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L9678P Datasheet(PDF) 207 Page - STMicroelectronics

Part # L9678P
Description  Automotive user configurable airbag and battery cut-off IC
PDF  215 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9678P Datasheet(HTML) 207 Page - STMicroelectronics

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DS11626 Rev 9
207/216
L9678P, L9678P-S
Quality information
214
17
Quality information
17.1
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 5.2.1: 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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