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FX29
Compact Compression Load Cell
Versatile Miniature Force Sensor
mV, Amplified, and Digital Outputs
Low Power Consumption
Rugged Microfused Sensing Element
Stainless Steel Enclosure
Several Load Ranges
TE Connectivity’s (TE) FX29 is a compact compression load cell
that offers exceptional price-to-performance in a robust sensor
package. Optimized for embedded force sensing applications from
disposable medical devices to durable appliances and exercise
equipment. The FX29 allows design flexibility with mV, amplified,
and digital output options.
Features
• Compact Design
The FX29 incorporates the high reliability Microfused technology
and is offered in ranges from 10lbf to 200lbf (50N to 1000N).
Microfused technology provides excellent span and zero stability,
outstanding cycle life, superior resolution, high over-range
capabilities, and an unamplified span sensitivity of 20mV/V.
• mV or Amplified Analog Outputs
• Optional I2C Digital Interface
• High Over Range Capability
The FX29 utilizes a two-piece construction of stainless steel
materials. The combination of a metal injection molded flexure and
micro miniaturized MEMS strain gauges allows flexibility of force
range options for a lower cost sensor. These improvements over
previous load cell designs give the FX29 more precise
dimensional control and better performance.
Applications
• Medical Infusion Pumps
• Analog & Digital Scales
• Fitness & Exercise Equipment
• Payload Weighing
• Power Tools
• Robotics
• Surgical & Dental Tools
• Battery Powered Devices
• Manufacturing Equipment
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CONNECT WITH A SPECIALIST
TE CONNECTIVITY SENSORS /// FX29
DOC CONTROL NUMBER 05142019
10/2020
Page 1
FX29
Compact Compression Load Cell
Absolute Maximum Ratings (Analog) (1)
Parameter
Symbol
Supply voltage
Vdd
Storage temperature
TS
Compressive load
Min
Typ
Max
Units
Notes/Conditions
6.0
V
Analog mV Output
5.25
V
Analog 0.5-4.5V Output
+85
°C
2.5X
Rated
4.0
kV
Human Body Model
Max
Units
Notes/Conditions
1.00
6.0
V
mV Output only
4.75
5.25
V
0.5-4.5V Output only
3
mA
0.5-4.5V Output only
-40
Lmax
ESD
-4.0
(1) Maximum
limits the device will withstand without damage
Standard Load Ranges
Pounds-Force (lbf)
10
Newtons (N)
50
25
125
50
250
100
500
200
1000
Electrical Specifications (Analog)
(Unless otherwise specified, all parameters are measured at 25°C @ 5.0V applied)
Parameter
Symbol
Min
Typ
Supply voltage (Vsupply)
Vdd
Operating current
Idd
Input resistance
Rin
2.4
3.0
3.6
kΩ
mV Output only
Output resistance
Rout
1.76
2.2
2.64
kΩ
mV Output only
2.0
ms
10% to 90%
mA
0.5-4.5V Output only
seconds
0.5-4.5V Output only
MΩ
@250VDC
Rise time
Tr
Maximum output current
Io
Output short circuit duration
Ts
Insulation resistance
2.2
50
Bandwidth
TE CONNECTIVITY SENSORS /// FX29
∞
1.0
DOC CONTROL NUMBER 05142019
kHz
10/2020
Page 2
FX29
Compact Compression Load Cell
Operating Specifications (Analog)
(Unless otherwise specified, all parameters are measured at 25°C @ 5.0V applied)
Parameter
Symbol
Min
Typ
-15
Zero offset1
Max
Units
Notes/Conditions
15
mV/V
mV Output only
300
500
700
mV
0.5-4.5V Output only
16
20
24
mV/V
mV Output only
3800
4000
4200
mV
0.5-4.5V Output only
-1
1
%Span
BFSL
Hysteresis
-0.8
0.8
%Span
Zero repeatability
-0.8
0.8
%Span
Span repeatability
-0.8
0.8
%Span
Thermal shift for zero
-0.05
0.05
%Span/°C
Thermal shift for span
-0.05
0.05
Cycle life
1E+6
Full scale span1
Non-linearity
0 to full scale cycles
Deflection at rated load
0.03
