L9679P datasheet(267/272 Pages) STMICROELECTRONICS

No. de pieza	L9679P

Descripción Electrónicos	Automotive advanced airbag IC for mid/high end applications

PDF	272 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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267 / 272 page

DocID029275 Rev 1

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L9679P

Quality information

271

Quality information

18.1

OTP memory

The device contains a 128-bits One-Time Programmable memory. This OTP memory is

used for the following purposes:

86 bits data + 3 bits CRC for critical parameters trimming: bandgaps, oscillators,

reference currents, firing currents, DC sensor and RSU interface parameters.

18 bits data for other blocks trimming: ADC, ER Cap Measurement

20 bits data for die and wafer traceability

1 bit for debug purpose

User read/write access to the OTP memory via SPI is only possible during production

testing and require activation of a special test mode.

During mission mode, the trimming bits are automatically read from OTP and transferred to

the related circuits at each POR cycle. During this operation, actual CRC of the protected

trimming data is calculated and checked against the expected CRC stored in the OTP. In

case of CRC check failure the OTPCRC_ERR flag is set in the FLTSR register.

L9679P Datasheet(PDF) 267 Page - STMicroelectronics