P4069 EM Microelectronic, P4069 Datasheet - Page 5

• Manufacturer Part Number: P4069
• Description: 128 Bit Read/write Contactless Identification Device With Otp Function
• Manufacturer: EM Microelectronic

Read Mode
The P4069 holds 128 bits of user EEPROM. These
128 bits are cyclically read out by default. Using the
write command, the EEPROM words can be
modified. The EEPROM contains an additional
configuration word used to protect writing in the
EEPROM.
Manchester encoding
Bi-phase encoding
Command
Binary data
Memory output
Modulator control
Binary data
Memory output
Modulator control
Reset
RF-field detected
Sync-Pattern
P4069 Modes of operation
EM MICROELECTRONIC-MARIN SA
EEPROM Read Mode
X 1
Command State
0
IDLE
INIT
1
Command finished
1
1
1
Figure 5
1
1
1
1
Modulation control “low” means high current
Modulation control “low” means high current
1
0
The P4069 additionally holds a unique 64 bit read
only identification code, which can be accessed by
using the Read ROM command.
Manchester encoding
One bit period lasts 64 (or 32) field frequency periods
(512 (or 256) µs at 125 kHz). The Manchester coding
shows a transition from ON to OFF or from OFF to
ON in the middle of bit period. At the transition from
logic bit “1” to logic bit “0” or logic bit “0” to logic bit “1”
the phase change. Value "high" of data stream
presented below represents modulator switch OFF,
"low" represents switch ON (see figure 6a).
Bi-phase encoding
One bit period lasts 64 (or 32) field frequency periods
(512 (or 256) µs at 125 kHz). The BI-phase coding
shows a transition from ON to OFF or from OFF to
ON in the middle of a bit period when the data bit is a
logical “0”. A logical bit set to “1” will keep its ON or
OFF state for the whole bit period. There is always a
transition from ON to OFF or from OFF to ON at the
beginning of a bit period. The picture below shows
part of a data stream. Value “high” of data stream
represents modulator load OFF, “low” represents
modulator load ON (see figure 6b).
1
0
1
1
0
1
0
P4069/P4169
0
0
0
0
1
1
1
Figure 6a
Figure 6b
0
5