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參數(shù)資料
| 型號(hào)： | AS8413 |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類(lèi)： | 消費(fèi)家電 |
| 英文描述： | HIGH PERFORMANCE AUTOMOTIVE SONAR INTRUSION |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP24 |
| 封裝： | DIP-24 |
| 文件頁(yè)數(shù)： | 11/15頁(yè) |
| 文件大?。?/td> | 125K |
| 代理商： | AS8413 |
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High Performance Automotive Sonar Intrusion – Data Sheet
AS8413
March 2001
Page 11 of 15
SAS disabled (pin SAS = “0”)
The IC will keep the sensitivity fixed at the upper limit of the programmed range, regardless of
the environmental conditions. This mode can be useful in special applications that demand a
fixed or externally controlled sensitivity. The VCAP capacitor may have to be up to 4 times
bigger than it would be with the SAS enabled, to compensate the fixed high sensitivity and
avoid false alarms. Another use of this mode is to allow an easier characterization of the up-
per sensitivity limit during the system development.
The self-test indicates an error with SAS = ”0”. To generate a valid self-test, SAS must be “1”
during power-up. It may be switched afterwards.
Together with the AGC, the SAS loop provides improved controllability over the intrusion detec-
tion process, allowing the system to be little affected by changes in the external conditions, such
as temperature, supply voltage and sensitivity of the ultrasonic sensors.
In any case, the sensitivity can be very significant, so the AS8413 is not adequate to be used in
convertibles or with open windows.
DSP and Fuzzy-Logic Discriminator
Many external phenomena may affect the ultrasonic waves inside the vehicle. Sunlight, blows at
the glasses or roof, wind through the ventilation flaps are some examples.
Experiments have shown that a real intrusion can not be validated by a single specific charac-
teristic of the echo waveform. Several parameters must be observed at the same time and also
how they correlate with each other. Experimental data gathered from extensive field testing were
used to support the detection criteria embedded in the AS8413.
To implement those criteria, first the digitized echoes are processed by a DSP circuit to en-
hance the parameters to be monitored. Then, a fuzzy-logic discriminator continuously examines
how those parameters change and correlate, to verify any possible intrusion.
Built-In-Self-Test
When power is applied and SAS=’1’, the master AS8413 goes automatically into a self-test rou-
tine that checks the IC operation. It can also detect initialization errors due to a slow supply rise
time or a clock problem at OSCIN. The self-test does not operate in a slave IC.
During the self-test period, the IC outputs are exercised and should be ignored. If the test is suc-
cessful, normal operation starts, indicated by the output LED pulsing periodically.
In the case of an IC malfunction, immediately after the self-test the LED and WARN outputs are
turned on (low) for about 4.4 seconds. If a light-emitting diode is connected to the LED output,
the self-test message may be seen directly by the user.
After an error message, the LED starts to blink again, as in a normal operation. Fig. 6 shows the
possible self-test waveforms after power-on.
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