CCS811
Ultra-Low Power Digital Gas Sensor
for Monitoring Indoor Air Quality
CCS811 Datasheet
Revision:
2
Release Date:
December 2020
Document Status: Production
CCS811 has been transferred from ams AG to ScioSense
The datasheet is valid in its presented form
but might still have reference to ams AG
ScioSense is a Joint Venture of ams AG
Headquarters:
ScioSense B.V.
High Tech Campus 10
5656 AE Eindhoven
The Netherlands
Contact:
www.sciosense.com
info@sciosense.com
Sensing tomorrow’s world
CCS811
Ultra-Low Power Digital Gas Sensor for
Monitoring Indoor Air Quality
General Description
The CCS811 is an ultra-low power digital gas sensor solution
which integrates a metal oxide (MOX) gas sensor to detect a
wide range of Volatile Organic Compounds (VOCs) for indoor
air quality monitoring with a microcontroller unit (MCU), which
includes an Analog-to-Digital converter (ADC), and an I²C
interface.
CCS811 is based on Sciosense unique micro-hotplate
technology which enables a highly reliable solution for gas
sensors, very fast cycle times and a significant reduction in
average power consumption.
The integrated MCU manages the sensor driver modes and
measurements. The I²C digital interface significantly simplifies the
hardware and software design, enabling a faster time to market.
CCS811 supports intelligent algorithms to process raw sensor
measurements to output equivalent total VOC (eTVOC) and
equivalent CO2 (eCO2) values, where the main cause of VOCs is
from humans.
CCS811 supports multiple measurement modes that have been
optimized for low-power consumption during an active sensor
measurement and idle mode extending battery life in portable
applications.
CCS811 is available in a 10 lead 2.7mm x 4.0mm x 1.1mm, 0.6mm
pitch LGA package.
Ordering Information and Content Guide appear at end of
datasheet.
1 ams Datasheet
[v1-06] 2019-Feb-07
CCS811B Datasheet Revision 2 SC-001232-DS / 2020-12-17
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CCS811 − General Description
Key Benefits & Features
The benefits and features of CCS811, Ultra-Low Power Digital Gas
Sensor for Monitoring Indoor Air Quality are listed below:
Figure 1:
Added Value of Using CCS811 Sensor
Benefits
Features
• Manages the sensor drive modes and
measurements while detecting VOCs
• Integrated MCU
• Provides eCO2 level or eTVOC indication with no
host intervention
• On-board processing
• Simplifies the hardware and software integration
• Standard (100kbit/s) and fast (400kbit/s)
I²C interface
• Extend battery life in portable applications
• Optimised low-power modes
• Suitable for small form-factor designs
• 2.7mm x 4.0mm x 1.1mm LGA package
• Saves up to 60% in PCB footprint
• Low component count
• Designed for high volume and reliability
(>5years lifetime)
• Proven technology platform
Applications
This device can be mainly used for indoor air quality
monitoring in:
• Smart phones
• Air cleaners and purifiers
• Smart thermostats
• Home controllers
• Smart accessories and IoT devices
CCS811B
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CCS811 − General Description
Block Diagram
The functional blocks of this device are shown below:
VDD
SCL
SDA
ADDR
Figure 2:
CCS811 Block Diagram
MCU
3 ams Datasheet
[v1-06] 2019-Feb-07
Sense
MOX
H- Gas Sensor
PWM
GND
nWAKE
(With Integrated ADC)
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CCS811 − Pin Assignment
Pin Assignment
Figure 3:
Pin Diagram
Pin Diagram: The Exposed Pad is underneath
Figure 4:
CCS811 LGA Pin Assignment
Pin No.
Pin Name
Description
ADDR
Single address select bit to allow alternate address to be selected
• When ADDR is low the 7 bit I²C address is decimal 90 / hex 0x5A
• When ADDR is high the 7 bit I²C address is decimal 91 / hex 0x5B.
2
nRESET
nRESET is an active low input and is pulled up to VDD by default. nRESET is
optional but 4.7kΩ pull-up and/or decoupling of the nRESET pin may be
necessary to avoid erroneous noise-induced resets. This pin will be pulled low
internally during reset.
