L9678P datasheet(140/203 Pages) STMICROELECTRONICS

поискавой системы для электроныых деталей

L9678P датащи(PDF) 140 Page - STMicroelectronics

номер детали	L9678P

подробное описание детали	Automotive user configurable airbag IC

PDF	203 Pages

Scroll/Zoom	100%

производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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140 / 203 page

Safing logic

L9678P, L9678P-S

140/203

DocID029274 Rev 3

10.2

SPI sensor data decoding

Sensor data is regularly communicated with the main microcontroller through multiple SPI

messages. Since not all communications between sensors and the microcontroller contain

data, it is important for the decoder to properly sort the communications and extract only the

targeted data. The solution involves defining specific masking functions, contained within

independent safing records, programmed by the user. The following figures detail the SPI

message decoding methodology and the ensuing comparisons of valid sensor data to the

programmed thresholds.

Figure 40. Safing engine - 16-bit message decoding flow chart

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