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參數(shù)資料
| 型號： | AS8412 |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 消費家電 |
| 英文描述： | HIGH PERFORMANCE AUTOMOTIVE SONAR INTRUSION |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP20 |
| 封裝： | DIP-20 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大小： | 116K |
| 代理商： | AS8412 |
High Performance Automotive Sonar Intrusion – Data Sheet
AS8412
March 2001
Page 12 of 14
The blockage and saturation are signalized just one time at each occurrence, to avoid continu-
ous alarm triggering. Detection of glass breakage by saturation is not guaranteed.
Table 3. Disturbances detected by the AS8412
LED
pulsing
pulsing
0
pulsing
0
ALARM
1
1
0
0
0
WARN
1
0
0
1
1
Conditions
no disturbance
weak intrusion
intrusion
blockage
saturation
WARN
ALARM
t
al
t
al
t
al
t
ONW
t
ONN
Fig. 7 - Weak Intrusion followed by an Intrusion
Courtesy Entry/Exit Time
The pin ALEN is an optional alarm enable input that can be used to provide a courtesy entry
and/or exit time. When tied to VDD, normal alarm operation is enabled. If ALEN is grounded,
the outputs ALARM, WARN and LED are disabled, except during the self-test, when LED indi-
cates the test result.
By grounding ALEN, the IC can be made inoperative as seen by the control unit and still keeps
its internal processing. This is useful when intrusion detections must be temporarily inhibited,
or to block self-test pulses at ALARM and WARN.
During the first 10 or 20 seconds after shutting a door in a hot and sunny day, an alarm indica-
tion may occur, due to thermal gradients inside the vehicle. That should be considered when
choosing a courtesy time for an AS8412-based system. When an RC circuit connected to the
supply voltage is applied to ALEN, the courtesy time after power-up is given by:
T
≈
0.92 x R x C
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相關代理商/技術參數(shù) |
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