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PDF TLE6714 Data sheet ( Hoja de datos )
| Número de pieza | TLE6714 | |
| Descripción | Quad Firing Airbag IC | |
| Fabricantes | Infineon Technologies | |
| Logotipo |  |
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Quad Firing Airbag IC
Data Sheet
TLE 6714
1 Overview
1.1 Features
• Four 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-28-1
• 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 Quad Firing Airbag IC is be performed via SPI and analog/digital
interface pins.
Type
TLE 6714
Ordering Code
on request
1
Package
P-DSO-28-1
V 1.61 2001-07-13
1 page  
1.5 Block Diagram
TLE 6714
6
DI
CLK 7
8
CSN
RI 9
VCC5 VCHP
23 18
V B oost
20
SPI
Block
Squib
Driver 1
28 FV12
27 SQH1
26 SQL1
25 GNDL1
4
SEN
24
FEN
Firing
Control
Block
10
MO
MUX
Output
Block
Internal
Supply
Block
TLE 6714
Quad Firing
Airbag IC
Squib
Driver 2
Squib
Driver 3
1 SQH2
2 SQL2
3 GNDL2
14 FV34
13 SQH3
12 SQL3
11 GNDL3
21
VS
GND 22
Measurement
Block
5 19
MSR MCA
Squib
Driver 4
15 SQH4
16 SQL4
17 GNDL4
AEB02616
Figure 2 Block Diagram TLE 6714
5
V 1.61 2001-07-13
5 Page 
TLE 6714
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
Transfoming 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
11 V 1.61 2001-07-13
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TLE6714.PDF ] | |
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