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| Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec Triaxial 2g/10g Accelerometer SMB365 KEY FEATURES Three-axis accelerometer Switchable g-range (2g/10g) Standard SMD package: QFN 4.0x4.0 mm2 footprint, 1.2mm height 4mg resolution at 50Hz bandwidth Ultra-low power ASIC: 600A at VDD 2.5V SPI interface Interrupt feature for mobile wake-up or zero-g detection (free fall) Full self-test capability RoHS lead-free compliant Based on automotive-proven Bosch Silicon Surface Micromachining Process TYPICAL APPLICATIONS Tilt, motion and vibration sensing in - Cell phones - Handhelds - Computer peripherals - Man-machine interfaces - Virtual reality - Games GENERAL DESCRIPTION The SMB365 is a triaxial low-g acceleration sensor for consumer market applications. 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. As all other Bosch inertial sensors, it is a twochip arrangement. An application-specific IC evaluates the output of a three-channel micromechanical acceleration-sensing element that works according to the differential capacitance principle. The underlying micromachining process has proven its capability in more than 100 million Bosch accelerometers and gyroscopes so far. The SMB365 provides a digital 10bit output signal via an SPI interface. With an appropriate SPI command the full measurement range can be chosen to 2g or 10g. A first-order filter with a pole-frequency of 50Hz is included to provide preconditioning of the measured acceleration signal. Typical noise level and quantization lead to a sensitivity resolution of 4mg or an accuracy of 0.3 in an inclination sensing application, respectively. The current consumption is typically 600A at a supply voltage of 2.5V. Furthermore, the sensor can be switched into a low-power mode where it informs the host system about an acceleration change via an interrupt pin. This feature can be used to wake-up the host system from a sleep mode. The sensor also features full self-test capability. It is activated via SPI command which results in a physical deflection of the seismic mass in the sensing element due to an electrostatic force. Thus, it provides full testing of the complete signal evaluation path including the micromachined sensor structure and the evaluation ASIC. The sensor is available in a standard SMD QFN package with a footprint of 4x4mm2 and a height of 1.2mm. Rev. 1.2 Page 1 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec TABLE OF CONTENTS 1 2 3 SPECIFICATION................................................................................................................................... 3 ABSOLUTE MAXIMUM RATINGS....................................................................................................... 4 SPI INTERFACE ................................................................................................................................... 5 3.1 3.2 3.3 SPI SPECIFICATION .......................................................................................................................... 5 SPI PROTOCOL ................................................................................................................................ 6 SPI TIMING ...................................................................................................................................... 7 4 MEMORY .............................................................................................................................................. 8 4.1 EEPROM........................................................................................................................................ 8 4.1.1 Register Arithmetic ................................................................................................................. 8 4.2 GLOBAL MEMORY MAPPING .............................................................................................................. 9 5 OPERATION ....................................................................................................................................... 10 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 GENERAL DESCRIPTION.................................................................................................................. 10 OPERATION MODES AND SENSITIVITY RESOLUTION.......................................................................... 