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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)： | 6/14頁 |
| 文件大小： | 116K |
| 代理商： | AS8412 |
High Performance Automotive Sonar Intrusion – Data Sheet
AS8412
March 2001
Page 6 of 14
Fig. 1 - Pulse/Echo Timing
TX pulse
Echo in RX
44,4ms
0,6ms
Supply / Power-On Reset
The AS8412 requires a single 5-volt power supply. Pins for VDD and GND are separated for
the analog and digital circuits, and a 100 nF ceramic decoupling capacitor is recommended for
each pair.
There is an internal power-on-reset circuit that initializes the IC after each power-up. The VDD
rise time must be less than 20 ms, to guarantee proper initialization. Optionally, the IC can also
be reinitialized with a rising-edge at the pin 14, if requested by the application.
Time Reference
A clock must be present at the OSCIN input. The frequency may be selected to be either 40
kHz or 400 kHz, by setting the SEL40K input to ‘1’ or ‘0’ respectively. For the 40 kHz clock a
duty-cycle of approximately 50% is necessary.
The clock signal can be created in several possible ways:
Generation by a microprocessor or other external circuit
Built-in oscillator with an external 40-kHz crystal between OSCIN and OSCOUT. Depending
on the crystal, a load capacitor (about 22 pF) may be needed at OSCOUT.
Built-in oscillator with an external 400-kHz ceramic resonator between OSCIN and
OSCOUT.
Load capacitors of at least 100 pF are necessary at the pins, according to the resonator speci-
fications. The IC power consumption increases with higher capacitor values (I
dd
= 1.0 mA with
100 pF capacitors).
Ultrasonic Transducers
The AS8412 is compatible with standard 40 kHz ultrasonic transducers, available from several
manufacturers. For each IC, one transducer is used to transmit the sonar pulses and one other
to receive the echoes reflected inside the vehicle. Internal lengths up to 3.5 meters can be cov-
ered.
In most applications, just two pairs of sensors will be used. The sensors will typically be posi-
tioned at the B-pillars (central pillars), close to the roof, to provide the best possible coverage of
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