3
nINT
nINT is an active low optional output. It is pulled low by the CCS811 to indicate
end of measurement or a set threshold value has been triggered.
4
PWM
Heater driver PWM output. Pins 4 and 5 must be connected together.
5
Sense
Heater current sense. Pins 4 and 5 must be connected together.
6
VDD
7
nWAKE
8
NC
No connect
9
SDA
SDA pin is used for I²C data. Should be pulled up to VDD with a resistor.
10
SCL
SCL pin is used for I²C clock. Should be pulled up to VDD with a resistor.
EP
Exposed Pad
1
Supply voltage.
nWAKE is an active low input and should be asserted by the host prior to an I²C
transaction and held low throughout.
Connect to ground.
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CCS811 − Absolute Maximum Ratings
Absolute Maximum Ratings
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. These are stress
ratings only. Functional operation of the device at these or any
other conditions beyond those indicated under Electrical
Characteristics is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability
Figure 5:
Absolute Maximum Ratings
Symbol
Parameter
Min
Max
Units
Comments
3.6
V
Average Supply Current
30
mA
In mode 1
IDDPeak
Peak Supply Current
54
mA
In modes 2 and 3
P
Power Consumption
60
mW
In mode 1
Electrical Parameters
VDD (1)
IDD
1.8(2)
Supply Voltage
Electrostatic Discharge
ESDHBM
Human Body Model
±2000
V
ESDCDM
Charged Device Model
±1000
V
Environmental Conditions
TAMB(3)
Ambient Temperature for Operation
-40
85
oC
TSTRG
Storage Temperature
-40
125
oC
RHNC
Relative Humidity (non-condensing)
10
95
%
MSL
Moisture Sensitivity Level
1
Unlimited max.
floor life time
Note(s):
1. The supply voltage VDD is sampled during boot and should not vary during operation.
2. The minimum supply voltage VDD is 1.8V and should not drop below this value for reliable device operation.
3. Sensors are electrically operable in this range, however indoor air quality performance will vary in this range.
5 ams Datasheet
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CCS811 − Electrical Characteristics
Electrical Characteristics
Figure 6:
Electrical Characteristics
Parameters
Conditions
Min
Supply Voltage (VDD) (1), (2)
Supply Current (IDD) (3)
Typ (6)
1.8
Max
Units
3.3
V
During measuring at 1.8V
26
mA
Average over pulse cycle(3) at 1.8V
0.7
mA
Sleep Mode at 1.8V
19
μA
Idle Mode 0 at VDD= 1.8V
0.034
mW
Mode 1 & 4 at VDD= 1.8V
46
mW
Mode 2 at VDD= 1.8V
7
mW
Mode 3 at VDD= 1.8V
1.2
mW
Power Consumption
Logic High Input (nRESET,
nWAKE, ADDR, SCL and SDA)(5)
VDD 0.5
VDD
V
Logic Low Input (nRESET,
nWAKE, ADDR, SCL and SDA)(5)
0
0.6
V
VDD 0.7
VDD
V
0
0.6
V
Logic High Output (nINT)
Logic Low Output (nINT, SCL
and SDA)
Product Lifetime (LT)(6)
In Mode 1
>5
Years
Note(s):
1. The supply voltage VDD is sampled during boot and should not vary during operation.
2. The maximum V DD ramp time for Power On is 3ms.
3. Typical values for 1.8V supply voltage (V DD ).
4. Average Supply Current (IDD) for a sensor measurement once every 60 seconds.
5. For SDA and SCL timing refer NXP I²C – bus specification and user manual UM10204.
6. Typical values at 25 oC and 50% RH.
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CCS811 − Electrical Characteristics
Figure 7:
Timing Characteristics
Parameters
Conditions
tAPP_START
tWAKE (1)
Min
Typ
Max
Units
Time between giving the APP_START
command in boot mode and the device
being ready for new I²C commands
1
ms
Time after falling nWAKE and the device
being ready for new I2C commands
50
μs
Time between power on and the device
being ready for new I²C commands
18
20
ms
Time after rising nRESET pin or giving the
SW_RESET command and the device
being ready for new I²C commands
1
2
ms
tSTART (2)
tDWAKE
Minimum time nWAKE should be high
after rising nWAKE
20
μs
tDRESET
Minimum time nRESET should be high
after rising nRESET
20
μs
tRESET
Minimum time nRESET should be low
after falling nRESET
15
μs
fI²C
Frequency of I²C bus supported
10
100
400
kHz
tI²C
Clock stretch duration
0
1
100
ms
Note(s):
1. nWAKE should be asserted prior to and during any I²C transaction.