10 INTERRUPT FEATURE (LOW POWER MODE) ..................................................................................... 11 ACCELERATION DATA FORMAT........................................................................................................ 13 SELF TEST ..................................................................................................................................... 13 POLARITY OF THE ACCELERATION OUTPUT ...................................................................................... 14 PIN CONFIGURATION ...................................................................................................................... 15 CONNECTING DIAGRAM................................................................................................................... 16 HANDLING INSTRUCTION ................................................................................................................ 17 6 PACKAGE .......................................................................................................................................... 17 6.1 6.2 6.3 6.4 OUTLINE DIMENSIONS..................................................................................................................... 17 MARKING ....................................................................................................................................... 19 MOISTURE SENSITIVITY LEVEL AND SOLDERING ............................................................................... 19 ROHS COMPLIANCY ....................................................................................................................... 19 ENGINEERING SAMPLES.................................................................................................................. 20 LIMITING VALUES ............................................................................................................................ 20 LIFE SUPPORT- AND AUTOMOTIVE APPLICATIONS .............................................................................. 20 7 DISCLAIMER ...................................................................................................................................... 20 7.1 7.2 7.3 Rev. 1.2 Page 2 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec 1 Specification Symbol gFS2g gFS10g VDDA VDDD IDD IDDlpm IDDsbm TA only for SPI I/O; VDDD VDDA digital and analog digital and analog digital and analog -40 Condition switchable via SPI command 2.3 1.6 Min Typ 2 10 2.5 1.8 600 500 5 +85 3.6 3.6 Max Units g g V V A A A C Parameter OPERATING RANGE Acceleration Range Supply Voltage Analog Supply Voltage Digital Supply Current in Normal Mode Supply Current in Low-Power Mode Supply Current in Standby Mode Operating Temperature OUTPUT SIGNAL Sensitivity Zero-g Offset 2 S2g S10g Off TCO rat_off f-3dB NL g-range 2g g-range 10g TA=25C, VDDD=2.5V -15C TA +55C Offset drift vs. VDDA 1 order filter best fit straight line 2g xy 2g z 10g xy 10g z st 240 47 256 51 10 0.5 30 272 55 LSB/g LSB/g LSB LSB/K LSB/V Zero-g Offset Temperature Drift Ratiometricity Error3 Bandwidth Nonlinearity 25 50 0.5 300 150 60 30 1 75 Hz %FS Self Test Response TST activated via SPI LSB Output Noise nrms rms LSB Rev. 1.2 Page 3 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec MECHANICAL CHARACTERISTICS Cross Axis Sensitivity Alignment Error S relative contribution between 3 axes relative to package outline 0.2 0.5 % a 2 Absolute Maximum Ratings Parameter Supply Voltage Storage Temperature range duration 50s Mechanical Shock duration 1.0ms free fall onto hard surfaces ESD HBM, at any pin CDM Condition VDDD and VDDA Min -0.3 -50 Max 3.6 +150 10,000 2,000 1.5 2 500 Units V C g g m kV V Rev. 1.2 Page 4 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec 3 - SPI Interface 16-bit SPI protocol (mode 3) Clock frequency up to 8MHz 1 read/write bit (R/W=0 for writing, R/W=1 for reading) 7 address bits 8 data bits The most significant bit (MSB) is transferred first during address and data phases. The data acquisition by the sensor occurs at the rising edge of SCK. The output data provided by the sensor is synchronized with the falling edges of SCK. The CSB input has a 120k pull-up resistor to VDDD. The SPI is used for regular reading of the acceleration signal coded on 10 bits. Periodically, an update of the digitalized temperature is also available (see the timing diagrams for a detailed description). For a complete readout of the acceleration, two successive read cycles are required because a maximum of 8 bits is readable within a cycle. A 10-bit coded signal is split into 7 MSB and 3 LSB. The SPI interface is also used for the EEPROM programming/reading. Due to finite access time, the read cycle of an EEPROM byte needs two SPI cycles, in order to keep the standard protocol. 