BMA145-SHUTL

BMA145 BMA145 Data sheet Triaxial, analog acceleration sensor Bosch Sensortec Data sheet BMA145 Data sheet Device order code 0 273 141 027 Package type 16-pin LGA Data sheet revision 1.3 Release date 11 February 2010 Document number BST-BMA145-DS000-03 Notes Rev. 1.3 Specifications are subject to change without notice. Page 1 /photos proprietary information 11 February 2010 Product and pictures are for illustration purposes only and may differ product’s appearance. © Bosch Sensortec GmbH reserves all rights even from in the the eventreal of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. BOSCH and the information symbol are registered Robert Bosch GmbH, Germany. Proprietary – nottrademarks intendedoffor publication. 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: - 200μA in operation mode - 0.7μA 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 Typical applications 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 Rev. 1.3 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 33kΩ 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 1.5 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 3.0 V supply voltage (VDD / 10) and 175μg/√Hz as a typical noise level. The typical current consumption is 200μA 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 0.7 μA. 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. Rev. 1.3 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 1 SPECIFICATION................................................................................................................................... 6 2 ABSOLUTE MAXIMUM RATINGS........................................................................................................8 3 BMA145 FEATURES............................................................................................................................ 9 3.1 GENERAL DESCRIPTION .................................................................................................................. 9 3.1.1 MEMS element ....................................................................................................................... 9 3.1.2 ASIC........................................................................................................................................ 9 3.2 CHANNEL MULTIPLEXER ................................................................................................................ 10 4 OPERATION ....................................................................................................................................... 11 4.1 POWER-ON-RESET AND POWER-UP SEQUENCE ............................................................................... 11 4.2 OPERATION MODE SELECTION ....................................................................................................... 11 4.3 CHANNEL MULTIPLEXER OUTPUT SELECTION .................................................................................. 11 4.4 ANALOG OUTPUT ON AX, AY AND AZ .............................................................................................. 12 4.5 SELF TEST................................................................................................................................... 12 4.6 POLARITY OF THE ACCELERATION OUTPUT ..................................................................................... 14 4.7 PIN CONFIGURATION (TOP VIEW, PADS NOT VISIBLE)........................................................................ 15 4.8 CONNECTING DIAGRAM ................................................................................................................. 16 4.8.1 Full feature operation............................................................................................................ 16 4.8.2 Simple 3-channel operation.................................................................................................. 16 4.8.3 Customizing bandwidth and noise........................................................................................ 17 4.9 HANDLING INSTRUCTION ............................................................................................................... 17 5 PACKAGE .......................................................................................................................................... 18 5.1 OUTLINE DIMENSIONS ................................................................................................................... 18 5.2 PRINTED CIRCUIT BOARD (PCB) DESIGN ........................................................................................ 19 5.3 MARKING .................................................................................................................................... 20 5.3.1 Mass production samples..................................................................................................... 20 5.3.2 Engineering samples ............................................................................................................ 20 5.4 MOISTURE SENSITIVITY LEVEL AND SOLDERING ............................................................................... 