E981.07 Datasheet, PDF (18/46 Pages) ELMOS Semiconductor AG – Two independent operating channels

Two Channel Sensor Interface PSI5
ADVANCE PRODUCT INFORMATION JUL 26, 2011
5 Functional Description
5.1 RSU Interface
E981.07
VSYNC
VBUS
Data
comparator
Regulator
Adaptive
threshold
Temp.
shut-off
Sync-pulse
control and discharge
SATFDX
Figure 5.1-1 Satellite Interface Block Diagram
5.1.1 Functional Description
Each of the four RSU interfaces provides a regulated voltage to the connected satellite sensor. The interfaces
are short circuit protected to 40V and GND. The four interfaces operate independently. Distortion on one
channel will not effect the operation of the others.
The RSU interfaces can be activated and deactivated independently via an SPI command. Because enabling a
channel results an in-rush current on the line, any time a channel is activated, a startup delay counter is started.
During this entire delay time tSAT_OC_SDEL the Manchester Decoder, the sync pulse generation and the over-current
detection for the particular channel are disabled. When the startup delay counter expires, the channel enters its
normal operating mode.
5.1.2 Voltage Regulation
The voltage regulator provides 2 different voltage settings: In the “standard” mode, the regulator provides 6.5V.
This mode is intended to be used for universal ana parallel configuration. In “increased” mode the regulator
provides an 8V supply. This mode is intended to be used for daisy-chain configuration. The selection is done by
the SPI-command “LINE_SUPPLY_MODE”.
ELMOS Semiconductor AG
Data Sheet 18 / 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.