BMA120 BOSCH | Alldatasheet
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Digital, triaxial acceleration sensor General description The BMA120 is a triaxial, low-g acceleration sensor with digital interfaces, aiming for low-power consumer market applications. The BMA120 allows measurement of accelerations in 3 perpendicular axes. An evaluation circuitry converts the output of a three-channel micromechanical accele- ration sensing structure that works according to the differential capacitance principle. The BMA120 senses tilt, motion, shock and vibration in cell phones, handhelds, computer peripherals, man-machine interfaces, virtual reality features and game controllers. BMA120 target applications Display profi le switching (e.g. portrait / landscape) f Tap / Double-tap function f Menu scrolling f Gaming f Advanced power management for mobile devices f Drop protection for warranty logging f Shock detection f Pedometer / step counting f Sensor operation The BMA120 represents a new generation of digital acceleration sensors. The BMA120 integrates a multi- tude of features that facilitates its use especially in the area of motion detection applications, such as device orientation detection, gaming, HMI and menu browser control. The BMA 120 is highly confi gurable in order to give the designer full fl exibility when integrating the sensor into his system. All features can be set by software via the digital interface. As already introduced with the successful BMA150 and SMB380 acceleration sensors, also for the BMA120 g-ranges and bandwidths can be user pro- grammed via the serial digital interface. Here the user can choose between an I 2C and an SPI (3-wire/4-wire) interface modes. One of the key elements of the BMA120 is the intelli- gent interrupt engine that gives the hard- and software designer full control. Various motion detection scena- rios can be identifi ed by the BMA120 and signaled to the system via a simple interrupt pin. By using the digital serial interface, the exact details of the motion event that triggered the interrupt can be read-out from the BMA120. Technical data BMA120 Sensitivity axes Measurement range Sensitivity (calibrated) Resolution Nonlinearity Zero-g offset Bandwidth Digital input/output Supply voltage DD / VDDIO ) Temperature range LGA package x/y/z (switchable via SPI / I²C) 2g: 16LSB/g 4g: 8LSB/g 8g: 4LSB/g 16g: 2LSB/g 6bit >62.5mg (±2g range) ±2% FS ±100 mg (typ.) 50Hz, 75Hz, 150Hz, 250Hz, 600Hz, 1kHz (switchable via SPI / I²C) SPI & I²C, interrupt pin 1.8V (±10%) -20°C … +70°C 3 mm x 3 mm x 0.9 mm Key features BMA120 User programmable g-range and bandwidth f Low-power consumption f SPI (3-wire / 4-wire) and I²C interface f User programmable interrupt engine f Ultra-low-power self-wake-up mode f Very small package f RoHS compliant, halogen-free f
© Bosch Sensortec GmbH reserves all rights in the event of industrial property rights. We reserve all rights of disposal such a s copying and passing on to third parties. BOSCH and the symbols are registered trademarks of Robert Bosch GmbH, Germany. Specifi cation subject to change without notice Doc.-Number: BST-BMA120-FL000-00 / Version_1.1_102009 Bosch Sensortec2 Headquarters Bosch Sensortec GmbH Gerhard-Kindler-Strasse 8
72770 Reutlingen · Germany
Telephone +49 7121 3535 900 Fax +49 7121 3535 909 contact@bosch-sensortec.com www.bosch-sensortec.com Following motion detection scenarios are supported by the interrupt engine: Any-motion (slope) detection f Tap sensing f Orientation change recognition f Low-g / high-g detection f Data-ready f Self-wake-up f The interrupts can be confi gured by the user and thus perfectly support the integration of the BMA120 into the user’s system environment. Another important feature of the BMA120 acceleration sensor is the power management module. This modu- le allows for optimizing the sensor’s power consump- tion in-line with the specifi c user requirements. Thus, it is not necessary to operate the sensor at full power for all application scenarios all the time. For some uses cases the power consumption drastically shrinks to just a fraction of what would be required in full performance mode. The power modes the BMA120 supports are: The BMA120 also features self-test capability, allowing for testing of the complete signal evaluation path including the micromachined sensor structure and the evaluation ASIC. Pin No. Name Function 1 CAPX Do not connect! (recommended) 2V DD Power supply analog
3 GND Shared ground
4I N T I n t e r r u p t o u t p u t
5 CSB SPI chip-select
6 PS Protocol select pin
I 2C(SCL) / SPC(SCK) serial clock
8 SDO SPI serial data output
9S D A , SDI, SDO I2C / SPI serial data in/out
10 V DDD Power supply digital
11 CAPZ Do not connect! (recommended) 12 CAPY Do not connect! (recommended) 111 102 Pin 1 identifi er BMA120 top view (pads not visible) CAPY PS CAPZ VDDD SDX SDO SCX CAPX CSB VDD GND INT Mode Wake-up time Current consumption @ 1.8 V VDD Power-off only 1 ms 0 µA Suspend ≤ 400 µs 1 µA (typ.) Low-power (sleep) ≤ 400 µs 2 µA (typ.) Full performance – 430 µA Pin confi guration (top view)