21 5.5 TAPE AND REEL SPECIFICATION ..................................................................................................... 22 5.5.1 Orientation ............................................................................................................................ 23 5.6 ROHS COMPLIANCY ..................................................................................................................... 24 5.7 HALOGEN CONTENT ..................................................................................................................... 24 5.8 NOTE ON INTERNAL PACKAGE STRUCTURE ..................................................................................... 24 Rev. 1.3 Page 4 / 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 6 7 Bosch Sensortec LEGAL DISCLAIMER......................................................................................................................... 25 6.1 ENGINEERING SAMPLES ................................................................................................................ 25 6.2 PRODUCT USE ............................................................................................................................. 25 6.3 APPLICATION EXAMPLES AND HINTS ............................................................................................... 25 DOCUMENT HISTORY AND MODIFICATION .................................................................................. 26 Rev. 1.3 Page 5 / 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 1 Bosch Sensortec Specification If not stated otherwise, the given values are maximum values over lifetime and are valid for the specified temperature and voltage ranges. Min./max. values represent 3-sigma limits. Operating range Parameter Symbol Condition Acceleration range gFS4g ±4g Supply voltage VDD Digital input low level VIL for TEST, ST, SEL.0 and SEL.1 Digital input high level VIH for TEST, ST, SEL.0 and SEL.1 Supply current in normal mode IDD analog and digital 200 Supply current in stand-by mode IDDsbm analog and digital 0.7 Operating temperature TA Min Max Units 4 1.8 full performance Typ 3.0 g 3.5 V 0.2 * VDD V V 0.8 * VDD -40 290 μA μA +85 °C Output signal Unless stated otherwise output signals are for operation at ±4g range, VDD = 3.0 V and T = 25ºC Parameter Zero-g voltage Zero-g voltage temperature drift Sensitivity Symbol Off TCO S Condition VDD = 3.0V Min 1.455 Typ 1.500 Max 1.545 Units V -150 0 +150 mg 1.8V ≤ VDD ≤ 3.5V VDD / 2 V -40°C  TA  +85°C ±1 mg/K VDD = 3.0V 0.288 0.300 0.312 1.8V ≤ VDD ≤ 3.5V -4% VDD / 10 +4% V/g Bandwidth 1st order filter f-3dB with 1nF connected to Ax, Ay, Az 1.500 kHz Non-linearity NL best fit straight line ±0.5 %FS Self test response TST triggerable via ST pin Output noise nrms rms Rev. 1.3 Page 6 / proprietary information 0.25 (x,y) 0.5 (z) 175 g µg / Hz 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 Sensor performance and operating conditions Parameter Start-Up time1 Tst_up Condition with 1nF connected to Ax, Ay, Az Wake-Up time2 Tw_up Output resistance Pull-down resistance Maximal load on AMUX Symbol Min Typ Max Units 3 ms with 1nF connected to Ax, Ay, Az 1 ms Rx, Ry, Rz On chip 33 kΩ Rpulldown on ST and TEST pad 20 kΩ CL 25 pF Max Units Mechanical trait Parameter Cross axis sensitivity Alignment error Symbol S δa Condition relative contribution between 3 axes Min relative to package outline Typ 0.2 FS% ±0.5 ° 1 The start-up time is the total duration between application of the voltage supply and obtaining analog signals on the three channels with less than 1% (of full scale) error between signal and respective asymptotic values. 2 The wake-up time is the total duration between transiting from stand-by to normal mode and obtaining analog signals on the three channels with less than 1% (of full scale) error between signal and respective asymptotic values. Rev. 1.3 Page 7 / 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 2 Bosch Sensortec Absolute maximum ratings Parameter Extended supply voltage Condition / Symbol VDD_ext 0°C to 85°C Min 1.72 Max 3.55 Units V VDD_Limit -0.3 3.60 V Pad voltage Vpad Vss-0.3 Vdd+0.3 V Storage temperature Tstore -50 +150 °C duration ≤ 100μs 10,000 g duration ≤ 500μs 5,000 g duration ≤ 1.0ms 3,000 g free fall onto hard surfaces 1.5 m HBM 2.0 kV CDM 500 V Supply voltage limit Mechanical shock ESD Rev. 1.3 Page 8 / 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 3 Bosch Sensortec BMA145 features 3.1 General description The BMA145 is a fully calibrated, triaxial low-g analog acceleration sensor. It allows measurements of static as well as dynamic accelerations in all three dimensions. Due to its three perpendicular axes it gives the absolute orientation in a gravity field and enables free-fall detection. The sensor is set up as a two-chip arrangement consisting of a three-channel capacity differential MEMS acceleration-sensing element and an application specific integrated circuit (ASIC). Both parts are embedded in a standard, surface mountable land grid array package (LGA). In the following, the LGA packed two-chip arrangement is defined as sensor module. The accelerometer features a low-pass characteristic, with a bandwidth limited to 1.5 kHz (nominal value). This value can further be reduced using external capacitors to improve or customize noise level. It is advised to reduce bandwidth to minimum value required in the application. The bandwidth of all output pins can be selected by the value of the capacitors connected to the Ax, Ay and Az output. Each channel behaves like an independent low-pass RC filter, given by the internal 33kΩ resistor and the external capacitor. The resulting RC low pass filter on Ax, Ay an Az is also valid for the multiplexer output pin. Do not connect an additional external capacitor on the multiplexer output pin. Refer to chapter 4.8 for details. 