MLX90110 Datasheet, PDF (5/10 Pages) List of Unclassifed Manufacturers – 128bit OTP/RW Transponder

MLX90110
128bit OTP/RW Transponder
EEPROM Memory organization
The EEPROM memory is arranged as 9 words
of 16 bits each (see memory map above). Each
one of these words is individually programmable.
IDENTIFICATION WORDS (Addresses #0 to #7)
The first 8 words hold the 128bits identification
code (ID).
CONFIGURATION WORD (Address #8)
The 9^th word contains:
• SPEED (bit 0:LSB)
Speed bit defines the internal clock
extraction: set to 1 for divided by 32, set to 0
for divided by 64.
• CODE (bit 1)
Code bit defines if the ID will be encoded in
Manchester (set to 1) or Biphase (set to 0)
amplitude modulation scheme.
• WP (bit 2)
The Write Protect bit locks the complete
EEPROM, including the configuration bits
(SPEED, CODE). See Read Only Operating
Mode
• RW (bit 3)
The Read Write bit locks only the first 4
words, and write access is password
protected. See Protect Write Operating
Mode. If WP=1, the value is not relevant
(don't care).
• All remaining bits are not used (don't care).
SPEED
0
1
CLOCK
Freq/64
Freq/32
BAUD RATE
2kbaud
4kbaud
CODE
0
1
ENCODING
Biphase
Manchester
OPERATING MODES
After Power up reset (POR) the device starts to
amplitude modulate (AM) the electro magnetic
field. The modulation sequence is based on the
data stored in the EEPROM, using normal
EEPROM read out levels (compared with critical
read mode below).
The behavior of the transponder is fixed at POR,
depending on the options set in the configuration
word. To change this behavior the configuration
word has to be rewritten, and the tag has to be
removed from the field to allow a new POR
sequence.
Depending on the configuration bits WP and RW
3 basic operating modes are possible:
OPERATING MODE
Unprotected Write
Protected Write
Read Only
WP RW
00
01
1x
Write Modes (WP=0)
When the Write Protect bit has not yet been set
(WP=0), the MLX90110 will stop modulating and
enter the program mode when the external field
is Amplitude Modulated with an Asynchronous
Control Pattern (ACP, specified below).
PROGRAM MODE:
When the MLX90110 has detected an ACP the
address counter is reset (=0), and the
transponder waits for a start bit (SB) during a
Watchdog Delay period (TWD) to synchronize
with the rest of the data stream.
The data are not encoded: a field strength higher
than Vacprh is interpreted as a 1, and below
Vacprl as a 0.
Each programmation cycle consists of a SB and
the 16bit data, which are sent by the reader, and
a fixed time to allow the transponder to erase
and write the EEPROM word. During this time,
the field must be at Vacprh to guarantee a good
quality of programmation. The next address is
calculated by incrementing the address counter,
and the next programmation cycle can follow.
Until the ninth word has been received the
transponder resets the watchdog after each
programmation cycle, and waits for the next SB
to resynchronize. After receiving the ninth word,
the transponder leaves the program mode.
It is possible to leave the program mode before,
when a time out occurs whilst waiting for the SB.
MLX90110 128bit MTP Transponder
Page 5 of 10
Rev 1.14 1-Dec-2000