E910.56 Datasheet, PDF (1/2 Pages) ELMOS Semiconductor AG – FlexRay™ Star Coupler

ßßDRIVENßBY
FlexRay™ Star Coupler
E910.56
Features
Brief Functional Description
ÿ Part of the FlexRay™ electrical, physical layer
ÿ Active star coupler connects up to 4 branches
(FlexRay™ busses) to nodes or other active stars
ÿ Support of data rates up to 10 Mbit/s
ÿ Optional support of low power mode for an ECU
ÿ Remote wake up via bus line
ÿ Enhanced diagnosis capability provided via SPI
with interrupt generation
ÿ Protection against overload damage by current
limitation and overtemperature detection
ÿ Bus driver outputs withstand - 27 V / + 40 V DC
voltage
ÿ Low EME due to balanced differential transmission
The star coupler is part of the electrical, physical layer
in a FlexRay™ communication network. The E910.56
provides interfaces to connect up to four branches of
twisted pair physical bus lines to other bus drivers or
star couplers. It also interfaces with a communication
controller (CC) and a µC. Via SPI the bus driver (BD) pro-
vides status information concerning failure detection
on the bus lines (e.g. short circuit, ground loss) and
overtemperature condition to a host controller (HOST).
An interrupt signal is generated whenever the failure
status changes.
The device supports normal and standby modes and
provides remote wake up capability via bus line. The
output (INH) can be used to control an external vol-
tage regulator.
Applications
ÿ Star coupler and additionally usable as transceiver
in FlexRay™ nodes (ECUs)
ELMOS is member of the FlexRay consortium
Typical Application
Microcontroller
(HOST)
VBAT
Power
Supply
ECU 1
4 ^{Communication}
Controller
Local
Wakeup
TxEN TxD RxD
VIO VCC INH
SPI
TRXD1
Bus Driver
INTN
TRXD2
E910.56
LWU
VBUF
BP_1 BM_1 BP_2 BM_2 BP_3 BM_3 BP_4 BM_4
to additional
stars
GND
ELMOS Semiconductor AG
Blockdiagram
SCSN
SCK
SDI
SDO
INTN
RxD
TxD
TxEN
Host Interface
(SPI + Interrupt)
Communication
Controller Interface
Central
Logic
INH
LWU
Inhibit & Wake
VBAT
VCC
VIO
Power
Supply
Undervolt.
POR
Monitor
5V Regulator ^Overtemp.
Vref
Monitor
GND
Single_Branch_1
Bus Failure
Detector_1
Transmitter_1
Receiver_1
Wake up
Detector_1
Single_Branch_2
....
Single_Branch_3
....
Single_Branch_4
....
Star Transmitter &
Receiver
BP_1
BM_1
BP_2
BM_2
BP_3
BM_3
BP_4
BM_4
TRXD1
TRXD2
VBUF
E910.56
October 2007