E981.07 Datasheet, PDF (26/46 Pages) ELMOS Semiconductor AG – Two independent operating channels

Two Channel Sensor Interface PSI5
ADVANCE PRODUCT INFORMATION JUL 26, 2011
5.2.4 SPI Timing
Figure 5.2-3 shows the SPI timing diagram.
CSB
90%
10%
t
SCK
t
lead
t
SCKH
t
SCKL
t
t
fall
rise
SCK
90%
10%
MISO
90%
10%
MOSI
90%
10%
t
a
t
v
MSB
t
t
su
hi
MSB
t_{MISO_lag}
Figure 5.2-3: SPI Timing Diagram
E981.07
t
td
t
CSB_lag
t
t
dis
t
LSB
t
LSB
t
5.2.5 SPI Message Format
The 981.07 supports two message types: a sensor related message type which is used to retrieve data from the
connected sensors and another message type for non sensor requests like configuration and control
information. The message type is defined by the bit 13 (SEN) in the MOSI request frame. The sequence
identifier (SQx) bits are only used by the MCU for controlling purposes. The transmitted SQx bits are sent back
by MISO during the following SPI-protocol.
ELMOS Semiconductor AG
Data Sheet 26 / 45
QM-No.: 25DS0050E.00
This document contains information on a new product. ELMOS Semiconductor AG reserves the right to change specifications and information herein without notice.