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HAL855UT-A 参数 Datasheet PDF下载

HAL855UT-A图片预览
型号: HAL855UT-A
PDF下载: 下载PDF文件 查看货源
内容描述: 可编程线性霍尔效应传感器与任意输出特性 [Programmable Linear Hall-Effect Sensor with Arbitrary Output Characteristic]
分类和应用: 传感器
文件页数/大小: 42 页 / 2158 K
品牌: MICRONAS [ MICRONAS ]
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DATA SHEET  
HAL855  
Output Bittime  
Slope  
The OUTPUT BITTIME register defines the bit time of  
the Biphase-M output signal. OUTPUT BITTIME is  
“sub”-register of the SPECIAL CUSTOMER register.  
The SLOPE register contains the parameter for the  
multiplier in the DSP. The Slope is programmable  
between 4 and 4. The register can be changed in  
steps of 0.00049. Slope = 1 corresponds to an  
increase of the output signal by 100% if the digital  
value at the A/D-converter output increases by 2048.  
Table 2–5: OUTPUT BITTIME register definition  
For all calculations, the digital value after the digital  
signal processing is used. This digital information is  
readable from the DIGITAL OUTPUT register.  
Biphase-M Output Bit Time Bit Setting  
40 μs  
0
84 µs  
1
Shift  
168 µs  
320 µs  
700 µs  
1.6 ms  
3.2 ms  
6.4 ms  
2
The SHIFT register contains the parameter for the  
adder in the DSP. Shift is the output signal without  
external magnetic field (B = 0 mT) and programmable  
from 100% up to 100%. For calibration in the system  
environment, a 2-point adjustment procedure is rec-  
ommended. The suitable Slope and Shift values for  
each sensor can be calculated individually by this pro-  
cedure.  
3
11  
4
5
7
Part Number  
In case of Biphase-M output, a part number can be  
defined. This part number will be sent during power-on  
of the sensor if the PARTNUMBER ENABLE bit is set.  
Afterwards, the sensor will send the digital value corre-  
sponding to the applied magnetic field.  
Note: Setting the Biphase-M bit time to 40 μs simulta-  
neously switches the programming telegram to  
the same bit time. Hence after writing the  
OUTPUT BITTIME register the timing of the pro-  
gramming device has to be set accordingly.  
– The PARTNUMBER ENABLE bit is part of the  
SPECIAL CUSTOMER register.  
– The OUTPUT PERIOD register defines the time  
interval for which the part number is sent.  
TC and TCSQ  
The temperature dependence of the magnetic sensitiv-  
ity can be adapted to different magnetic materials in  
order to compensate for the change of the magnetic  
strength with temperature. The adaption is done by  
programming the TC (Linear Temperature Coefficient)  
and the TCSQ registers (Quadratic Temperature Coef-  
ficient). Thereby, the slope and the curvature of the  
temperature dependence of the magnetic sensitivity  
can be matched to the magnet and the sensor assem-  
bly. As a result, the output signal characteristic can be  
fixed over the full temperature range. The sensor can  
compensate for linear temperature coefficients ranging  
from about 2100 ppm/K up to 600 ppm/K and qua-  
dratic coefficients from about 5 ppm/K2 to 5 ppm/K2.  
Please refer to Section 4.4. on page 28 for the recom-  
mended settings for different linear temperature coeffi-  
cients.  
Output Characteristic  
The OUTPUT CHARACTERISTIC register defines the  
shape of the sensor output signal. It consists of  
32 setpoints. Each setpoint can be set to values  
between 0 and 511 LSB. The output characteristic has  
to be monotonic increasing (Setpoint0 Setpoint1  
SetpointN).  
LOCKR  
By setting this 1-bit register, all registers will be locked,  
and the sensor will no longer respond to any supply  
voltage modulation. This bit is active after the first  
power-off and power-on sequence after setting the  
LOCK bit.  
Warning: This register cannot be reset!  
Micronas  
Nov. 26, 2008; DSH000149_003EN  
11