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Atmel Electronic Components Datasheet

U6268B Datasheet

Side-airbag Sensor Dual Interface

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Features
Two Identical Interface Channels
Pre-regulated Smoothed Voltage and a Supply Current up to 50 mA for the Sensors
Data from the Sensors by Current Modulation with a Transmission Rate of 60 kBaud
(Transmission Bandwidth 500 kHz)
TTL-compatible Input Activates the Sensor
Data Output Can be Directly Connected to a Microcontroller Input
Operation Supply Voltage Range 5.7V VS 40V
ESD Protection According to MIL-STD-883C Test Method 3015.7
High-level EMI Protection
Benefits
Simple Wiring Thanks to One Common Line for Supply of the Sensor and Data
Transmission from the Sensor to the U6268B
Current Modulation Provides High Noise Immunity for Data Transfer
Side-airbag
Sensor Dual
Interface
U6268B
1. Description
The U6268B is an interface IC for remote automotive sensors. It links the crash sen-
sors 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-
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regulated smoothed voltage, the external units transmit the digital information back to
the interface by current modulation.
As the device is designed for safety-critical applications, the highest data transmission
security is mandatory. With high immunity against cross coupling between the two
channels, the U6268B is tailored for the harsh automotive environment.
Figure 1-1. Block Diagram
Data
Channel 1
Enable
Voltage
comparator
Channel 1
Channel 2
Enable
Channel 2
Data
Voltage
comparator
I/V converter
Smoothed voltage
regulator
Temperature Short circuit
monitor
detection
Smoothed voltage
regulator
I/V converter
Channel 1
power
supply
Data
trans-
mission
Crash
sensor
Channel 2
power
supply
Data
trans-
mission
Crash
sensor
Rev. 4808B–AUTO–09/05


Atmel Electronic Components Datasheet

U6268B Datasheet

Side-airbag Sensor Dual Interface

No Preview Available !

2. Pin Configuration
Figure 2-1. Pinning SO16
GND 1
RETURN1 2
OUT1 3
VS 4
OUT2 5
SC 6
RETURN2 7
GND 8
16 GND
15 ENABLE1
14 CLL1
13 OCM1
12 OCM2
11 CLL2
10 ENABLE2
9 GND
Table 2-1.
Pin
1
2
3
4
5
6
7
8, 9
10
11
12
13
14
15
16
Pin Description
Symbol Function
GND
Ground and reference pin
RETURN1 Return line of the external unit, internally connected to GND via a line-protection transistor
OUT1 Voltage-stabilized supply output and current-modulation input
VS Supply voltage of the IC
OUT2 Voltage-stabilized supply output and current-modulation input
SC Smooth time constant for slow voltage change at both OUT pins
RETURN2 Return line of the external unit, internally connected to GND via a line-protection transistor
GND
Ground and reference pin
ENABLE2
Controls OUT1 voltage
ENABLE1 High = OUT1 active, ENABLE1 Low or open = OUT1 switched off
CLL2
Current logic level output (low at high OUT2 current, monitoring via OCM2)
OCM2 Analog current output, representing 1/10 current of OUT2
OCM1 Analog current output, representing 1/10 current of OUT1
CLL1
Current logic level output (low at high OUT1 current, monitoring via OCM1)
ENABLE1
Controls OUT2 voltage
ENABLE2 High = OUT2 active, ENABLE1 Low or open = OUT2 switched off
GND
Ground and reference pin
2 U6268B
4808B–AUTO–09/05


Part Number U6268B
Description Side-airbag Sensor Dual Interface
Maker ATMEL Corporation
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U6268B Datasheet PDF






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