KXTJ2-1009 Specifications Rev 4

PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Product Description
The KXTJ2 is a tri-axis +/-2g, +/-4g or +/-8g silicon
micromachined accelerometer. 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 digital
communications. 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 stable operating
characteristics over the range of input supply voltages and virtually undetectable ratiometric error.
The I2C digital protocol is used to communicate with the chip to configure the part and monitor
outputs.
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Page 1 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Functional Diagram
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Page 2 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Product Specifications
Table 1. Mechanical
(specifications are for operation at 2.6V and T = 25C unless stated otherwise)
Parameters
Units
Min
Typical
Operating Temperature Range
Zero-g Offset
Zero-g Offset Variation from RT over Temp.
Sensitivity (14-bit)
1,2
GSEL1=1, GSEL0=1 (± 8g)
-40
-
85
mg
-
±25
±200
mg/ºC
0.2
counts/g
1024
GSEL1=0, GSEL0=0 (± 2g)
Sensitivity (12-bit)
1
GSEL1=0, GSEL0=1 (± 4g)
1024
counts/g
512
GSEL1=1, GSEL0=0 (± 8g)
256
GSEL1=0, GSEL0=0 (± 2g)
Sensitivity (8-bit)
1
GSEL1=0, GSEL0=1 (± 4g)
64
counts/g
32
%/ºC
0.01
g
1.25 (x)
0.8 (y)
0.6 (z)
Hz
3500 (xy)
1800 (z)
% of FS
0.6
%
2
GSEL1=1, GSEL0=0 (± 8g)
Sensitivity Variation from RT over Temp.
Self Test Output change on Activation
Mechanical Resonance (-3dB)
Non-Linearity
Cross Axis Sensitivity
Notes:
3
Max
ºC
16
2
1. Resolution and acceleration ranges are user selectable via I C.
2. 14-bit Resolution is only available for registers 0x06h – 0x0Bh in the 8g Full Power mode
3. Resonance as defined by the dampened mechanical sensor.
36 Thornwood Dr. – Ithaca, NY 14850
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Page 3 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Table 2. Electrical
(specifications are for operation at 2.6V and T = 25C unless stated otherwise)
Parameters
Units
Min
Typical
Max
Supply Voltage (Vdd)
Operating
I/O Pads Supply Voltage (VIO)
V
1.71
V
1.7
Full Power Mode (RES = 1)
1
Current Consumption Low Power Mode (RES = 0)
2.6
3.6
Vdd
135
A
10
Disabled
0.9
2
V
-
-
0.2 * Vio
Output Low Voltage (Vio > 2V)
2
V
-
-
0.4
Output High Voltage
V
0.8 * Vio
-
-
Input Low Voltage
V
-
-
0.2 * Vio
Input High Voltage
V
0.8 * Vio
-
-
Input Pull-down Current
A
0
ms
~1/ODR
ms
10
Output Low Voltage (Vio < 2V)
Start Up Time
3
Power Up Time
4
2
I C Communication Rate
Bandwidth (-3dB)
6
MHz
3.4
5
Hz
RES = 0
Hz
800
RES = 1
Hz
ODR/2
Output Data Rate (ODR)
0.781
50
1600
Notes:
1. Current varies with Output Data Rate (ODR) see table below.
2
2. For I C communication, this assumes a minimum 1.5k pull-up resistor on SCL and
SDA pins.
3. Start up time is from PC1 set to valid outputs. Time varies with Output Data Rate
(ODR); see chart below
4. Power up time is from Vdd and IO_Vdd valid to device boot completion.
2
5. User selectable through I C.
6. User selectable and dependent on ODR and RES.
36 Thornwood Dr. – Ithaca, NY 14850
tel: 607-257-1080 – fax:607-257-1146
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Page 4 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Table 3 Current Profile
KXTJ2 Representative Current Profile
ODR (Hz)
RES
Current (μA)
0
0.781
1.563
3.125
6.25
12.5
25
50
100
200
400
800
1600
All Rates
Disabled
0
0
0
0
0
0
0
0
0
0
0
0
1
0.9
1.7
2
2.2
3.3
5
9
16
29
57
120
120
120
120
KXTJ2 Representative Current (µA)
1000
120
Current (μA)
100
120
120
57
29
16
10
9
RES = 0
5
3.3
1.7
2
Full Power Mode
2.2
1
0.1
1
10
100
1000
10000
ODR (Hz)
36 Thornwood Dr. – Ithaca, NY 14850
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Page 5 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Table 4 Start Up Time
KXTJ2 Representative Start Up
Time
ODR (Hz)
Start Up Time (ms)
0.781
1240
1.563
621
3.125
309
6.25
151
12.5
80
25
41
50
21
100
11
200
6
400
4
800
3
1600
2
KXTJ2 Start Up Time (ms)
Start Up Time (ms)
10000
1240
1000
621
309
151
100
80
41
21
10
11
6
4
3
2
1
0.1
1
10
100
1000
10000
ODR (Hz)
36 Thornwood Dr. – Ithaca, NY 14850
tel: 607-257-1080 – fax:607-257-1146
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Page 6 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Table 5 Environmental
Parameters
Supply Voltage (Vdd)
Absolute Limits
Units
Min
Typical
Max
V
-0.5
-
3.63
Operating Temperature Range
ºC
-40
-
85
Storage Temperature Range
ºC
-55
-
150
Mech. Shock (powered and unpowered)
g
-
-
5000 for 0.5ms
10000 for 0.2ms
ESD
V
-
-
2000
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.
