EVAL-KXSS5-4457

PART NUMBER: ± 3g Tri-axis Accelerometer Specifications KXSS5-4457 Rev. 3 Feb-2013 Product Description The KXSS5-4457 is a Tri-axis, silicon micromachined accelerometer with a full-scale output range of +/-3g (29.4 m/s/s). The sense element is fabricated using Kionix’s 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, selftest, and temperature compensation. The accelerometer is delivered in a 5 x 3 x 0.9 mm LGA plastic package operating from a 1.8 – 3.6V DC supply. The ASIC will trigger interrupt signals if an acceleration threshold is exceeded in any axis (motion interrupt), or if the total acceleration falls below a threshold (freefall interrupt). The thresholds can be set by the customer or default to factory calibrated values. Either I2C or SPI interfaces can be used to communicate to the chip to trigger A/D conversions, set thresholds or threshold delays, or manage power consumption. Functional Diagram X Sensor Y Sensor Charge Amp Z Sensor 7 8 9 Temp Sensor Vdd 14 A/D SPI/I2C/Logic Enable6 Interrupt Logic GND 10 2 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com 32K 32K 32K 1kHz LPF 3 4 11 12 5 © 2013 Kionix – All Rights Reserved 584-4259-1302251530 Page 1 of 31 PART NUMBER: ± 3g Tri-axis Accelerometer Specifications KXSS5-4457 Rev. 3 Feb-2013 Product Specifications Table 1. Mechanical (specifications are for operation at 1.8V and T = 25C unless stated otherwise) Parameters Units Min Operating Temperature Range Zero-g Offset (analog) Zero-g Offset (digital) Zero-g Offset Variation from RT over Temp. Sensitivity (analog) Sensitivity (digital) Sensitivity Variation from RT over Temp. ºC V counts mg/ ºC mV/g counts/g %/ ºC Offset Ratiometric Error (Vdd = 1.8V ± 5%) % Sensitivity Ratiometric Error (Vdd = 1.8V ± 5%) % Self Test Output change on Activation g Non-Linearity Cross Axis Sensitivity Noise Density (on filter pins) Freefall threshold 1 Freefall delay Motion threshold 1 Motion delay Notes: 1 1 % of FS % g / √Hz g ms g ms -25 0.852 1939 233 530 Typical Max 0.9 2048 0.6 240 546 0.01 (xy) 0.03 (z) 0.3 0.6 (xy) 0.3 (z) 0.8 (xy) 0.6 (z) 0.1 2 175 70 0.948 2157 247 562 0.4 4 2.5 4 2 1. Factory default settings. User can adjust thresholds and delays using I C or SPI interface. 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2013 Kionix – All Rights Reserved 584-4259-1302251530 Page 2 of 31 PART NUMBER: ± 3g Tri-axis Accelerometer Specifications KXSS5-4457 Rev. 3 Feb-2013 Table 2. Electrical (specifications are for operation at 1.8V and T = 25C unless stated otherwise) Parameters Units Min Typical Max Supply Voltage (Vdd) Operating V 1.7 1.8 3.6 Current Consumption Operating Standby A A V V A k Hz ms 400 700 0.0012 0 32 1000 0.8 200 1 400 1000 Input Low Voltage Input High Voltage Input Pull-down Current Analog Output Resistance(Rout) 1 Bandwidth (-3dB) 2 Power Up Time A/D Conversion time 3 SPI Communication Rate 2 I C Communication Rate s MHz kHz 0.8 * Vdd 24 800 0.2 * Vdd 40 1200 Notes: 1. Internal 1 kHz low pass filter. Lower frequencies are user definable with external capacitors. 2. Power up time is determined after the enabling of the part. The typical value reported is when using the internal 1kHz low pass filter only. When a user defined low pass filter is used, the power up time is 5 times the RC time constant of the filter. 3. SPI Communication Rate can be optimized for faster communication per the SPI timing diagram below. 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2013 Kionix – All Rights Reserved 584-4259-1302251530 Page 3 of 31 PART NUMBER: ± 3g Tri-axis Accelerometer Specifications KXSS5-4457 Rev. 3 Feb-2013 KXSS5 SPI Timing Diagram t1 t2 t3 t4 t5 t6 t7 nCS CLK SDI bit 7 bit 6 bit 1 5 bit 0 SDO bit 7 5 bit 7 5 t8 t9 bit 6 bit 1 5 bit 0 bit 6 bit 1 5 bit 0 t10 t11 Table 3. SPI Timing Number Description MIN t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 Enable transition from low to high after Vdd above 1.6V nCS low to first CLK setup time CLK pulse width: high (Does not apply to the last bit of a byte.) CLK pulse width: low (Does not apply to the last bit of a byte.) CLK pulse width: high (Only on last bit of a byte.) CLK pulse width: low (Only on last bit of a byte.) nCS low after the final CLK falling edge nCS pulse width: high SDI valid to CLK rising edge CLK rising edge to SDI invalid CLK falling edge to SDO valid CLK falling edge to SDO invalid Recommended SPI CLK A/D conversion CLK hold (t5) 1 130 130 130 200 350 350 130 10 100 0 1 200 Notes 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com MAX Units 130 - ms ns ns ns ns ns ns ns ns ns ns ns us us © 2013 Kionix – All Rights Reserved 584-4259-1302251530 Page 4 of 31 PART NUMBER: ± 3g Tri-axis Accelerometer Specifications KXSS5-4457 Rev. 3 Feb-2013 Table 4. Environmental Parameters Units Min Typical Max V -0.3 - 7.0 ºC ºC -40 -55 - 85 150 Mech. Shock (powered and unpowered) g - - 5000 for 0.5ms ESD V - - 2000 Supply Voltage (Vdd) Absolute Limits Operating Temperature Range Storage Temperature Range HBM Caution: ESD Sensitive and Mechanical Shock Sensitive Component, improper handling can cause permanent damage to the device. This product conforms to Directive 2002/95/EC of the European Parliament and of the Council of the European Union (RoHS). Specifically, this product does not contain lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE) above the maximum concentration values (MCV) by weight in any of its homogenous materials. Homogenous materials are "of uniform composition throughout." HF This product is halogen-free per IEC 61249-2-21. Specifically, the materials used in this product contain a maximum total halogen content of 1500 ppm with less than 900-ppm bromine and less than 900-ppm chlorine. Soldering Soldering recommendations are available upon request or from www.kionix.com. 