E981.07 Datasheet, PDF (23/46 Pages) ELMOS Semiconductor AG – Two independent operating channels

Two Channel Sensor Interface PSI5
ADVANCE PRODUCT INFORMATION JUL 26, 2011
E981.07
V
SAT_OUT_X_SYNC
T
SYNC
t
Slot
t
Gap
t
EMC
V
SAT_OUT_X
t
t
Slot1
t
Slot2
t
Slot3
t
Slot3
Start
Start
Start
End
Figure 5.1-6 Timing for Synchronous Parallel Bus Mode (PSI5-P10P-500/3L)
5.1.8 Daisy chain bus mode (PSI5-D10P-500/3L)
The device is able to operate in Daisy chain bus configuration . In this configuration the sensors are connected
in series (see figure 6.3/4). The chain contains switches, which can be used for auto addressing of the sensors.
Because of a possible voltage drop, via the switches, it is recommended to program the device output voltage to
8V.
5.1.9 Bidirectional communication
In the above mentioned operating modes, it is possible to communicate, not only from sensor to ECU, but also
from ECU to sensor. The communication from MCU to RSU is made using a specifiec sync-pattern (please
refer to PSI-5 spec.) The sync-pattern is made using the SPI-command SYNC_ENABLE which allows masking
the SYNC pulse independently on each SATFD output.
ELMOS Semiconductor AG
Data Sheet 23 / 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.