Floor Life
Factory floor life exposure of the KXCJ9 reels removed from the moisture barrier bag should not
exceed a maximum of 168 hours at 30C/60%RH. If this floor life is exceeded, the parts should be
dried per the IPC/JEDEC J-STD-033A standard.
36 Thornwood Dr. – Ithaca, NY 14850
tel: 607-257-1080 – fax:607-257-1146
www.kionix.com - [email protected]
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595-4464-1303111031
Page 7 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Application Schematic
IO Vdd
SCL
12
11
ADDR
1
10
90
SDA
2
9
Vdd
KXTJ2
3
RES
8
4
7
5
C1
6
C2
INT
Table 6. KXTJ2 Pin Descriptions
Pin
Name
Description
1
2
ADDR
SDA
3
IO Vdd
4
RSVD
I2C programmable address bit – Connect to IO_Vdd or GND
I2C Serial Data
The power supply input for the digital communication bus. Optionally decouple this pin to ground with
a 0.1uF ceramic capacitor.
Reserved – Connect to Vdd, IO Vdd, or GND
5
6
7
8
9
10
INT
GND
Vdd
GND
GND
11
IO Vdd
12
SCL
Vdd
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Physical Interrupt
Ground
The power supply input. Decouple this pin to ground with a 0.1uF ceramic capacitor.
Ground
Ground
The power supply input. Decouple this pin to ground with a 0.1uF ceramic capacitor.
The power supply input for the digital communication bus. Optionally decouple this pin to ground with
a 0.1uF ceramic capacitor.
I2C Serial Clock
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Page 8 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
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 7. Test Specifications
Parameter
Specification
Test Conditions
Zero-g Offset @ RT 0 +/- 205 counts 25C, Vdd = 2.6 V
36 Thornwood Dr. – Ithaca, NY 14850
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Page 9 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Package Dimensions and Orientation
2 x 2 x 0.9 mm LGA
All dimensions and tolerances conform to ASME Y14.5M-1994
36 Thornwood Dr. – Ithaca, NY 14850
tel: 607-257-1080 – fax:607-257-1146
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595-4464-1303111031
Page 10 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Orientation
+X
Pin 1
+Y
+Z
When device is accelerated in +X, +Y or +Z direction, the corresponding output will increase.
Static X/Y/Z Output Response versus Orientation to Earth’s surface (1g):
GSEL1=0, GSEL0=0 (± 2g)
Position
1
2
3
4
Diagram
Resolution (bits)
X (counts)
Y (counts)
Z (counts)
X-Polarity
Y-Polarity
Z-Polarity
12
8
12
8
12
8
1024 64
0
0 -1024 -64
0
0 -1024 -64
0
0
0
0
0
0
0
0
0
0
+
0
0
0
0
0
0
12
0
1024
0
0
+
0
5
Top
6
Bottom
Bottom
Top
8
12
8
12
8
0
0
0
0
0
64
0
0
0
0
0 1024 64 -1024 -64
0
0
+
0
0
-
(1g)
Earth’s Surface
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Page 11 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Static X/Y/Z Output Response versus Orientation to Earth’s surface (1g):
GSEL1=0, GSEL0=1 (± 4g)
Position
1
2
3
4
Diagram
Resolution (bits)
X (counts)
Y (counts)
Z (counts)
X-Polarity
Y-Polarity
Z-Polarity
12
8
512 32
0
0
0
0
0
+
0
0
12
8
12
0
0 -512
-512 -32
0
0
0
0
0
0
8
-32
0
0
12
0
512
0
0
0
8
0
32
0
0
+
0
5
Top
6
Bottom
Bottom
Top
12
0
0
512
8
0
0
32
12
0
0
-512
0
0
+
8
0
0
-32
0
0
-
(1g)
Earth’s Surface
Static X/Y/Z Output Response versus Orientation to Earth’s surface (1g):
GSEL1=1, GSEL0=0 (± 8g)
Position
1
2
3
4
Diagram
Resolution (bits)
X (counts)
Y (counts)
Z (counts)
X-Polarity
Y-Polarity
Z-Polarity
12
8
256 16
0
0
0
0
0
+
0
0
12
8
12
0
0 -256
-256 -16
0
0
0
0
0
0
8
-16
0
0
0
0
(1g)
12
0
256
0
8
0
16
0
0
+
0
5
Top
6
Bottom
Bottom
Top
12
0
0
256
0
0
+
8
0
0
16
12
0
0
-256
8
0
0
-16
0
0
-
Earth’s Surface
36 Thornwood Dr. – Ithaca, NY 14850
tel: 607-257-1080 – fax:607-257-1146
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Page 12 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
KXTJ2 Digital Interface
The Kionix KXTJ2 digital accelerometer has the ability to communicate on the I2C digital serial interface bus.
