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L9678P Folha de dados(PDF) 197 Page - STMicroelectronics

Nome de Peças L9678P
Descrição Electrónicos  Automotive user configurable airbag IC
PDF  203 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9678P Folha de dados(HTML) 197 Page - STMicroelectronics

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L9678P, L9678P-S
Quality information
202
16
Quality information
16.1
OTP trim bits
The device has 43 fuse programmable bits which are used to tune and refine performance
characteristics of the device and also provide detailed identification of each component.
These bits are only available during production testing and require activation of a special
test mode. These bit values are confirmed every transition from POR, and reported in
Section 5.1.1: Fault status register (FLTSR) if an error is found.
The OTP CRC is implemented using the polynomial calculation (g(x)=1+x+x^3 with
initialization value equal to "111").
Equivalent equations are:
CRC[2] =
C0in + C1in + C2in + d1 + d11 + d12 + d13 + d15 + d18 + d19 + d20 + d22 + d25 + d26
+ d27 + d29 + d32 + d33 + d34 + d36 + d39 + d4 + d40 + d41 + d5 + d6 + d8
CRC[1] =
C0in + C1in + d0 + d12 + d13 + d14 + d16 + d19 + d2 + d20 + d21 + d23 + d26 + d27 +
d28 + d30 + d33 + d34 + d35 + d37 + d40 + d41 + d42 + d5 + d6 + d7 + d9
CRC[0] =
C1in + C2in + d0 + d10 + d11 + d12 + d14 + d17 + d18 + d19 + d21 + d24 + d25 + d26
+ d28 + d3 + d31 + d32 + d33 + d35 + d38 + d39 + d4 + d40 + d42 + d5 + d7
where d[42:0] are the 43 OTP bits and Cxin are the starting seed values (all '1').



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