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L9678P Datasheet(PDF) 197 Page - STMicroelectronics |
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L9678P Datasheet(HTML) 197 Page - STMicroelectronics |
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197 / 203 page ![]() DocID029274 Rev 3 197/203 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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