This allows for easy system integration by eliminating analog-to-digital converter requirements and by
providing direct communication with system micro-controllers.
The serial interface terms and descriptions as indicated in Table 8. Serial Interface Terminologies
below will be observed throughout this document.
Term
Transmitter
Receiver
Master
Slave
Description
The device that transmits data to the bus.
The device that receives data from the bus.
The device that initiates a transfer, generates clock signals, and terminates a transfer.
The device addressed by the Master.
Table 8. Serial Interface Terminologies
I2C Serial Interface
As previously mentioned, the KXTJ2 has the ability to communicate on an I2C bus. I2C is primarily used for
synchronous serial communication between a Master device and one or more Slave devices. The Master,
typically a micro controller, provides the serial clock signal and addresses Slave devices on the bus. The
KXTJ2 always operates as a Slave device during standard Master-Slave I2C operation.
I2C is a two-wire serial interface that contains a Serial Clock (SCL) line and a Serial Data (SDA) line. SCL is a
serial clock that is provided by the Master, but can be held low by any Slave device, putting the Master into a
wait condition. SDA is a bi-directional line used to transmit and receive data to and from the interface. Data is
transmitted MSB (Most Significant Bit) first in 8-bit per byte format, and the number of bytes transmitted per
transfer is unlimited. The I2C bus is considered free when both lines are high. The I2C interface is compliant
with high-speed mode, fast mode and standard mode I2C standards.
36 Thornwood Dr. – Ithaca, NY 14850
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Page 13 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
SDA SCL
KXTJ2-1009
Rev. 4
Mar-2013
IO_Vdd
SDA
MCU
SCL
SDA
KXTJ2
SCL
ADDR
SDA
KXTJ2
SCL
ADDR
Figure 1. Multiple KXTJ2 I2C Connection
I2C Operation
Transactions on the I2C bus begin after the Master transmits a start condition (S), which is defined as a highto-low transition on the data line while the SCL line is held high. The bus is considered busy after this
condition. The next byte of data transmitted after the start condition contains the Slave Address (SAD) in the
seven MSBs (Most Significant Bits), and the LSB (Least Significant Bit) tells whether the Master will be
receiving data ‘1’ from the Slave or transmitting data ‘0’ to the Slave. When a Slave Address is sent, each
device on the bus compares the seven MSBs with its internally stored address. If they match, the device
considers itself addressed by the Master. The KXTJ2’s Slave Address is comprised of a programmable part
and a fixed part, which allows for connection of multiple KXTJ2's to the same I2C bus. The Slave Address
associated with the KXTJ2 is 000111X, where the programmable bit, X, is determined by the assignment of
ADDR (pin 1) to GND or IO_Vdd. Figure 1 above shows how two KXTJ2's would be implemented on an I2C
bus.
It is mandatory that receiving devices acknowledge (ACK) each transaction. Therefore, the transmitter must
release the SDA line during this ACK pulse. The receiver then pulls the data line low so that it remains stable
low during the high period of the ACK clock pulse. A receiver that has been addressed, whether it is Master or
Slave, is obliged to generate an ACK after each byte of data has been received. To conclude a transaction,
the Master must transmit a stop condition (P) by transitioning the SDA line from low to high while SCL is high.
The I2C bus is now free.
36 Thornwood Dr. – Ithaca, NY 14850
tel: 607-257-1080 – fax:607-257-1146
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Page 14 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Writing to a KXTJ2 8-bit Register
Upon power up, the Master must write to the KXTJ2’s control registers to set its operational mode. Therefore,
when writing to a control register on the I2C bus, as shown Sequence 1 on the following page, the following
protocol must be observed: After a start condition, SAD+W transmission, and the KXTJ2 ACK has been
returned, an 8-bit Register Address (RA) command is transmitted by the Master. This command is telling the
KXTJ2 to which 8-bit register the Master will be writing the data. Since this is I 2C mode, the MSB of the RA
command should always be zero (0). The KXTJ2 acknowledges the RA and the Master transmits the data to
be stored in the 8-bit register. The KXTJ2 acknowledges that it has received the data and the Master
transmits a stop condition (P) to end the data transfer. The data sent to the KXTJ2 is now stored in the
appropriate register. The KXTJ2 automatically increments the received RA commands and, therefore, multiple
bytes of data can be written to sequential registers after each Slave ACK as shown in Sequence 2 on the
following page.
