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ST25DV04K Datasheet(PDF) 75 Page - STMicroelectronics |
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ST25DV04K Datasheet(HTML) 75 Page - STMicroelectronics |
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75 / 200 page  7.4 RF protocol description 7.4.1 Protocol description The transmission protocol (or simply “the protocol”) defines the mechanism used to exchange instructions and data between the VCD (Vicinity Coupling Device) and the ST25DVxxx in both directions. It is based on the concept of “VCD talks first”. This means that a ST25DVxxx does not start transmitting unless it has received and properly decoded an instruction sent by the VCD. The protocol is based on an exchange of: • a request from the VCD to the ST25DVxxx, • a response from the ST25DVxxx to the VCD. Each request and each response are contained in a frame. The frame are delimited by a Start of Frame (SOF) and End of Frame (EOF). The protocol is bit-oriented. The number of bits transmitted in a frame is a multiple of eight (8), that is an integer number of bytes. A single-byte field is transmitted least significant bit (LSBit) first. A multiple-byte field is transmitted least significant byte (LSByte) first and each byte is transmitted least significant bit (LSBit) first. Figure 32. ST25DVxxx protocol timing Request frame Request frame Response frame Response frame VCD ST25DVxxx Timing t1 t2 t1 t2 7.4.2 ST25DVxxx states referring to RF protocol The ST25DVxxx can be in one of four states: • Power-off • Ready • Quiet • Selected Transitions between these states are specified in Figure 33. ST25DVxxx state transition diagram and Table 92. ST25DVxxx response depending on Request_flags. Power-off state The ST25DVxxx is in the Power-off state when it does not receive enough energy from the VCD. Ready state The ST25DVxxx is in the Ready state when it receives enough energy from the VCD. When in the Ready state, the ST25DVxxx answers any request where the Select_flag is not set. ST25DV04K ST25DV16K ST25DV64K RF protocol description DS10925 - Rev 9 page 75/200 |
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