Technical Description SEK-SCD41-Sensor
Evaluation Kit for SCD4x Miniaturized CO2 Sensor

 Development board with SCD41 CO2 sensor
 Plug and play sensor evaluation
 Includes jumper cable for simple prototyping Compact design: 28 mm x 24 mm x 8 mm
 Mounting holes for easy integration
 Large supply voltage range: 2.4 V – 5.5 V

Product Summary
The evaluation kit for the SCD4x CO2 enables easy sensor
evaluation and facilitated prototyping.
Electrical interfacing can be realized either via the throughhole pads or alternatively via the included jumper cable thatconnects to the integrated JST connector. The compact
design, the large supply voltage range and the mounting
holes allow versatile prototyping.
This technical description is limited to the SEK-SCD41
evaluation kit. For more information on the SCD4x
specifications and the interfacing consult the SCD4x
datasheet: www.sensirion.com/file/datasheet_scd4x

The SCD4x is Sensirion’s next generation miniature CO2sensor. This sensor builds on the photoacoustic sensing
principle and Sensirion’s patented PASens® andCMOSens® technology to offer high accuracy at an
unmatched price and smallest form factor. SMD assembly
allows cost- and space-effective integration of the sensor
combined with maximal freedom of design.
Note that the white dust and water protection membrane
on top of the sensor cap must not be removed at any time.

Table of Contents
12

Mechanical Specification ......................................................................................................................... 2
Hardware Interface Specification ............................................................................................................ 2
2.1
JST interface connector ...................................................................................................................... 2
2.2
Included cable sets ............................................................................................................................. 3
3 Revision History ....................................................................................................................................... 3

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Mechanical Specification

Figure 1: Mechanical dimension of the SCD40 development board. (a), (b): top view, (c) side view. All numbers are in mm.

2Hardware Interface Specification

2.1 JST interface connector
Pin1234Name
SCLGND
VDD
SDA

Comment
I2C serial clock input
Ground (negative supply)Power supply (positive supply)
I2C serial data input / output

JST PH, 2.0 mm pitch (S4B-PH-SM4-TB)
Table 1: Connector specification and pin assignment.

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2.2 Typical Application Circuit
A typical I2C application circuit is shown in Figure 2. Both SCL and SDA lines are open drain I/Os. They must
be connected to external pull-up resistors (e.g., Rp = 10 kΩ). It should be noted that pull-up resistors may beincluded in I/O circuits of microcontrollers or embedded platforms.

Figure 2: Typical application circuit to connect to the SCD41
Development Board via the connector or the through hole pads

2.3 Included cable sets
The SCD4x Evaluation Kit includes two cable sets. The ‘Adapter cable for SEK-SCD41’ allows to connect to acomputer via the ‘Sensirion Sensor Bridge’ that must be bought separately. The Jumper wire cable set for
SEK-SCD41 allows for easy electrical interfacing without soldering. The included pin headers enable tochange the gender of the jumper wire.
Pin1234ColorYellow
Black
Red
Green

Name
SCL
GND
VDD
SDA

Comment
I2C serial clock input
Ground (negative supply)Power supply (positive supply)
I2C serial data input / output

Adapter cable for SEK-SCD41

Jumper wire cable set for SEK-SCD41

Table 2: Pin assignment of the included cable sets.

3

Revision History

DateJanuary 2021

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Version1Page(s)AllChanges
Initial version

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Important Notices
Warning, Personal Injury
Do not use this product as safety or emergency stop
devices or in any other application where failure of theproduct could result in personal injury. Do not use thisproduct for applications other than its intended andauthorized use. Before installing, handling, using orservicing this product, please consult the data sheet andapplication notes. Failure to comply with these instructions
could result in death or serious injury.
If the Buyer shall purchase or use SENSIRION products for any
unintended or unauthorized application, Buyer shall defend,
indemnify and hold harmless SENSIRION and its officers,
employees, subsidiaries, affiliates and distributors against allclaims, costs, damages and expenses, and reasonable attorneyfees arising out of, directly or indirectly, any claim of personal
injury or death associated with such unintended or unauthorizeduse, even if SENSIRION shall be allegedly negligent withrespect to the design or the manufacture of the product.

ESD Precautions

The inherent design of this component causes it to be sensitive
to electrostatic discharge (ESD). To prevent ESD-induced
damage and/or degradation, take customary and statutory ESD
precautions when handling this product.
See application note “ESD, Latchup and EMC” for more
information.

Warranty

SENSIRION warrants solely to the original purchaser of thisproduct for a period of 12 months (one year) from the date ofdelivery that this product shall be of the quality, material andworkmanship defined in SENSIRION’s published specificationsof the product. Within such period, if proven to be defective,
SENSIRION shall repair and/or replace this product, inSENSIRION’s discretion, free of charge to the Buyer, provided
that:notice in writing describing the defects shall be given toSENSIRION within fourteen (14) days after theirappearance;such defects shall be found, to SENSIRION’s reasonablesatisfaction, to have arisen from SENSIRION’s faulty
design, material, or workmanship;the defective product shall be returned to SENSIRION’sfactory at the Buyer’s expense; and
the warranty period for any repaired or replaced productshall be limited to the unexpired portion of the originalperiod.
This warranty does not apply to any equipment which has notbeen installed and used within the specifications recommendedby SENSIRION for the intended and proper use of theequipment. EXCEPT FOR THE WARRANTIES EXPRESSLYSET FORTH HEREIN, SENSIRION MAKES NO
WARRANTIES, EITHER EXPRESS OR IMPLIED, WITHRESPECT TO THE PRODUCT. ANY AND ALL WARRANTIES,INCLUDING WITHOUT LIMITATION, WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULARPURPOSE, ARE EXPRESSLY EXCLUDED AND DECLINED.
SENSIRION is only liable for defects of this product arisingunder the conditions of operation provided for in the data sheet
and proper use of the goods. SENSIRION explicitly disclaims all
warranties, express or implied, for any period during which thegoods are operated or stored not in accordance with thetechnical specifications.
SENSIRION does not assume any liability arising out of any
application or use of any product or circuit and specificallydisclaims any and all liability, including without limitationconsequential or incidental damages. All operating parameters,
including without limitation recommended parameters, must bevalidated for each customer’s applications by customer’s
technical experts. Recommended parameters can and do varyin different applications.
SENSIRION reserves the right, without further notice, (i) tochange the product specifications and/or the information in thisdocument and (ii) to improve reliability, functions and design ofthis product.
Copyright © 2021, by SENSIRION.
CMOSens® is a trademark of Sensirion
All rights reserved

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Sensirion Inc. USA
phone: +1 312 690 5858
info-us@sensirion.com
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info-kr@sensirion.com
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phone: +41 44 306 40 00
fax:+41 44 306 40 30
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phone: +81 3 3444 4940
info-jp@sensirion.com
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Sensirion China Co. Ltd.
phone: +86 755 8252 1501
info-cn@sensirion.com
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phone: +41 44 306 40 00
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To find your local representative, please visit www.sensirion.com/contact

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