KJ‐33000
MEMS Micro Joystick Specification
Knowles Acoustics
1151 Maplewood Drive
Itasca, IL 60143
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Sheet 1 of 9
©2011 Knowles Electronics
KJ‐33000
1. DESCRIPTION AND APPLICATION
1.1 DESCRIPTION
KJ‐33000 is an ultra low‐power MEMS (Micro Electro Mechanical System) based input
device, also known as a joystick. It converts movement of the joystick button up to
1mm from the center into two 4‐bit digital values representing X and Y displacements.
1.2 APPLICATION
Joystick is developed for hand held telecommunication and electronic devices. Refer to
manufacturer’s website (www.knowles.com) for application notes.
2. PART MARKING
Parts are marked with 2 numbers on the top surface of the case.
1234567 ‐ Job identification number
KJ‐33000 ‐ Joystick assembly part number
3. TEMPERATURE RANGE
Operating Temperature Range: ‐25° to 70°C
Storage Temperature Range: ‐40° to 85°C
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Sheet 2 of 9
©2011 Knowles Electronics
KJ‐33000
4. THERORY OF OPERATION
The KJ‐33000 is a silicon MEMS Piezo‐resistive sensor with an integrated CMOS
interface. Piezo‐resistive bridges measure the strain induced in the silicon when a
joystick movement causes internal spring mechanism to place a load on the MEMS.
An A/D converter converts the bridge signal into a 4‐ bit digital code. This code is
communicated to the user via an I²C interface. The 4‐ bit signal is encoded as a
sign/magnitude number. This means that there are two zero values (+/‐0). A
transfer function that is typical for each axis is depicted in the figure below.
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Sheet 3 of 9
©2011 Knowles Electronics
KJ‐33000
5. ELECTRICAL SPECIFICATIONS
5.1 SCHEMATIC DIAGRAM OF CIRCUIT
5.2 Absolute Maximum ratings
Parameter
Symbol
Minimum Maximum
Units
Notes
Power Supply Voltage AVDD, VDD
‐0.3
3.6
V
I/O Voltage
ESD
‐0.3
VDD +0.3
2
V
kV
All pins human body model
VIO
5.3 Recommended Operating Conditions
Parameter
Symbol
Minimum
Typical Maximum Units
Notes
Power Supply Voltage AVDD, VDD
2.6
3.3
3.6
V
I/O Voltage
1.5
1.8
VDD
V
VIO
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Sheet 4 of 9
©2011 Knowles Electronics
KJ‐33000
5.4 ELECTRICAL CHARACTERISTICS UNDER RECOMMENDED OPERATING
CONDITIONS
Typical values at 25°C, VDD = 2.8V
Parameter
Symbol
Minimum
Typical
Maximum
Units
Notes
System Current Operation
IOP
40
100
µA
System Current Low Power
ILP
25
50
µA
System Current Sleep
ISLEEP
3
10
µA
Resolution
RES
16
Counts
Each Axis
Input High Voltage
VIH
0.65 * VIO
V
Input Low Voltage
VIL
0.35 * VIO
V
Output High Voltage
VOH
VIO – 0.3
V
Output Low Voltage
VOL
0.3
V
Input Leakage Current
1.9
9.4
µA
Input Off‐State Leakage Current
0.02
0.04
µA
I²C Clock Rate
fCK
400
kHz
I²C Fast
Mode
Sample Rate – Operation Mode
fSOP
100
Hz
Sample Rate – Low Power Mode
fSLP
10
Hz
Input /
Output
Levels
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Sheet 5 of 9
©2011 Knowles Electronics
KJ‐33000
6. INTERFACE SPECIFICATIONS
6.1 OPERATING MODES:
The KJ‐33000 has three operational modes. When the device is powered up, it is in the
Sleep Mode. Only the I2C interface is active and the current draw is minimized. When
the device is read it wakes up into normal Operation Mode. In this mode, the sensor is
sampled at 100Hz. The first read from Sleep Mode contains stale data. A write to the I2C
address will send the device into either Low Power Mode or Sleep Mode depending on
the value of the least significant bit.
6.2 I2C CONTROLLER
The I2C controller can operate up to 400 KHz (fast mode). Seven bit addressing is
implemented. The pre‐programmed I2C address is 0x38. If the Addr line is tied to VDD,
the device will respond to address 0x39.
A read initiated from the device returns two bytes. The first byte contains a left justified
4 bit value for the X axis while the second byte contains a left justified 4 bit value for the
Y axis. The least significant 4 bits of both bytes are zero filled.
A write initiated to the device will send it into either Low Power Mode or Sleep Mode
depending on the value of the least significant bit. A ‘1’ corresponds to Low Power
Mode while a ‘0’ corresponds to Sleep Mode.
