PART NUMBER: KX122-1037 2g / 4g / 8g Tri-axis Digital Rev. 4.0 Accelerometer Specifications July 16, 2015 Product Description The KX122-1037 is a tri-axis +/-2g, +/-4g or +/-8g silicon micromachined accelerometer with integrated 2048 byte buffer, orientation, tap/double tap, activity detecting, and Free fall algorithms. The sense element is fabricated using Kionixs proprietary plasma micromachining process technology. Acceleration sensing is based on the principle of a differential capacitance arising from acceleration- induced motion of the sense element, which further utilizes common mode cancellation to decrease errors from process variation, temperature, and environmental stress. The sense element is hermetically sealed at the wafer level by bonding a second silicon lid wafer to the device using a glass frit. A separate ASIC device packaged with the sense element provides signal conditioning, and intelligent user-programmable application algorithms. The accelerometer is delivered in a 2 x 2 x 0.9 mm LGA plastic package operating from a 1.8 3.6V DC supply. Voltage regulators are used to maintain constant internal operating voltages over the range of input supply voltages. This results in 2 stable operating characteristics over the range of input supply voltages. I C or SPI digital protocol is used to communicate with the chip to configure and check for updates to the orientation, Directional TM Tap detection, Free fall detection and activity monitoring algorithms. Features 2 x 2 x 0.9 mm LGA User-selectable g Range up to +/- 8g User-selectable Output Data Rate up to 25600Hz User-selectable low power or high resolution mode Digital High-Pass Filter Outputs Extra large embedded 2048 byte FIFO/FILO buffer Low Power Consumption with FlexSet Performance Optimization Internal voltage regulator TM Enhanced integrated Free fall, Directional Tap/Double-Tap , and Device-orientation Algorithms User-configurable wake-up function 2 Digital I C up to 3.4MHz Digital SPI up to 10MHz Lead-free Solderability Excellent Temperature Performance High Shock Survivability Factory Programmed Offset and Sensitivity Self-test Function 36 Thornwood Dr. Ithaca, NY 14850 2015 Kionix All Rights Reserved tel: 607-257-1080 fax:607-257-1146 www.kionix.com - info kionix.com Page 1 of 76 PART NUMBER: KX122-1037 2g / 4g / 8g Tri-axis Digital Rev. 4.0 Accelerometer Specifications July 16, 2015 Table of Contents PRODUCT DESCRIPTION .................................................................................................................................................................... 1 FEATURES ......................................................................................................................................................................................... 1 TABLE OF CONTENTS ......................................................................................................................................................................... 2 FUNCTIONAL DIAGRAM .................................................................................................................................................................... 5 PRODUCT SPECIFICATIONS ................................................................................................................................................................ 6 MECHANICAL ............................................................................................................................................................................................ 6 ELECTRICAL ............................................................................................................................................................................................... 7 Start Up Time Profile ........................................................................................................................................................................ 8 Current Profile .................................................................................................................................................................................. 8 Power-On Procedure ......................................................................................................................................................................... 9 ENVIRONMENTAL ..................................................................................................................................................................................... 10 TERMINOLOGY ........................................................................................................................................................................................ 11 g ...................................................................................................................................................................................................... 11 Sensitivity ........................................................................................................................................................................................ 11 Zero-g offset ................................................................................................................................................................................... 11 Self-test ........................................................................................................................................................................................... 11 FUNCTIONALITY ....................................................................................................................................................................................... 12 Sense element ................................................................................................................................................................................. 12 ASIC interface ................................................................................................................................................................................. 12 Factory calibration .......................................................................................................................................................................... 12 APPLICATION SCHEMATIC .......................................................................................................................................................................... 13 PIN DESCRIPTIONS ................................................................................................................................................................................... 13 TEST SPECIFICATIONS ................................................................................................................................................................................ 14 PACKAGE DIMENSIONS AND ORIENTATION ................................................................................................................................................... 15 Dimensions ..................................................................................................................................................................................... 15 Orientation ..................................................................................................................................................................................... 16 DIGITAL INTERFACE ......................................................................................................................................................................... 18 2 I C SERIAL INTERFACE ............................................................................................................................................................................... 18 2 I C OPERATION ....................................................................................................................................................................................... 19 WRITING TO A KX122 8-BIT REGISTER ........................................................................................................................................................ 20 READING FROM A KX122 8-BIT REGISTER .................................................................................................................................................... 20 DATA TRANSFER SEQUENCES ..................................................................................................................................................................... 21 HS-MODE .............................................................................................................................................................................................. 22 2 I C TIMING DIAGRAM ............................................................................................................................................................................... 23 SPI COMMUNICATIONS............................................................................................................................................................................. 24 4-WIRE SPI INTERFACE ............................................................................................................................................................................. 24 4-WIRE SPI TIMING DIAGRAM ................................................................................................................................................................... 25 READ AND WRITE REGISTERS ..................................................................................................................................................................... 26 36 Thornwood Dr. Ithaca, NY 14850 2015 Kionix All Rights Reserved tel: 607-257-1080 fax:607-257-1146 www.kionix.com - info kionix.com Page 2 of 76