RX95HF Datasheet, PDF (15/44 Pages) STMicroelectronics – Near field communication transceiver for tag emulation

RX95HF
Commands
5.3
IDN command (0x01) description
The IDN command (0x01) gives brief information about the RX95HF and its revision.
Direction
Data
Table 7. IDN command description
Comments
Example
Host to
RX95HF
0x01
0x00
Command code
Length of data
>>>0x0100
0x00
<Len>
Result code
Length of data
<<<0x000F4E4643204653324A415354
34002ACE
RX95HF to
Host
Data in ASCII format (13
<Device ID> _bytes)
<ROM CRC>
CRC calculated for ROM
content (2 bytes)
In this example,
<<<0x4E4643204653324A4153543400
: ‘NFC FS2JAST4’, #4 (Last Character of
NFC FS2JAST4 means ROM code
revision 4.)
0x2ACE: CRC of ROM (real CRC may
differ from this example)
It takes approximately 6 ms to calculate the CRC for the entire ROM. The application must
allow sufficient time for waiting for a response for this command.
5.4
Protocol Select command (0x02) description
This command selects the RF communication protocol and prepares the RX95HF for
communication with a reader.
Direction
Table 8. PROTOCOLSELECT command description
Data
Comments
Example
0x02
Command code
Host to
RX95HF
<Len>
<Protocol>
Length of data
Protocol codes:
12: ISO/IEC 14443-A
See Table 9: List of <Parameters>
values for different protocols (Tag
Emulation) for a detailed example.
Each protocol has a
<Parameters> different set of
>>>0x02021208
parameters. See Table 9.
RX95HF to ^0x00
Host
0x00
Result code
Length of data
<<<0x0000
Protocol is successfully selected
RX95HF to ^0x82
Host
0x00
Error code
Length of data
<<<0x8200
Invalid command length
RX95HF to ^0x83
Host
0x00
Error code
Length of data
<<<0x8300
Invalid protocol
When the application selects a protocol, the RX95HF performs all necessary settings: it will
choose the appropriate reception and transmission chains.
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