3.1.1 MEMS element The production of the sensing element is based on standard semiconductor- and standard MEMS processes. The main steps are layer deposition, layer masking and layer structuring in a technology cycle, similar to the standard semiconductor manufacturing. In detail, the process cycle starts with the deposition of a thick epitaxial layer on a sacrificial oxide. The large thickness allows the design of working capacitances of up to 1pF. The poly-layer is patterned by deep reactive ion etching in an inductively coupled plasma (DRIE-ICP, the so-called Bosch process). A large aspect ratio and a very high anisotropy is achieved by periodic passivation of the side walls in between the etch intervals. Afterwards the sacrificial layer is removed. The sensing element is hermetically sealed by a bulk micromachined cap to prevent damages of the structure by dicing, packaging and operation of the device. 3.1.2 ASIC The ASIC is produced in a standard CMOS process. It evaluates, corrects and amplifies the output signal of the MEMS acceleration-sensing element. Simplified considered, the ASIC consists mainly out of 3 capacity voltage converters and 3 signal conditioners, a channel multiplexer, a digital to analog converter an EEPROM memory and an internal RC oscillator. For customized testing an electrostatic force to the sensor electrodes can be induced and compared with a nominal condition. Thus, a general statement about the functional capability of the sensor module can be made at any time. Rev. 1.3 Page 9 / 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 3.2 Bosch Sensortec Channel multiplexer On the Ax, Ay, and Az output pin there is always the possibility to grip the continuous analog output signals of the corresponding axis. Additional to these continuously available signals, there is the possibility to multiplex any of the 3 axis fully customized to one separate AMUX output pin via an internal channel multiplexer. This e.g. enables the option to read out all three axes at only one output pin. Which of the acceleration signal of the 3 axis is actually multiplexed to the AMUX output pin – or in which sequence – can be selected through the corresponding SEL.0 and SEL.1 pins of the sensor module (see chapter 4.3). Do not connect any external capacitor on the AMUX output pin. Rev. 1.3 Page 10 / 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 4 Bosch Sensortec Operation 4.1 Power-on-reset and power-up sequence An internal power-on reset (POR) is implemented to ensure proper reset during power-up. The POR is active during 100μs (typical value). For this application the power on sequence only occurs when a battery or an external supply is connected to VDD. Normally GND is connected first. There should be a coupling capacitor connected between VDD and GND as shown in chapter 4.8. Low resistance connections are required between decoupling capacitor and sensor pads (< 100Ohms). 4.2 Operation mode selection Two operation modes can be selected: NORMAL and STAND-BY mode. The operation modes are selected by setting SEL1 and SEL0 according to the table given below. SEL.1 SEL.0 Operation Mode Operation feature Current Consumption 0 0 1 0 1 0 NORMAL full performance 200 μA (typical) 1 1 STANDBY current saving 0,7 μA (typical) Description Acceleration measurements of all axes (Ax, Ax, Az plus AMUX) are performed. All sensor features are enabled. Acceleration measurements are stopped, Ax, Ay, Az and AMUX signals are driven to GND through 110kΩ resistors. When stand-by mode is activated, all sensor electrodes are connected to Vss. No electrostatic forces are generated to the electrodes. Power consumption is drastically reduced in this mode. All blocks are disabled except some bias generation and power-on reset generation. This feature enables ultra low power mode operation if the sensor module is turned into Standby mode e.g. between each acceleration measurement. 4.3 Channel multiplexer output selection Using the Channel Multiplexer, it is possible to choose specific axis output signals on the AMUX pin. This allows the user to connect the triaxial BMA145 to an economical single channel AD converter without loss of axis information. The channel selection on AMUX is performed by setting SEL.0 and SEL.1 according to the following table. By setting both, SEL.0 and SEL.1 to 1, the sensor module is set to stand-by Mode. SEL.1 SEL.0 0 0 1 1 0 1 0 1 Rev. 1.3 Operation Mode NORMAL NORMAL NORMAL STAND-BY Output Signal on Channel Multiplexer Serial Output Pin (AMUX) Ax, Ay, Az plus AMUX = Ax Ax, Ay, Az plus AMUX = Ay Ax, Ay, Az plus AMUX = Az Sensor module set to Standby Mode, no Signal on X, Y, Z and AMUX Page 11 / 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 IMPORTANT NOTE: If the features described in 4.2 and 4.3 will not be used, SEL.0 and SEL.1 must be tied to GND. In all other cases, SEL.0 and SEL.1 transitions must be synchronous within a 20ns tolerance to avoid the ASIC to switch to an unwanted state at transitions (valid for the four possible transitions where the two signals SEL.0 and SEL.1 have to change simultaneously). See also the figure given below. 