SPECIFICATION. Product Name: Dust Sensor DS1705A. Product Data Sheet. Review Check Approve. Technology Quality Supplier

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1 UNICHIPS DUST S ensors Product Data Sheet Doc. No. : DOC_EN01-DS1705A Page 1 of 12 SPECIFICATION Product Name: Dust Sensor DS1705A Technology Quality Supplier Review Check Approve

2 Doc. No. : DOC_EN01-DS1705A Page 2 of 12 Table of Contents 1. Description Feature Application Schematic Protocol Electrical Characteristic Connector Pin Configuration Electro - Optical Characteristics Dust Signal Pulse Note for application Test Standard for dust sensor calibration Reliability Packing specification Outline Dimension Document Revision History... 14

3 Doc. No. : DOC_EN01-DS1705A Page 3 of 12 DS1705A Dust sensor for air purifier 1. Description DS1705A is a dust sensor that detects the dust particle concentration in air by using optical sensing method. An infrared light emitting diode (IR LED) and a photo-sensor are optically arranged in this device. The photo-sensor detects the reflected IR LED light by dust particles in air. This dust sensor can detect the small particle like cigarette smoke and it can distinguish small particles like smoke from large house dust by pulse pattern of signal output. This sensor has the interface of PWM, UART. 2. Features Compact size, light weight about 58.5(W) x 46(D) x 18(T) mm, ~23g. UART output and PWM (pulse width modulation) output Heart beat to monitor dust sensor life time and wire connection Number display P.M 2.5 Constant air flow by heater resister in dust sensor. Lead free and ROHS Minimum particle size can be detected over 1 μm (House dust size: avg. 20 μm, yellow dust size: avg. 20 μm, cigarette dust size: avg. 1 μm )

4 Doc. No. : DOC_EN01-DS1705A Page 4 of Application Detection of dust in the air, Indoor Air quality monitoring. Air cleaner, Air purifier, Air conditioner. Display P.M2.5, P.M10 particles by optical particle countering method. Number Display of dust concentration 4. Schematic 5. Protocol(PWM mode) 5.1 PWM mode: normal mode. - P1(Pin4) : PWM output for small particle(average 1um) 20 second moving averaged pulse width by MICOM program to stabilize dust signal data Single Low Pulse Output value at one second interval. <Example> LPO(5%) = Single pulse out of 50mSec pulse width at 1000mS interval VCC DS1705A GND P1 P2 MICOM

5 Doc. No. : DOC_EN01-DS1705A Page 5 of Electrical Characteristic 6.1 Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage V cc -0.3 to V Operating temperature T opr -10 to 60 Storage temperature T stg -30 to Operating Supply Voltage and Signal Output (Ta=25 ) Parameter Symbol Rating Unit Supply voltage V cc DC 5 ± 5%, Ripple <50mV at 60HZ*3 V Current Consumption I cc < 100± 10% ma Signal output PWM UART P1,P2 Hi : > 4.5V, Lo : <0.7V, *1 Negative (PWM) Negative Logic Pulse output Low pulse Baud rate 9600 bps Data bit 8 Bits Parity bit No Bit Stop bit 1 Bit Warm up time 100 Sec 6.3 Recommend Operating Temperature/Humidity Parameter Rating Unit Operating Temp./Humidity 7. Connector -10 ~ 45, < 85%RH *1, %RH *1. Dust sensor can detect the micro size water droplet, like fog and mist, as particles. Please do not use the dust sensor in fog place, hot bath place or near humidifier. But the de-solved water droplet in the high humid air is under submicron size and the dust sensor cannot detect this submicron size water droplet. Standard connector(ds1705a) Connector Part No. Symbol Description Maker Connector SMAW250-05G Housing 25048HS mm pitch YeonHo Elec.(Korea) Terminal YST025 - SMAW250-05G is standard type connector.

6 Doc. No. : DOC_EN01-DS1705A Page 6 of Connector Pin Configuration Number Symbol Pin Description Pin 1 GND Ground, Connect with System ground Pin 2 P2 TXD Low pulse Signal output(p2) of large particle, active low PWM TBD Pin 3 Vcc Input Supply voltage (+5 V) Pin 4 P1 Low pulse Signal output(p1) of small particle, active low PWM Pin 5 NC RXD no connected, TBD - Please refer the drawing for pin number assignment. - For P1 and P2, Do not need to external pull up resister, internal pull up resistor is 10K. 9. Electro-Optical Characteristics

7 Doc. No. : DOC_EN01-DS1705A Page 7 of Dust Signal pulse 10.1 Single Low pulse width vs LPO(%) relationship Parameter Symbol Conditions Min Typ Max Unit Single Low pulse width of a small particle (P1) Single Low pulse width of a large particle(p2) Tsp Tlp *1 Cigarette smoke 1 LPO(%)/100*1000 msec *2 House dust 1 LPO(%)/100*1000 msec *1. Single low pulse width during 1000mS period is decided by LPO concentration. In not heavily contaminated condition, 100,000 particle/ft 3 of cigarette smoke, output pulse width of P1 pin is the average detection result of average one micrometer size of particles based on cigarette smoke during one second using eight second moving average. The pulse width is calculated as follows: - Typical LPO value of 100,000 particle/ft 3 is 2% from Fig.1 data sheet. - Output pulse width (msec) = 2/100*1000(mSec) = 20mSec at 1000mSec interval. *2. Low pulse width of a house dust is longer than cigarette smoke particle. P2 can be used to detect large particle like house dust and pollen.

