Datasheet > AS8412

AS8412

更新时间： 2024-01-02 19:18:55

品牌	Logo	应用领域
艾迈斯 - AMSCO		/
页数	文件大小	规格书
14页	117K
描述
HIGH PERFORMANCE AUTOMOTIVE SONAR INTRUSION

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AS8412 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Contact Manufacturer	零件包装代码：	SOIC
包装说明：	SOP,	针数：	20
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.84	商用集成电路类型：	CONSUMER CIRCUIT
JESD-30 代码：	R-PDSO-G20	JESD-609代码：	e3
湿度敏感等级：	3	功能数量：	1
端子数量：	20	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified	最大压摆率：	1.6 mA
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	4.5 V
表面贴装：	YES	技术：	CMOS
温度等级：	INDUSTRIAL	端子面层：	MATTE TIN
端子形式：	GULL WING	端子位置：	DUAL
处于峰值回流温度下的最长时间：	40

AS8412 数据手册

High Performance Automotive Sonar Intrusion – Data Sheet

AS8412

0,6ms

TX pulse

44,4ms

Echo in RX

Fig. 1 - Pulse/Echo Timing

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

March 2001

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