4.4 Analog output on Ax, Ay and Az By selecting the operation mode to “Normal” all 3 axis provide acceleration measurement signals simultaneously on the Ax, Ay and Az pins according to the following equation. V  AX   DD  S  a X   2  V  AY   DD  S  aY   2  V  AZ   DD  S  a Z   2  Ax, Ay and Az are the vector components of the acting acceleration. According to chapter 1 the sensitivity in the ±4g range corresponds to VDD/10 given in V/g. This means, the maximal default acceleration range is ±4g. 4.5 Self test The sensor features an on-chip self-test which can be activated by using the corresponding self test input pin. The self test is realized by a physical deflection of the seismic mass due to an electrostatic force. Thus, it provides contact and functional testing of the complete signal evaluation path including the MEMS acceleration-sensing element and the evaluation ASIC. The self test is activated by setting the self test activation input pin to logic 1. The test acts on all three channels simultaneously. The typical change in output will be a static offset of Rev. 1.3 Page 12 / 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 approximately +0.25g for X and Y and +0.5g for Z axis (nominal value). For the ±4g acceleration range this corresponds to a typical output signal delta of ∆Uoutnom [v] = (VDD [v] / 10) x 0.25 for X and Y and ∆Uoutnom [v] = (VDD [v] / 10) x 0.5 for Z, to be added as a static voltage offset to the current output signal Xout, Yout and Zout. The self test response remains as a static offset on the X, Y, Z and AMUX output as long as the self test activation input pin is not set back to logic 0. Simplified, while the self test is activated, any acceleration or gravitational force applied to the sensor will be observed in the output signal as a superposition of both acceleration and self test signal. OutputOutput SignalSignal [V] [LSB] Self Test Response Self Test Activation PinBit Self Test Activation 1 0 Rev. 1.3 Page 13 / 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 4.6 Bosch Sensortec Polarity of the acceleration output If the sensor is accelerated into the indicated directions, the corresponding channels will deliver a positive acceleration signal (dynamic acceleration). Example: If the sensor is at rest or at uniform motion in a gravity field according to the figure given below, the output signals are:    ± 0g for the X channel ± 0g for the Y channel + 1g for the Z channel +z gravity vector +x top side +y -1g / 1.2V Output signal Ay +1g / 1.8V 0g / 1.5V Output signal Az 0g / 1.5V 0g / 1.5V Rev. 1.3  027 AYWW CCC 0g / 1.5V Output signal Ax upright upright  027 AYWW CCC Sensor orientation (gravity vector )  027 AYWW CCC  027 AYWW CCC The following table lists all corresponding output signals on Ax, Ay, and Az while the sensor is at rest or at uniform motion in a gravity field under assumption of a top down gravity vector as shown above. 0g / 1.5V +1g / 1.8V 0g / 1.5V 0g / 1.5V -1g / 1.2V 0g / 1.5V 0g / 1.5V 0g / 1.5V 0g / 1.5V 0g / 1.5V +1g / 1.8V -1g / 1.2V Page 14 / 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 4.7 Bosch Sensortec Pin configuration (top view, pads not visible) Pin 1 identifier top view Pin 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 1) Name DNC ST GND DNC SEL.0 1) GND SEL.1 1) Z.out AMUX Y.out DNC X.out DNC VDD2 VDD1 DNC Digital - Analog D in/out D in A D in A D in A out A out A out A out A in A in - Description Do not connect! Reserved for factory trimming! Self Test Activation Pin Ground Connection Do not connect! Channel Multiplexer Selection Pin 0 Ground Connection Channel Multiplexer Selection Pin 1 Z Acceleration Parallel Output Channel Multiplexer Serial Output Pin Y Acceleration Parallel Output Do not connect! X Acceleration Parallel Output Do not connect! Supply Voltage Connection Supply Voltage Connection Do not connect! Connect to GND if stand-by mode and multiplexed outputs will not be used. Rev. 1.3 Page 15 / 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 4.8 4.8.1 Bosch Sensortec Connecting diagram Full feature operation The following connection diagram describes the recommended decoupling of the power source (c1=100nF and c2=10nF) as well as the connection to enable full feature operation of the BMA145 including Stand-By, AMUX and Self Test capability. The DNC pins (marked with “X”) must not be connected (floating). For dimensioning of Cx, Cy and Cz refer to chapter 4.8.3. 