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MB89R119B Datasheet(PDF) 11 Page - RAMXEED LIMITED

Part # MB89R119B
Description  FeRAM Embedded High-speed RFID LSI
PDF  46 Pages
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Manufacturer  RAMXEED [RAMXEED LIMITED]
Direct Link  https://www.ramxeed.com/
Logo RAMXEED - RAMXEED LIMITED

MB89R119B Datasheet(HTML) 11 Page - RAMXEED LIMITED

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MB89R119B
DS411-00002-4v0-E
11
2. Communications Signal Interface 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 MB89R119B supports only a 1-subcarrier system.
(Not supports 2-subcarrier system.)
• Data rate : The MB89R119B 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 (bit 2) (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 in the data rate that is twice as fast as normal data rate. In this case, the Fast
commands (Custom commands) supports the 2 data rate modes specified by the Data_rate_
flag (bit 2). 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)
2-1.Bit coding
The Manchester coding is used for the bit coding. The following figure shows the signals modulated in
high
data rate mode when ISO command is received, and the next following figure shows the same signals
when fast command is received. For the low data rate, both ISO command and fast command, the same
subcarrier frequency is used, in this case the number of pulse and the timing shall be multiplied by 4.
37.76
μs
37.76
μs
423.75 kHz subcarrier
423.75 kHz subcarrier
18.88
μs (modulated)
18.88
μs
(not modulated)
18.88
μs (modulated)
18.88
μs
(not modulated)
Logic 0
Logic 1
Signal waveforms by load modulation in high data rate mode (ISO commands)
18.88
ms
9.44
ms
(modulated)
18.88
ms
9.44
ms
(not modulated)
9.44
ms
(not modulated)
9.44
ms
(modulated)
Logic 0
Logic 1
Signal waveforms by load modulation in high data rate response mode (fast commands)



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