CR95HF datasheet(9/63 Pages) STMICROELECTRONICS

Part #	CR95HF

Description	13.56-MHz multi-protocol contactless transceiver IC with SPI and UART serial access

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CR95HF

Power management and operating modes

Doc ID 018669 Rev 8

9/63

3.2

Startup sequence

After the power supply is established at power-on, the CR95HF waits for a low pulse on the

pin IRQ_IN (t1) before automatically selecting the external interface (SPI or UART) and

entering Ready state after a delay (t3).

Figure 5.

Power-up sequence

1.

Note for pin SSI0: - - - SPI selected, –––– UART selected

2.

Pin IRQ_IN low level < 0.2 VPS_Main.

Note:

When CR95HF leaves WFE mode (from Power-up, Hibernate, Sleep or Tag Detector)

following an |RQ_IN/RX low level pulse, this pulse is NOT interpreted as the UART start bit

character.

Figure 4.

CR95HF initialization and operating state change

Supply off

Power-up

POR

Ready

Reader

Tag Detector

(& Calibration )

Sleep

IRQ_IN

Protocol Select

POR sequence

Wake-up event

Hibernate

TimeOut

Tag Detection

Idle command

IRQ_IN

Active

WFE

IRQ_IN

Protocol Select

Serial I/F

selection

SPI

Reset

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