BMA120 Digital, triaxial acceleration sensor Bosch Sensortec General description The BMA120 is a triaxial, low-g acceleration sensor The BMA 120 is highly con gurable in order to give with digital interfaces, aiming for low-power consumer the designer full exibility when integrating the sensor market applications. into his system. All features can be set by software via The BMA120 allows measurement of accelerations in the digital interface. 3 perpendicular axes. An evaluation circuitry converts As already introduced with the successful BMA150 the output of a three-channel micromechanical accele- and SMB380 acceleration sensors, also for the ration sensing structure that works according to the BMA120 g-ranges and bandwidths can be user pro- differential capacitance principle. grammed via the serial digital interface. Here the user 2 The BMA120 senses tilt, motion, shock and vibration can choose between an I C and an SPI (3-wire/4-wire) in cell phones, handhelds, computer peripherals, interface modes. man-machine interfaces, virtual reality features and One of the key elements of the BMA120 is the intelli- game controllers. gent interrupt engine that gives the hard- and software designer full control. Various motion detection scena- BMA120 target applications rios can be identi ed by the BMA120 and signaled to f Display pro le switching (e.g. portrait / landscape) the system via a simple interrupt pin. By using the f Tap / Double-tap function digital serial interface, the exact details of the motion f Menu scrolling event that triggered the interrupt can be read-out from f Gaming the BMA120. f Advanced power management for mobile devices f Drop protection for warranty logging Technical data BMA120 f Shock detection f Pedometer / step counting Sensitivity axes x/y/z Measurement range 2g, 4g, 8g, 16g Sensor operation (switchable via SPI / IC) The BMA120 represents a new generation of digital Sensitivity 2g: 16LSB/g acceleration sensors. The BMA120 integrates a multi- (calibrated) 4g: 8LSB/g tude of features that facilitates its use especially in 8g: 4LSB/g the area of motion detection applications, such as 16g: 2LSB/g device orientation detection, gaming, HMI and menu Resolution 6bit > 62.5mg (2g range) browser control. Nonlinearity 2% FS Zero-g offset 100 mg (typ.) Bandwidth 50Hz, 75Hz, 150Hz, Key features BMA120 f User programmable g-range and bandwidth 250Hz, 600Hz, 1kHz f Low-power consumption (switchable via SPI / IC) f SPI (3-wire / 4-wire) and IC interface Digital input/output SPI & IC, interrupt pin f User programmable interrupt engine Supply voltage 1.8V (10%) f Ultra-low-power self-wake-up mode (V / V ) DD DDIO f Very small package Temperature range -20C +70C f RoHS compliant, halogen-free LGA package 3 mm x 3 mm x 0.9 mm2 Bosch Sensortec BMA120 Pin con guration (top view) Following motion detection scenarios are supported Pin 1 by the interrupt engine: CAPY identi er f Any-motion (slope) detection 12 f Tap sensing 1 11 CAPZ CAPX f Orientation change recognition f Low-g / high-g detection VDD VDDD 2 10 BMA120 f Data-ready top view GND SDX 3 9 (pads not visible) f Self-wake-up INT 4 8 SDO The interrupts can be con gured by the user and thus CSB 5 7 SCX perfectly support the integration of the BMA120 into 6 the users system environment. PS Another important feature of the BMA120 acceleration sensor is the power management module. This modu- le allows for optimizing the sensors power consump- Pin Name Function tion in-line with the speci c user requirements. Thus, No. it is not necessary to operate the sensor at full power for all application scenarios all the time. For some 1 CAPX Do not connect (recommended) uses cases the power consumption drastically shrinks 2V Power supply analog DD to just a fraction of what would be required in full 3 GND Shared ground performance mode. 4INT Interrupt output The power modes the BMA120 supports are: 5 CSB SPI chip-select 6 PS Protocol select pin 2 7SCL I C(SCL) / SPC(SCK) serial clock Mode Wake-up Current SCK time consumption 8 SDO SPI serial data output 1.8 V V DD 2 9SDA, I C / SPI serial data in/out Power-off only 1 ms 0 A SDI, Suspend 400 s 1 A (typ.) SDO Low-power (sleep) 400 s 2 A (typ.) 10 V Power supply digital DDD Full performance 430 A 11 CAPZ Do not connect (recommended) 12 CAPY Do not connect (recommended) 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. 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 Speci cation subject to change without notice Doc.-Number: BST-BMA120-FL000-00 / Version 1.1 102009 Bosch Sensortec GmbH reserves all rights 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 symbols are registered trademarks of Robert Bosch GmbH, Germany.