MB89R112 datasheet(10/49 Pages) RAMXEED

10 / 49 page

MB89R112

DS411-00004-3v0-E

(2) Data frame

A data frame sent from a transponder starts with a start of frame (SOF) signal and ends with an end of frame

(EOF) signal. The following figures show the SOF and EOF signals sent in high data rate mode when an

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

of both ISO commands and fast commands, the number of pulses in subcarrier and data transfer time are

4 times as large as the number in high data rate mode. The reader/writer shall be ready to receive a frame

from the transponder within 300 s after having sent a frame to the transponder.

3. FeRAM Data Protection if Power Lost During Data Writing

MB89R112 accesses to FeRAM with the unit of 2 bytes. When RF power is shut down during accessing

FeRAM, writing in FeRAM is completed by the charges stored in a smoothing capacitor on the LSI and

FeRAM data writing error is prevented.

Therefore, the commands of 1 byte access such as WriteAFI, Write DSFID and Lock command are protected

from the power down.

On the other hand, the commands of more than 2 bytes access such as Write Single Block command may

not protect all the data from the power down during the access. In this case, it is recommended to confirm

the data correctness by a read command.

56.64

μs

37.76

μs

56.64

μs

56.64

μs

56.64

μs

37.76

μs

423.75 kHz subcarrier



SOF



EOF



Waveforms of SOF and EOF signals of a frame sent from a transponder (ISO commands)

28.32

μs

28.32

μs

28.32

μs

28.32

μs

18.88

μs

18.88

μs

423.75 kHz

Subcarrier

423.75 kHz

Subcarrier



SOF



EOF



Waveforms of SOF and EOF signals of a frame sent from a transponder (fast commands)

MB89R112 датащи(PDF) 10 Page - RAMXEED LIMITED

MB89R112 датащи(HTML) 10 Page - RAMXEED LIMITED

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

датащи скачать

ссылки URL