MB89R112 datasheet(9/49 Pages) RAMXEED

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MB89R112

DS411-00004-3v0-E

2. Communication from Transponder to Reader/Writer

• Minimum load modulation amplitude (Vlm) : 10 mV (based on ISO/IEC 10373-7)

• Load modulation subcarrier frequency (fs) : 423.75 kHz(fc/32)

The MB89R112 supports only 1-subcarrier system.

(Not the 2-subcarrier system.)

• Data rate : The MB89R112 supports the following 2 data rate modes :



Low data rate



High data rate

One of the 2 data rate modes is specified by the Data_rate_flag (described later) sent from

the reader/writer. In low data rate mode, the data rate is 6.62 kbps (fc/2048); in high data rate

mode, it is 26.48 kbps (fc/512).

When receiving the Fast commands (Custom commands) , the communication starts from

the transponder with the data rate that is twice as fast as normal data rate. In this case, the

2 data rate modes of low data rate and high data rate specified by the Data_rate_flag is

supported. In Low data rate mode, the data rate is 13.24 kbps (fc/1024) ; in high data rate

mode, it is 52.97 kbps (fc/256) .

(1) Bit coding

The Manchester coding is used for the bit coding. The following figures show the signals modulated in high

data rate mode when ISO command is received and the same signals when fast command is received. In

low data rate mode of both ISO commands and fast commands, the number of pulses for subcarrier and

data transfer time are 4 times as large as the number in high data rate mode.

37.76

μs

37.76

μs



Logic 0



Logic 1

423.75 kHz subcarrier

18.88 s (modulated)

18.88 s

(not modulated)

423.75 kHz subcarrier

18.88 s

(not modulated)

18.88 s (modulated)



Signal waveforms by load modulation in high data rate mode (ISO commands)

18.88

μs

9.44

μs

9.44

μs

18.88

μs

9.44

μs

9.44

μs



Logic 0



Logic 1



Signal waveforms by load modulation in high data rate response mode (fast commands)

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