2. Up to 70ms on the first Reset after new application download.
7 ams Datasheet
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CCS811 − Electrical Characteristics
Figure 8:
CCS811 Timings
SCL/SDA
Min delay of 20ms
till start of I²C
APP_START
Min delay of 1ms
till start of I²C
Application Commands
VDD
SCL/SDA
nRESET
SCL/SDA
Min length of 15μs
for reset pulse
tWAKE
Min delay of 50μs
till start of I²C
nWAKE
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Commands
Min delay of 2ms
till start of I²C
Min high time of
20μs after reset
Commands
Commands
Min high time of
20μs after wake
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[v1-06] 2019-Feb-07
CCS811 − Detailed Description
Detailed Description
State Machine
The state machine for CCS811 is shown below:
Figure 9:
CCS811 State Machine
nRESET pulsed
Off
power on
power off
On Boot
APP_ERASE
APP_DATA
APP_VERIFY
SW_RESET
App
Idle
mode=0
Idle
Erasing
mode=1
Mode1s
Writing
mode=2
Mode10s
Verifying
mode=3
Mode60s
mode=4
Mode.25s
APP_START
When powering on the CCS811, a typical action is to transition
from Boot to App mode, a write to register APP_START with no
data is required. Before performing the write the STATUS register
should be accessed to check if there is an application present.
When in App mode, the next step is to start measuring.
For example, writing 1 to register MEAS_MODE selects
operation mode Mode1s: every second new measurement data
(CO2, TVOC) becomes available.
A write to register SW_RESET (with a four byte “cookie”) will restart
the CCS811 in Boot mode. The key feature of the Boot mode is
replacement of the application firmware. First erase the application
firmware (write to APP_ERASE), next write the new firmware image
(use multiple 8 byte writes via APP_DATA), and finally verify the
written firmware (with a write to APP_VERIFY).
For details on these registers, see later sections in this
datasheet.
9 ams Datasheet
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CCS811 − Detailed Description
Power States
The previous diagram showed that when the CCS811 is
powered On it can be in several functional states (e.g. App with
Mode1s). Orthogonal to this, when the CCS811 is On, it can be in
several power states. The diagram below illustrates the power
behavior.
on work
Figure 10:
CCS811 Power States
As long as the CCS811 has work to do, for example, handling
I2C transactions from the master, executing a measurement or
running algorithms to convert measurement to eCO2/eTVOC,
the CCS811 is Busy. When measurements are enabled a timer is
running (which expires every 1, 10, 60 or 0.25 seconds), but
running a timer does not count as work.
When there is no work to do, the power state transitions from
Busy to either Idle or Sleep, depending on the state of the nWAKE
pin. With nWAKE high, the master requests Sleep mode, with
nWAKE low, the CCS811 stays Wake but Idle.
In Idle mode, work can appear, either an I2C transaction from the
host, or the timer expires, triggering a measurement
(followed by an algorithm step).
In Sleep mode the CCS811 is not ready to handle I2C
transactions. The master should first pull nWAKE low, this
causes the CCS811 to transition to Wake (Idle). A timer could be
running, when it expires, it also causes the CCS811 to transition to
Wake, but as Busy.
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CCS811 − Detailed Description
Note that a hardware reset (via the nRESET) pin can be triggered
irrespective of the power state (assuming On), for a SW_RESET, the
CCS811 needs to be Wake.
So, tying nWAKE to ground is the simplest hardware
configuration – CCS811 will always be Wake and ready to
communicate but consumes more power. If power
consumption is a concern, the master should set nWAKE low
before I2C communication and high afterwards. If
measurements are enabled, the CCS811 will use a timer to wake up
itself periodically to execute a measurement.
