E981.08 Datasheet, PDF (1/47 Pages) ELMOS Semiconductor AG – Four independent operating channels

Four Channel Sensor Interface PSI5
ADVANCE PRODUCT INFORMATION - JUL 26, 2011
E981.08
Features
General Description
 Four independent operating channels
The circuit was developed to manage the connection
 Device parameters comply with
and communication between a microcontroller unit
PSI5-P10P-500/3L (PSI5 spec 1.3)
(MCU) and up to twelve sensor satellites. It can be
 Applicable for parallel and universal mode
applied for example in a vehicle passenger restraint
(standard) as well, as daisy chain mode
system. The device provide two independently
(increased)
operating channels. Every channel manages the

Channel output short circuit protected against 40V ^{communication with a maximum of three sensor}
and GND.
satellites.
 Channel output short circuit protected against
every other channel.
 Current detection with adapted current threshold
 Data Manchester coded
 Operation with supply voltages of 5V and 3.3V
typical
 SPI interface
 Over current switch off for every channel
 Temperature switch off for every channel
Each channel supplies the connected sensor devices
with a regulated DC voltage, which is derived from an
external source. The sensor data are extracted by
measuring the current, modulated by the connected
sensor devices, supplied by the regulator and
communicated to the MCU via SPI interface. The
current threshold is adapted to the quiescent current
of the system. The data bits are coded using a
Manchester format. The device operates with an
external 4MHz/8MHz clock.
Typical Application
SATFD1
SPI
GND
MCU
4
981.08
SAT_SYNC
Sensor1
SATFD2
GND
Sensor2 Sensor3
Sensor1 Sensor2 Sensor3
ELMOS Semiconductor AG
Data Sheet 1 / 46
QM-No.: 25DS0051E.00
This document contains information on a new product. ELMOS Semiconductor AG reserves the right to change specifications and information herein without notice.