Melexis MLX90130, Manual

Page: 24 / 37

MLX90130
13.56MHz RFID Transceiver
3901090130 Page 24 of 37 Jan-2014
Rev. 004
The content of the register ARC_B is shown in Table 20 below with the default values in Table 21 :
ARC_B register of the MLX90130
A
Register Bit Function
69 ARC_B
7:4 ModIdx
(1)
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%
3:0 Rx Gain
(2)
Reception chain amplifier Gain:
Code 0 = 34dB
Code 1 = 32dB
Code 3 = 27dB
Code 7 = 20dB
Code F = 8dB
Table 20: Register ARC_B description
(1) Characterized using ISO/IEC10373-6 setup and DVK90130 antenna matching
(2) Defined by design simulations
Communication protocol Default value
ISO/IEC14443 Type A 0xDF
ISO/IEC14443 Type B 0x20
ISO/IEC 15693 – 10% 0x53
ISO/IEC15693 – 100% 0xD3
Table 21: Default value of ARC_B per protocol (Reader mode)
7.1.2 Example how to read back WUFlags content
WUFlags byte (refer to Table 17) is automatically updated after the MLX90130 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

Read the WUFlags register value: 0x0803620100

MLX90130 reply: 0x0001XX
(1)
(1)
XX equal the WUFlags register value