MLX90121 データシートの表示（PDF） - Melexis Microelectronic Systems

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コンポーネント説明

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MLX90121

13.56MHz RFID Transceiver

Melexis Microelectronic Systems  

MLX90121

13.56MHz RFID Transceiver

11. Operating Modes

11.1. Definitions

There are two main operating modes:

• MODE = 0

: Configuration Mode

• MODE = 1

: Communication Mode

The configuration mode allows writing in the configuration registers. It will configure all parameters in the

transceiver.

The communication mode allows communicating with a transponder. Different options are available:

• Direct transmission: The transmission protocol is handled by an external microcontroller.

• Hardware transmission: The low level protocol is handled by an internal programmable encoder. It

allows using a low cost microcontroller.

• Direct reception: The reception protocol is handled by an external microcontroller.

• Hardware reception: FSK/PSK decoders and Majority Voting can be enabled to allow using a low

cost microcontroller.

11.2. Configuration Mode

Registers Addresses

For configuration purposes, users have access to 13 eight bit registers, which can be addressed using a 4

bit address.

Address

0

1

2

3

4

5

6

7

8

9

10

11

12

Register name

AnalogConfig

PowerState

Reserved (*)

DigitalConfig

EncoderSym0

EncoderSym1

EncoderSym2

EncoderSym3

EncoderSym4

EncoderSym5

EncoderTimeRef

DecoderTimeRef

LTC

(*) the reserved register is for manufacturing purpose only and should not be used.

Write Configuration Registers

First the MODE line is asserted low to enable the configuration mode. Then data is fed serially into the

chip with the CK and DIN lines. Data on the DIN line is read on the rising edge of CK. The first four bits on

DIN are the register address and the eight following bits are the data. Address and data fields are written

MSB (Most Significant Bit) first.

3901090121

Rev. 009

Page 9 of 26

Data Sheet

Sept.-2009

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