- 您現(xiàn)在的位置：買賣IC網 > PDF目錄385001 > TMS37122 (Texas Instruments, Inc.) TIRIS Automotive Devices Analog Front End IC TMS37122 PDF資料下載
參數資料
| 型號： | TMS37122 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TIRIS Automotive Devices Analog Front End IC TMS37122 |
| 中文描述： | 提里斯汽車設備的模擬前端集成電路TMS37122 |
| 文件頁數： | 52/73頁 |
| 文件大?。?/td> | 1189K |
| 代理商： | TMS37122 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁當前第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁
52
Analog Front End IC TMS37122 - Reference Guide
August ’01
3.2
Passive Start Function
A further application of 3D-AFE is the Passive Start function. The car driver is already seated
in the car and triggers the Base Station by pushing a button at the dashboard or at the middle
console. The Base Station transmits now the Passive Start (PS) Wake Pattern, a Command
and a Challenge using an indoor Antenna, located for example in the dashboard, seat or door.
The Antenna is driven by a LF Transceiver, which is typically activated with an active low
signal called TXCT- (see Figure 30).
It is assumed that the Identification Device is in Standby Mode (WDEEN=high). During
Wake-up Time the IC internal wake (WAKEI) will be activated if the threshold VWAKEA
is exceeded at one or more antennas. The first WAKEI signal determines the receive channel.
During the Waiting Time (twait) the Base Station will start modulation while sending the PS
Wake Pattern. The internal clock CLKI will be active during this period.
If the received PS Wake Pattern is equal to the PS Wake Pattern in the EEPROM, the RF level
check with VWAKEB will be performed (sensitivity stays at VWAKEA level). If the level is
higher than VWAKEB, the output WAKE is set. This will cause the Microcomputer of the
Identification Device to wake-up after an eventually μC Wake Delay. Depending on the re-
quired time, the Base Station should insert an active period between Wake Pattern and Com-
mand transmission.
The digitized amplitude modulation is output at the EOBA and demodulation is done by the
Microcomputer. For this purpose the CLKA signal can be used as reference, which is avail-
able at output EOBA/M.
The Command sent to the Microcomputer must include an information that a Passive Start
action is requested.
After checking the Command, the Microcomputer knows that a Passive Start function is re-
quested. The Challenge will be encrypted (ENCR), respectively the Rolling Code will be de-
termined depending on the system. Then the Microcomputer waits for the next EOBA signal
created by the Base Station, switching off the Transmitter. When this has happened, the UHF
Transmitter is activated and the Response Telegram is sent to the Base Station. There the Re-
sponse is checked and the engine is started if valid.
The Microcomputer initializes the 3D-AFE after transmission of the Response with a short
negative pulse at WDEEN. The circuit returns to Standby Mode and is ready for next cycle.
相關PDF資料 |
PDF描述 |
|---|---|
| TMS37134 | Entry Transponder IC |
| TMS4161 | GRAPHICS SYSTEM PROCESSOR |
| TMS3469910000 | GRAPHICS SYSTEM PROCESSOR |
| TMS4461 | GRAPHICS SYSTEM PROCESSOR |
| TMSSTDB10 | GRAPHICS SYSTEM PROCESSOR |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TMS37122DPWRG4 | 制造商:Texas Instruments 功能描述:3D Analog Front-end, TITL |
| TMS37145TEAIE | 制造商:Texas Instruments 功能描述: |
| TMS37145TEAIEG | 制造商:Texas Instruments 功能描述: |
| TMS37157IRSARG4 | 功能描述:RFID應答器 Pass Lo Freq Interf Dev W/ EEPROM RoHS:否 制造商:Murata 存儲容量:512 bit 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體: 封裝:Reel |
| TMS3734DFNR | 制造商:Texas Instruments 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。