Modes of Operation
The CCS811 has 5 modes of operation as follows
• Mode 0: Idle, low current mode
• Mode 1: Constant power mode, IAQ measurement every
second
• Mode 2: Pulse heating mode IAQ measurement every 10
seconds
• Mode 3: Low power pulse heating mode IAQ
measurement every 60 seconds
• Mode 4: Constant power mode, sensor measurement
every 250ms
In Modes 1, 2, 3, the equivalent CO2 concentration (ppm) and
eTVOC concentration (ppb) are calculated for every sample.
• Mode 1 reacts fastest to gas presence, but has a higher
operating current
• Mode 3 reacts more slowly to gas presence but has the
lowest average operating current.
When a sensor operating mode is changed to a new mode with a
lower sample rate (e.g. from Mode 1 to Mode 3), it should be
placed in Mode 0 (Idle) for at least 10 minutes before enabling
the new mode. When a sensor operating mode is changed to a
new mode with a higher sample rate (e.g. from Mode 3 to Mode
1), there is no requirement to wait before enabling the new
mode.
Mode 4 is intended for systems where an external host system
wants to run an algorithm with raw data and this mode provides
new sample data every 250ms. Mode 4 is also recommended
for end-of-line production test to save test time. For additional
information please refer to application note ScioSense
AN000373: CCS811 Factory test procedure.
Note(s): Mode timings are subject to typical 2% tolerance due to
accuracy of internal clock
11 ams Datasheet
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CCS811 − Detailed Description
Early-Life (Burn-In)
CCS811 performance in terms of resistance levels and
sensitivities will change during early life. The change in
resistance is greatest over the first 48 hours of operation.
CCS811 controls the burn-in period allowing eCO2 and eTVOC
readings to be used from first power-on after 60 minutes of
operation in modes 1-3.
Conditioning Period (Run-In)
After early-life (Burn-In) the conditioning or run-in period is the
time required to achieve good sensor stability before
measuring VOCs after long idle period.
After writing to MEAS_MODE to configure the sensor in mode 1-4,
run CCS811 for 20 minutes, before accurate readings are
generated.
The conditioning period must also be observed before writing
to the BASELINE register.
eCO2
The equivalent CO2 (eCO2) output range for CCS811 is from
400ppm up to 32768ppm.
eTVOC
The equivalent Total Volatile Organic Compound (eTVOC)
output range for CCS811 is from 0ppb up to 29206ppb.
Temperature and Humidity Compensation
If an external sensor is available this information can be written
to CCS811 so that they will be used to compensate gas readings
due to temperature and humidity changes. When ENV_DATA
has been written, the next eCO2 and eTVOC readings (in
ALG_RESULT_DATA) may not yet use the latest ENV_DATA. All
subsequent reading will use the ALG_RESULT_DATA. Refer to the
ENV_DATA (Environment Data) Register (0x05).
Interrupt and Interrupt on Threshold
At the end of each measurement cycle (250ms, 1s, 10s, 60s) a flag
is set and optionally interrupt (nINT) pin asserted. Refer to the
MEAS_MODE (Measurement and Conditions) Register
(0x01). The user can choose to only assert nINT if the eCO2 value
changes into a different range set by register values. Refer to the
THRESHOLDS Register (0x10).
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CCS811 − Detailed Description
Automatic Baseline Correction
The resistance RS of the sensitive layer is the output of the
sensor. However, metal oxide sensors do not give absolute
readings. The resistance RS varies from sensor to sensor
(manufacturing variation), from use-case to use-case, and over
time. To mitigate this problem, the output of the sensor is
normalized: RS is divided by RA. The value of RA is known as the
baseline. RA cannot be determined by a one-time calibration; it is
maintained on-the-fly in software. This process is known as
baseline correction. The air quality is expected to vary in a typical
environment so the minimum time over which a
baseline correction is applied is 24 hours. Automatic baseline
correction is enabled after initial device operation.
Manual Baseline Correction
There is a mechanism within CCS811 to manually save and restore
a previously saved baseline value using the BASELINE register.
For additional information on manual baseline control please refer
to application note ScioSense AN000370: CCS811 Clean Air
Baseline Save and Restore.
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CCS811 − Application Information
Application Information
The recommended application circuit for CCS811 is shown
below.
