sensor. CCS803 Datasheet

CCS803 Datasheet PDF

Part CCS803
Description Ultra-low power gas sensor
Feature CCS803; CC-000017-DS revision: 11 Datasheet for CCS803 CCS803 Ultra-low power gas sensor for Ethanol detect.
Manufacture CMOS Sensors
Datasheet
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CCS803
CC-000017-DS revision: 11
Datasheet for CCS803
CCS803 Ultra-low power gas sensor for Ethanol detection
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.
Software libraries containing proprietary algorithms and example
Android application are available for alcohol breathalyser use
case.
Key Benefits
Ultra-low power
consumption - ideal for
battery operated devices
High sensitivity to Ethanol
Fast heating time <25ms
for quick response
Compact 2mm x 3mm
DFN package for small
form factor designs
Product Overview
The CCS803 is an ultra-low power MOX gas sensor for monitoring
Ethanol.
For CCS803 a supply voltage (VH) is provided to the integrated
micro-heater 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
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 an output voltage (VOUT) read
by an Analogue-to-Digital Converter (ADC). The reference voltage
(VREF) must only be enabled during the sensor reading.
CCS803 is supported in a compact 2 mm x 3 mm DFN (Dual Flat
No lead) package as standard.
Recommended Sensor
Configuration
Applications
Detection of Ethanol
Alcohol breathalyser in
consumer devices
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



CCS803
CC-000017-DS revision: 11
Datasheet for CCS803
Electrical characteristics
Parameters
Maximum target heater voltage (VH) 1
Recommended ambient operating
temperature
Recommended ambient operating
humidity
Storage temperature range
Recommended heater voltage (VH)
Average power consumption (PAV) 1.2
Heater resistance (RH)
Load resistance (RL)
Sensor resistance in clean air (Ra)
Conditions
Non-Condensing
VH = 1.6V
VH = 1.6V @ 50% RH
Min Typ Max
1.8
-5 50
15 95
-40 125
1.4 1.6
10.2
50 58
1
66
0.1 1.0
10
Units
V
oC
%RH
oC
V
mW
kΩ
kΩ
Notes:
1. When VH is produced by PWM of a VDD voltage above 1.8V the duty cycle (%) must not exceed 1.8V2 /
VDD2
2. Based on 30s heater on time which includes a 20s warm-up period and a 10s measurement window
performed once in a 2min period for Alcohol breath analysis. Refer to application note CC-000614-AN
for more details.
Sensor Performance
Gas type
Ethanol (C2H5OH)
Test condition
Ra / R100ppm
Typical Sensitivity Range 1,2
5 10
Notes:
1. 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.
2. 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



CCS803
CC-000017-DS revision: 11
Datasheet for CCS803
Recommended Application Circuit
The recommended application circuit for CCS803 is shown below.
VDD VREF
10KΩ
10KΩ
PWM
NX2301
VREF_Enable
NX2301
Pin2: Heater+
CCS803
Ethanol
Sensor
Pin1: Sensor+
Pins: 3 & 4
GND
RL = 1KΩ
Optional depends
on ADC input
impedance
VDD
+
ADC Input
-
MCU
(With integrated ADC)
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 CCS803, other duty cycles can be
calculated using the equation VH2 / VDD2 :
Target Heater
Voltage (VH)
1.40
1.50
1.60
1.5V
87%
100%
-
Supply Voltage (V)
1.8V 2.5V
3V
60% 31% 22%
69% 36% 25%
79% 50% 28%
3.3V
18%
21%
24%
Page | 3
© 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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