L9679P datasheet(272/279 Pages) STMICROELECTRONICS

Part #	L9679P

Description	Automotive advanced airbag for mid/high end applications and cut-off battery IC

PDF	279 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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272 / 279 page

Quality information

L9679P

272/279

DS11627 Rev 7

Quality information

19.1

OTP memory

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

for the following purposes:

1. 86 bits data + 3 bits CRC for critical parameters trimming: bandgaps, oscillators,

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

2. 18 bits data for other blocks trimming: ADC, ER Cap Measurement

3. 20 bits data for die and wafer traceability

4. 1 bit for debug purpose

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

testing and requires 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) 272 Page - STMicroelectronics