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參數(shù)資料
| 型號： | T5743P6-TGQ |
| 廠商： | ATMEL CORP |
| 元件分類： | 通信及網(wǎng)絡 |
| 英文描述： | UHF ASK/FSK Receiver |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO20 |
| 封裝： | SO-20 |
| 文件頁數(shù)： | 13/41頁 |
| 文件大小： | 681K |
| 代理商： | T5743P6-TGQ |
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13
T5743
4569A–RKE–12/02
Figure 11.
Timing Diagram for Complete Successful Bit Check
Bit-check Mode
In bit-check mode the incoming data stream is examined to distinguish between a valid
signal from a corresponding transmitter and signals due to noise. This is done by subse-
quent time frame checks where the distances between two signal edges are
continuously compared to a programmable time window. The maximum count of this
edge-to-edge tests before the receiver switches to receiving mode is also
programmable.
Configuring the Bit Check
Assuming a modulation scheme that contains two edges per bit, two time frame checks
are verifying one bit. This is valid for Manchester, Bi-phase and most other modulation
schemes. The maximum count of bits to be checked can be set to 0, 3, 6 or 9 bits via the
variable N
Bit-check
in the OPMODE register. This implies 0, 6, 12 and 18 edge to edge
checks respectively. If N
Bit-check
is set to a higher value, the receiver is less likely to
switch to receiving mode due to noise. In the presence of a valid transmitter signal, the
bit check takes less time if N
Bit–check
is set to a lower value. In polling mode, the bit-check
time is not dependent on N
Bit-check
. Figure 11 shows an example where 3 bits are tested
successfully and the data signal is transferred to Pin DATA.
According to Figure 12, the time window for the bit check is defined by two separate
time limits. If the edge-to-edge time t
ee
is in between the lower bit-check limit T
Lim_min
and
the upper bit-check limit T
Lim_max
, the check will be continued. If t
ee
is smaller than
T
Lim_min
or t
ee
exceeds T
Lim_max
, the bit check will be terminated and the receiver
switches to sleep mode.
Figure 12.
Valid Time Window for Bit Check
For best noise immunity it is recommended to use a low span between T
Lim_min
and
T
Lim_max
. This is achieved using a fixed frequency at a 50% duty cycle for the transmitter
preburst. A “11111...” or a “10101...” sequence in Manchester or Bi-phase is a good
choice concerning that advice. A good compromise between receiver sensitivity and
susceptibility to noise is a time window of ±25% regarding the expected edge-to-edge
time t
ee
. Using pre-burst patterns that contain various edge-to-edge time periods, the
bit-check limits must be programmed according to the required span.
The bit-check limits are determined by means of the formula below.
Bit check
IC_ACTIVE
Data_out (DATA)
1/2 Bit
Start-up mode
( Number of checked Bits: 3 )
Bit check ok
1/2 Bit
1/2 Bit
1/2 Bit
1/2 Bit
1/2 Bit
Receiving mode
Dem_out
Bit-check mode
T
Start-up
T
Bit-check
Dem_out
t
ee
T
Lim_min
T
Lim_max
1/f
Sig
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| T5744-TGS | UHF ASK Receiver |
| T5744-TKQ | UHF ASK Receiver |
| T5744-TKS | UHF ASK Receiver |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| T5743P6-TGS | 功能描述:IC RCVR300-450MHZ ASK/FSK 20SOIC RoHS:否 類別:RF/IF 和 RFID >> RF 接收器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 09/Jan/2012 標準包裝:50 系列:* 頻率:850MHz ~ 2.175GHz 靈敏度:- 數(shù)據(jù)傳輸率 - 最大:- 調(diào)制或協(xié)議:- 應用:* 電流 - 接收:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 特點:- 電源電壓:4.75 V ~ 5.25 V 工作溫度:0°C ~ 85°C 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| T5744 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:UHF ASK Receiver |
| T5744N-TGQ | 功能描述:IC RCVR PLL ASK 450MHZ 20-SOIC RoHS:否 類別:RF/IF 和 RFID >> RF 接收器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 09/Jan/2012 標準包裝:50 系列:* 頻率:850MHz ~ 2.175GHz 靈敏度:- 數(shù)據(jù)傳輸率 - 最大:- 調(diào)制或協(xié)議:- 應用:* 電流 - 接收:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 特點:- 電源電壓:4.75 V ~ 5.25 V 工作溫度:0°C ~ 85°C 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| T5744N-TGS | 功能描述:IC RCVR PLL ASK 450MHZ 20-SOIC RoHS:否 類別:RF/IF 和 RFID >> RF 接收器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 09/Jan/2012 標準包裝:50 系列:* 頻率:850MHz ~ 2.175GHz 靈敏度:- 數(shù)據(jù)傳輸率 - 最大:- 調(diào)制或協(xié)議:- 應用:* 電流 - 接收:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 特點:- 電源電壓:4.75 V ~ 5.25 V 工作溫度:0°C ~ 85°C 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| T5744N-TGSY | 制造商:Atmel Corporation 功能描述: |
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