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2013 Kionix – All Rights Reserved 584-4259-1302251530 Page 5 of 31 PART NUMBER: ± 3g Tri-axis Accelerometer Specifications KXSS5-4457 Rev. 3 Feb-2013 Application Schematic 14 Vdd 1 13 CS 2 12 MOT Enable ADDR/SDI 3 11 FF/MOT SDA/SDO 4 10 SCL/SCLK 5 9 Z Enable 6 8 Y C1 KXSS5 7 X Table 5. KXSS5 Pin Descriptions Pin Name 1 Vdd 2 nCS 3 ADDR/SDI The power supply input. SPI Enable1 I2C/SPI mode selection (1 = I2C mode, 0 = SPI mode) I2C programmable address bit/SPI Serial Data Input1 4 SDA/SD0 I2C Serial Data/SPI Serial Data Output1 5 SCL/SCLK 6 Enable 7 X Output 8 Y Output 9 Z Output 10 GND 11 FF/MOT (output) I2C Serial Clock/SPI Serial Clock1 High - Normal operation Transition from low to high – Default values loaded into registers from eeprom, unlatched operation2 Low - Device is in standby, power down mode, I2C/SPI mode will not function The output of the x-channel. Optionally, a capacitor placed between this pin and ground will form a lowpass filter in addition to the internal 1kHz internal filter. The output of y-channel. Optionally, a capacitor placed between this pin and ground will form a lowpass filter in addition to the internal 1kHz internal filter. The output of z-channel. Optionally, a capacitor placed between this pin and ground will form a lowpass filter in addition to the internal 1kHz internal filter. Ground Low: no interrupts High: (all channels below Freefall threshold) OR (at least one channel above Motion threshold AND (MOT Enable=High)) Low – disable Motion interrupt High – enable Motion interrupt to “OR” with freefall interrupt onto the FF/MOT pin The power supply input. 13 MOT Enable (input) Vdd 14 Vdd 12 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com Description The power supply input. Decouple this pin to ground with a 0.1uF ceramic capacitor. © 2013 Kionix – All Rights Reserved 584-4259-1302251530 Page 6 of 31 PART NUMBER: ± 3g Tri-axis Accelerometer Specifications KXSS5-4457 Rev. 3 Feb-2013 Application Design Notes 1 When used without digital communications, make the following connections: 2 nCS = Vdd (puts the part into I C mode, disables pullups on SDA/SDO pad) SCL/SCLK = GND SDA/SDO = GND ADDR/SDI = GND or Vdd 14 Vdd 1 13 2 12 MOT Enable 3 11 FF/MOT C1 KXSS5 Enable 4 10 5 9 Z 6 8 Y 7 X In this mode, the interrupts operate in unlatched mode with the factory default settings for free-fall and motion thresholds and delays. 2 Enable cannot transition from low to high until a minimum of 1 ms after Vdd reaches 1.6V. Application Design Equations The bandwidth is determined by the filter capacitors connected from pins 7, 8 and 9 to ground. The response is single pole. Given a desired bandwidth, fBW, the filter capacitors are determined by: C2  C3  C4  36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com 4.97 x106 f BW © 2013 Kionix – All Rights Reserved 584-4259-1302251530 Page 7 of 31 PART NUMBER: ± 3g Tri-axis Accelerometer Specifications KXSS5-4457 Rev. 3 Feb-2013 KXSS5 Interrupt Features As shown in the application schematic, the KXSS5 features a free-fall interrupt (FF) with an optional high-g motion interrupt (MOT) on the same output pin (FF/MOT). Each interrupt features independent, user-definable thresholds, debounce times, and latch/unlatch capabilities that are customized through the KXSS5’s embedded 8-bit registers or default to factory calibrated values. Free-fall Detection Interrupt - The free-fall interrupt goes high when a free-fall event is detected. A free-fall event occurs when the acceleration on all three accelerometer axes simultaneously falls below the low acceleration threshold for a certain amount of time. The low acceleration threshold and debounce time is set by the user (or default to factory calibrated values) during power up through the embedded 8-bit registers. Also, the free-fall interrupt can be user-defined as latched or unlatched. High-g Motion Interrupt - The optional high-g motion interrupt goes high when a high-g event is detected. A high-g event occurs when the acceleration on any axis exceeds the high acceleration threshold for a certain amount of time. The high acceleration threshold and debounce time is set by the user (or default to factory calibrated values) during power up through the embedded 8-bit registers. The MOT Enable pin enables the Motion interrupt to logically “OR” with the free-fall interrupt onto the FF/MOT pin. Also, the high-g motion interrupt can be user-defined as latched or unlatched. Test Specifications ! Special Characteristics: These characteristics have been identified as being critical to the customer. Every part is tested to verify its conformance to specification prior to shipment. Table 6. Test Specifications Parameter Zero-g Offset @ RT Sensitivity @ RT Current Consumption -- Operating 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com Specification 0.9 +/- 0.048 V 240 +/- 7.2 mV/g 400