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Bosch Semiconductors

SMA684

Satellite sensor for airbag systems

Application & Technical Summary

SMA6xy

The SMA684 is a versatile high-g accelerometer for automotive passive safety systems and detects the deceleration of a vehicle. It is typically used in satellite sensors to sense front and side crashes.

The SMA684 communicates via a PSI5 v1.3. All sensor data is processed by the central airbag ECU, which recognizes a crash based on acceleration data and activates the respective airbags. The sensor is developed in accordance to ISO26262 for ASIL D system use.

Product benefits

  • Complies with VDA AK-LV 27 specification
  • Robustness against microcuts
  • Triggerable offset adjustment
  • RoHS compliant

Target application

  • Satellite sensors

reliable operation

due to broad operating temperature range

Technical Features

Type
Single axis high-g acceleration sensor
Package
SOIC8n
Sensing axes
Z
Range
±120/240 g
Interface
PSI5 (PAS)
Data resolution
10-bit
Sensitivity
4/2 LSB/g
Tolerance
±7%
Supply voltage
4.5 to 11 V
Supply current
< 6 mA (sink current 26 mA)
Operating temperature
-40°C to 125°C

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