3.1 SPI Specification Symbol fSPI CSPI VIL_SPI VIH_SPI VHYST_SPI RCSB 0.7*VDDD 0.1* VDDD 70 120 190 Condition VDDD minimum Min 0.5 Typ Max 8 25 0.3* VDDD Units MHz pF V V V k Parameter Clock input frequency Capacitive load (MISO) Input-low level Input-high level Hysteresis of the inputs CSB pull-up resistor Rev. 1.2 Page 5 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec 3.2 SPI Protocol The used protocol corresponds to the standard SPI mode 3. SPI Memory Write cycle description CSB SCK MOSI MISO A6 .. A0 : D7 .. D0 : 7 Address bits 8 Data bits R/W A6 A5 A4 A3 A2 A1 A0 D7 HiZ D6 D5 D4 D3 D2 D1 D0 SCK frequency : 8 MHz max. SPI Memory Read cycle description (divided in two SPI cycles due to EEPROM read access time) CSB SCK MOSI MISO A6 .. A0 : D7 .. D0 : R/W A6 A5 A4 HiZ A3 A2 A1 A0 X X X X X X X X X R/W A6 A5 HiZ A4 A3 A2 A1 A0 D7 D6 D5 D4 X D3 D2 D1 D0 HiZ 7 Address bits 8 Data bits SPI Acceleration/Temperature Read cycle description CSB SCK MOSI MISO A6 .. A0 : D7 .. D0 : R/W A6 A5 A4 HiZ A3 A2 A1 A0 D7 D6 D5 D4 X D3 D2 D1 D0 HiZ 7 Address bits 8 Data bits EM/WIL 08/10/03 Due to the standard 16-bit protocol, the digital codes for the acceleration values must be read by two successive SPI cycles. The user has to read the 7 MSB first and then the 3 LSB. It is also possible to read only the 7 MSB. The 3 LSB are protected in such a way that during the read-out of the 7 MSB the LSB are not changed or updated. The update of the LSB does not take place before the MSB are read again. Therefore it cannot happen that a mixed acceleration value is read. Rev. 1.2 Page 6 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec 3.3 SPI Timing 1 2 CSB 3 4 SCK 7 MISO MOSI 5 6 # 1 2 3 4 5 6 7 Parameter CSB setup time CSB hold time SCK high period SCK low period MOSI setup time MOSI hold time MISO delay time Symbol tsetup_csb thold_csb thigh_sck tlow_sck tsetup_mosi thold_mosi tvalid_miso Min 16 16 25 25 10 10 22 Units ns Rev. 1.2 Page 7 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec 4 Memory 4.1 EEPROM An EEPROM is used to store the non-volatile data, calibration parameters and the current working modes. These are in detail g-range (2g or 10g) operation mode (full performance, low-power, standby) interrupt mode (global or independent) interrupt acceleration threshold and hysteresis level self test. 4.1.1 Register Arithmetic The following arithmetics are used for memory registers. Register AX|Y|Z (acceleration values) THRESHOLD (TH or TH_X|Y|Z) HYSTERESIS (HY or HY_X|Y|Z) Format 2's complement unsigned positive unsigned positive Bit width 10 either 5 or 7 either 3 or 7 Rev. 1.2 Page 8 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec 4.2 Global Memory Mapping The global memory mapping comprises EEPROM and latches. bit7 40h - 7Fh 30h - 3Fh 2Ch - 2Fh 2Bh 2Ah 29h 28h 27h 26h 25h 24h 23h 22h 21h 20h 1Fh 1Eh 1Dh 1Ch 1Bh 1Ah 10h-19h 0FH 0Eh 0Dh 0Ch 0Bh 0Ah 09h 08h 07h 06h 05h 04h 03h 02h 01h 00h reserved adress unused bits A_X (Current value of X axis Acceleration) (MSB) unused addresses unused bits A_Z (Current value of Y axis Acceleration) (MSB) A_X (LSB) unused bits A_Y (Current value of Z axis Acceleration) (MSB) A_Z (LSB) A_Y (LSB) Self Test Int. mode 2g / 10g hy_Y(2) hy_Z(2) hy_X(2) hy_Y(1) hy(6) hy_Z(1) th(6) hy_X(1) Oscillator trimming Sensor ID Operation mode + PROT hy_Y(0) hy(5) hy_Z(0) th(5) hy_X(0) th_Y(4) hy(4) th_Z(4) th(4) th_X(4) th_Y(3) hy(3) th_Z(3) th(3) th_X(3) th_Y(2) hy(2) th_Z(2) th(2) th_X(2) Bandgap trimming th_Y(1) hy(1) th_Z(1) th(1) th_X(1) th_Y(0) hy(0) th_Z(0) th(0) th_X(0) bit6 bit5 bit4 bit3 bit2 bit1 bit0 Reset NA NA 00h 00h NA NA NA NA NA NA NA NA NA NA 00h 00h 00h 00h 00h 00h NA 00h 00h 00h NA 00h 00h NA 00h 00h 00h 00h 00h 00h 00h 00h 00h EEPROM Protected EEPROM Read-only Image The image registers are read-only. All EEPROM registers are duplicated into the corresponding image registers. Rev. 1.2 Page 9 