MLX90111 Просмотр технического описания (PDF) - Melexis Microelectronic Systems

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MLX90111

128bit Read Write Transponder

Melexis Microelectronic Systems  

MLX90111

128bit Read Write Transponder

Manchester Code

X Binary Data 1 1 1 1 0 1 0 1 1 0 0

Memory Output

Modulation Output

Biphase Code

X Binary Data 0 1 1 0 1 0 0 1 1 0 0

Memory Output

Modulation Output

Return to One

X Binary Data 1 1 1 1 0 1 0 1 1 0 0

Binary form

Modulation Output

Coding schemes

Manchester

For a “1” bit, there is a transition from 0 to 1 in

the middle of the bit period. Reciprocal, for a “0”

logic bit there is a transition from 1 to 0 in the

middle of the bit period.

Biphase

At the beginning of each bit, a transition will

occur. A logic bit “1” will keep its state for the

whole bit duration and a logic bit “0” will show a

transition in the middle of the bit duration.

Return to One

This encoding is used to modulate the reader

antenna to send the commands to the

transponder.

For a “0” bit, there is a transition to 0 in the

beginning of the bit period. In the middle of the

bit period the state returns to 1.

For a “1” bit, the level remains high for the entire

bit period.

Flow Chart.

Upon entering the RF field, the transponder

"sees" increasing amplitude of the voltage

between COIL and GND pins. It passes through

a POR sequence, and enters the normal read

mode, transmitting the ID continuously.

If the reader sends an asynchronous control

pattern (ACP), the transponder enters program

mode. It receives an address, parity, a 16-bit

data word and a CRC.

When a write command has been successfully

received, the word is stored at the given

address. When a word of the ID is written, the

critical read flag will be set. This flag can only

be reset by removing the transponder from the

electromagnetic field.

When a read command for addresses #B

(WPW) or #C (tune-bits, speed and code) has

successfully been received, the transponder

immediately sends back the requested

information, once critical high and once critical

low.

If no new programming pattern is received

during the Watchdog Delay period (TWD), the

transponder checks the critical read flag and

enters the appropriate read mode.

MLX90111 128bit Read Write Transponder Page 10 of 12

Rev 1.12 5-Feb-01

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