ams CCS801B-COPR Cambridge cmos sensors (ccs) micro-hotplate technology provide Datasheet

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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
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