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec 5 Operation 5.1 General Description The SMB365 is a triaxial low-g 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. The sensor is set up as a two-chip arrangement in a standard mold package. An application-specific IC evaluates the output of a three-channel micromechanical acceleration-sensing element that works according to the differential capacitance principle. The ASIC is produced in a standard CMOS process. The production of the sensing element is based on standard semiconductor process steps followed by special steps providing the functional structure. These steps start 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. This in turn enables the hybrid two-chip assembly. The poly layer is patterned by deep reactive ion etching in an inductive coupled plasma (DRIE-ICP, the socalled 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. Eventually the sensing element is hermetically sealed by a bulk mircromachined cap to prevent damages of the structure by dicing, packaging and operation of the device. The encapsulation is performed in a cleanroom environment to reduce the risk of particle contamination to a minimum. Finally, the sensor is packaged in a standard surface mountable micro leadframe QFN housing. Here the ASIC is stacked onto the sensing element. In the ASIC, three different so called self-balancing bridges convert the change of capacitances into voltages. These signals are preconditioned by first order 50Hz filters and then multiplexed, amplified and ASIC Sensing Element C1x C2x C1y C2y C1z C2z Self-Balancing Bridge X-axis Low-Pass Filter (30Hz) (50Hz) Amplifier MUX ADC SPI SCK CSB MISO MOSI INT Self-Balancing Bridge Y-Axis Low-Pass Filter (30Hz) (50Hz) Self-Balancing Bridge Z-Axis Low-Pass Filter (30Hz) (50Hz) EEPROM PTAT VDDD VDDA VSS converted into a digital output signal. 5.2 Operation Modes and Sensitivity Resolution The sensor can be operated in three different modes: * normal mode * low-power mode * standby mode. The different modes are chosen via the SPI interface (see EEPROM mapping). In normal mode the sensor reaches its full performance. In the low-power (interrupt) mode the sensor is fully functional but Rev. 1.2 Page 10 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec the performance is reduced. If the sensor is switched to standby, the ASIC enters a sleep mode. Only a part of the logic and the SPI block are active. All analog blocks including EEPROM are deactivated. The sensitivity resolution varies as follows: Operation Mode Normal Low-power (Interrupt) Standby 10bit roughly corresponds to 4mg, 7bit to 30mg resolution. Due to non-perfect decoupling, any SPI activity will perturb the A/D conversions. The best case is the absence of SPI activity during A/D conversion which is not possible all the time because of synchronization issues. The A/D conversion for the acceleration signals about X-, Y-, Z-axis are performed sequentially. Therefore it is very unlikely that the A/D conversion of a given axis will be systematically perturbed by SPI activity because the duration of a SPI cycle is very short compared to an A/D conversion. Of course, this is only valid if there are not to many other peripherals on this SPI bus. Sensitivity Resolution 10 7 Units bit 5.3 Interrupt Feature (Low Power Mode) The sensor (slave) can inform the host system (master) about an acceleration change even if SPI communication is not taking place. This feature can be used as a "wake-up" for instance. It is working in both g-range modes (2g and 10g), but only in low-power mode. No interrupt is generated in normal mode and/or during SPI traffic. In case of a certain acceleration change the sensor will send an interrupt signal (INT, active high) via the interrupt pin and will keep it up as long as the acceleration is larger then a certain hysteresis level. Via SPI command it can be chosen between a global and a channel independent interrupt mode. In the global mode the same values for interrupt threshold and hysteresis level are valid for all three channels (both with 7 bit resolution, i.e. 16mg resolution in 2g-mode). In the independent mode theses values can be chosen individually for each channel (interrupt 5 bit, hysteresis 3 bit resolution, i.e. 63mg/250mg resolution in 2g-mode). The interrupt is activated when the acceleration signal (absolute value) in at least