Datasheet > AS1716_V2

AS1716_V2

更新时间： 2022-10-11 11:50:58

品牌	Logo	应用领域
艾迈斯 - AMSCO		传感器
页数	文件大小	规格书
12页	317K
描述
Capacitive Sensor Interface

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AS1716_V2 数据手册

AS1716

Datasheet - Detailed Description

8 Detailed Description

Sensor Biasing and Input Protection Resistors

Due to the capacitive and differential nature of the knock sensor, the common mode voltage for the sensor must be set. This is ensured by the

first amplifier, whose virtual ground is biasing the sensor via a of 50kΩ resistor. Due to a failure, voltages up to 16V can occur on the input pins.

In this case two external serial resistors of 1kΩ must be applied at the inputs. These resistors are limiting the current, when the on chip protec-

tion diode opens.

Figure 9. Sensor Biasing

INN

VDDA

VDDA/2

Due to

failure

up to 16V

VDDA/2

typical

sensor

INP

VDDA/2

Inverting Input Structure

The Input Strucutre is a first order low-pass filter and fulfills two main functions. First, it is used for biasing the sensor and second, the first order

low-pass filter characteristic is used for noise suppression.

Figure 10. Input Buffer

VDDA/2

www.austriamicrosystems.com/Capacitive-Sensors/AS1716

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