Reading from a KXTJ2 8-bit Register
When reading data from a KXTJ2 8-bit register on the I2C bus, as shown in Sequence 3 on the next page, the
following protocol must be observed: The Master first transmits a start condition (S) and the appropriate Slave
Address (SAD) with the LSB set at ‘0’ to write. The KXTJ2 acknowledges and the Master transmits the 8-bit
RA of the register it wants to read. The KXTJ2 again acknowledges, and the Master transmits a repeated start
condition (Sr). After the repeated start condition, the Master addresses the KXTJ2 with a ‘1’ in the LSB
(SAD+R) to read from the previously selected register. The Slave then acknowledges and transmits the data
from the requested register. The Master does not acknowledge (NACK) it received the transmitted data, but
transmits a stop condition to end the data transfer. Note that the KXTJ2 automatically increments through its
sequential registers, allowing data to be read from multiple registers following a single SAD+R command as
shown below in Sequence 4 on the following page. The 8-bit register data is transmitted using a left-most
format, first bit shifted/clocked out being the MSB bit.
If a receiver cannot transmit or receive another complete byte of data until it has performed some other
function, it can hold SCL low to force the transmitter into a wait state. Data transfer only continues when the
receiver is ready for another byte and releases SCL.
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Page 15 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Data Transfer Sequences
The following information clearly illustrates the variety of data transfers that can occur on the I 2C bus and how
the Master and Slave interact during these transfers. Table 9 defines the I2C terms used during the data
transfers.
Term
S
Sr
SAD
W
R
ACK
NACK
RA
Data
P
Definition
Start Condition
Repeated Start Condition
Slave Address
Write Bit
Read Bit
Acknowledge
Not Acknowledge
Register Address
Transmitted/Received Data
Stop Condition
Table 9. I2C Terms
Sequence 1. The Master is writing one byte to the Slave.
Master
Slave
S
SAD + W
RA
ACK
DATA
ACK
P
ACK
Sequence 2. The Master is writing multiple bytes to the Slave.
Master
Slave
S
SAD + W
RA
ACK
DATA
ACK
DATA
ACK
P
ACK
Sequence 3. The Master is receiving one byte of data from the Slave.
Master
Slave
S
SAD + W
RA
ACK
Sr
SAD + R
ACK
NACK
ACK
P
DATA
Sequence 4. The Master is receiving multiple bytes of data from the Slave.
Master
Slave
S
SAD + W
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RA
ACK
Sr
ACK
SAD + R
ACK
ACK
DATA
NACK
DATA
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Page 16 of 31
P
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
KXTJ2 Embedded Registers
The KXTJ2 has 20 embedded 8-bit registers that are accessible by the user. This section contains the
addresses for all embedded registers and also describes bit functions of each register. Table 8 below
provides a listing of the accessible 8-bit registers and their addresses.
Register Name
Type
Read/Write
I2C Address
Hex
Binary
Kionix Reserved
-
0x00 – 0x05
-
XOUT_L
R
0x06
0000 0110
XOUT_H
R
0x07
0000 0111
YOUT_L
R
0x08
0000 1000
YOUT_H
R
0x09
0000 1001
ZOUT_L
R
0x0A
0000 1010
ZOUT_H
R
0x0B
0000 1011
DCST_RESP
R
0x0C
0000 1100
Kionix Reserved
-
0x0D – 0x0E
-
WHO_AM_I
R
0x0F
0000 1111
Kionix Reserved
-
0x10 – 0x15
-
INT_SOURCE1
R
0x16
0001 0110
INT_SOURCE2
R
0x17
0001 0111
STATUS_REG
R
0x18
0001 1000
Kionix Reserved
-
0x19
-
INT_REL
R
0x1A
0001 1010
CTRL_REG1*
R/W
0x1B
0001 1011
Kionix Reserved
-
0x1C
0001 1100
CTRL_REG2*
R/W
0x1D
0001 1101
INT_CTRL_REG1*
R/W
0x1E
0001 1110
INT_CTRL_REG2*
R/W
0x1F
0001 1111
Kionix Reserved
-
0x20
0010 0000
DATA_CTRL_REG*
R/W
0x21
0010 0001
Kionix Reserved
-
0x22 – 0x28
-
WAKEUP_TIMER*
R/W
0x29
0010 1001
Kionix Reserved
-
0x2A – 0x39
-
SELF_TEST
R/W
0x3A
0011 1010
Kionix Reserved
-
0x3B – 0x69
-
WAKUP_THRESHOLD*
R/W
0x6A
0110 1010
* Note: When changing the contents of these registers, the PC1 bit in CTRL_REG1 must first be set to “0”.
