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Bosch Semiconductors

SMA660

Central sensor for airbag control units

Application & Technical Summary

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The SMA660 is a versatile high-g accelerometer for automotive passive safety systems and detects the deceleration of a vehicle. It is typically used as central sensor in the airbag electronic control unit (ECU).

The SMA660 communicates via a bi-directional digital 32-bit SPI. It allows Bosch SPI or open SPI standards with 12-bit resolution of acceleration data. All sensor data is processed by the central airbag ECU, which recognizes a crash based on the 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

  • Airbag ECUs

reliable operation

due to broad operating temperature range

Technical Features

Type
Dual axis high-g acceleration sensor
Package
SOIC8n
Sensing axes
X, Y
Range
±120 g
Interface
SPI (ECU)
Data resolution
12-bit
Sensitivity
16 LSB/g
Tolerance
±5%
Supply voltage
3.3, 5.0 or 6.7 V
Supply current
< 6 mA
Operating temperature
-40°C to 105°C

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