one of the channels exceeds its individual interrupt threshold (TH_X, TH_Y and TH_Z respectively) or the global interrupt threshold (TH) depending on the chosen interrupt mode. It is deactivated as soon as all channels fall (or still are) below their respective levels threshold levels minus their respective hysteresis values (individual: HY_X, HY_Y. HY_Z; global: HY). As mentioned in the register arithmetic, all threshold and hysteresis values (TH_X, TH_Y, TH_Z, TH, HY_X, HY_Y. HY_Z and HY) are unsigned. The acceleration codes for the 3 channels A_X, A_Y and A_Z have a 2's complement format and a coding on 10 bits. The MSB of the acceleration code gives the sign of the acceleration and the 9 LSB contain the information of the absolute acceleration value. Example of an interrupt generated by the X channel for the interrupt mode 1 (individual): INT is activated when ABS(A_X) 16*TH_X Rev. 1.2 Page 11 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec INT is deactivated when ABS(A_X) < 16*TH_X - 64*HY_X and no interrupt activation by the other channels Example of an interrupt generated by the X channel for the interrupt mode 0 (global): INT is activated when ABS(A_X) 4*TH INT is deactivated when ABS(A_X) < 4*TH - 4*HY and no interrupt activation by the other channels Notice that TH_X(4..2) is always larger than HY_X, i.e. TH_X>4*HY_X. This is also valid for all other channels and the global values, where we have TH>HY (both are coded on 7 bits). If the user does not respect this rule (for all channels) or as soon as one of the interrupt thresholds is set to 0, the interrupt is deactivated. The EEPROM registers dedicated to interrupt thresholds and hysteresis levels accept all code combinations which is required for storing the chip alignment error/cross axis sensitivity data. If the user modifies any threshold and/or hysteresis value, the interrupt output is not updated immediately but only after a refresh of the acceleration codes. Application Hints Wake-Up: A normal lifting of the sensor (like taking an object from a table) easily leads to acceleration gradients of 25g/s=100mg/4ms and to an amplitude of 500mg. Zero-g/Free Fall Detection: The interrupt can also be used for zero-g or free-fall detection. To this end 2g- and global interrupt mode have to be chosen and the output signal has to be interpreted as active low. In case of a free fall all axes will experience zero-g. Therefore the interrupt threshold should be chosen close to 0 with the minimum hysteresis. The exact values depend on the application but a minimum value of ~100mg is required taking into account the 0g-offset tolerance and temperature drift: In this case the interrupt will be at high level if the sensor is in normal use. Only in case of a free fall all 3 axes will experience accelerations smaller than 100mg and the output will switch to low level. Rev. 1.2 Page 12 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec 5.4 Acceleration Data Format The description of the digital signal is "2's complement". From negative to positive accelerations, the following sequence for the 2g measurement range can be observed (10g correspondingly): -2.000g : -1.996g : ... -0.004g : 0.000g : +0.004g : ... +1.992g : +1.996g : 10 0000 0000 10 0000 0001 11 1111 1111 00 0000 0000 00 0000 0001 01 1111 1110 01 1111 1111 5.5 Self Test The sensor features an on-chip self-test which can be activated by changing the corresponding self test bit in the corresponding via SPI. The self test is realized by a physical deflection of the seismic mass due to an electrostatic force. Thus, it provides full testing of the complete signal evaluation path including the micromachined sensor structure and the evaluation ASIC. The self test is activated by setting the self test activation bit to 1. The test works in all measurement modes (2g, 10g, normal, low-power) and acts on all three channels simultaneously. The typical change in output will be 300LSB in the 2g-mode and 60LSB in the 10g-mode. The self test response remains as a static offset on the output as long as the self test register is not set back to 0. 