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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)： | 28/73頁 |
| 文件大?。?/td> | 1189K |
| 代理商： | TMS37122 |
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28
Analog Front End IC TMS37122 - Reference Guide
August ’01
2.8.1
Off Mode
The Control Unit is reset with low level at input WDEEN (see Figure 14).
No internal power-on-reset circuit is provided. The circuit is in Off Mode and consumes only
the quiescent current (Iquiet). All battery powered analog parts and current sources are
switched off.
A charge-up of the Charge Capacitor CL is still possible, because the constant current source
required for Voltage Regulator is supplied by VCL. Because of this behavior the battery can
be charged in Battery Charge Mode even if WDEEN is off.
Figure 14: Initialization State Diagram of TMS37122
2.8.2
Standby Mode
The Control Unit includes a Configuration Memory (EEPROM), which can be programmed
via the Test/Trimming Interface. The Configuration Memory determines different modes and
timings. The configuration Memory is read when WDEEN (or WDEENIx) is set to high lev-
el. After the readout the circuit is in the Standby Mode and consumes the Standby Current
(Istby). In this state the unit remains as long as the RF amplitudes of all activated resonant
circuits are below the threshold level VWAKEA.
2.8.3
Init Mode
If a carrier is present and the amplitude at one of the three antennas exceeds the WAKE Sen-
sitivity Level A (WAKESensA1/2/3) for about 1 ms, the EOBI detector is activated.
As soon as the RF Amplitude of one resonant circuit increases, the AGC Amplifier starts to
regulate. After the run-in time (tPdly) the amplitude is checked. If the amplitude exceeds the
threshold level VWAKEA, and the regenerated clock (CLKI) is stable for twait and has no
significant interruptions (>2 clocks), the internal wake signal (WAKEI1, WAKEI2 or
WAKEI3) of the related channel is set (see Figure 15). Until this occurs the current increases
(Iinit) due to clock activity of three channels.
2.8.4
Active Mode
After detection of the first WAKEI the Control Unit disables the other activated Wake Detec-
tors in order to minimize the power consumption.CLKI and EOBI are selected accordingly.
OFF MODE
(Iquiet)
STANDBY
VWAKEA=ON
(Istby)
VRF <
VWAKEA
WDEEN=LOW
WDEEN
= LOW
WDEEN=HIGH
and
TX = LOW
3DSTAT2.CH4
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