BMA145

BMA145 Datasheet


BMA145 Triaxial, analog acceDlBaeMtaArs1ha4e5ettion sensorBosch Sensortec Data sheet

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BMA145 BMA145 BMA145 (pdf)
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BMA145-SHUTL BMA145-SHUTL BMA145-SHUTL
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BMA145 Triaxial, analog acceDlBaeMtaArs1ha4e5ettion sensorBosch Sensortec Data sheet

BMA145 Data sheet

Device order code
0 273 141 027

Package type
16-pin LGA

Release date
11 February 2010

Document number

BST-BMA145-DS000-03

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as copying and passing on to third parties. BPOrSoCpHriaentdarthyeisnyfmobroml bBloisccahtGiomnb.H, Germany.

Note Specifications within this document are subject to change without notice.

BMA145 Data sheet

Bosch Sensortec

BMA145 triaxial, analog 4g analog accelerometer

Key features
- Triaxial, ±4g full scale accelerometer - Standard LGA package with 4mm x 4mm footprint, 0.9mm height - 2 operation modes Stand-by- and normal mode - Ultra-low power consumption:
- 200uA in operation mode - 0.7uA in stand-by mode - Only 1 msec. turn-on time form stand-by mode to operation mode - Analog output signals 3 parallel X, Y, Z plus 1 serial multiplexed X, Y, Z - Internal 1.5kHz 1st-order low-pass analog filter - Customizable corner frequency - On-chip gain and offset compensation, calibrated on factory level. - Trigger-able self-test capability of MEMS sensor element and ASIC - RoHS compliant, halogen-free - Based on automotive-proven Bosch MEMS wafer-fabrication technology & processes

Tilt, motion and vibration sensing in - Gaming - Virtual reality - Sports- and life style wear - Cell-phones - Handhelds, PDAs, PNDs - Healthcare - Patient monitoring - Navigation - Electronic compass compensation - Computer peripherals - Man-machine interfaces

Page 2 / proprietary information
11 February 2010

Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note Specifications within this document are subject to change without notice.

BMA145 Data sheet

Bosch Sensortec

THE BMA145 IN GENERAL

The BMA145 is a triaxial low-g acceleration sensor for consumer market applications, available in a standard SMD LGA package with a footprint of 4mm x 4mm and a height of only 0.9mm. It allows measurements of static as well as dynamic accelerations. Due to its three perpendicular axes it gives the absolute orientation in a gravity field and enables free-fall detection. As all other Bosch inertial sensors, the BMA145 is a two-chip arrangement, which combines an application-specific integrated circuit ASIC with a three-channel silicon accelerometer, to form a true micro electro mechanical system MEMS .

The ASIC evaluates the output of the acceleration-sensing element, corresponding to the differential capacitance principle. The underlying MEMS technology processes have proven their capability according to the strictest automotive standards in more than 100 million Bosch inertial sensors a year so far.

The BMA145 provides 3 parallel analog output signals in a 4g acceleration range. All acceleration signals are permanently available on 3 independent analog pads through resistors on each pad. This allows the user defining the signal bandwidth by the mean of external capacitors connected between each channel output and ground. Additional to the parallel X, Y and Z output signals there is the option to multiplex any axis to 1 supplementary output pin in a freely customized manner. This allows the user to connect the triaxial BMA145 to an economical single channel AD converter without loss of axis information.

For each axis, an independent analog kHz 1st-order low-pass filter is included to provide preconditioning of the measured acceleration signal. The corner frequency of this filter can easily be customized. Additional signal preconditioning steps are performed by a digital to analog converter for offset and gain correction purposes with a subsequent signal amplification. The output signals are ratiometric. In the ±4g acceleration range the sensor is offering a sensitivity of 300mV/g at V supply voltage VDD / 10 and as a typical noise level.

The typical current consumption is 200uA in operation mode. Furthermore, the sensor can be switched into a standby mode via supplementary selection pins. In standby mode the sensor module features an ultra low current consumption of typically uA. The return from standby mode to full performance conditions is performed in less than 1ms wake up time.

The BMA145 sensor module is ready to use due to test and calibration at factory level. All calibration parameters, e.g. for offset and sensitivity, are stored in an internal EEPROM. The sensor also features full self-test capability for all three axes. It is activated via a single self test activation pin which results in a physical deflection of the seismic mass in the sensing element due to electrostatic forces. Thus, it provides full contact and functional testing of the complete signal evaluation path including the MEMS acceleration-sensing element and the evaluation ASIC.

Page 3 / proprietary information
11 February 2010

Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note Specifications within this document are subject to change without notice.

BMA145 Data sheet

Bosch Sensortec

CONTENT
2 ABSOLUTE MAXIMUM
3 BMA145 9
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Datasheet ID: BMA145 521991