AN108
Replacing KX022 and KX122 with KX126 Accelerometer
36 Thornwood Dr. — Ithaca, NY 14850 USA
Tel: 607-257-1080 — Fax: 607-257-1146
www.kionix.com — info@kionix.com
© Kionix 2019 All Rights Reserved
15 April 2019
Page 1 of 10
Introduction
The purpose of this application note is to illustrate how the Kionix KX126 accelerometer
can replace an existing Kionix KX022 or KX122 accelerometer.
Side-by-Side Comparison
The following are key side-by-side comparisons between the KX022, KX122, and KX126
accelerometers. Typical values are shown, unless otherwise indicated.
Package Information
KX022
KX122
Parameter
Units
Sensing Axes (Accel)
XYZ 3-axis
XYZ 3-axis
Package Size
mm
2x2x0.9
2x2x0.9
Package Type
LGA
LGA
Pins
16
16
Features
KX022
KX122
KX126
Parameter
Units
Low Power Mode
Yes
Yes
Yes
Self-test
Yes
Yes
Yes
Wake-up
Yes
Yes
Yes*
Back-to-sleep
No
No
Yes
Freefall Detection
No
Yes
Yes
Tap, Double-Tap Detection
Yes
Yes
Yes
Tilt Orientation Detection
Yes
Yes
Yes
Pedometer
No
No
Yes
Sample Buffer (FIFO)
Bytes
256
2048
2048
*
* See Key Differences section for further details
AN108
© Kionix 2019 All Rights Reserved
15 April 2019
Page 2 of 10
Electrical Specifications
KX022
KX122
KX126
Parameter
Units
Supply Voltage (VDD)
V
1.71–3.6
1.71–3.6
1.71–3.6
I/O Pads Supply Voltage (IO_VDD)
V
1.7–3.6
1.7–3.6
1.7–3.6
Current Consumption
(Typical)
High Resolution Mode (RES = 1)
µA
145
145
145
Low Power Mode (RES = 0)
µA
10
10
10
Standby
µA
0.9
0.9
0.9
I
2
C Communication Rate (max)
MHz
3.4
3.4
3.4
SPI Communication Rate (max)
MHz
10
10
10
Output Data Rate [ODR] (max)
KHz
1.6
25.6
25.6
Environmental
KX022
KX122
KX126
Parameter
Units
Supply Voltage (VDD)
V
-0.5–3.63
-0.5–3.63
-0.3–3.63
Operating Temperature
Range
°C
-40–85
-40–85
-40–85
Storage Temperature
Range
°C
-55–150
-55–150
-55–150
Mechanical Shock
(powered and unpowered)
g
5000 for 0.5ms
10000 for 0.2ms
5000 for 0.5ms
10000 for 0.2ms
5000 for 0.5ms
10000 for 0.2ms
ESD (HBM)
V
2000
2000
2000
Accelerometer Mechanical
KX022
KX122
KX126
Parameter
Units
Operating Temperature Range
°C
-40–85
-40–85
-40–85
Zero-g Offset
mg
±25
±25
±25
Zero-g Offset Variation from RT over Temp.
mg/°C
±0.2
±0.2
±0.2
Sensitivity
(Typical)
GSEL1=0, GSEL0=0 (±2g)
counts/g
16384
16384
16384
GSEL1=0, GSEL0=1 (±4g)
counts/g
8192
8192
8192
GSEL1=1, GSEL0=0 (±8g)
counts/g
4096
4096
4096
Sensitivity Variation from RT over Temp.
%/°C
0.01
0.01
0.01
Self-Test Output change on Activation
g
0.5
0.5
0.5
Mechanical Resonance (-3dB)
Hz
-
4000 (xy)
2800 (z)
4000 (xy)
2800 (z)
Non-Linearity
% of FS
0.6
0.6
0.6
Cross Axis Sensitivity
%
2
2
2
Noise (RMS at 50Hz)
mg
0.7
0.7
0.7