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參數(shù)資料
| 型號： | TK5552 |
| 廠商： | Atmel Corp. |
| 英文描述： | Read/Write Transponder |
| 中文描述： | 讀/寫轉(zhuǎn)發(fā) |
| 文件頁數(shù)： | 15/22頁 |
| 文件大?。?/td> | 326K |
| 代理商： | TK5552 |
15
TK5552
4698A–RFID–04/03
Downlink Operation
Data is transmitted from the base station by amplitude modulation of the field (m = 1),
using a series of so called gaps. With the exception of the initial synchronization gap
(start gap), all field gaps have the same duration, the logical data being encoded in the
length of the unmodulated phases (see Figure 19)
A valid data stream is always preceeded by a start gap which is approximately twice as
long as a normal field gap. Detection of this first gap causes the transponder IC to
switch immediately to downlink mode where it can receive and decode the following
data stream. This stream consists of two opcode bits, followed by (0 or 33) data bits
(including the lock bit) and finally (0, 3 or 5) address bits. In downlink mode the tran-
sponder damping is permanently enabled. This loads the resonant transponder coil
circuit so that it comes quickly to rest when field gaps occur – thus allowing fast gap
detection.
Figure 19.
Entering Downlink Mode
A start gap will be accepted at any time after start-up initialization has been finished (RF
field ON plus 1 ms, start-up delay inactive) if the IC is not in downlink mode.
Downlink Data Coding
The duration of a field gap is typically between 80 μs and 250 μs. After the start gap the
data bits are transmitted by the base station whereby each bit is separated by a field
gap. The bit decoder interprets 16 to 32 internal field clocks as a logical 0 and 48 to 64
internal field clocks as a logical 1 (see Figure 20). Therefore, the time between two gaps
is typically 24 field clocks for a 0 and 56 field clocks for a 1.
Whenever the bit decoder detects more than 64 field clocks, the transponder IC will
abort the downlink mode. The incoming data stream is checked continuously. If any
error occurs, the corresponding error handling will be initiated.
The control logic initiates an EEPROM programming cycle if the correct number of bits
had been received (see Figure 21).
RF
Read mode
Receive mode
Damping ON
Damping OFF
Start gap + data '0'
Field gap + data '0'
Field gap + data '1'
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TK5552A-PP | Read/Write Transponder |
| TK5561A-PP | READ/WRITE CRYPTO TRANSPONDER FOR SHORT CYCLE TIME |
| TL061AMN | LOW POWER J-FET SINGLE OPERATIONAL AMPLIFIER |
| TL061B | LOW POWER J-FET SINGLE OPERATIONAL AMPLIFIER |
| TL061BC | LOW POWER J-FET SINGLE OPERATIONAL AMPLIFIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TK5552A-PP | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Read/Write Transponder |
| TK5561A-PP | 功能描述:射頻無線雜項(xiàng) Crypto-Transp. Prog f.all appl. RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
| TK55A10J1(Q) | 制造商:Toshiba America Electronic Components 功能描述: 制造商:Toshiba America Electronic Components 功能描述:Trans MOSFET N-CH 100V 55A 3-Pin(3+Tab) TO-220SIS |
| TK55D10J1 | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Switching Regulator Applications |
| TK55D10J1(Q) | 功能描述:MOSFET MOSFET N-Ch RoHS:否 制造商:STMicroelectronics 晶體管極性:N-Channel 汲極/源極擊穿電壓:650 V 閘/源擊穿電壓:25 V 漏極連續(xù)電流:130 A 電阻汲極/源極 RDS（導(dǎo)通）:0.014 Ohms 配置:Single 最大工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:Max247 封裝:Tube |
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