- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385001 > TMS37122 (Texas Instruments, Inc.) TIRIS Automotive Devices Analog Front End IC TMS37122 PDF資料下載
參數(shù)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(shè)備的模擬前端集成電路TMS37122 |
| 文件頁數(shù)： | 17/73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頁當(dāng)前第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
17
August ’01
Chapter 2. Electrical Description
2.2
Power Supply
2.2.1
VBAT Supply
Most parts of the 3D-AFE are supplied via VBAT input. Typically a 3 V Lithium Battery is
used but also the use of rechargeable batteries is possible. Directly at the TMS37122 input a
Buffer Capacitor (Cbat) should be provided with short connections to VBAT and GND pin.
Eventually also at the Microcomputer and UHF Transmitter input additional capacitor are re-
quired in order to meet the specified maximum power supply ripple (Vripple).
2.2.1.1
Standard Battery Supply
If Standard Battery Supply is desired, the VCCO output of the 3D-AFE is not used. Battery
Backup function (transmission via LF Channel in case of too low battery voltage) is not us-
able. The Charge Capacitor CL can therefore have the recommended standard value. Greater
capacitor values do not influence negatively the Write Distance Expander function. Beside
this it is possible to provide an additional LF Channel in order to overcome interference prob-
lems in this frequency band. The LF Response must take place before the UHF transmission
and is only possible if the battery voltage is above the minimum specified value, because the
supply of Microcomputer and 3D-AFE is not backed up.
Figure 5: Standard Battery Supply - Schematic
2.2.1.2
Rechargeable Battery Supply
If you are using a rechargeable battery, the restrictions described in section 2.2.1.1 can be
overcome. The de-coupling diode at the battery is eliminated (see Figure 6).
Weak batteries can be refreshed in the application or in special charge stations. The Identifi-
cation Device must therefore be placed in a strong continuous RF field so that the Charge Ca-
pacitor voltage (VCL) is in limitation. In this case the Voltage Regulator supplies high
enough voltage and current to the battery via output VCCO (short circuit between VCCO and
VBAT).
VOLT.
REG.
VBAT
3DSUP01.CH4
CR
LR
GND
VCL
RF
μC
Cbat = 22nF
Battery
VCCO
Rectifier
Diode
CL >= 22nF
VBAT
VCL
RF
相關(guān)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(guān)代理商/技術(shù)參數(shù) |
參數(shù)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(yīng)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(fēng)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(fù)。