ZMID520x系列是电感式位置传感器旋转360度解决方案_技术

IDT公司的ZMID520x系列是电感式位置传感器,采用线回路和涡流产生电感的原理来检测导电物体在线圈上滑动或旋转的位置,旋转检测全方位360度,PWM数字输出,过压,反相极性,ESD和短路保护,10位分辨率,满足汽车标准AEC-Q 100, grade 0,工作温度-40°C 到150°C,主要用在高达360度的旋转位置传感器如转向角传感器,替换电位器,小角度传感器或弧线运动传感器如阀门传感器,汽车水平传感器以及线性运动传感器如液面传感器.本文介绍了ZMID520x系列主要特性,功能框图,应用电路以及评估板ZMID520x EVK主要特性,主要元件分布图,ZMID5201/02/03演示板电路图,材料清单和PCB设计图.

The ZMID520x uses the physical principles of inducTIon in a wire loop and eddy currents to detect the posiTIon of an electrically conducTIng target that is sliding or rotaTIng above a set of coils, consisting of one transmitter coil and two receiver coils.

The three coils are typically printed as copper traces on a printed circuit board (PCB). They are arranged such that the transmitter coil induces a secondary voltage in the receiver coils that depends on the position of the metallic target above the coils.

A signal representative of the target’s position over the coils is obtained by demodulating and processing the secondary voltages from the receiver coils. The target can be any kind of metal, such as aluminum, steel or a PCB with a printed copper layer.

The ZMID5202 is an inductive position sensor IC with PWM output, used for absolute rotary and linear motion sensing in automotive, industrial and consumer applications. The ZMID5202 uses the physical principles of induction in a wire loop and eddy currents to detect the position of a metallic target that is sliding or rotating above a set of coils, consisting of one transmitter coil and two receiver coils. The three coils are typically printed as copper traces on a printed circuit board (PCB). They are arranged such that the transmitter coil induces a secondary voltage in the receiver coils which depends on the position of the metallic target above the coils. After demodulating and processing the secondary voltages from the receiver coils, a signal representative of the metallic target’s position over the coils is obtained.

The ZMID5201/-02-/03 ICs are fully qualified to the automotive standard AEC-Q 100, grade 0 from -40°C up to 150°C ambient temperature.

ZMID5202主要特性:

Inductive principle

Rotation sensing up to a full turn of 360º

PWM digital output

Overvoltage, reverse polarity, ESD and short circuit protection

10-bit resolution

Power or ground loss detection

Facilitates redundant design requirements

Programmable linearity correction

Adaptive gain control supporting a wide range of coil designs

Diagnostic features supporting ISO26262

Supporting up to ASIL-B

Overvoltage and reverse polarity protection up to ±18V

Small 14-TSSOP package

The ZMID520x Evaluation Kit is designed for sensor module evaluation,

laboratory setup, and module calibration development for

the ZMID520x Family of Inductive Position Sensor ICs.

 ZMID5201: analog interface

 ZMID5202: PWM interface

 ZMID5203: SENT interface

ZMID5202典型应用:

 Rotary position sensors up to 360°; e.g. steering angle sensors, potentiometer replacement

 Small-angle sensors or arc-motion sensors; e.g. pedal, vehicle level, or valve sensors

 Linear motion sensors; e.g. linear-actuator position sensors, fluid-level sensors

图1.ZMID5202功能框图

主要框图包括:

 Power management: power-on-reset (POR) circuit, low drop-out (LDO) regulators for internal supplies

 Oscillator: generation of the transmit coil signal

 Analog front-end: demodulator and gain control for the receive signals

 Analog-to-digital converter (ADC): conversion into digital domain

 Digital signal processing: offset correction, conversion of sine and cosine signals into angle and magnitude, angle range adjustment, linearization, etc.

 EEPROM: nonvolatile storage of factory and user-programmable settings

 One-wire interface (OWI): programming of the chip through the output pin

 Interface options:

— Analog output for ZMID5201

— PWM output for ZMID5202

— SENT output for ZMID5203

 Protection: overvoltage, reverse polarity , short circuit protection

 Test control: factory testing; connect TEST_D and TEST_ENA pins

图2.ZMID5202应用电路

评估板ZMID520x EVK

The main purpose of the ZMID520x Evaluation Kit is communicationbetween the user’s computer and the ZMID520x. The computersends commands and data via its USB port to the ZMIDCommunication Board.

The microcontroller on the Communication Board interprets thesecommands and relays them to the ZMID520x located on theZMID520x Demo Board using the one-wire interface (OWI) communicationinterface.

The microcontroller also forwards data bytes from the ZMID520xback to the computer via the USB connection. These bytes canbe sensor readings, raw analog-to-digital converter (ADC) datafrom analog outputs, or ZMID520x EEPROM contents.

The ZMID520x AID EVK Application Software is a graphical userinterface (GUI) is provided online for the kit. It supports allZMID520x configurations and enables the user to intuitivelyunderstand the functionality of the ZMID520x as well asperforming measurements.

The ZMID520x Evaluation Kit is designed for sensor module evaluation,laboratory setup, and module calibration development forthe ZMID520x Family of Inductive Position Sensor ICs.

 ZMID5201: analog interface

 ZMID5202: PWM interface

 ZMID5203: SENT interface

The main purpose of the ZMID520x Evaluation Kit is communicationbetween the user’s computer and the ZMID520x. The computersends commands and data via its USB port to the ZMIDCommunication Board.

The microcontroller on the Communication Board interprets thesecommands and relays them to the ZMID520x located on theZMID520x Demo Board using the one-wire interface (OWI) communicationinterface.

评估板ZMID520x EVK主要特性:

 USB “plug and play” – no driver installation needed

 Small ZMID Communication Board: 5cm  8cm

 One-wire communication interface (OWI) enables quick andeasy configuration and calibration of the ZMID520x using theuser’s computer

 PWM, analog or SENT reading of the output depending onproduct

 The design allows easy swapping of ZMID520x Demo Boards

 Ability to connect and evaluate an external module board

— No external power supply needed

— External module is supplied from the ZMID520x DemoBoard

评估板ZMID520x EVK包括:

 ZMID520x Demo Board with printed sensor coil

 ZMID Communication Board