Weight
(1)
Reference to 25°C, over
compensated
temperature
%Span/°C
6.0
mm
grams
Without ribbon cable
Max
Units
Notes/Conditions
0.5-4.5V Output only
Span and zero offset are ratiometric to power supply voltage
Environmental Specifications (Analog)
(Unless otherwise specified, all parameters are measured at 25°C @ 5.0V applied)
Parameter
Compensated temperature
range
Storage temperature
Symbol
Min
To
0
50
°C
Ts
-40
85
°C
0
85
%RH
Ambient humidity
IEC61000-4-2 (8kVair/4kVcontact)
IEC61000-4-3 (3V/m)
EN55032 Class A
EMI/RFI/ESD protection
Ingress protection
Media compatibility
TE CONNECTIVITY SENSORS /// FX29
Typ
IP
Non-condensing
mV Output only
43
External exposed surfaces: 17-4 and 304
stainless steel
DOC CONTROL NUMBER 05142019
Excluding cable &
connector
10/2020
Page 3
FX29
Compact Compression Load Cell
Schematic Diagram – mV output (Analog)
Block Diagram – 0.5 to 4.5V output (Analog)
Vdd
ANALOG
OUTPUT
TE CONNECTIVITY SENSORS /// FX29
DOC CONTROL NUMBER 05142019
10/2020
Page 4
FX29
Compact Compression Load Cell
Absolute Maximum Ratings (Digital) (1)
Parameter
Symbol
Min
Typ
Supply voltage
Storage temperature
TS
Compressive load
Lmax
ESD
(1)
-40
Max
Units
5.50
V
+85
°C
2.5X
Rated
4.0
kV
Human Body Model
Max
Units
Notes/Conditions
5.5
V
3
mA
5
µA
-4.0
Notes/Conditions
Maximum limits the device will withstand without damage
Standard Load Ranges
Pounds-Force (lbf)
10
Newtons (N)
50
25
125
50
250
100
500
200
1000
Electrical Specifications (Digital)
(Unless otherwise specified, all parameters are measured at 25°C @ 3.0V applied)
Parameter
Symbol
Min
Supply voltage (Vsupply)
Vdd
2.7
Operating current
Idd
Sleep mode current
Islp
Insulation resistance
TE CONNECTIVITY SENSORS /// FX29
Typ
0.5
50
DOC CONTROL NUMBER 05142019
MΩ
@250VDC
10/2020
Page 5
FX29
Compact Compression Load Cell
Force Operating Specifications (Digital)
(Unless otherwise specified, all parameters are measured at 25°C @ 3.0V applied)
Parameter
Symbol
Min
Typ
Max
Units
Notes/Conditions
300
1000
1700
Counts
Base10
14300
15000
15700
Counts
Base10
-1
1
%Span
BFSL
Hysteresis
-0.8
0.8
%Span
Zero repeatability
-0.8
0.8
%Span
Span repeatability
-0.8
0.8
%Span
Thermal shift for zero
-0.05
0.05
%Span/°C
Thermal shift for span
-0.05
0.05
Cycle life
1E+6
Zero offset
Full scale span
Non-linearity
A/D resolution
0 to full scale cycles
14
Bits
Response time
Deflection at rated load
Weight
Reference to 25°C, over
%Span/°C compensated temperature
3
mS
4MHz, non-sleep mode
8.4
mS
4MHz, sleep mode
0.03
mm
6.0
grams
Without ribbon cable
Max
Units
Notes/Conditions
Environmental Specifications (Digital)
(Unless otherwise specified, all parameters are measured at 25°C @ 3.0V applied)
Parameter
Compensated temperature
range
Storage temperature
Symbol
Min
To
0
50
°C
Ts
-40
85
°C
0
85
%RH
Ambient humidity
Ingress protection
Media compatibility
TE CONNECTIVITY SENSORS /// FX29
IP
Typ
Non-condensing
43
External exposed surfaces: 17-4 and 304
stainless steel
DOC CONTROL NUMBER 05142019
Excluding cable &
connector
10/2020
Page 6
FX29
Compact Compression Load Cell
Block Diagram – I2C Digital Output (Digital)
SDA
SCL
TE CONNECTIVITY SENSORS /// FX29
DOC CONTROL NUMBER 05142019
10/2020
Page 7
FX29
Compact Compression Load Cell
Force Output Graph (Digital)
� �
%Output
0%
5%
10%
50%
90%
95%
100%
=
4
� � ��
∗
�
+
Force Sensor Output
Counts (decimal)
Counts (hex)
1000
0x3E8
1700
0x6A4
2400
0x960
8000
0x1F40
13600
0x3520
14300
0x37DC
15000
0x3A98
I2C Typical Circuit
Note: only one pair of pull up resistors are needed for multiple sensing devices.
