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AS5170 датащи(PDF) 32 Page - ams AG

номер детали AS5170
подробное описание детали  Accurate angle measurement
PDF  47 Pages
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производитель  AMSCO [ams AG]
домашняя страница  http://www.ams.com
Logo AMSCO - ams AG

AS5170 датащи(HTML) 32 Page - ams AG

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Page 32
ams Datasheet
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[v1-01] 2016-Apr-11
AS5170 − Application Information
Signature Calculation
The OTP of AS5170A and AS5170B uses a BIST technique with
Multiple Input Signature Register circuits.
To activate this BIST a calculation of the Signature Byte is
necessary and has to store into the OTP during the
programming sequence.
For calculating the signature byte the content of the whole
memory (0x02 to 0x1D) has to be read.
Out of this information the following calculation has to be done.
Byte: 0x02 = data2
….
Byte: 0x1D = data29
Unsigned int signature (unsigned int * content)
{
unsigned int misr,misr_shift,misr_xor,misr_msb;
misr = 0;
for (int i=0; i<28; i++) {
misr_shift = (misr<<1);
misr_xor = (misr_shift ^ content[i])%256;
misr_msb = misr/(128);
if (misr_msb == 0)
misr = misr_xor;
else
misr = (misr_xor ^ 29)%256;
}
return misr;
}
content= {,data2,data3,data4,data5,data6,
data7,data8,data9,data10,data11,
data12,data13,data14,data15,data16,
data17,data18,data19,data20,data21,data22,
data23,data24,data25,data26,data27,data28,data29};
Application Information



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