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PDF TLE6712 Data sheet ( Hoja de datos )
| Número de pieza | TLE6712 | |
| Descripción | Dual Firing Airbag IC | |
| Fabricantes | Infineon Technologies | |
| Logotipo |  |
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Dual Firing Airbag IC
Data Sheet
TLE 6712
1 Overview
1.1 Features
• Two independent squib channels each consisting of
a high- side & a low-side switch
• Thermal and short circuit protection for each switch
• Current limitation for each firing loop
• Firing current detection
P-DSO-24-1
• Voltage measurements
• Squib leakage detection to ground and to battery
• Precise squib resistance measurement with programmable gain
• Multiplexed analog output pin for measurement retrieval
• Unidirectional Serial Peripheral Interface (SPI)
• Security circuits and independent input signals included to prevent unwanted firing
1.2 Functional Description
This IC provides four independent actuator channels for firing loops in an safety restraint
airbag system. Each channel is equipped with full diagnostic functions. Communication
between the µC and Dual Firing Airbag IC is be performed via SPI and analog/digital
interface pins.
Type
TLE 6712
Ordering Code
on request
1
Package
P-DSO-24-1
V 1.61 2001-07-13
1 page  
1.5 Block Diagram
TLE 6712
6
DI
CLK 7
CSN 8
9
RI
VCC5 VCHP
19 14
V B oost
16
SPI
Block
SEN 4
FEN 20
Firing
Control
Block
Internal
Supply
Block
Squib
Driver 1
24 FV12
23 SQH1
22 SQL1
21 GNDL1
10
MO
MUX
Output
Block
TLE 6712
Dual Firing
Airbag IC
17
VS
GND 18
Measurement
Block
5 15
MSR MCA
Squib
Driver 2
1 SQH2
2 SQL2
3 GNDL2
AEB02726
Figure 2 Block Diagram TLE 6712
Company Confidential
5
V 1.61 2001-07-13
5 Page 
TLE 6712
For the third measurement bit b3 must be set to 0 and b2 to 0 (gain of OpAmp 1 is set to
A1 = 10) or bit 3 to 0 and bit 2 to 1 (gain A1 = 30).The OpAmp 1 now reports the voltage
drop across the squib including the offset voltage to the MO pin.
III) VMO2 = VMO1 – IMain × RSquib × A1
VIO1 offset voltage of OpAmp 1
A1 gain of OpAmp 1 (10 or 30)
Now the µC measures the sum of IBias and IMain.
IV) VMSR2 = (I Main + IBias ) × RMSR
With the result of these four measurements the µC is able to calculate the precise
resistance of the squib with the following equations:
Transforming equation III) to RSquib:
V)
RSquib
=
-V-----M-----O-----1---–-----V-----M-----O-----2-
A1 × IMain
Transforming equation IV) to IMain:
VI)
IMain
=
V------M-----S----R----2--
RMSR
–IBias
Combining equation V) and VI) gives:
VII)
RSquib
=
-----------V-----M-----O-----1----–----V-----M-----O-----2------------
A1 × èçæV--R----M--M---S--S--R--R--2-- –IBias÷ö
Company Confidential
11
V 1.61 2001-07-13
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TLE6712.PDF ] | |
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