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): 34/73頁
文件大?。?/td> 1189K
代理商: TMS37122
34
Analog Front End IC TMS37122 - Reference Guide
August ’01
Figure 20: Default Memory Content
The default PPM Threshold is configured for a medium data rate of 2kBit/s, realized for ex-
ample with a low bit period of tbitL=400 and a high bit period of tbitH=600μs (see Figure
12). It is assumed that toff is as short as possible (toff<=100μs), but still achieving 50% mod-
ulation (m=33%) under all conditions. Under this assumptions CLKA is available continu-
ously or interrupted only shortly during toff. If this cannot be achieved due to lower quality
factors and thereore stronger damping, or if higher data rates are demanded, PPM Threshold
must be adapted.
0
1
2
3
NIBBLE
ROW
1
2
Bit 0
Bit 3
Bit 3
Bit 0
VWAKE B/ 1
1
VWAKE A/ 1
1
Bit 3
Bit 0
VWAKE B/ 2/3
1
PPM THRESHOLD
1
Bit 0
Bit 3
Bit 0
4
0
NO
WAKE
PASSIVE ENTRY WAKE PATTERN
0
0
0
C_TELEGR
0
PASSIVE START WAKE PATTERN
0
0
0
C_WAIT
0
Bit 15
Bit 0
Bit 3
Bit 3
NO
CLKA
Bit 0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
NO
WDE2
NO
WDE3
3DMEMD4.DRW
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