4.8.2 Simple 3-channel operation The below connection diagram describes the recommended decoupling of the power source (c1=100nF and c2=10nF) as well as the connection to enable a simple 3 channel operation of the BMA145. Stand-By, AMUX and Self Test capability will be disabled. The DNC pins (marked with “X”) must not be connected (floating). For dimensioning of Cx, Cy and Cz refer to chapter 4.8.3. Rev. 1.3 Page 16 / 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 4.8.3 Bosch Sensortec Customizing bandwidth and noise According to the following equation a customized cut-off frequency can be realized by a simple dimension of Cx (Cy , Cz) to create a RC low pass filter. The below given equation corresponds to the x-axis but it is also representative for the y- and z-axis. The AMUX cut-off frequency output behavior is directly linked up to Cx , Cy & Cz . Do not connect an additional external capacitor on the multiplexer output pin. fc _ x  1 2  33k  c x In order to achieve a good compromise between bandwidth and signal conditioning, we recommend to set up the bandwidth between ~300 . . . ~150Hz. To operate the BMA145 with the maximum bandwidth, which internally is limited to 1.5kHz, we recommend to use min. 1nF for Cx , Cy & Cz . 4.9 Handling instruction Micromechanical sensors are designed to sense acceleration with high accuracy even at low amplitudes and contain highly sensitive structures inside the sensor element. The MEMS sensor can tolerate mechanical shocks up to several thousand g's. However, these limits might be exceeded in conditions with extreme shock loads such as e.g. hammer blow on or next to the sensor, dropping of the sensor onto hard surfaces etc. We strongly recommend to avoid g-forces beyond the specified limits (see section 2) during transport, handling and mounting of the sensors in a defined and qualified installation process. This device has built-in protections against high electrostatic discharges or electric fields (e.g. 2kV HBM); however, anti-static precautions should be taken as for any other CMOS component. Unless otherwise specified, proper operation can only occur when all terminal voltages are kept within the supply voltage range. Unused inputs must always be tied to a defined logic voltage level. Please refer to the separately available document “Handling, soldering & mounting instructions” for the BMA145. Rev. 1.3 Page 17 / 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 5 5.1 Bosch Sensortec Package Outline dimensions The sensor housing is a standard LGA package. It is compliant with JEDEC Standard MO-229 Type VGGD-3. Its dimensions are the following: Rev. 1.3 Page 18 / 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 5.2 Bosch Sensortec Printed circuit board (PCB) design The following PCB design is recommended in order to minimize solder voids and stress acting on the sensing element. All dimensions are given in mm. Rev. 1.3 Page 19 / 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 5.3 5.3.1 Bosch Sensortec Marking Mass production samples Labeling Name Symbol Remark Product number 027 AYWW CCC 5.3.2 Sub-con ID A Date code 1 Y Date code 2 WW Lot counter CCC Pin 1 identifier • Coded alphanumerical Y: year, numerically coded 9 = 2009, 0 = 2010, 1 = 2011, ... WW: working week, numerical Engineering samples Labeling 145e AYWW 0Cn CCC Rev. 1.3 Name Symbol Remark Product name 145 BMA145 Eng. Sample ID e Sub-con ID A Date code YWW Y: year, numerically coded 9 = 2009, 0 = 2010, 1 = 2011, ... WW: Working week, numerical Version counter CCC e.g. 0C1 = C1-Sample Pin 1 identifier • Engineering samples are marked with an “e” Coded alphanumerically Page 20 / 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 5.4 Bosch Sensortec Moisture sensitivity level and soldering The moisture sensitivity level of the BMA145 sensors corresponds to JEDEC Level 1, see also - IPC/JEDEC J-STD-020C "Joint Industry Standard: Moisture/Reflow Classification for non-hermetic Solid State Surface Mount Devices" Sensitivity - IPC/JEDEC J-STD-033A "Joint Industry Standard: Handling, Packing, Shipping and Use of Moisture/Reflow Sensitive Surface Mount Devices". The sensor fulfils the lead-free soldering requirements of the above-mentioned IPC/JEDEC standard, i.e. reflow soldering with a peak temperature up to 260°C. 260 °C Rev. 1.3 Page 21 / 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 5.5 Bosch Sensortec Tape and reel specification The BMA145 is shipped in a standard cardboard box. The box dimension for 1 reel is: L x W x H 35cm x 35cm x 6cm BMA145 quantity: 5,000pcs per reel; please handle with care. Rev. 1.3 Page 22 / 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 5.5.1 Bosch Sensortec Orientation The next figure shows the orientation of the BMA145 devices relative to the tape: Page 23 / proprietary information  027 AYWW CCC  027 AYWW CCC  027 AYWW CCC  027 AYWW CCC Rev. 1.3 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 5.6 Bosch Sensortec RoHS compliancy The BMA145 sensor meets the requirements of the EC restriction of hazardous substances (RoHS) directive, see also: Directive 2002/95/EC of the European Parliament and of the Council of 27 January 2003 on the restriction of the use of certain hazardous substances in electrical and electronic equipment. 5.7 Halogen content Results of chemical analysis show that the BMA145 contains less than 900ppm (by weight) of Fluorine, Chlorine, Iodine and Bromine (i.e.