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ST25R95 Datasheet(PDF) 7 Page - STMicroelectronics

Part # ST25R95
Description  Near field communication transceiver
PDF  61 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25R95 Datasheet(HTML) 7 Page - STMicroelectronics

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Figure 4. ST25R95 initialization and operating state change
ACTIVE
IDLE
command
Wake-up
Protocol
Select code
Card Emulator
READY
Protocol
Select code
Reader
WAIT FOR EVENT
Power-up
Sleep / Field detector
Tag detector
Hibernate
Supply off
Serial I/F
selection
3.2
Startup sequence
After the power supply is established at power-on, the ST25R95 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).
Figure 5. Power-up sequence
VPS
IRQ_IN
First valid command
SSI_1
SSI_0
t4
0 V
t0
t1
t2
t3
1.
Pin IRQ_IN low level < 0.2 VPS_Main.
ST25R95
Startup sequence
DS12807 - Rev 4
page 7/61



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