MLX90132 Datasheet, PDF (28/44 Pages) Melexis Microelectronic Systems – 13.56MHz RFID / NFC Transceiver

MLX90132
13.56MHz RFID / NFC Transceiver
6.10 BaudRate command (0x0A)
This command is used to change the UART baud rate.
Set UART baud rate 0x0A
Direction
Data
0A
01
MCU – device
<BR_Ratio>
Comments
Command code
Length of data
New BR ratio = <BR_Ratio>*2+2
See following table:
Baud rate ratio
255 – 13.56/512 ~26.48kbps
254 – 13.56/510 ~26.59kbps
253 – 13.56/508 ~26.7kbps
...
117 – 13.56/236 ~57.7kbps (default value)
...
2 – 13.56/6 ~2.26Mbps
1:0 – Not used
Example
Device - MCU 55
“Echo” code of 0x55
55 - New baud rate is used to reply
Table 26: “Baudrate” command description
6.11 SubFreqRes command (0x0B)
This command returns the last sub-carrier frequency measured during communication. It is used to measure
the data-rate for protocols ISO/IEC18092 (212,424Kbps) / NFC-F. Please note that this operation is
automatically performed by the MLX90132 when configured in Tag emulation mode, ISO/IEC18092 & NFC-F.
SubFreqRes0x0B
Direction
Data
MCU – device
0B
00
00
01
Device - MCU
<FreqSc_Ratio>
Comments
Command code
Length of data
Result code
Length of data
Ratio of measured sub-carrier
frequency, refer to
Equation 4
Example
0B00
00010F - Here 0F is a frequency divider. Use
this value to configure the MLX90132
Table 27: “SubFreqRes” command description
SubFreqRes reports the frequency divider. To calculate the real frequency use this formula
Equation 4: Byte FreqSc_Ratio calculation:
(
)
3901090132
Rev. 009
Page 28 of 44
Jan-2014