Table 10. KXTJ2 Register Map
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Page 17 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
KXTJ2 Register Descriptions
Accelerometer Outputs
These registers contain up to 12-bits of valid acceleration data for each axis depending on the setting
of the RES bit in CTRL_REG1, where the acceleration outputs are represented in 12-bit valid data
when RES = ‘1’ and 8-bit valid data when RES = ‘0’. The data is updated every user-defined ODR
period, is protected from overwrite during each read, and can be converted from digital counts to
acceleration (g) per Table 11 below. The register acceleration output binary data is represented in 2’s
complement format. For example, if N = 12 bits, then the Counts range is from -2048 to 2047, and if N
= 8 bits, then the Counts range is from -128 to 127.
12-bit
Register Data
Equivalent
(2’s complement) Counts in decimal
Range = +/-2g
Range = +/-4g
Range = +/-8g
0111 1111 1111
2047
+1.999g
+3.998g
+7.996g
0111 1111 1110
2046
+1.998g
+3.996g
+7.992g
…
…
…
…
…
0000 0000 0001
1
+0.001g
+0.002g
+0.004g
0000 0000 0000
0
0.000g
0.000g
0.000g
1111 1111 1111
-1
-0.001g
-0.002g
-0.004g
…
…
…
…
…
1000 0000 0001
-2047
-1.999g
-3.998g
-7.996g
1000 0000 0000
-2048
-2.000g
-4.000g
-8.000g
Range = +/-2g
Range = +/-4g
Range = +/-8g
8-bit
Register Data
Equivalent
(2’s complement) Counts in decimal
0111 1111
127
+1.984g
+3.968g
+7.936g
0111 1110
126
+1.968g
+3.936g
+7.872g
…
…
…
…
…
0000 0001
1
+0.016g
+0.032g
+0.064g
0000 0000
0
0.000g
0.000g
0.000g
1111 1111
-1
-0.016g
-0.032g
-0.064g
…
…
…
…
…
1000 0001
-127
-1.984g
-3.968g
-7.936g
1000 0000
-128
-2.000g
-4.000g
-8.000g
Table 11. Acceleration (g) Calculation
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Page 18 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
XOUT_L
X-axis accelerometer output least significant byte
R
XOUTD3
Bit7
R
XOUTD2
Bit6
R
XOUTD1
Bit5
R
XOUTD0
Bit4
R
X
Bit3
R
X
Bit2
R
R
X
X
Bit1
Bit0
2
I C Address: 0x06h
XOUT_H
X-axis accelerometer output most significant byte
R
R
R
XOUTD11 XOUTD10 XOUTD9
Bit7
Bit6
Bit5
R
XOUTD8
Bit4
R
XOUTD7
Bit3
R
R
R
XOUTD6 XOUTD5 XOUTD4
Bit2
Bit1
Bit0
2
I C Address: 0x07h
YOUT_L
Y-axis accelerometer output least significant byte
R
YOUTD3
Bit7
R
YOUTD2
Bit6
R
YOUTD1
Bit5
R
YOUTD0
Bit4
R
X
Bit3
R
X
Bit2
R
R
X
X
Bit1
Bit0
2
I C Address: 0x08h
YOUT_H
Y-axis accelerometer output most significant byte
R
R
R
YOUTD11 YOUTD10 YOUTD9
Bit7
Bit6
Bit5
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R
YOUTD8
Bit4
R
YOUTD7
Bit3
R
R
R
YOUTD6 YOUTD5 YOUTD4
Bit2
Bit1
Bit0
2
I C Address: 0x09h
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Page 19 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
ZOUT_L
Z-axis accelerometer output least significant byte
R
ZOUTD3
Bit7
R
ZOUTD2
Bit6
R
ZOUTD1
Bit5
R
ZOUTD0
Bit4
R
X
Bit3
R
X
Bit2
R
R
X
X
Bit1
Bit0
2
I C Address: 0x0Ah
ZOUT_H
Z-axis accelerometer output most significant byte
R
R
R
ZOUTD11 ZOUTD10 ZOUTD9
Bit7
Bit6
Bit5
R
ZOUTD8
Bit4
R
ZOUTD7
Bit3
R
R
R
ZOUTD6 ZOUTD5 ZOUTD4
Bit2
Bit1
Bit0
2
I C Address: 0x0Bh
DCST_RESP
This register can be used to verify proper integrated circuit functionality. It always has a byte value of
0x55h unless the DCST bit in CTRL_REG3 is set. At that point this value is set to 0xAAh. The byte
value is returned to 0x55h after reading this register.
R
DCSTR7
Bit7
R
DCSTR6
Bit6
R
DCSTR5
Bit5
R
DCSTR4
Bit4
R
DCSTR3
Bit3
R
DCSTR2
Bit2
R
R
DCSTR1 DCSTR0
Bit1
Bit0
2
I C Address: 0x0Ch
Reset Value
01010101
WHO_AM_I
This register can be used for supplier recognition, as it can be factory written to a known byte value.
The default value is 0x09h.
