MLX90110 Datasheet, PDF (7/10 Pages) List of Unclassifed Manufacturers – 128bit OTP/RW Transponder

MLX90110
128bit OTP/RW Transponder
3 Timing specification
3.1 Asynchronous Control Pattern
The ACP is a pattern send by the reader to the
transponder without any synchronization. It
signals the transponder to stop transmitting and
listen for a programming sequence.
The control pattern is based on the detection of
4 transitions between high field strength (FHIGH
or Vacprh) and low field strength (FLOW or
Vacprl). After the control pattern has been
successfully detected, the transponder stops
modulating.
Before starting the ACP, the field must be stable
at FHIGH for at least 2 bit periods (Tas).
Right after the last ACP transition, there is an
additional delay equal to Tas before the
transponder resets the watchdog counter (TWD).
During this delay the Field can be put back to
high to optimise operating distance.
The transponder samples the field strength once
per bit. An edge will be detected correctly if the
tag has sampled at least 2 consecutive values
on one level, and then at least 2 values at the
other level. Therefore, Tas should be longer
than 2 bit, to guarantee that the transition will be
correctly detected. The four transitions should
be completed in timeout of 16 periods (TACP).
If the startbit is not detected within 16 periods
(TWD) after TACP a time out will occur. See
operating modes to see correct flow at time out.
3.2 Other timings
The startbit is followed by a 16bit word, which
will be programmed at the address defined by
the address counter. This counter is reset when
the ACP is received. It increments after each
new word.
The other timings can be calculated based on
the formulas below.
Data send to transponder
TACP
TWD
SB
≤16
≤16
1
Transponder mode/operations
Normal
Read
Stop
Start bit
modultion _detection
Treceive
16
Terase
16
RECEIVE ERASE
DATA WORD
Twrite
16
WRITE
WORD
TWD
≤16
Watchdog
time out
SB Treceive Terase Twrite
1
16
16
16
New RECEIVE WRITE ERASE
startbit _{DATA WORD WORD}
MLX90110 Timing Specifications (carrier: Freq=125kHz, Tclk=8µs)
Speed
Bit period
TWD / Tsend Terase/ Twrite
Freq/64 (2kbaud)
Freq/32 (4kbaud)
Tclk
0.512ms
0.256ms
Tclk*1024
8.912ms
4.096ms
Tclk*1024
8.912ms
4.096ms
FHIGH
FLOW
Tas
ACP pattern
Tas
Tas
Tas
Tas
Twd
start bit
MLX90110 128bit MTP Transponder
Page 7 of 10
Rev 1.14 1-Dec-2000