T5557 Datasheet, PDF (13/30 Pages) ATMEL Corporation – Multifunctional 330-bit Read/Write RF-Identification IC

T5557
Figure 15. T5557 Functional Diagram
* p = page selector
Page 0
Power-on reset
Setup modes ^{AOR = 1}
AOR mode
AOR = 0
Regular-read mode
addr = 1 .. maxblk
Page 0 or 1
Start
Gap
gap ^{Block-read mode}
addr = current
gap
Modulation defeat ^{single gap}
command mode
Command decode
OP(11..)
Page 1
Page 0
Direct access OP (1p)*
OP (1p)*
OP(00)
Reset
to page 0
OP(10..)
Write
OP(1p)*
Write
OP(01)
Test-mode
if master key <> 6
Data verification failed
fail
Number of bits
Password check
fail
fail
Lock bit check
Program & Verify ^ok
data = old
data = old
data = old
data = new
T5557 in Extended
Mode (X-mode)
In general, the block 0 setting of the master key (bits 1 to 4) to the value ‘6’ or ‘9’
together with the X-mode bit will enable the extended mode functions.
• Master key = ‘9’: Test mode access and extended mode are both enabled.
• Master key = ‘6’: Any test mode access will be denied but the extended mode is still
enabled.
Any other master key setting will prevent the activation of the T5557 extended mode
options, even when the X-mode bit is set.
Binary Bit-rate Generator In extended mode the data rate is binary programmable to operate at any data rate
between RF/2 and RF/128 as given in the formula below.
Data rate = RF/(2n+2)
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4517E–RFID–02/03