A1351中文资料带推/拉脉冲调宽控制输出的高精度线性霍尔效应传感器 IC数据手册Allegro规格书

描述 Description

This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available.

Date of status change: April 30, 2012.

Recommended substitution: For existing customer transition, and for new customers or new applications, contact Allegro Sales.

The A1351 device is a high precision, programmable linear Hall-effect sensor IC with a pulse width modulated (PWM) output. The duty cycle (DC) of the PWM output signal is proportional to an applied magnetic field. The A1351 device converts an analog signal from its internal Hall sensor element to a digitally encoded PWM output signal. The coupled noise immunity of the digitally encoded PWM output is far superior to the noise immunity of an analog output signal. A simple RC network can be used to convert the digital PWM signal back to analog signal.

The BiCMOS, monolithic circuit inside of the A1351 integrates a Hall element, precision temperature-compensating circuitry to reduce the intrinsic sensitivity and offset drift of the Hall element, a small-signal high-gain amplifier, proprietary dynamic offset cancellation circuits, and PWM conversion circuitry. The dynamic offset cancellation circuits reduce the residual offset voltage of the Hall element. Hall element offset is normally caused by device over molding, temperature dependencies, and thermal stress. The high frequency offset cancellation (chopping) clock allows for a greater sampling rate, which increases the accuracy of the output signal and results in faster signal processing capability.

An internal filter of approximately 150 Hz is used to achieve 11 bits of output resolution.

Key applications for the A1351 include battery current sensing, exhaust gas return (EGR), throttle position, ride height and seat belt tensioning systems.

特性 Features

• Pulse width modulated (PWM) output provides increased noise immunity compared to an analog output
• 1 mm case thickness provides greater coupling for current sensing applications
• Push/pull output
• Customer-programmable offset and sensitivity
• Factory-programmed 0%/°C Sensitivity Temperature Coefficient
• Programmability at end-of-line
• Selectable unipolar or bipolar quiescent duty cycles
• Selectable sensitivity range between 0.055% and 0.095% DC/G
• Temperature-stable quiescent duty cycle output and sensitivity
• Precise recoverability after temperature cycling
• Output duty cycle clamps provide short circuit diagnostic capabilities
• Optional 50% DC calibration test mode at device power-up
• Wide ambient temperature range: –40°C to 125°C
• Resistant to mechanical stress

简介

A1351属于传感器变送器的磁性传感器-线性罗盘（IC）。由制造生产的A1351磁性传感器 - 线性，罗盘（IC）该系列产品可用于将磁场强度作为一个可变数量进行测量，而相比之下，类似产品仅检测是否存在强度超过某个限值的磁场。常见的应用包括测量地球磁场，以类似于传统罗盘的方式进行定向，市面上的一些器件允许以相对于磁场的物理方向直接读取测量值。