參數(shù)資料
型號(hào)： 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(chē)設(shè)備的模擬前端集成電路TMS37122
文件頁(yè)數(shù)： 40/73頁(yè)
文件大?。?/td> 1189K
代理商： TMS37122
40
Analog Front End IC TMS37122 - Reference Guide
August ’01
the clock information (e.g. Manchester Coding). During Transmission Mode (TX=high) the
clock CLKM is available even if CLKA is disabled.
2.10.3.8 Passive Entry Wake Pattern
The desired Wake Pattern for the Passive Entry function can be selected as desired. If a sep-
arate transponder for Immobilizer function is in the system, pattern should be avoided, which
are similar to a Challenge telegram. This especially if the Base Station uses same modulation
principle for data transfer to the transponder.
2.10.3.9 Passive Start Wake Pattern
The Wake Pattern for the Passive Start function can be selected as required. If a separate tran-
sponder for Immobilizer function is in the system, patterns which are similar to a Challenge
telegram should be avoided. Especially if the Base Station uses same modulation principle
for data transfer to the transponder.
2.10.3.10Telegram Duration 'C_TELEGR'
If the Wake Pattern check detected a non-valid or incomplete Wake Pattern it can be assumed
that a foreign Base Station had requested communication from a foreign Identification De-
vice. To avoid ongoing wake-up of the non-addressed Identification Device a waiting period
is meaningful. Therefore a counter is loaded with ctelegr. The counter counts down using
CLKI as source. The resulting waiting time must be adapted to typical communication dura-
tion after a wake signal (see Table 6). The communication duration consists of the Challenge
Telegram and the UHF Response Telegram, which are together typically in the range of 100
ms. The telegram time is calculated with the following formula:
ttelegr = ctelegr / fTX
Attention:
If Passive Start Wake Pattern and Passive Entry Wake Pattern are equal, only
the Passive Start Sensitivity determines if the Transparent Mode is entered.
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