TLE6712

Product Brief
TLE 6712G
2 Loop Firing IC
T h e T L E 6 7 1 2 G is a 2 loop firing IC specially designed for automotive
restraint applications. The device, located in the ECU (Electronic Control Unit) of
the airbag system, provides two independent actuator channels for firing loops.
Each channel is equipped with various diagnostic functions. Communication
between the µC and TLE 6712G is performed via SPI and analog/digital interface pins.
Applications
■
Automotive Restraint Applications
VCC5
Features
■
2 independent firing loops (each with Highside and Lowside Switch)
■
Extra HW lines (safety lines) to enable firing
■
Firing current detection
■
Multiplexed analog output pin for measurement retrieval
■
Unidirectional Serial Peripheral Interface (SPI) up to 4 MHz
µC
Embedded Protection Functions
■
Current limitation for each firing loop
■
Thermal and short circuit protection for each switch
6
DI
7
CLK
8
CSN
9
RI
SeN
FeN
MO
Embedded Diagnostic Functions
■
Squib Resistance Measurement with programmable gain
■
Leakage detection to GND and Battery
■
Measurement of internal and external voltages
4
20
10
VCC5
19
VBoost
16
SPI
Block
24 FV12
23 SQh1
Firing
Control
Block
Internal
Supply
Block
Squib
Driver 1
MUX
Output
Block
TLE 67 1 2
2 Loop Firing IC
Squib
Driver 2
Measurement
Block
GND 18
5
MSR
15
MCA
5 kΩ
Squib1
22 SQL1
21 GNDL1
1 SQh2
VS 17
µC
Automotive Power
VChP
14
BAT
50 Ω
www.infineon.com/restraint-system-IC
VBAT
2 SQL2
3 GNDL2
Squib2
Product Brief
Diagnostic Examples (Resistance & Leakage Measurement)
15 to 33 V
VBoost 16
IMCA
VBoost 16
CStore
SPI Command
6XXXh
Saving
Sensor
IMain = M x IMCA
M = 16, 32 or 40 FV12SS
SPI Command
4XXXh and
6XXXh
IBias = 5 x IMCA
high Side
ON/OFF
OpAmp1
OpAmp1
IMCA
MCA 15
RMCA
4-6 kΩ
OpAmp
high
3/4 x VS
Squib
GNDLx
OpAmp1
MO
5 MSR
OpAmp2
RMSR
50 Ω
OpAmp1
OpAmp
Low
MCA 15
RMCA
4-6 kΩ
A2 = 2
ILL R
LL
SQLx
Low Side
OFF
Squib
GNDLx
Window Comparator
with digital and three
state output
VMO
VS/3
10
Saving
Sensor
RS
RSquib
ILh = IMCA
2-5
kΩ
RSquib
SQLx
MUX
VCC5
SQhx
VS
RLh ILh
OpAmp1
VS/2
Low
Side
OFF
8V
high Side
OFF
SQhx
A1 = 10 or 30
OpAmp3
Saving
Sensor
S
FV12 S
ILL = IMCA
VS/2
Saving
Sensor
RS
Buckle
Switch
VBAT
CStore
15 to 33 V VBAT
VCC5
10
VS
MO
MSR
5
RMSR
50 Ω
1/4 x VS
Product Summary
Type
Sales Code
Description
Package
TLE 6712G
Available upon request
2 Loop Firing IC
P-DSO-24-1
System Overview
Pedestrian Protection
Bonnet
Passenger Sensing
high Speed CAN
Airbag ECU
eR
VBAT
OS
VSAT
VLogic
TLe 6365
Buck
Buck
Published by
Infineon Technologies AG
81726 Munich, Germany
© Infineon Technologies AG 2006.
All Rights Reserved.
SPI
Boost
ISO 9141
Doors
4 Loop
Buckle
Switch
I/O
Buckle
Switch
AWL
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
Curtains
Front Airbag
TLe 6710
VBoost
How to reach us:
http://www.infineon.com
TLe 6714
4L-SPI
TLe 6712
2L-SPI
C164
MCU
e2P
Side Airbag
Passenger
DualStage
TLe 7719
SatRICTM
Smart Power
Switch
Occupant
DualStage
Pressure
Sensors
Side Impact
Battery
TLe 6259
LIN
Sensor SPI
TLe 7719
SatRICTM
TLe 6250
CAN
Firing SPI
Acceleration
Sensors
Front &
Rear Impact
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. B152-H8516-X-X-7600
Printed in Germany
PS 1106.5 nb