ams Datasheet Page 1
[v1-00] 2016-Dec-23 Document Feedback
CCS803
Ultra-Low Power Gas Sensor for
Ethanol Detection
ams 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 an
example Android app for Alcohol breathalyser use case are
available.
Product Overview
The CCS803 is an ultra-low power MOX gas sensor for Ethanol
detection.
For CCS803 a supply voltage (V
H
) is provided to the integrated
micro-heater and the gas concentration can be correlated to
the change in resistance of the MOX sensing layer (R
S
).
V
H
can be set using a low-dropout (LDO) regulator or operated
in pulsed PWM mode to reduce power consumption. The sensor
resistance (R
S
) is typically determined using a series load
resistor (R
L
), a reference voltage (V
REF
), and an output voltage
(V
OUT
) read by an Analogue-to-Digital Converter (ADC). The
reference voltage (V
REF
) must only be enabled during the
sensor reading.
CCS803 is supported in a compact 2mm x 3mm x 1mm DFN
(Dual Flat No lead) package as standard.
Ordering Information and Content Guide appear at end of
datasheet.
