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ST25DV16K 데이터시트(PDF) 23 Page - STMicroelectronics

부품명 ST25DV16K
상세설명  Dynamic NFC/RFID tag IC with 4-Kbit, 16-Kbit or 64-Kbit EEPROM,and fast transfer mode capability
PDF  220 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25DV16K 데이터시트(HTML) 23 Page - STMicroelectronics

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ST25DV04K ST25DV16K ST25DV64K
Power management
219
t_boot time necessary to ST25DVxxx set-up has passed. In the version supporting LPD pin,
the boot will take place only when LPD goes low.
In a similar way, during power-down (continuous decrease in VCC), as soon as VCC drops
below the power-on reset threshold voltage, the device stops responding to any instruction
sent to it, and I2C address counter is reset.
Power-down mode
During power-down (continuous decay of VCC), the device must be in Standby power mode
(mode reached after decoding a Stop condition, assuming that there is no internal write
cycle in progress).
3.2
Contactless interface
Device set in RF mode
To ensure a proper boot of the RF circuitry, the RF field must be turned ON without any
modulation for a minimum period of time tRF_ON. Before this time, ST25DVxxx will ignore all
received RF commands. (See Figure 6: ST25DVxxx RF Power Up sequence (No DC
supply)).
Device reset in RF mode
To ensure a proper reset of the RF circuitry, the RF field must be turned off (100%
modulation) for a minimum tRF_OFF period of time.
The RF access can be temporarily or indefinitely disabled by setting the appropriate value in
the RF disable register.
Figure 6. ST25DVxxx RF Power Up sequence (No DC supply)



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