Cambridge CMOS Sensors is now Member of the ams Group The technical content of this Cambridge CMOS Sensors (CCS) document is still valid. Contact information: Headquarters: ams AG Tobelbader Strasse 30 8141 Premstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: [email protected] Please visit our website at www.ams.com CC-000015-DS revision: 11 Datasheet for CCS801 CCS801 Ultra-low power multi-gas sensor for indoor air quality Cambridge CMOS Sensors (CCS) micro-hotplate technology provides a unique silicon platform for the CCS80x range of Metal Oxide (MOX) gas sensors. These devices enable sensor miniaturisation, have ultra-low power consumption and provide fast response times due to the ability to heat the micro-hotplate very quickly. The micro-hotplates are fabricated using a robust silicon dioxide membrane and include an embedded tungsten heating element to heat the MOX based sensing material. The MOX sensing material can be heated up to 500°C to allow the electrical resistance of the MOX sensor to be monitored to detect the target gas. By exploiting the fast heater cycling times, temperature modulation techniques can be used to reduce the device power consumption and implement advanced gas sensing methods. Key Benefits Ultra-low power consumption - ideal for battery operated devices High sensitivity Fast heating time <15ms for quick response Compact 2mm x 3mm DFN package for small form factor designs VREF Software libraries containing proprietary algorithms and example Android applications are available for indoor air quality monitoring and alcohol breathalyser use cases. RL = 200KΩ VOUT Gas Product Overview 1 3 RS CCS801 is an ultra-low power MOX multi-gas sensor for monitoring indoor air quality including Carbon Monoxide (CO) and a wide range of Volatile Organic Compounds (VOCs) such as Ethanol. CCS801 can be used as an equivalent carbon dioxide (eCO2) sensor to represent eCO2 levels in real world environments, where the main source of VOCs is from humans. 2 RH GND 4 VH = 1.4 - 1.6V GND Recommended Sensor Configuration For CCS801 a supply voltage (VH) is provided to the integrated microheater and the gas concentration can be correlated to the change in resistance of the MOX sensing layer (RS). VH can be set using a low-dropout (LDO) regulator or operated in constant or pulsed PWM mode to reduce power consumption. The sensor resistance (RS) is typically determined using a series load resistor (RL), a reference voltage (VREF), and by reading an output voltage (VOUT) with an Analogue-to-Digital Converter (ADC). The reference voltage (VREF) must only be enabled during the sensor reading. Applications Total VOC sensor for Indoor air quality monitoring CCS801 is supported in a compact 2 mm x 3 mm DFN (Dual Flat No lead) package as standard. Page | 1 © Cambridge CMOS Sensors Ltd, Deanland House, Cowley Road, Cambridge, CB4 0DL, UK Website: www.ccmoss.com Telephone: +44 1223 395 551 Date Issued: 26 May 2016 CC-000015-DS revision: 11 Datasheet for CCS801 Electrical characteristics Parameters Conditions Min Typ 1 Maximum heater voltage (VH) Recommended ambient operating temperature Recommended ambient operating humidity Storage temperature range Non-Condensing V -5 50 o 15 85 -40 125 2 Heater resistance (RH) Sensor resistance in clean air (Ra) Pulsed heating mode Constant power mode VH = 1.4V VH = 1.4V @ 50% RH VH = 1.4V @ 50% RH Lifetime VH = 1.4V Peak power consumption (PDC) Units 1.8 Recommended heater voltage (VH) Average power consumption (PAV) Max 50 0.2 C %RH o C 1.4 V 0.9 mW 33 mW 58 66 1.4 Ω MΩ >5 years Notes: 1. 2. 2 2 When VH is produced by PWM of a VDD above 1.8V the duty cycle (%) must not exceed 1.8V / VDD Based on a sensor measurement duty cycle of 2.5%, heater ON for 1.5secs (0.5s @ 1.6V, 1s @ 1.4V) and then heater OFF for 58.5s (0V). Sensor Performance Sensitivity is defined as the sensor’s resistance in air (Ra) divided by the sensor’s resistance at a specific gas concentration level at 50% relative humidity and 25°C ambient temperature (Rg). The following chart shows the sensitivity of CCS801 to CO, Ethanol and Toluene (as an example VOC gas) in constant power mode with a heater voltage (VH) of 1.4V. Operating a new sensor in constant power mode at VH in the first 24 hours is recommended to ensure sensor performance is stabilised. Page | 2 © Cambridge CMOS Sensors Ltd, Deanland House, Cowley Road, Cambridge, CB4 0DL, UK Website: www.ccmoss.com Telephone: +44 1223 395 551 Date Issued: 26 May 2016 CC-000015-DS revision: 11 Datasheet for CCS801 Recommended Application Circuit The recommended application