Datasheet > TLE4941-2C

TLE4941-2C

更新时间： 2022-12-12 03:37:05

品牌	Logo	应用领域
英飞凌 - INFINEON		传感器
页数	文件大小	规格书
8页	744K
描述
Differential Two-Wire Hall Effect Sensor IC

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数据手册

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TLE4941-2C 数据手册

TLE4941-2, TLE4941-2C Supplement

Functional description

= peak detection

offset= (max + min) / 2

correction

offset

initial

settling

time

PGA

switching

phase shift change

uncalibrated mode

calibrated mode

Fig. 1: example for startup behaviour

Uncalibrated mode:

Occasionally a short initial offset settling time t_d,inputmight delay the detection of the

input signal. (The sensor is "blind").

The magnetic input signal is tracked by the speed ADC and monitored within the

digital circuit. For detection the signal transient needs to exceed a threshold (digital

noise constant d1). When the signal slope is identified as a rising edge (or falling

edge), a trigger pulse is issued to a comparator. A second trigger pulse is issued as

soon as a falling edge (or rising edge respectively) is detected (and vice versa).

Depending on the initial state of the comparator the IC output is first triggerd on the

first or second detected edge.

Between the start-up of the magnetic input signal and the time when its second

extreme is reached, the PGA (programmable gain amplifier) will switch to its

appropriate position. This value is determined by the signal amplitude and initial

offset value. The digital noise constant value is changing accordingly (d1 ® d2,

related to the corresponding PGA states), leading to a change in phase shift between

magnetic input signal and output signal. After that consecutive output edges should

have a nominal delay of about 180°. In rare cases one further switching of PGA can

occur (see appendix B).

During the uncalibrated mode the offset value is calculated by the peak detection

algorithm as described in the TLE 4941 data sheet.

TLE4941-2 - TLE4941-2C

Datasheet supplement

February 2002

123 4 5 6 7 8

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