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參數(shù)資料
| 型號： | T555200-PAE |
| 廠商： | ATMEL CORP |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PXMA |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 1154K |
| 代理商： | T555200-PAE |
4
4697B–RFID–06/06
T5552
3.
Operating the T5552
Figure 3-1.
Voltage at Coil 1/Coil 2 After Power-on
3.1
General
The basic functions of the T5552 are to supply the IC from the RF field, read data out of the
EEPROM and shift them to the modulator, receive data and program these data bits into the
EEPROM. An error detecting circuit prevents the EEPROM from being overwritten with wrong
data.
3.2
Power Supply
The IC is supplied via a tuned LC circuit which is connected to Coil 1/Coil 2 pads. The incoming
RF induces a current into the coil. The on-chip rectifier generates the DC supply voltage. Over-
voltage protection prevents the IC from damage due to high field strengths. Depending on the
coil, the open-circuit voltage across the LC circuit can reach more than 100V.
3.3
Initialization
The occurrence of an RF field triggers a power-on reset pulse, ensuring a defined start-up. The
Power-On-Reset (POR) circuit remains active until an adequate voltage threshold has been
reached. This in turn triggers the default start-up delay sequence. During this period of 114 field
clock cycles (FC), the T5552 is initialized with the configuration data stored in EEPROM block 0.
This is followed by an additional delay time which is defined by the “Start-up Delay” bit.
If the “Start-up Delay” bit is set, the T5552 remains inactive until 8192 RF clock cycles have
occurred. If this option is deactivated, no delay will occur after the configuration period of 114 RF
clock cycles (
≈ 1 ms).
Damping on
Damping off
Power-on reset
Read data with selected
modulation and bit rate
Loading block 0 (114 FC
≈ 1 ms),
start-up delay inactive
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