EM4056 Datasheet, PDF (4/14 Pages) EM Microelectronic - MARIN SA – 2KBIT Read/Write with ANTICOLLISION Contactless Identification Device

EM4056
Timing Characteristics
Parameter
Emission Bit Period
Reception Bit Period
Reception Bit Period Arbitration
Select processing time
Read processing time
Write processing time
Arb1 processing time
Arb2 processing time
Arbitration format duration
Read Rom format duration
Select format duration
Prot format duration
Read format duration
Write format duration
Comp format duration
Login format duration
EEPROM Write duration
Symbol
Tb0
Tb1
Tab
Tbit
Tbitarb
Tsp
Trp
Twp
Ta1p
Ta2p
Tarb
Tro
Ts
Tp
Tr
Tw
Tc
Tl
T_ee
Conditions
Modulation duration
Bit 0
Bit 1
Start bit
V_DD = 3V
Typ
ON OFF ON
26 8
36 8
8 16 8
64
32
190
126
3134
62
10
115
24.5
19.1
32.2
20.3
36.6
16.6
35.1
20.0
Units
RF periods
RF periods
RF periods
RF periods
RF periods
RF periods
RF periods
RF periods
ms
Functional Description
General
The EM4056 has a read enable bit (RdEn) realised with a flip-flop cell. If the RdEn bit is set to « 0 », the transponder is
always allowed to answer otherwise it answers only on special commands.
At power on, the default value of the RdEn bit is 0. Therefore, after switching the field on, the RdEn bit of all known tags may
be set by the reader in order to separate them in two groups.
The block check sequence uses a 8 bits CRC which is the same polynom for all CRC blocks.
In addition, the CRC block from the EM4056 to the reader is sent in the format of the BitVal frame (see arbitration mode) to
increase the error detection rate in the reader.
Memory organisation
Address Bit
Bit 0 is defined as the first bit output
Bit
17
1
0
0000000
LASER ROM (3 * 18)
0000010
EEPROM (123 * 18)
1111110
Configuration Word
1111111
PIN Word
Config Word definition + Laser Rom area definition
The Read Protected and the Write Protected bit are OTP bit. Once written to one,
it is definitively locked. No possibility to erase them to zero.
Fig.4
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