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. Output Signal [LSB] Self Test Response Self Test Activation Bit 1 0 Rev. 1.2 Page 13 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec 5.6 Polarity of the Acceleration Output If the sensor is accelerated in the indicated directions, the corresponding channel will deliver a positive acceleration signal (dynamic acceleration). If the sensor is at rest and the force of gravity is working along the indicated directions, the output of the corresponding channel will be negative. z x top side y 1 Rev. 1.2 Page 14 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec 5.7 Pin Configuration Pin 1 identifier Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Name NC VDDA VSS DNC CSB DNC INT SCK DNC MOSI MISO VDDD NC NC Function not connected ASIC analog core supply ASIC ground do not connect SPI select (chip select bar) do not connect Interrupt output signal SPI clock do not connect SPI output (master out slave in) SPI input (master in slave out) ASIC digital core supply not connected not connected Rev. 1.2 Page 15 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec 5.8 Connecting Diagram The following external components are recommended to decouple the power source. 1.8V 2.5V INT CSB SCK MISO MOSI VDDD VDDA VSS C1 100nF C2 100nF C3 10nF 5.9 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 micromachined sensors 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 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. Rev. 1.2 Page 16 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec 6 Package 6.1 Outline Dimensions The sensor housing is a standard QFN package. It is compliant with JEDEC Standard MO-220. Its dimensions are the following: Rev. 1.2 Page 17 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec Rev. 1.2 Page 18 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec 6.2 Marking product part number date code sensor lot number ASIC lot number 41003 YYWW XXXXX ZZZZZZ pin 1 identifier Engineering Samples are marked with the following symbol: * 6.3 - Moisture Sensitivity Level and Soldering The moisture sensitivity level of the SMB365 sensors corresponds to JEDEC Level 3, see also IPC/JEDEC J-STD-020C "Joint Industry Standard: Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices" 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 260C. 6.4 RoHS Compliancy The SMB365 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". Rev. 1.2 Page 19 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec 7 Disclaimer 7.1 Engineering Samples Engineering samples (marked with *) may not fulfill the complete technical data within this specification. As well, Engineering samples (marked with *) are not determined for use in safety relevant automotive applications, life support appliances reselling or passing to final consumers. The customer indemnifies Bosch Sensortec for product liability claims or waives of recourse to Bosch Sensortec, if third parties advance due to or in connection with a failure, a defect in function or misuse of the customer samples supplied by Bosch Sensortec. 7.2 Limiting values Limiting values given are in accordance with the Absolute Maximum Ratings (Chapter 2). Stress above one or more of the limiting values may cause permanent damage to the device. Operation of the device at these or at any other conditions above is not implied. Exposure to limiting values for extended periods may also affect device reliability. 7.3 Life support- and automotive applications The SMB365 is not designed for use in life support- or safety relevant automotive appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Again, the customer of Bosch Sensortec using or selling the SMB365 for use in such applications do so at one's own risk and agree again to fully indemnify Bosch Sensortec for any damages resulting from such improper use or sale. Rev. 1.2 Page 20 (c) 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. 7211RB11. Preliminary Datasheet SMB365 Three-axis accelerometer Bosch Sensortec Document History and Modification Rev. No Chapter 0.0 6.1 1.1 5.7 1.11 1.2 7 5.7 1 4.2 5.7 Description of Modification/Changes - New outline dimensions - New pin configuration Review - Disclaimer - Pin1 identifier Test signal z Memory Mapping Pin allocation Name Date 02-Feb-06 27-Apr-06 27-May-06 30-May-06 Bosch Sensortec GmbH Gerhard-Kindler-Strasse 8 72770 Reutlingen Leopold.Beer@bosch-sensortec.com www.bosch-sensortec.com Modifications reserved | Printed in Germany Version_1.2_062006 Rev. 1.2 Page 21 (c) 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. 7211RB11. |
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