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EM4169B5WS11

128 bit Read/Write Contactless Identification Device with OTP function

EM Microelectronic - MARIN SA 

EM4069

EM4169

ROM organization

The ROM is composed of 64 bits divided in a 9-bit header, 10 nibbles of 4 data bits and 1 row even parity bit, 4 column even

parity bits, and 1 stop bit. The Read ROM command will output the contents of the ROM, starting with bit-0. When bit-64 is

output, the sequence continues with bit-0.

Data in ROM is written by laser programming during manufacturing to form a unique identification code.

Figure below presents the ROM data structure. Bits P0 to P9 are row parity bits and bits PC0 to PC3 are column parity bits.

Parity is even so that a 9 bits set to logic one header can not be reproduced in a data stream.

Bit 0

1

1

1

1

1

1

1

1

Bit 9 D00 D01 D02 D03

Bit 14 D10 D11 D12 D13

Bit 19 D20 D21 D22 D23

Bit 24 D30 D31 D32 D33

Bit 29 D40 D41 D42 D43

Bit 34 D50 D51 D52 D53

Bit 39 D60 D61 D62 D63

Bit 44 D70 D71 D72 D73

Bit 49 D80 D81 D82 D83

Bit 54 D90 D91 D92 D93

Bit 59 PC0 PC1 PC2 PC3

Customer ID for all standard versions is 01 hex.

1 Bit 8

P0 Bit 13

P1 Bit 18

P2 Bit 23

P3 Bit 28

P4 Bit 33

P5 Bit 38

P6 Bit 43

P7 Bit 48

P8 Bit 53

P9 Bit 58

0 Bit 63

Header

8 bits customer ID

Unique

device

serial

number

Column parity bits

Fig. 8

Command description

The EM4069 operates in different modes. The default following a Power on Reset is Read EEPROM mode, and by means of

different commands, the circuit can switch to the following modes :

read access to ROM

write access to 16 bits of EEPROM

write access to configuration word

read access to configuration word

The reader has to generate the commands, which have to be decoded by the EM4069.

Command

Command

Short name

Bit pattern

Function

Command 1

rst

1010 0000

Reset and return to EEPROM read

Command 2

rROM

1010 0101

READ 64 bit ROM

Command 3

wr

1100.add.data.crc WRITE 16 bit EEPROM word

Command 4

wcw

1101 0011.prot.crc WRITE configuration word

Command 5

rcw

1111 0000

Read configuration word

Commands rst, rROM and rcw affect readout. An eight-bit pattern has to be sent to execute them. Write commands are longer

since associated address and data have to be sent. The leftmost bit in command bit pattern is transferred first.

Command 1: Reset command

During activation of the transponder a return to default

mode is possible from any mode with the reset command.

Command 2 : Read out of ROM 64 Bits

After activation of command 2, the 64 bit ROM data will be

read out cyclically. This mode will be active until power

down or reset command.

Command 3 : Write 16 Bit EEPROM word

After activation of command 3, a 16-bit EEPROM word can

be written. Data transmission will be secured by CRC

check information, which has to be calculated by the reader

and which will be checked by the EM4069.

Command 4 : Write configuration word

Command 4 has the same structure as command 3. The

16-bit configuration word is written by this command. A

partial locking (write inhibit) of the 128 bit memory is

possible in blocks of 16 bits (16 bit word becomes read-

only).

The bits of configuration word are OTP (one time

programmable) so once a certain bit in configuration word

is set it cannot be reset.

Copyright  2003, EM Microelectronic-Marin SA

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