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ST25DV04K Datasheet(PDF) 23 Page - STMicroelectronics |
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ST25DV04K Datasheet(HTML) 23 Page - STMicroelectronics |
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23 / 220 page  DocID027603 Rev 4 23/220 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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