EVAL-KXTF9-2050

PART NUMBER: KXTF9-2050 Rev. 7 Jun-2011 e N co ew m m D es en ig de ns d fo r ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications Product Description N ot R The KXTF9 is a tri-axis +/-2g, +/-4g or +/-8g silicon micromachined accelerometer with integrated orientation, tap/double tap, and activity detecting algorithms. 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, and intelligent user-programmable application algorithms. The accelerometer is delivered in a 3 x 3 x 0.9 mm LGA plastic package operating from a 1.8 – 3.6V DC supply. I2C interface is used to communicate to the chip to configure and check updates to the orientation, Directional TapTM detection and activity monitoring algorithms. 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 1 of 49 PART NUMBER: KXTF9-2050 Rev. 7 Jun-2011 e N co ew m m D es en ig de ns d fo r ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications Functional Diagram X Sensor Y Sensor Charge Amp A/D Z Sensor Vdd 5 IO Vdd 1 I 2C Digital Engine Digital Filter GND 4 9 10 N ot R 7 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 2 of 49 PART NUMBER: ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications e N co ew m m D es en ig de ns d fo r KXTF9-2050 Rev. 7 Jun-2011 Product Specifications Table 1. Mechanical (specifications are for operation at 3.3V and T = 25C unless stated otherwise) Parameters Units Min Typical Max Operating Temperature Range ºC -40 - 85 Zero-g Offset mg -125 - +125 Zero-g Offset Variation from RT over Temp. mg/ºC GSEL1=0, GSEL=0 (± 2g) Sensitivity (12-bit) 1 GSEL1=0, GSEL0=1 (± 4g) counts/g GSEL1=1, GSEL0=0 (± 8g) Sensitivity (8-bit) 1 GSEL1=0, GSEL=0 (± 2g) GSEL1=0, GSEL0=1 (± 4g) GSEL1=1, GSEL0=0 (± 8g) counts/g 988 1024 1060 494 512 530 247 61 30 15 256 64 32 16 265 67 34 17 %/ºC 0.01 (xy) 0.03 (z) Offset Ratiometric Error (Vdd = 3.3V ± 5%) % 0.3 Sensitivity Ratiometric Error (Vdd = 3.3V ± 5%) % 0.4 (xy) 0.2 (z) Self Test Output change on Activation g 2.9 (x) 2.7 (y) 1.8 (z) Hz 3500 (xy) 1800 (z) % of FS 1 % 2 R Sensitivity Variation from RT over Temp. Mechanical Resonance (-3dB) Non-Linearity ot Cross Axis Sensitivity Notes: N 0.7 (xy) 0.4 (z) 2 2 1. Resolution and acceleration ranges are user selectable via I C. 2. Resonance as defined by the dampened mechanical sensor. 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 3 of 49 PART NUMBER: ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications e N co ew m m D es en ig de ns d fo r KXTF9-2050 Rev. 7 Jun-2011 Table 2. Electrical (specifications are for operation at 3.3V and T = 25C unless stated otherwise) Parameters Supply Voltage (Vdd) Operating I/O Pads Supply Voltage (VIO) Units Min Typical Max V 1.8 3.3 3.6 V 1.7 All On (Res = 1) Current Consumption All On (RES = 0) 740 A R ms ms kHz Hz RES = 0 RES = 1 kHz Hz 940 0.1 0 0.050 80 40 20 10 5 2.5 20 0.2 * Vio 0.2 * Vio - 400 25 50 1.59 ODR/2 800 N ot Bandwidth (-3dB) 0.9 * Vio 0.8 * Vio A 4 Output Data Rate (ODR) 5 V V V V 840 360 Standby 1 Output Low Voltage Output High Voltage Input Low Voltage Input High Voltage Input Pull-down Current RES = 0 RES = 1, ODR = 25 Hz RES = 1, ODR = 50Hz 2 Start Up Time RES = 1, ODR = 100Hz RES = 1, ODR = 200Hz RES = 1, ODR = 400Hz RES = 1, ODR = 800Hz 3 Power Up Time 2 I C Communication Rate Vdd Notes: 2 1. Assuming I C communication and minimum 1.5k pull-up resistor on SCL and SDA pins. Assuming Vio < 2V, if Vio > 2 V then the maximum Output Low Voltage is 0.4V. 2. Start up time is from PC1 set to valid outputs. 3. Power up time is from Vdd valid to device boot completion. 2 4. User selectable through I C. 5. User selectable and dependant on ODR and RES. 