TE CONNECTIVITY SENSORS /// FX29
DOC CONTROL NUMBER 05142019
10/2020
Page 8
FX29
Compact Compression Load Cell
I2C Interface
Parameter
Symbol
Min
SCLK clock frequency
FSCL
100
Start condition hold time relative to
SCL edge
tHOSTA
0.1
µS
tLOW
0.6
µS
tHIGH
0.6
µS
Minimum SCL clock low width1
Minimum SCL clock high
width1
Typ
Max
Units
400
kHz
Start condition startup time relative to
SCL edge
Data hold time on SDA relative to SCL
edge
Data setup time on SDA relative to
SCL edge
tSUSTA
0.1
µS
tHDDAT
0
µS
tSUDAT
0.1
µS
Stop condition setup time on SCL
tSUSTO
0.1
µS
tBUS
2
µS
Bus free time between stop and start
condition
Notes/Conditions
I2C Interface Timing Diagram
Digital Input and Output Parameters
(Unless otherwise specified, all parameters are measured at 25°C @ 3.0V applied)
Symbol
Min
Max
Units
Input high voltage
Parameter
VIH
0.8
Typ
1.0
x Vdd
Input low voltage
VIL
0.0V
0.2
x Vdd
Output low level
x Vdd
Load capacitance @ SDA
200
pF
Input capacitance (each pin)
10
pF
TE CONNECTIVITY SENSORS /// FX29
Notes/Conditions
DOC CONTROL NUMBER 05142019
@400 kHz
10/2020
Page 9
FX29
Compact Compression Load Cell
I2C Measurement Packet Read Sequence
TE CONNECTIVITY SENSORS /// FX29
DOC CONTROL NUMBER 05142019
10/2020
Page 10
FX29
Compact Compression Load Cell
General Working Mode
TE CONNECTIVITY SENSORS /// FX29
DOC CONTROL NUMBER 05142019
10/2020
Page 11
FX29
Compact Compression Load Cell
Outline Drawing and Connections
TE CONNECTIVITY SENSORS /// FX29
DOC CONTROL NUMBER 05142019
10/2020
Page 12
FX29
Compact Compression Load Cell
Mounting Recommendation
The sensor can be put into a simple slot fixture for load testing. The load should be applied to the spherical face
of center boss. Recommended to stick the sensor with double face 3M adhesive or glue. Some feature to clamp
the sensor from top to down can be optional.
See below for reference:
NOTE: Clamping force may shift the zero reading slightly. Re-zero if needed.
Below table shown the Zero change difference when loaded 5 Lbf from the top. (For reference only)
Load Range
10L
25L
50L
100L
Changing for reference
±0.5%FS
±0.4%FS
±0.35%FS
±0.25%FS
Dimension for reference:
TE CONNECTIVITY SENSORS /// FX29
DOC CONTROL NUMBER 05142019
10/2020
Page 13
FX29
Compact Compression Load Cell
Ordering Information
Output Signal
Code
Output
2
20 mV/V*
3
0.5 – 4.5V*
J
I2C
(None Sleep)
K
I2C (Sleep)*
FX29 X X – XXX X – XXXX – X
Measurement Units
L
Pounds-force (lbf)*
N
Newtons
Output Type
mV
Amplified
Digital
Load Range
LBF
0010*
0025*
0050*
0100*
0200*
Digital
I2C Address
Code
Device Address (hex)
X
Analog Output*
0
0x28*
1
0x36
2
0x46
3
0x48
4
0x51
Cable Length
Code
Length
040
40 mm*
100
100 mm*
XXX
Custom Length
(MACHINING)
Newtons
0050
0125
0250
0500
1000
Cable & Connector
Code
Cable and Connector
A
4-wire ribbon cable without connector
B
4-wire ribbon cable with connector*
Note: For digital output, ensure custom cable
length does not exceed 1 meter.
*Sensor features shown in bold are typically stocked by our distribution partners, or available with short lead times from the
factory depending on availability. Contact customer service for details.
Caution:
For the digital sensor. User can change the address along with the guide as below link.
Please notice, any data changed by users means users give up the quality assurance terms. TE will not guarantee the
sensor performance any more.
https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Specification+Or+Standard%7FDIGITAL_MODEL
S_CHANGING_I2C_SLAVE_ADDRES%7FA1%7Fpdf%7FEnglish%7FENG_SS_DIGITAL_MODELS_CHANGING_I2C_SLAVE_ADDRES_A1
.pdf%7FCAT-PTT0015
TE CONNECTIVITY SENSORS /// FX29
DOC CONTROL NUMBER 05142019
10/2020
Page 14
FX29
Compact Compression Load Cell
REVISION HISTORY
Revision Number
Change Description
Date
Approval
A3
Minor corrections ;
06/24/2019
MH
A4
Correct pin numerical to be same as connector
07/29/2020
MH
A5
Mounting Recommendation and Caution added;
10/27/2020
MH
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Tel +1 800 522 6752
EUROPE
Tel +31 73 624 6999
ASIA
Tel +86 0400 820 6015
te.com/sensors
Microfused, Measurement Specialties (MEAS), TE Connectivity, TE, TE Connectivity (logo) and Every Connection Counts are trademarks. All other logos, products
and/or company names referred to herein might be trademarks of their respective owners
The information given herein, including drawings, illustrations and schematics which are intended for illustration purposes only, is believed to be reliable. However, TE
Connectivity makes no warranties as to its accuracy or completeness and disclaims any liability in connection with its use. TE Connectivity‘s obligations shall only be as
set forth in TE Connectivity‘s Standard Terms and Conditions of Sale for this product and in no case will TE Connectivity be liable for any incidental, indirect or
consequential damages arising out of the sale, resale, use or misuse of the product. Users of TE Connectivity products should make their own evaluation to determine
the suitability of each such product for the specific application.
© 2020 TE Connectivity Corporation. All Rights Reserved.
TE CONNECTIVITY SENSORS /// FX29
DOC CONTROL NUMBER 05142019
10/2020
Page 15
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