MLX90132 Datasheet, PDF(31/44 Page) Melexis Microelectronic Systems

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MLX90132 Datasheet, PDF (31/44 Pages) Melexis Microelectronic Systems – 13.56MHz RFID / NFC Transceiver

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MLX90132

13.56MHz RFID / NFC Transceiver

The content of the register ARC_B is shown in Table 31 below with the default values in Table 32:

ARC_B register of the MLX90132

Bit

69 ARC_B

7:4 ModIdx(1)

3:0 Rx Gain(2)

Function

ASK Modulation Index :

Code 1 = 10%

Code 2 = 14%

Code 3 = 18%

Code 4 = 21%

Code 5 = 24%

Code 6 = 26%

Code 7 = 30%

Code 8 = 35%

Code 9 = 39%

Code A = 40%

Code B = 43%

Code C = 45%

Code D = 96%

Reception chain amplifier Gain:

Code 0 = 34dB

Code 1 = 32dB

Code 3 = 27dB

Code 7 = 20dB

Code F = 8dB

Table 31: Register ARC_B description

(1) Characterized using ISO/IEC10373-6 setup and DVK90132 antenna matching

(2) Defined by design simulations

Communication protocol

Default value

ISO/IEC14443 Type A

0xDF

ISO/IEC14443 Type B

0x20

ISO/IEC18092 (Felica)

0x50

ISO/IEC 15693 â 10%

0x53

ISO/IEC15693 â 100%

0xD3

Table 32: Default value of ARC_B per protocol (Reader mode)

7.1.2 Example how to read back WUFlags content

WUFlags byte (refer to Table 24) is automatically updated after the MLX90132 wakes-up from an Idle

command. In SPI mode, this byte is available to read in the FIFO register. In UART mode, this byte is

asynchronously sent after wake-up. In some cases, it is useful to be able to check the WUFlags separately;

the example below shows how to do it:

Read WUFlags register value

ï· Read the WUFlags register value:

ï· MLX90132 reply:

(1) XX equal the WUFlags register value

0x0803620100

0x0001XX(1)

3901090132

Rev. 009

Page 31 of 44

Jan-2014

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