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 4 of 49 PART NUMBER: KXTF9-2050 Rev. 7 Jun-2011 e N co ew m m D es en ig de ns d fo r ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications Table 3. Environmental Units Min Typical Max Supply Voltage (Vdd) Absolute Limits Operating Temperature Range Parameters V ºC -0.3 -40 - 6.0 85 Storage Temperature Range ºC -55 - Mech. Shock (powered and unpowered) g - - ESD V - - 150 5000 for 0.5ms 10000 for 0.2ms 2000 HBM Caution: ESD Sensitive and Mechanical Shock Sensitive Component, improper handling can cause permanent damage to the device. R 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." 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. N ot HF 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 © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 5 of 49 PART NUMBER: KXTF9-2050 Rev. 7 Jun-2011 e N co ew m m D es en ig de ns d fo r ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications Application Schematic SDA 10 IO Vdd C2 1 9 2 8 SCL KXTF9 3 7 4 6 INT 5 C1 R Vdd ot Table 4. KXTF9 Pin Descriptions Name Description 1 2 3 4 5 6 7 8 9 10 IO Vdd DNC DNC GND Vdd DNC INT DNC SCL SDA The power supply input for the digital communication bus. Decouple this pin to ground with a 0.1uF ceramic capacitor. Reserved – Do Not Connect Reserved – Do Not Connect Ground The power supply input. Decouple this pin to ground with a 1uF ceramic capacitor. Reserved – Do Not Connect Physical Interrupt Reserved – Do Not Connect I2C Serial Clock I2C Serial Data N Pin 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 6 of 49 PART NUMBER: ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications e N co ew m m D es en ig de ns d fo r KXTF9-2050 Rev. 7 Jun-2011 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 5. Test Specifications Specification 0 +/- 128 counts 1024 +/- 35.8 counts/g 740 0.866 -0.5 < ay < 0.5 ay < -0.866 -0.5 < ay < 0.5 N ot Table 21. Acceleration at the four orientations with +/- 15° of hysteresis 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 39 of 49 PART NUMBER: KXTF9-2050 Rev. 7 Jun-2011 e N co ew m m D es en ig de ns d fo r ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications The KXTF9 allows the user to change the amount of hysteresis in between the four screen rotation states. By simply writing to the HYST_SET register, the user can adjust the amount of hysteresis up to +/- 45°. The plot in Figure 1 shows the typical amount of hysteresis applied for a given digital count value of HYST_SET. HYST_SET vs Hysteresis 50 45 Hysteresis (+/- degrees) 40 35 30 25 20 15 10 5 0 Hysteresis 0 5 10 15 20 25 30 HYST_SET Value (Counts) N ot R Figure 1. HYST_SET vs Hysteresis 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 40 of 49 PART NUMBER: ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications e N co ew m m D es en ig de ns d fo r KXTF9-2050 Rev. 7 Jun-2011 Device Orientation Angle (aka Tilt Angle) To ensure that horizontal and vertical device orientation changes are detected, even when it isn’t in the ideal vertical orientation – where the angle θ in Figure 2 is 90°, the KXTF9 considers device orientation angle in its algorithm. Angle  Figure 2. Device Orientation Angle ot R As the angle in Figure 2 is decreased, the maximum gravitational acceleration on the X-axis or Y-axis will also decrease. Therefore, when the angle becomes small enough, the user will not be able to make the screen orientation change. When the device orientation angle approaches 0° (device is flat on a desk or table), ax = ay = 0g, az = +1g, and there is no way to determine which way the screen should be oriented, the internal algorithm determines that the device is in either the face-up or facedown orientation, depending on the sign of the z-axis. The KXTF9 will only change the screen orientation when the orientation angle is above the factory-defaulted/user-defined threshold set in the TILT_ANGLE register. Equation 2 can be used to determine what value to write to the TILT_ANGLE register to set the device orientation angle. TILT_ANGLE (counts) = sin θ * (32 (counts/g)) Equation 2. Tilt Angle Threshold N Tilt Timer The 8-bit register, TILT_TIMER can be used to qualify changes in orientation. The