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): 39/73頁
文件大小: 1189K
代理商: TMS37122
39
August ’01
Chapter 2. Electrical Description
2.10.3.4 Wake Pattern Detection Flag 'NO_WAKE'
If the NO_WAKE flag is set no Wake Pattern check is performed and the Control Unit
switches directly to Transparent Mode if VWAKE-A threshold is exceeded.
2.10.3.5 Write Distance Expander 2 Flag 'NO_WDE2'
If the NO_WDE2 flag is set the Wake Detector of RF2 input is completely disabled. The RF2
input should be connected to VCL externally in this case. Standby current consumption is re-
duced due to this.
2.10.3.6 Write Distance Expander 3 Flag 'NO_WDE3'
If the NO_WDE3 flag is set the Wake Detector of RF3 input is completely disabled. In this
case the RF3 input should be connected to VCL externally. Standby current consumption is
reduced due to this.
2.10.3.7 CLKA Output Disable Flag ‘NO_CLKA’
If the NO_CLKA flag is set, the CLKA/M output does not provide a clock when WAKE is
activated. This prevents back coupling of interference to the sensitive RF inputs due to not
optimized PCB layout.
The option can be used at identification devices, which do not require the CLKA. This is the
case, if the microcomputer is able to measure period duration or if the data (EOBA) includes
Table 5: Counter Definition for Pulse Position Demodulation
Pulse Position Modulation
PPM Threshold
DEC
Chdet
Thdet Nom.[μs]
MSB
LSB
0
-
-
0
0
0
0
1
8
59
0
0
0
1
2
16
119
0
0
1
0
3
24
179
0
0
1
1
4
32
238
0
1
0
0
5
40
298
0
1
0
1
6
48
358
0
1
1
0
7
56
417
0
1
1
1
8
64
477
1
0
0
0
9
72
537
1
0
0
1
10
80
596
1
0
1
0
11
88
656
1
0
1
1
12
96
715
1
1
0
0
13
104
775
1
1
0
1
14
112
112
1
1
1
0
15
120
894
1
1
1
1
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