8 Doc. No. : DOC_EN01-DS1705A Page 8 of Notes for application 11.1 EMI and Power line noise protection and malfunction To protect EMI affection of photo sensor signal from motor and high voltage source, another bottom metal shield case could be soldered on electronic PCB s ground by customer requirements. Normally, top shield case is enough to protect EMI from outer electronic goods. However, to prevent EMI from high voltage negative ion generator and power line noise from electric dust collector, please install the high voltage generator in the opposite side from dust sensor also pay attention to prevent power line noise by using noise filter. The malfunction of dust senor can be observed by taping all holes of dust sensor completely not to penetrate dust into open holes of dust senor. After making clean the dust sensor chamber and taping all holes not to come any dusts into optical zone of sensor and operate the sensor. In this experiment dust sensor has not to show any low pulse output. If it is interrupted by EMI and line noise, many Low pulse output signal will be showed up. In this case, please consult to UNICHIPS s technical team Dust Sensor install Method When customer install the dust sensor in air cleaner, dust sensor must be installed vertically in the place that is not affected by air flow caused by motor fan rotation. We recommend to install dust sensor in the front panel side. The dust sensor can detect the water vapor as dust. Please do not use dust sensor in vaporizing place like bathroom or at near air humidifier. Dust sensor use IR wavelength LED and the visible cutoff photo sensor, but the irradiation by lamp light of optical sensing zone will cause malfunction of dust sensor. Please protect the center hole shaped triangle for dust sensor optics not to irradiate directly. Please do not close the bottom and top hole for air flow to measure the dust. The center hole of PCB is for screwing bolt to system. Please use screw PH 3 pie for fixing. Please pay attention not to damage the sensor optics and cover case. The heater resister is installed inside of dust sensor for inducing the forced air convection and the heated air flows from bottom side to top side direction. The heater resister s temperature is increased over 40 than atmosphere. So, vertical positioning of dust sensor is important for air flow direction and speed optical zone. The air flow direction and flow speed can affect the signal output of dust sensor. Please keep ± 5 degree position vertically Cleaning Cigarette tar on the lens should affect the sensitivity of dust senor. Wet swab with alcohol and rub softly the lens and dry. Normally wet cleaning is not recommended, because there is a case this device is not satisfied with its characteristics by wet cleaning. If large particle such as home dust are accumulate in the dust sensor optics parts, please consider the maintenance such as vacuuming or blowing off the dust by air Sensitivity adjustment, customized low pulse output data control by MICOM programming Dust sensor sensitivity is adjusted by MICOM program. Customer cannot change the sensitivity by volume resister. MICOM send the low pulse output data proportional with dust concentration. Also MICOM can be programmed to send the communication code with system MICOM like code for LED level or code for monitoring sensor life. If customer wants to use dust sensor to special

9 Doc. No. : DOC_EN01-DS1705A Page 9 of 12 purpose like fire detection, MICOM program can be changed to send low pulse data for fire alarm level warning. Please contact to UNICHIPS technical team for more information Responsibility This product shall not contain the following materials banned in RoHS Directive. (2002/95/EC) - Pb, Hg, Cd, Cr+6, PBB, PBDE UNICHIPS takes no responsibility for any problems related to any intellectual property right of a third party resulting from the use of UNICHIPS s device. UNICHIPS takes no responsibility for damage caused by improper use of the device which does not meet the condition of absolute maximum ratings to be specified in relevant specification sheet nor meet the condition of the extremely high level of reliability and safety such as safety device, clean room monitoring, fire alarm, life support equipment, etc. This publication is the proprietary product of UNICHIPS and is copyright with all rights reserved. Under the copyright laws, no part of this publication may be reproduced or transmitted in any form of or by any means, for any purpose, without the express written permission of UNICHIPS. The express written permission is also needed before any use of this publication by a third party. Please contact with an UNICHIPS representative if there are any questions for this publication. 12. Test Standard for dust sensor calibration The first standard is the certificated particle counter. (Metone, HACC) The second standard is the master dust sensor and the master dust sensor is always used for the process quality control of production. This master dust sensor will be compared with the customer master sensor once every six month. All dust sensor is calibrated by MICOM auto calibration program of dust sensor.

10 Doc. No. : DOC_EN01-DS1705A Page 10 of Reliability 1 Drop 2 High temp. Storage 3 Low temp. storage Drop it unintentionally from 100cm height down to the hard wooden board three times at random direction Leave in the atmosphere 80 for 1,000 hours Leave in the atmosphere -30 for 1,000 hour Repeat 20 times in the following cycle. 4 Thermal Cycle Repeat 20 times in the following cycle. - No damage, - No breakage, - Output Within ±30% of the initial LPO of sample) N=10 5 Thermal Shock 6 High Temp. Operation Operating it in the atmosphere of 60 for 1000 hours 7 Low Temp. Operation Operating it in the atmosphere of -10 for 1000 hours 8 Mechanical shock Frequency : 5~55~5Hz Acceleration : 21.6m/s^2(2.2G) Direction : X,Y,Z direction for 2 hours N=2

11 Doc. No. : DOC_EN01-DS1705A Page 11 of Packaging Specification TBD 15. Outline Dimension

12 Doc. No. : DOC_EN01-DS1705A Page 12 of Document Revision History No. Section and description of revision: Date Author 0.1 Initial released