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PDF U6268B Data sheet ( Hoja de datos )
| Número de pieza | U6268B | |
| Descripción | Side-Airbag Sensor Dual Interface | |
| Fabricantes | TEMIC Semiconductors | |
| Logotipo |  |
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Side-Airbag Sensor Dual Interface
U6268B
Description
The U6268B is an interface IC for remote automotive
sensors. It links the crash sensors in the driver- and
passenger door with the main airbag unit in the
dashboard. Two identical channels supply the external
sensors and receive digital information from them via one
active wire each. The interface supplies the external
sensors with a pre-regulated smoothed voltage, the
external units transmit the digital information back to the
interface by current modulation.
As the device is for safety critical applications, highest
data transmission security is mandatory. With high
immunity against cross-coupling between the two
channels, the U6228B is tailored for the harsh automotive
environment.
Features
D Two identical interface channels
D Provides a pre-regulated smoothed voltage and a
supply current up to 50 mA for the sensors
D Receives data from the sensors by current modulation
with a transmission rate of 60 kBaud (transmission
bandwidth 500 kHz)
D Current modulation provides high noise immunity for
data transfer
D TTL-compatible input activate the sensor
D Data output can be directly connected to a micro-
controller input
v vD Operation supply voltage range 5.7 V VS 40 V
D ESD protection according to MIL-STD-883C test
method 3015.7
D High-level EMI protection
Benefits
D Voltage supply and data transmission with one active
wire over long distances
Ordering Information
Extended Type Number
U6268B
Package
SO16
Remarks
Block Diagram
Data
Channel 1
Enable
Voltage
comparator
µC Channel 1
Channel 2
Enable
Channel 2
Data
Voltage
comparator
I/U converter
Smoothed voltage
regulator
Temperature Short circuit
monitor
detection
Smoothed voltage
regulator
I/U converter
Figure 1. Block diagram
Channel 1
power
supply
Data
trans–
mission
Crash
sensor
Channel 2
power
supply
Data
trans–
mission
Crash
sensor
13839
TELEFUNKEN Semiconductors
Rev. A1, 21-May-97
Preliminary Information
1 (12)
1 page  
U6268B
Absolute Maximum Ratings
Parameters
Supply voltage
Voltage at pins CLL1, CLL2, ENABLE1, ENABLE2
Voltage at SC
Voltage at OCM1, OCM2
Voltage at RETURN1, RETURN2
Voltage at OUT1, OUT2
Current at supply
(both channels OUTx and RETURNx shorted)
Current at logical pins: CLL1, CLL2
ENABLE1, ENABLE2
Current at SC (SC related to GND or VBatt)
Current at pins to external unit
OUT1, OUT2, RETURN1, RETURN2
ESD classification
WHuman body model (100 pF, 1.5 k )
WMachine model (200 pF, 0.0 )
Ambient temperature range
Junction temperature range
Storage temperature range
Symbol
VS
VSC
VOCMx
VRETURNx
VOUTx
IS
Min.
–0.6
–0.3
–0.3
–0.3
–1
–1
ICCLx
IENABLEx
ISC
All pins
Tamb
Tj
Tstg
–110
internal
limited
"2000
"200
–40
–40
–55
Typ.
Max.
40
6
30
6.8
27
40
240
3
0.1
220
95
150
125
Unit
V
V
V
V
V
V
mA
mA
mA
mA
V
V
°C
°C
°C
Thermal Resistance
Parameters
Junction to pin
Junction ambient is reachable with a big pad size for
GND near a screw or the metal housing
Symbol
RthJC
RthJA
Value
36
65
Unit
k/W
k/W
Electrical Characteristics
Tamb = –40 to 95°C and Tj = –40 to 150°C,
v voperation supply voltage range 5.7 to 18 V continuously, 25 V for max. 25 min, 40 V for up to 500 ms.
WThe current values are based on the 750 0% resistor at OCM1/OCM2
Parameters
wSupply current
Tj 125°C
Function SC
Test Conditions / Pins
vOutputs disabled, VS 18 V
vOutputs disabled, VS 40 V
vOne output enabled, VS 18 V
vBoth outputs enabled, VS 18 V
vOutput load 2 15 mA, VS 18 V
vOutput load 2 28 mA, VS 18 V
vOutput load 2 50 mA, VS 18 V
vOutput load 2 60 mA,
VS 18 V (Tj > 125°C)
vBoth channels OUTx and
RETURNx shorted, VS 18 V
Symbol
IS
IS
IS
IS
IS
IS
IS
IS
IS
Min. Typ. Max. Unit
8 mA
14 mA
13 mA
18 mA
56 mA
90 mA
146 mA
171 mA
200 mA
TELEFUNKEN Semiconductors
Rev. A1, 21-May-97
Preliminary Information
5 (12)
5 Page 
Package Information
Package SO16
Dimensions in mm
10.0
9.85
0.4
1.27
16
8.89
U6268B
1.4
0.25
0.10
9
5.2
4.8
3.7
3.8
6.15
5.85
0.2
technical drawings
according to DIN
specifications
13036
18
TELEFUNKEN Semiconductors
Rev. A1, 21-May-97
Preliminary Information
11 (12)
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet U6268B.PDF ] | |
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