L9680 datasheet(272/277 Pages) STMICROELECTRONICS

Part #	L9680

Description	Automotive advanced airbag IC for mid/high end applications

PDF	277 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

272 / 277 page

Quality information

L9680

272/277

DocID029257 Rev 1

Quality information

17.1

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.

L9680 Datasheet(PDF) 272 Page - STMicroelectronics