R
WIA7
Bit7
R
WIA6
Bit6
R
WIA5
Bit5
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R
WIA4
Bit4
R
WIA3
Bit3
R
WIA2
Bit2
R
R
WIA1
WIA0
Bit1
Bit0
2
I C Address: 0x0Fh
Reset Value
00001001
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Page 20 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Interrupt Source Registers
These two registers report interrupt state changes. This data is updated when a new interrupt event
occurs and each application’s result is latched until the interrupt release register is read. The
programmable interrupt engine can be configured to report data in an unlatched manner via the
interrupt control registers.
INT_SOURCE1
This register reports which function caused an interrupt. Reading from the interrupt release register
(INT_REL, 0x1Ah) will clear the entire contents of this register.
R
0
Bit7
R
0
Bit6
R
0
Bit5
R
DRDY
Bit4
R
0
Bit3
R
0
Bit2
R
R
WUFS
0
Bit1
Bit0
2
I C Address: 0x16h
DRDY - indicates that new acceleration data (at Reg Addr 0x06h to 0x0Bh) is available. This
bit is cleared when acceleration data is read or the interrupt release register
(INT_REL, 0x1Ah) is read.
0 = New acceleration data not available
1 = New acceleration data available
WUFS - Wake up, This bit is cleared when the interrupt source latch register (INT_REL,
ox1Ah) is read.
0 = No motion
1 = Motion has activated the interrupt
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Page 21 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
INT_SOURCE2
This register reports the axis and direction of detected motion per Table 12. This register is cleared
when the interrupt source latch register (INT_REL, 0x1Ah) is read.
R
0
Bit7
R
0
Bit6
R
XNWU
Bit5
R
XPWU
Bit4
Bit
XNWU
XPWU
YNWU
YPWU
ZNWU
ZPWU
R
YNWU
Bit3
R
YPWU
Bit2
R
R
ZNWU
ZPWU
Bit1
Bit0
2
I C Address: 0x17h
Description
X Negative (X-) Reported
X Positive (X+) Reported
Y Negative (Y-) Reported
Y Positive (Y+) Reported
Z Negative (Z-) Reported
Z Positive (Z+) Reported
Table 12. KXTJ2 Motion Reporting
STATUS_REG
This register reports the status of the interrupt.
R
0
Bit7
R
0
Bit6
R
0
Bit5
R
INT
Bit4
R
0
Bit3
R
0
Bit2
R
R
0
0
Bit1
Bit0
2
I C Address: 0x18h
INT reports the combined (OR) interrupt information of DRDY and WUFS in the interrupt
source register (INT_SOURCE1, 0x16h). This bit is cleared when acceleration data is
read or the interrupt release register (INT_REL, 1Ah) is read.
0 = no interrupt event
1 = interrupt event has occurred
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Page 22 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
INT_REL
Latched interrupt source information (INT_SOURCE1, 0x16h and INT_SOURCE2, 0x17h) is cleared
and physical interrupt latched pin (7) is changed to its inactive state when this register is read.
R
X
Bit7
R
X
Bit6
R
X
Bit5
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R
X
Bit4
R
X
Bit3
R
X
Bit2
R
R
X
X
Bit1
Bit0
2
I C Address: 0x1Ah
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Page 23 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
CTRL_REG1
Read/write control register that controls the main feature set.
R/W
PC1
Bit7
R/W
RES
Bit6
R/W
DRDYE
Bit5
R/W
GSEL1
Bit4
R/W
GSEL0
Bit3
R/W
0
Bit2
R/W
R/W
WUFE
0
Bit1
Bit0
2
I C Address: 0x1Bh
Reset Value
00000000
PC1 controls the operating mode of the KXTJ2.
0 = stand-by mode
1 = operating mode
RES determines the performance mode of the KXTJ2. Note that to change the value of this
bit, the PC1 bit must first be set to “0”.
0 = low current, 8-bit valid. Only available for ODR <= 200 Hz. Bandwidth (Hz) = 800
1 = high current, 12-bit or 14-bit valid. Bandwidth (Hz) = ODR/2
DRDYE enables the reporting of the availability of new acceleration data as an interrupt. Note
that to change the value of this bit, the PC1 bit must first be set to “0”.
0 = availability of new acceleration data is not reflected as an interrupt
1 = availability of new acceleration data is reflected as an interrupt
GSEL1, GSEL0 selects the acceleration range of the accelerometer outputs per Table 13.
Note that to change the value of this bit, the PC1 bit must first be set to “0”.
GSEL1 GSEL0
0
0
0
1
1
0
1
1
Range
+/-2g
+/-4g
+/-8g
+/-8g1
Table 13. Selected Acceleration Range
WUFE enables the Wake Up (motion detect) function. 0= disabled, 1= enabled. Note that to
change the value of this bit, the PC1 bit must first be set to “0”.
