參數(shù)資料
型號(hào)： T555200-PAE
廠商： ATMEL CORP
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PXMA
文件頁(yè)數(shù)： 12/16頁(yè)
文件大?。?/td> 1154K
代理商： T555200-PAE
5
4697B–RFID–06/06
T5552
Figure 3-2.
Data Stream Pattern Depending on MAXBLK
Any field gap occurring during initialization will restart the complete sequence.
T
INIT = (114 + 8.192 × delay bit)/125 kHz ≈
65 ms
After this initialization time the T5552 enters uplink mode and modulation starts automatically,
using the parameters defined in the configuration block.
3.4
Uplink Operation
All transmissions from the IC to the base station utilize amplitude modulation (ASK) of the RF
carrier. This takes place by switching a resistive load between the coil pads (Coil 1 and Coil 2)
which in turn modulate the RF field generated by the base station (reflective back scatter
modulation).
3.4.1
MaxBlock
Data from the memory is serially transmitted, starting with block 1, bit 1, up to the last block
(MAXBLK), bit 32. The last block to be transmitted is defined by the mode parameter field MAX-
BLK which is stored in EEPROM block 0. When the MAXBLK address has been reached, data
transmission restarts with block 1.
The user defines the cyclic data stream by setting the MAXBLK to a valve between 0 and 31
(representing each of the 32 data blocks). If set to 1, only block 1 is transmitted. If set to 31,
blocks 1 to 31 will be sequentially transmitted. If set to 0, only the contents of the configuration
block (normally not accessible) will be transmitted (see Figure 3-2).
It is also possible to access a single data block selectively, independent of the MAXBLK value,
by using the direct access command (Opcode “11”). Thus the addressed data block is transmit-
ted continuously.
3.4.2
Data Encoding
When entering the uplink mode, the data stream is always preceded by a single start bit (always
“0”). Then the data stream continues with block 1, bit 1, etc. up to MAXBLK, bit 32. This data
stream pattern cycles continuously.
The modulator is configurable for Manchester mode.
Manchester-encoded data represent a logical “1” with a rising edge and a logical “0” with a fall-
ing edge.
Block 1
Block 2
Block 30
Block 31
MAXBLK = 31
MAXBLK = 1
MAXBLK = 2
Block 1
Block 2
Block 1
Block 2
Block 1
0
Loading block 0
MAXBLK = 0
Block 0
0
Loading block 0
Block 1
....
Block 1
Block 2
Block 0
Block 2
Block 1
Block 0
(not transmitted)
Refreshing configuration register
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