circuit for CCS801 is shown below. VDD VREF 10KΩ 10KΩ NX2301 PWM VREF_Enable Optional depends on ADC input impedance NX2301 RL = 200KΩ Pin2: Heater+ CCS801 IAQ Sensor VDD Pin1: Sensor+ + ADC Input Pins: 3 & 4 MCU (With integrated ADC) GND PWM VREF_Enable Notes: 1. The sensor can be operated in pulsed mode to reduce overall power consumption. In this case the Heater VH is only driven for a fraction of the time at regular intervals under the control of the MCU. 2. An equivalent VH can be produced more efficiently with a PWM than with a linear regulator if a PWM output from the MCU is available to drive an external MOSFET switch (p-channel). If not driven the MOSFET input should be pulled high. 3. The PWM must operate with a minimum frequency of 10 kHz. The following table illustrates PWM duty cycle requirements to enable VH in the range 1.4 – 1.6V for CCS801, other duty cycles can be 2 2 calculated using the equation VH / VDD : Page | 3 Supply Voltage (VDD) Target Heater Voltage (VH) 1.5V 1.8V 2.5V 3V 3.3V 1.40 87% 60% 31% 22% 18% 1.50 100% 69% 36% 25% 21% 1.60 - 79% 50% 28% 24% © Cambridge CMOS Sensors Ltd, Deanland House, Cowley Road, Cambridge, CB4 0DL, UK Website: www.ccmoss.com Telephone: +44 1223 395 551 Date Issued: 26 May 2016 CC-000015-DS revision: 11 Datasheet for CCS801 4. An ADC input is required on the MCU to measure the sensor resistance, the recommended ADC reference voltage (VREF) depends on what voltage range the ADC supports. Control of the sensor bias (VREF) [e.g. by using an external MOSFET switch (p-channel)] is required to power the sensor bias only when needed for the ADC measurements, ensuring that all reference voltages are stable for the measurement. 5. A minimum load resistor (RL) value of 200kΩ is recommended. Pin Assignment Pin No Name Description 1 2 3 Sensor+ Heater+ Sensor- Sensor output (VOUT) Heater Input (VH) Connect to Ground or 0V 4 Heater- Connect to Ground or 0V Page | 4 © Cambridge CMOS Sensors Ltd, Deanland House, Cowley Road, Cambridge, CB4 0DL, UK Website: www.ccmoss.com Telephone: +44 1223 395 551 Date Issued: 26 May 2016 CC-000015-DS revision: 11 Datasheet for CCS801 DFN package outline ALL DIMENSIONS ARE IN MM DESCRIPTION SYMBOL MIN NOM MAX TOTAL THICKNESS A 0.95 1.0 1.05 STAND OFF A1 0 0.035 0.05 LEAD WIDTH b 0.7 0.75 0.8 BODY SIZE LEAD PITCH EP SIZE LEAD LENGTH D 3 BSC E 2 BSC e 1.0 BSC J 1.06 1.16 K 1.3 1.4 1.26 1.5 L 0.25 0.3 0.35 L1 0.35 0.4 0.45 The recommended package footprint or landing pattern for CCS801 is shown below: Note: 0.45 Pin 1 Corner 1 4 0.85 2 3 0.85 1. 2. 3. 4. All dimensions are in mm PCB land pattern in Green dash lines Pin numbers are in Red Add 0.05mm all around the nominal lead width and length for the PCB land pattern 1.5 0.45 1.30 Top View Page | 5 © Cambridge CMOS Sensors Ltd, Deanland House, Cowley Road, Cambridge, CB4 0DL, UK Website: www.ccmoss.com Telephone: +44 1223 395 551 Date Issued: 26 May 2016 CC-000015-DS revision: 11 Datasheet for CCS801 Ordering Information Part Number Description Package MOQ CCS801B-COPR CCS801B Multi-gas sensor for indoor air quality monitoring 2x3mm DFN 5000 CCS801B-COPS Samples of CCS801B Multi-gas sensor for indoor air quality monitoring 2x3mm DFN 100 Notes: 1. 2. 3. Refer to JEDEC J-STD020 lead-free standard for typical soldering reflow profile Refer to application note CC-000090-AN on device assembly guidelines Refer to application note CC-000018-AN on CCS80x hardware design guidelines. The contents of this document are subject to change without notice. While every care has been taken to ensure the accuracy of the contents of this document, CCS cannot accept responsibility for any errors. CCS products are not designed, authorized or warranted for use in medical, military, aircraft, space or life support equipment, nor in applications where failure or malfunction of a CCS product can reasonably be expected to result in personal injury, death or severe property or environmental damage. CCS accepts no liability for inclusion and/or use of CCS products in such equipment or applications and therefore such inclusion and/or use, is at the customer’s own risk. As any devices operated at high temperature have inherently a certain rate of failure, it is therefore necessary to protect against injury, damage or loss from such failures by incorporating appropriate safety measures. CCS products are not designed to work in condensing high humidity environments Page | 6 © Cambridge CMOS Sensors Ltd, Deanland House, Cowley Road, Cambridge, CB4 0DL, UK Website: www.ccmoss.com Telephone: +44 1223 395 551 Date Issued: 26 May 2016