RX95HF Datasheet, PDF (20/44 Pages) STMicroelectronics – Near field communication transceiver for tag emulation

Commands
RX95HF
Protocol
Table 16. Format of data to be sent using SEND command
Explanation
Response example
Comments
ISO/IEC-
14443
Type A
Send example 06 03 0400 08
Command code
Length of entire data field
Data
Parameter:
7:6: RFU
5: Append CRC
4: RFU (Do not append parity)
3:0: Number of significant bits in first
byte
>>>0x0603040008
5.8
Idle command (0x07) description
This command switches the RX95HF into low consumption mode and defines the way to
return to Ready state.
The Result code contains the Wake-up flag register value indicating to the application the
wake-up event that caused the device to exit WFE mode.
Direction
Host to
RX95HF
RX95HF to
Host
Table 17. IDLE command description
Data
Comments
Example
07
0E
<WU Source>
EnterCtrlL
EnterCtrlH
WUCtrlL
WUCtrlH
LeaveCtrlL
LeaveCtrlH
0x00
0x01
<Data>
Command code
Length of data
Specifies authorized wake-
up sources and the LFO
frequency
Example of switch from Active
mode to Hibernate state (wake-up
by low pulse on IRQ_IN pin):
>>>0x07 0E 08 04 00 04 00
18 00 00 00 00 00 00 00 00
Settings to enter WFE
Example of switch from Active to
mode: 0x0400, 0x0100 or WFE mode (Sleep) (wake-up by
0x0142
low pulse on IRQ_IN pin):
Settings to wake-up from
WFE mode: 0x0400 or
0x3800
Settings to leave WFE
mode (Default value =
0x1800)
>>>0x07 0E 08 01 00 38 00
18 00 00 60 00 00 00 00 00
Example of switch from Active
mode to WFE mode (Field
Detector) with wake-up by Field
Detection:
>>> 0x07 0E 04 01 42 38 00
18 00 00 60 00 00 00 00
Result code
Length of data
Data (Wake-up source):
0x04: Field detect
0x08: Low pulse on
IRQ_IN pin
This response is sent only when
RX95HF exits WFE mode.
<<<0x000104 Wake-up by field
detect
<<<0x000108 Wake-up by low
pulse on IRQ_IN pin
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