RX95HF Datasheet, PDF (10/44 Pages) STMicroelectronics – Near field communication transceiver for tag emulation

Power management and operating modes
RX95HF
Note:
Figure 5 shows the power-up sequence for a RX95HF device; where,
 t₀ is the initial wake-up delay
 t₁ is the minimum interrupt width
 t₂ is the delay for the serial interface selection
 t₃ is the HFO setup time (t_SU(HFO))
 t₄ is the V_PS ramp-up time from 0V to VPS
100 μs (minimum)
10 μs (minimum)
250 ns (typical)
10 ms (maximum)
200 μs (minimum) and
10 ms (max. by design validation)
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.
SSI_0
SSI_1
Table 4. Select serial communication interface selection table
Pin
Serial interface (SPI)
1
0
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