KXTF9 does this by incrementing a counter with a size that is specified by the value in TILT_TIMER for each set of acceleration samples to verify that a change to a new orientation state is maintained. A user defined output data rate (ODR) determines the time period for each sample. Equation 3 shows how to calculate the TILT_TIMER register value for a desired delay time. TILT_TIMER (counts) = Delay Time (sec) x ODR (Hz) Equation 3. Tilt Position Delay Time 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 41 of 49 PART NUMBER: ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications e N co ew m m D es en ig de ns d fo r KXTF9-2050 Rev. 7 Jun-2011 Motion Interrupt Feature Description The Motion interrupt feature of the KXTF9 reports qualified high-pass filtered acceleration based on the Wake Up (WUF) threshold. If the high-pass filtered acceleration on any axis is greater than the user-defined wake up threshold (WUF_THRESH), the device has transitioned from an inactive state to an active state. When configured in the unlatched mode, the KXTF9 will report when the motion event finished and the device has returned to an inactive state. Equation 4 shows how to calculate the WUF_THRESH register value for a desired wake up threshold. WUF_THRESH (counts) = Wake Up Threshold (g) x 16 (counts/g) Equation 4. Wake Up Threshold A WUF (WUF_TIMER) 8-bit raw unsigned value represents a counter that permits the user to qualify each active/inactive state change. Note that each WUF Timer count qualifies 1 (one) user-defined ODR period (OWUF). Equation 5 shows how to calculate the WUF_TIMER register value for a desired wake up delay time. WUF_TIMER (counts) = Wake Up Delay Time (sec) x OWUF (Hz) N ot R Equation 5. Wake Up Delay Time 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 42 of 49 PART NUMBER: KXTF9-2050 Rev. 7 Jun-2011 e N co ew m m D es en ig de ns d fo r ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications Figure 3 below shows the latched response of the motion detection algorithm with WUF Timer = 10 counts. Typical Motion Interrupt Example HPF Acceleration WUF Threshold 0g Time Ex: Delay Counter = 10 10 WUF Timer Motion Figure 3. Latched Motion Interrupt Response N ot R Inactive 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 43 of 49 PART NUMBER: KXTF9-2050 Rev. 7 Jun-2011 e N co ew m m D es en ig de ns d fo r ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications Figure 4 below shows the unlatched response of the motion detection algorithm with WUF Timer = 10 counts. Typical Motion Interrupt Example HPF Acceleration WUF Threshold 0g Time Ex: Delay Counter = 10 10 WUF Timer Motion Figure 4. Unlatched Motion Interrupt Response N ot R Inactive 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 44 of 49 PART NUMBER: KXTF9-2050 Rev. 7 Jun-2011 e N co ew m m D es en ig de ns d fo r ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications Directional Tap Detection Feature Description The Directional Tap Detection feature of the KXTF9 recognizes single and double tap inputs and reports the acceleration axis and direction that each tap occurred. Eight performance parameters, as well as a userselectable ODR are used to configure the KXTF9 for a desired tap detection response. Performance Index N ot R The Directional TapTM detection algorithm uses low and high thresholds to help determine when a tap event has occurred. A tap event is detected when the previously described jerk summation exceeds the low threshold (TDT_L_THRESH) for more than the tap detection low limit, but less than the tap detection high limit as contained in TDT_TAP_TIMER. Samples that exceed the high limit (TDT_H_THRESH) will be ignored. Figure 5 shows an example of a single tap event meeting the performance index criteria. 