T555401N-DDW Atmel, T555401N-DDW Datasheet - Page 15

• Manufacturer Part Number: T555401N-DDW
• Manufacturer: Atmel

Specifications of T555401N-DDW

• Screening Level: Industrial
• Lead Free Status / Rohs Status: Supplier Unconfirmed

Figure 5-2.
Figure 5-3.
5.3
5.4
4576D–RFID–12/06
Error Handling
Errors During Writing
Write mode
Modulation
Operation
HV on
Check V
V
Programming
Coil Voltage after Programming of Block 0
Coil 1 - Coil 2
pp
Write data into the IC
Several error conditions can be detected to ensure that only valid bits are programmed into the
EEPROM. There are two error types which lead to different actions.
There are four detectable errors which could occur during writing data into the T5554:
If any of these four conditions are detected, the IC starts read mode immediately after leaving
write mode. Reading starts with block 1.
• Wrong number of field clocks between two gaps
• The OP-code is neither the standard OP-code (’10‘) nor the stop OP-code (’11‘)
• Password mode is active but the password does not match the contents of block 7
• The number of bits received is incorrect; valid bit counts are
Write
– Standard write:
– Password write:
– AOR wake-up:
– Stop command:
Programming
16 ms
Vpp/Lock ok?
0.12 ms
HV on for testing if Vpp is ok
Writing done (> 64 clocks since last gap)
38 bits (PWD not set)
70 bits (PWD set)
34 bits
2 bits
Read programming block
(= block 0)
(HV at EEPROMs)
Programming starts
16 ms
No modulation
Program EEPROM
with updated modes
(e.g., new bitrate)
Read next block
Programming ends
Reading starts
READ
T5554
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