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