Triaxial acceleration sensor
SMB380
Bosch Sensortec
General description
The SMB380 is a triaxial low-g acceleration sensor with
digital output for consumer market applications. It allows
measurements of accelerations in perpendicular axes.
An evaluation circuitry converts the output of a threechannel micromechanical acceleration-sensing structure
that works according to the differential capacitance
principle.
The base of the micromachining technology has proven
its capability in more than 100 million Bosch accelerometers and gyroscopes so far. The modular ASIC design
provides a flexibility to react quickly to customer needs
Key features SMB380
4 Switchable g-range and bandwidth
4 Low-power ASIC
4 SPI (3-wire / 4-wire) / I2C interface
4 Programmable interrupt feature for mobile
wake-up or free-fall detection
4 Ultra-low-power self-wake-up mode
4 Full selftest capability
4 Absolute temperature output
4 QFN package (footprint 3 mm x 3 mm,
height 0.9 mm)
4 RoHS compliance
for additional sensor functionality in the future.
The SMB380 package and interface have been defined
to match a multitude of hardware requirements. The sen
sor comes with ultra-low-power capabilities, a small foot-
Technical data
Triaxial acceleration sensor – SMB380
Thus, it is attractive for mobile applications. Furthermore, the sensor has a flexible on-chip logic which can be
programmed to evaluate motion profiles autonomously.
The SMB380 senses tilt, motion and shock vibration in cell
phones, handhelds, computer peripherals, man-machine
interfaces, virtual reality features and game controllers.
Applications based on acceleration sensing
4 Advanced system power management for mobile
applications
4 HDD protection
4 Drop protection for warranty logging
4 Menu scrolling, tap-tap function
4 Pedometer
4 Display profile switching
4 Shock detection
4 Gaming
x / y / z
Measurement range
±2 g, ±4 g, ±8 g
(switchable via SPI / I2C)
Sensitivity (calibrated)
2 g: 256 LSB / g;
4 g: 128 LSB/g ;
8 g:
Resolution
10 bit => 4 mg (±2 g)
Nonlinearity
±0.5 % FS
Axis Mixing
1 %
0g-Offset (calibrated)
print (3 mm x 3 mm) and a flat package (0.9 mm height).
Sensitivity axes
±40 mg
Offset temperature drift
2 mg / K
Noise
0.5 mg / √Hz
Bandwidth
25 Hz – 1500 Hz
(switchable via SPI / I2C)
Digital input/ output
SPI / I2C, Interrupt pin
64 LSB/g
Supply voltage VDD / VDDIO 2.4 – 3.6 V / 1.8 – 3.6 V
Current consumption
200 µA
Idle current
1 µA
Wake-up time
1 ms
Temperature range
-40°C … - 85°C
