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U6268B Datasheet

  • U6268B

  • Side-Airbag Sensor Dual Interface

  • 12頁

  • TEMIC

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U6268B
Side-Airbag Sensor Dual Interface
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
TTL-compatible input activate the sensor
D
Data output can be directly connected to a micro-
controller input
D
Receives data from the sensors by current modulation
with a transmission rate of 60 kBaud (transmission
bandwidth 500 kHz)
D
Operation supply voltage range 5.7 V
method 3015.7
v
V
v
40 V
S
D
ESD protection according to MIL-STD-883C test
D
High-level EMI protection
D
Current modulation provides high noise immunity for
data transfer
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
I/U converter
Smoothed voltage
regulator
Channel 1
power
supply
Data
trans鈥?/div>
mission
Crash
sensor
碌
C
Enable
Channel 2
Data
Channel 1
Channel 2
Temperature
monitor
Short circuit
detection
Channel 2
power
supply
Data
trans鈥?/div>
mission
Smoothed voltage
regulator
Voltage
comparator
I/U converter
Crash
sensor
13839
Figure 1. Block diagram
TELEFUNKEN Semiconductors
Rev. A1, 21-May-97
1 (12)
Preliminary Information

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