0 = Wake Up function disabled
1 = Wake Up function enabled
1
This is a 14-bit mode available only in Full Power mode and only for Registers 0x06h-0x0Bh
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Page 24 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
CTRL_REG2
Read/write control register that provides more feature set control. Note that to properly change the
value of this register, the PC1 bit in CTRL_REG1 must first be set to “0”.
R/W
SRST
Bit7
R/W
reserved
Bit6
R/W
reserved
Bit5
R/W
DCST
Bit4
R/W
reserved
Bit3
R/W
OWUFA
Bit2
R/W
R/W
OWUFB OWUFC
Bit1
Bit0
2
I C Address: 0x1Dh
Reset Value
00000000
SRST initiates software reset, which performs the RAM reboot routine. This bit will remain 1
until the RAM reboot routine is finished.
SRST = 0 – no action
SRST = 1 – start RAM reboot routine
DCST initiates the digital communication self-test function.
DCST = 0 – no action
DCST = 1 – sets ST_RESP register to 0xAAh and when ST_RESP is read, sets this
bit to 0 and sets ST_RESP to 0x55h
OWUFA, OWUFB, OWUFC sets the Output Data Rate for the Wake Up function (motion
detection) per Table 14 below
Wake Up function
OWUFA OWUFB OWUFC Output Data Rate
0
0
0
0.781Hz
0
0
1
1.563Hz
0
1
0
3.125Hz
0
1
1
6.25Hz
1
0
0
12.5Hz
1
0
1
25Hz
1
1
0
50Hz
1
1
1
100Hz
Table 14. Output Data Rate for Wake Up Function
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Page 25 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
INT_CTRL_REG1
This register controls the settings for the physical interrupt pin (7). Note that to properly change the
value of this register, the PC1 bit in CTRL_REG1 must first be set to “0”.
R/W
0
Bit7
R/W
0
Bit6
R/W
IEN
Bit5
R/W
IEA
Bit4
R/W
IEL
Bit3
R/W
0
Bit2
R/W
R/W
0
0
Bit1
Bit0
2
I C Address: 0x1Eh
Reset Value
00010000
IEN enables/disables the physical interrupt pin (7)
IEN = 0 – physical interrupt pin (7) is disabled
IEN = 1 – physical interrupt pin (7) is enabled
IEA sets the polarity of the physical interrupt pin (7)
IEA = 0 – polarity of the physical interrupt pin (7) is active low
IEA = 1 – polarity of the physical interrupt pin (7) is active high
IEL sets the response of the physical interrupt pin (7)
IEL = 0 – the physical interrupt pin (7) latches until it is cleared by reading INT_REL
IEL = 1 – the physical interrupt pin (7) will transmit one pulse with a period of 0.03 0.05ms
INT_CTRL_REG2
This register controls which axis and direction of detected motion can cause an interrupt. Note that to
properly change the value of this register, the PC1 bit in CTRL_REG1 must first be set to “0”.
R/W
0
Bit7
R/W
0
Bit6
R/W
XNWUE
Bit5
R/W
XPWUE
Bit4
R/W
YNWUE
Bit3
R/W
YPWUE
Bit2
R/W
R/W
ZNWUE ZPWUE
Bit1
Bit0
2
I C Address: 0x1Fh
Reset Value
00111111
XNWU - x negative (x-): 0 = disabled, 1 = enabled
XPWU - x positive (x+): 0 = disabled, 1 = enabled
YNWU - y negative (y-): 0 = disabled, 1 = enabled
YPWU - y positive (y+): 0 = disabled, 1 = enabled
ZNWU - z negative (z-): 0 = disabled, 1 = enabled
ZPWU - z positive (z+): 0 = disabled, 1 = enabled
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Page 26 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
DATA_CTRL_REG
Read/write control register that configures the acceleration outputs. Note that to properly change the
value of this register, the PC1 bit in CTRL_REG1 must first be set to “0”.
R/W
0
Bit7
R/W
0
Bit6
R/W
0
Bit5
R/W
0
Bit4
R/W
OSAA
Bit3
R/W
OSAB
Bit2
R/W
R/W
OSAC
OSAD
Bit1
Bit0
2
I C Address: 0x21h
Reset Value
00000010
OSAA, OSAB, OSAC, OSAD sets the output data rate (ODR) for the low-pass filtered acceleration
outputs per Table 15.
OSAA
1
1
1
1
0
0
0
0
0
0
0
0
OSAB
0
0
0
0
0
0
0
0
1
1
1
1
OSAC
0
0
1
1
0
0
1
1
0
0
1
1
OSAD
0
1
0
1
0
1
0
1
0
1
0
1
Output Data Rate
0.781Hz
1.563Hz
3.125Hz
6.25Hz
12.5Hz
25Hz
50Hz
100Hz
200Hz
400Hz
800Hz
1600Hz
LPF Roll-Off
0.3905Hz
0.781Hz
1.563Hz
3.125Hz
6.25Hz
12.5Hz
25Hz
50Hz
100Hz
200Hz
400Hz
800Hz
Table 15. Acceleration Output Data Rate (ODR) and LPF Roll-Off
Note: Output Data Rates >= 400Hz will force device into Full Power mode
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Page 27 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
WAKEUP_TIMER
This register sets the time motion must be present before a wake-up interrupt is set. Every count is
calculated as 1/OWUF delay period. Note that to properly change the value of this register, the PC1 bit
in CTRL_REG1 must first be set to “0”. Valid entries are from 1 to 255, excluding the zero value.
