AS5215 DB (ams) Datasheet资料下载 PDF(9/27 页)

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AS5215

Datasheet - D e t a i l e d D e s c r i p t i o n

7 Detailed Description

The AS5215 is a redundant rotary encoder sensor front end. Based on an integrated Hall element array, the angular position of a simple two-pole

magnet is translated into analog output voltages. The angle information is provided by means of sine and cosine voltages. This approach gives

maximum flexibility in system design, as it can be directly integrated into existing architectures and optimized for various applications in terms of

speed and accuracy.

With two independent dies in one package, the device offers true redundancy. Usually the bottom die, which is exposed to slightly less magnetic

field is employed for plausibility check.

An SSI (SPI standard) protocol is implemented for internal test access to the different circuit blocks and for signal path configuration.

A One Time Programmable register block (OTP) allows the customer to adjust the signal path gain to adjust for different mechanical constraints

and magnetic field strengths. Furthermore, for internal use, the test mode can be enabled and the system oscillator is trimmable, DC offset of the

output signal can be set to either 1.5V or 2.5V. A unique chip ID is stored to ensure traceability.

For operating point control, a band gap circuit is implemented together with a central bias block to distribute all reference bias currents for the

analog signal conditioning. The digital signal part is based on a 2MHz system, CLK derived via. divider from a 4MHz system oscillator.

Figure 3. Typical Arrangement of AS5215 and Magnet

7.1 Magnet Diameter and Vertical Distance

Note: Following is just an abstract taken from the elaborate application note on the Magnet.

For more detailed information, please visit our homepage www.austriamicrosystems.com → Magnetic Rotary Encoders → Magnet

Application Notes

7.1.1

The Linear Range

The Hall elements used in the AS5000-series sensor ICs are sensitive to the magnetic field component Bz, which is the magnetic field vertical to

the chip surface. Figure 4 shows a 3-dimensional graph of the Bz field across the surface of a 6mm diameter, cylindrical NdFeB N35H magnet at

an axial distance of 1mm between magnet and IC.

The highest magnetic field occurs at the north and south poles, which are located close to the edge of the magnet, at ~2.8mm radius (see Figure

5) . Following the poles towards the center of the magnet, the Bz field decreases very linearly within a radius of ~1.6mm. This linear range is the

operating range of the magnet with respect to the Hall sensor array on the chip. For best performance, the Hall elements should always be within

this linear range.

www.austriamicrosystems.com/AS5215

Revision 1.11

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相关代理商/技术参数	参数描述
AS5215-HQFT	制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:Programmable 360o Magnetic Angle Encoder with Buffered SINE & COSINE Output Signals
AS5215-HQFT-OM	制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:Programmable 360o Magnetic Angle Encoder with Buffered SINE & COSINE Output Signals
AS5215OM	制造商:ams 功能描述:IC ENCODER PROG 32QFN 制造商:ams 功能描述:T&R / QFN 32
AS5215OM-500	制造商:ams 功能描述:IC ENCODER ROTARY 32-QFN
AS5215OM-HMFM	功能描述:IC ENCODER ROTARY 32-QFN 制造商:ams 系列:汽车级，AEC-Q100 零件状态:有效编码器类型:磁性输出类型:电压每转脉冲数:- 电压 - 电源:4.5 V ~ 5.5 V 致动器类型:外磁铁，不含棘爪:无内置开关:无安装类型:表面贴装朝向:- 端子类型:SMD（SMT）接片旋转寿命（最少次数）:- 标准包装:1

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