Automotive Power Product Brief TLE 7729

Product Brief
TLE 7729
4 Channel Airbag Satellite Receiver IC
SatRIC TM
Embedded Diagnostic Functions
T h e T L E 7 7 2 9 – SatRICTM - is a highly integrated interface IC specially
designed for automotive restraint applications. The device, located in the ECU
■
Leakage detection to GND and Battery
(Electronic Control Unit) of the airbag system, is able to receive data from different
■
Ground loss detection
types of intelligent sensors like inertia and pressure sensor satellites for front-,
■
Short to GND and open detection at every
reference pins
side-, or rear-crash sensor applications. It provides a pre-regulated power supply
voltage to the satellites over a twisted pair of wires. The satellite module transmits
digital data to TLE 7729 by modulating the line current.
VCC
6
VSYNC12
28
VBUS12
1
VBUS34
14
22 SATREF12
Power Supply
&
Control
IREF 23
Applications
■
VSYNC34
15
20 SATREF34
VSYNCxy
Automotive Restraint Applications
VBUSCxy
SATFD1 - Driver
Features
4 independent satellite receiver channels for current modulated data
■
Each channel can support up to two satellites with
6 V/11 V
SATFD1 27
a total of up to eight sensors
Data rate 125 kBaud
■
Support of 11-, 13-, 18-Bit Manchester 1 or 2 encoded messages
■
Channel configuration in pairs (Bus Mode, Protocol Type)
■
Supply of satellite channels via 4 independent voltage regulators
■
Adjustable current level detection thresholds
■
Asynchronous and synchronous data transmission modes
■
All digital I/Os are 3.3 V and 5 V compatible
■
4 Digital outputs for voltage-converted received satellite signals
■
16-bit 8 MHz Serial Peripheral Interface (SPI)
■
Embedded protocol handler for data preprocessing
■
Small P-TSSOP-28 Package
Embedded Protection Functions
■
Current limitation in case of satellite output shorted to GND or Battery
■
Channel specific over-temperature shutdown
www.infineon.com/restraint-system-IC
Automotive Power
18 SATSYNC
11 RxD3
4 RxD2
25 RxD1
Logic
Data
■
8 CLK
Protocol
Handler
&
Control
Logic
SATFD2 2
Control
■
24 RIN
Sense
&
Control
SATFD 2 - Driver
9 MOSI
SATFD3 13
SPI
Interface
SATFD 3 - Driver
5 MISO
19 CS
10 SCK
SATFD4 16
SATFD 4 - Driver
TLE 7729
7
21
26
AGND DGND N.C.
Start
Bits
Sensor
Status
CRC
Communication Status
Channel
Address
P
17
N.C.
System
Status
3
N.C.
12
TEST
Sensor Data
Protocol Handler
Receiver Data
HW Status
Product Brief
Application Examples (Side Impact)
B-pillar
g
p
p
Airbag ECU
Right Doors
b1
c1
b2
F
a1
F
Airbag
ECU
a2
F
b3
c2
b4
F
ax: up-front sensors (acceleration)
bx: pressure sensors in doors
cx: acceleration sensor in B-pillar
Line 1
Line 2
Line 3
SatRICTM
(TLE7729)
SYNC
MCU
SPI
Line 4
Left Doors
p
p
g
B-pillar
Product Summary
Type
Sales Code
Description
Package
TLE 7729
Available upon request
4 Channel Satellite Receiver
P-TSSOP-28
System Overview
Pedestrian Protection
Bonnet
Passenger Sensing
High Speed CAN
Airbag ECU
Safing
Engine
(XC866)
TLE 7729
SatRICTM
ER
Buck
Buck
TLE7714
TLE7734
4 Loop
Safing Signals
CrosSave
Buck
Buckle
Switch
VBAT
VSAT & VSYNC
I/O
VLOGIC
Published by
Infineon Technologies AG
81726 Munich, Germany
© Infineon Technologies AG 2006.
All Rights Reserved.
Legal Disclaimer
The information given in this Product Brief shall in no event be
regarded as a guarantee of conditions or characteristics
(“Beschaffenheitsgarantie”). With respect to any examples or hints
given herein, any typical values stated herein and/or any information regarding the application of the device, Infineon Technologies
hereby disclaims any and all warranties and liabilities of any kind,
including without limitation warranties of non-infringement of
intellectual property rights of any third party.
Information
For further information on technology, delivery terms and
conditions and prices please contact your nearest
Infineon Technologies Office (www.infineon.com).
Published by Infineon Technologies AG
Buckle
Switch
TM
VBOOST
How to reach us:
http://www.infineon.com
Doors
Front Airbag
TLE 6711
Battery
Curtains
CrosSaveTM
g
x
g
g
y
TLE7718
TLE7738
8 Loop
Passenger
DualStage
p
Left Door
XC164
MCU
Smart Power
Switch
Occupant
DualStage
g
Sensor SPI
TLE 7729
SatRICTM
p
Front Impact
Side Airbag
TLE 7259
LIN
TLE 6250
CAN
Firing SPI
Side Impact
Right Door
p
p
g
Warning Lamp
Airbag Off
Warnings
Due to technical requirements components may contain
dangerous substances. For information on the types in question
please contact your nearest Infineon Technologies Office.
Infineon Technologies Components may only be used in lifesupport devices or systems with the express written approval
of Infineon Technologies, if a failure of such components can
reasonably be expected to cause the failure of that life-support
device or system, or to affect the safety or effectiveness of that
device or system.
Life support devices or systems are intended to be implanted in
the human body, or to support and/or maintain and sustain
and/or protect human life. If they fail, it is reasonable to assume
that the health of the user or other persons may be endangered.
Ordering No. B112-H8941-X-X-7600
Printed in Germany
PS 1106.5 nb