R/W
WUFC7
Bit7
R/W
WUFC6
Bit6
R/W
WUFC5
Bit5
R/W
WUFC4
Bit4
R/W
WUFC3
Bit3
R/W
WUFC2
Bit2
R/W
R/W
WUFC1
WUFC0
Bit1
Bit0
2
I C Address: 0x29h
Reset Value
00000000
SELF_TEST
When 0xCA is written to this register, the MEMS self-test function is enabled. Electrostatic-actuation of
the accelerometer, results in a DC shift of the X, Y and Z axis outputs. Writing 0x00 to this register will
return the accelerometer to normal operation.
R/W
1
Bit7
R/W
1
Bit6
R/W
0
Bit5
R/W
0
Bit4
R/W
1
Bit3
R/W
0
Bit2
R/W
R/W
1
0
Bit1
Bit0
2
I C Address: 0x3Ah
Reset Value
00000000
WAKEUP_THRESHOLD
This register sets the threshold for wake-up (motion detect) interrupt is set. The KXTJ2 will ship from
the factory with this value set to correspond to a change in acceleration of 0.5g. Note that to properly
change the value of this register, the PC1 bit in CTRL_REG1 must first be set to “0”.
R/W
WUTH7
Bit7
R/W
WUTH6
Bit6
R/W
WUTH5
Bit5
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R/W
WUTH4
Bit4
R/W
WUTH3
Bit3
R/W
WUTH2
Bit2
R/W
R/W
WUTH1
WUTH0
Bit1
Bit0
2
I C Address: 0x6Ah
Reset Value
00001000
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Page 28 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
KXTJ2 Embedded Wake Up Function
The KXTJ2 contains an interrupt engine that can be configured by the user to report when qualified changes in
acceleration occur. The user has the option to enable or disable specific axes and specific directions, as well
as to specify the delay time. An example use case for the engine would be to detect motion on any axis to
signal an event and wake up the accelerometer or other devices. This can be achieved by configuring the
engine to detect when the acceleration on any axis is greater than the user-defined threshold for a userdefined amount of time.
Equations 1 and 2 show how to calculate the engine threshold
(WAKEUP_THRESHOLD) and delay time (WAKEUP_TIMER) register values for the desired result.
WAKEUP_THRESHOLD (counts) = Desired Threshold (g) x 16 (counts/g)
Equation 1. Wake Up Threshold
Note that this defined threshold is differential with respect to the previous reading. This threshold is constantly
compared with the result of the differential acceleration (Future reading(g) – Previous reading(g)). For
example, if the threshold is set to 0.4g and it is previously experiencing a 1g acceleration in the axis and the
future reading is still 1g, then the differential acceleration value is 0 g, and this case will not exceed the
threshold of 0.4g and no interrupt can be generated. On the other hand, if it is previously experiencing a 1g
acceleration in the axis and the future reading changed to 1.6g, then the differential acceleration value is 0.6 g
and in this case it will exceed the threshold of 0.4g and the interrupt will be generated. The Wake Up Delay
Time in counts is defined as follows:
WAKEUP_TIMER (counts) = Desired Delay Time (sec) x OWUF (Hz)
Equation 2. Wake Up Delay Time
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Page 29 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Figure 2 below shows the latched response of the Wake Up Function with WUF Timer = 10 counts.
Typical Wake Up Interrupt Example
Differential Acceleration
WUF Threshold
0g
10
WUF Timer
Ex: Delay Counter = 10
Motion
Inactive
Figure 2. Latched Motion Interrupt Response
The KXTJ2 wake-up function is always latched. However, if the INT_CTROL_REG1 is set with IEL = 1, then
upon a wake-up event the WUF interrupt signal will pulse and return low, but only once. The WUF interrupt
output will not reset until a read of the INT_REL latch reset register.
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Page 30 of 31
PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTJ2-1009
Rev. 4
Mar-2013
Revision History
REVISION
1
2
3
4
DESCRIPTION
Initial Release
Update to include ADDR Pin description Connect to IO_Vdd or GND
Updated Floor Life Spec
updated table 7 to match Table 1, updated self test spec
DATE
27-Sep-2012
26-Nov-2012
06-Dec-2012
11-Mar-2013
"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 - [email protected]
© 2012 Kionix – All Rights Reserved
595-4464-1303111031
Page 31 of 31