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 45 of 49 PART NUMBER: ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications e N co ew m m D es en ig de ns d fo r KXTF9-2050 Rev. 7 Jun-2011 Calculated Performance Index 180 160 140 jerk (counts) 120 100 80 60 40 20 : Sampled Data TDT_L_THRESH R 0 PI 3.15 3.16 3.17 3.18 time(sec) 3.19 3.2 3.21 Figure 5. Jerk Summation vs Threshold N ot 3.14 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 46 of 49 PART NUMBER: ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications e N co ew m m D es en ig de ns d fo r KXTF9-2050 Rev. 7 Jun-2011 Single Tap Detection The latency timer (TDT_LATENCY_TIMER) sets the time period that a tap event will only be characterized as a single tap. A second tap has to occur outside of the latency timer. If a second tap occurs inside the latency time, it will be ignored as it occurred too quickly. The single tap will be reported at the end of the TDT_WINDOW_TIMER. Figure 6 shows a single tap event meeting the PI, latency and window requirements. Calculated Performance Index 160 PI 140 TDT_WINDOW_TIMER 120 jerk (counts) 100 TDT_LATENCY_TIMER 80 60 R 40 ot TDT_L_THRESH 20 N 0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 time(sec) 2.8 2.9 3 3.1 Figure 6. Single Directional TapTM Timing 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 47 of 49 PART NUMBER: ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications e N co ew m m D es en ig de ns d fo r KXTF9-2050 Rev. 7 Jun-2011 Double Tap Detection An event can be characterized as a double tap only if the second tap crosses the performance index (TDT_L_THRESH) outside the TDT_TIMER. This means that the TDT_TIMER determines the minimum time separation that must exist between the two taps of a double tap event. Similar to the single tap, the second tap event must exceed the performance index for the time limit contained in TDT_TAP_TIMER. The double tap will be reported at the end of the second TDT_LATENCY_TIMER. Figure 7 shows a double tap event meeting the PI, latency and window requirements. Calculated Performance Index PI TDT_WINDOW_TIMER 200 jerk (counts) 150 TDT_TIMER 100 TDT_LATENCY_TIMER R TDT_LATENCY_TIMER 50 ot TDT_L_THRESH N 0 3.1 3.2 3.3 3.4 3.5 time(sec) 3.6 3.7 3.8 3.9 Figure 7. Double Directional TapTM Timing 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 48 of 49 PART NUMBER: KXTF9-2050 Rev. 7 Jun-2011 e N co ew m m D es en ig de ns d fo r ± 2g / 4g / 8g Tri-axis Digital Accelerometer Specifications Revision History REVISION 1 DESCRIPTION Initial Release 2 Corrected default register values and Table 15 references. 3 Removed all references to 12.5 Hz ODR related to acceleration output registers and changed axes labels in Figures 3 and 4. Updated Drawing and Photo with Pin 1 Marking 4 5 6 Modified Output Low Voltage level from 0.3Vio to 0.2Vio. Also modified Note1: Assuming Vio < 2V, if Vio > 2 V then the maximum Output Low Voltage is 0.4V. Updated Z-axis Self Test Output change on Activation from 2.3g to 1.8g. ot R 7 Updated paragraph to include explanation of accelerometer output format in page 17 and updated Figure 9 for 2's complement representation. Updated Static X/Y/Z Output Response versus Orientation. Updated Typical Z Axis Self Test Output DATE 18-Dec2009 16-Mar2010 01-Jul2010 11-Oct2010 29-Mar2011 08-Jun2011 24-Jun2011 N "Kionix" is a registered trademark of Kionix, Inc. Products described herein are protected by patents issued or pending. No license is granted by implication or otherwise under any patent or other rights of Kionix. The information contained herein is believed to be accurate and reliable but is not guaranteed. Kionix does not assume responsibility for its use or distribution. Kionix also reserves the right to change product specifications or discontinue this product at any time without prior notice. This publication supersedes and replaces all information previously supplied. 36 Thornwood Dr. – Ithaca, NY 14850 tel: 607-257-1080 – fax:607-257-1146 www.kionix.com - info@kionix.com © 2010 Kionix – All Rights Reserved 424-2397-1106241613 Page 49 of 49