The open drain interrupt line is asserted (low level) on a change in either the X or Y
value. No interrupts are generated when there are consecutive zeros on both axes.
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Sheet 6 of 9
©2011 Knowles Electronics
KJ‐33000
7. MECHANICAL SPECIFICATIONS
ITEM
LENGTH (L)
WIDTH (W)
HEIGHT (H)
POST HEIGHT (P)
DIMENSION
TOLERANCE
UNITS
9.85
9.85
1.65
1.55
±0.10
±0.10
±0.05
±0.05
mm
mm
mm
mm
PIN #
PIN NAME
TYPE
1
2
AVDD
Vio
Source
Source
Analog power supply: 3.3V typical
I/O power supply: either 1.8V or connect to Vdd
3
TEST
Digital I
Test mode select: normally connect to ground
4
Addr
Digital I
Even/Odd address select line
5
SCL
Digital I
I²C clock line
6
INT
Digital O
Open drain interrupt line
7
SDA
8
Vpp
Source
Programming power supply: Connect to Vdd
Digital I/O Open drain I²C data line
9
Vss
Source
Digital Ground
10
Vdd
Source
Digital power supply: 3.3V typical
11
N/C
‐‐‐‐
No Connection
12
AVss
Source
Analog Ground
13
N/C
‐‐‐‐
No Connection
A
Case
‐‐‐‐
Ground
B
Case
‐‐‐‐
Ground
C
Case
‐‐‐‐
Ground
D
Case
‐‐‐‐
Ground
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Sheet 7 of 9
DESCRIPTION
©2011 Knowles Electronics
KJ‐33000
8. PACKAGE DETAIL
Part Number
Reel Width (mm) Reel Diameter (inches) Joystick Quantity on Reel
KJ‐33000‐004
24
13
1500
9. RECOMMENDED REFLOW TEMPERATURE PROFILE
Stage
Temperature Profile Time (Maximum)
Pre‐Heat
170 ~ 180 C
120 sec.
Melt
Above 230 C
100 sec.
Peak
260 C Maximum
30 sec.
Notes
1. Do not board wash after reflow process.
Board washing and cleaning agents can
damage the device.
2. Do not expose to ultrasonic processing or
cleaning.
3. Number of Reflows = Recommended no
more than 3 cycles.
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Sheet 8 of 9
©2011 Knowles Electronics
KJ‐33000
10.RELIABILITY SPECIFICATIONS
Test
Thermal Shock
Description
100 cycles air‐to‐air thermal shock from ‐40oC to +85oC with 15
minutes shock. (IEC 68‐2‐4)
High Temperature Operating 500 hours at 85oC under bias. (IEC 68‐2‐2 Test Ba)
Low Temperature Operating
500 hours at ‐40oC under bias. (IEC 68‐2‐1 Test Aa)
Humidity Operating
85oC/85% R.H. for 500 hours under bias. (JESD22‐A101A‐B)
Sinusoidal Vibration
Random Vibration
Electrostatic Discharge
20G, 20 to 2,000 Hz Sinusoidal sweep; 16 minutes in each
orientation (vertical and horizontal). Mil‐Std‐883E, method
2007.2, condition A; IEC 60068‐2‐6
Acceleration Spectral Densities (m2/s3): 0.10 at 5 Hz, 2.20 at 12
Hz, 2.20 at 20 Hz, and 0.04 at 200 Hz and 500 Hz. 10 minutes in
each orientation (vertical and horizontal). IEC 60068‐2‐34
3 discharges of 8kV direct contact discharge to the case (IEC
6100‐4‐2) and 3 discharges of 2kV direct contact to I/O terminals.
(MIL 883E, Method 3015.7)
Reflow
3 passes through reflow oven with peak temperature of 260oC
Tumble
0.5m for 300 tumbles.
Travel Life Cycles
500,000 Cycles Full Axis Travel.
Max Overload
50N for 5 seconds in the X and Y directions. 100N for 5 seconds in
the Z direction when load is applied to case corner.
11. RELIABILITY SPECIFICATIONS
Stress above the Absolute Maximum Ratings may cause permanent damage to the
device. These are stress ratings only. The device may not function when operated at
these or any other conditions beyond those indicated under “Electrical Specifications”.
Exposure beyond those indicated under “Electrical Specifications” for extended periods
may affect device reliability.
The information contained in this literature is based on our experience to date and is believed to be reliable and it is subject to
change without notice. It is intended as a guide for use by persons having technical skill at their own discretion and risk. We do
not guarantee favorable results or assume any liability in connection with its use. Dimensions contained herein are for reference
purposes only. For specific dimensional requirements consult factory. This publication is not to be taken as a license to operate
under, or recommendation to infringe any existing patents. This supersedes and voids all previous literature.
Revision: A
Release Level: ACTIVE
Sheet 9 of 9
©2011 Knowles Electronics
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