Figure 11:
Recommended Application Circuit
VDD
Host
Processor
VDD
CCS811
Digital VOC sensor
SCL
SCL
SDA
SDA
4.7μF
GPIOx
nWAKE
Reset
nReset
Interrupt
PWM
nINT
ADDR
Sense
GND
Note(s):
1. The PWM (Pin 4) and Sense (Pin 5) signals on CCS811 must be connected together.
2. A decoupling capacitor must be placed close to the supply pin VDD on the CCS811.
3. The value of the pull-ups for SCL and SDA depends on the host system configuration (desired bus speed, bus length, number of
slaves, etc.).
4. If power is not an issue, nWake can be connected to ground if a spare GPIO is not available on the host processor.
5. ADDR must be connected to either VDD (logic 1) or ground (logic 0) depending on the required lsb of the CCS811’s I²C slave address.
Host System Software Requirements
1. The minimum level of driver support that a host system
needs is read and write I²C transactions of data bytes
where the nWAKE pin is asserted at least tAWAKE before
the transaction and kept asserted throughout.
2. An Interrupt handler is also recommended to tell the
application code that the device has asserted an
interrupt.
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CCS811 − Application Information
I²C Interface
I²C transactions require a register address to be selected
(written) and followed by data, as described by the transaction
types in the subsections below. Each Register location
corresponds to a byte or multiple bytes. Multiple reads or writes in
a single sequence will be to or from the same location (the address
does not increment). Therefore, registers are
sometimes referred to as mailboxes in this document.
CCS811 requires the host processor supports clock stretching.
I²C Register Write
Figure 12:
I²C Register Write
S
SLAVE ADDRESS
W A
DATA(REG ADDR)
A P
S
SLAVE ADDRESS
W A
DATA(REG ADDR)
A
DATA
A
S
SLAVE ADDRESS
W A
DATA(REG ADDR)
A
DATA
A
From master to slave
S
Start condition
W
Write
From slave to master
P
STOP condition
R
Read
A
P
DATA
A P
Acknowledge
As shown above, a transaction may be:
• Single Byte to select a register address for subsequent
read
• Two Bytes to select a register address and write a byte to
it, typically to set a single-byte register value
• Multi-Bytes to select a register address and write several
bytes to it, typically to set multiple configuration bytes
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CCS811 − Application Information
I²C Register Read
Figure 13:
I²C Register Read
S
SLAVE ADDRESS
W A
DATA(REG ADDR)
A P
S
SLAVE ADDRESS
R A
DATA
N P
S
SLAVE ADDRESS
W A
DATA(REG ADDR)
A S
S
SLAVE ADDRESS
W A
DATA(REG ADDR)
A P
S
SLAVE ADDRESS
R A
DATA
A
DATA
N P
S
SLAVE ADDRESS
R A
DATA
A
DATA
N P
S
SLAVE ADDRESS
R A
DATA
A
DATA
N P
SLAVE ADDRESS
R A
From master to slave
S
Start condition
W
Write
A
Acknowledge
From slave to master
P
STOP condition
R
Read
N
Not acknowledge
DATA
N P
• Since no register address can be supplied during an I²C
read, an I²C write needs to be prepended to select the
required register first.
• The write and read operations can optionally be combined
into a single transaction using a repeated start condition,
as shown in the second example above.
• Select and repeatedly read multiple data values from
register, if the three reads are from the same register
(mailbox), or from three subsequent registers (mailboxes).
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CCS811 − Application Register Overview
Application Register Overview
All I²C transactions must use the (7 bits) slave address 0x5A or
0x5B depending on status of ADDR pin when writing to and
reading from the CCS811. Figure 14 shows the register map for
CCS811. Figure 25 shows the bootloader register map.
Figure 14:
CCS811 Application Register Map
Address
Register
0x00
STATUS
0x01
MEAS_MODE
R/W
Size
Description
R
1 byte
Status register
R/W
1 byte
Measurement mode and conditions register
Algorithm result. The most significant 2 bytes contain a
ppm estimate of the equivalent CO2 (eCO2) level, and
the next two bytes contain a ppb estimate of the total
VOC level.
0x02
ALG_RESULT_DATA
R
up to
8 bytes
0x03
RAW_DATA
R
2 bytes
Raw ADC data values for resistance and current source
used.
0x05
ENV_DATA
W
4 bytes
Temperature and humidity data can be written to
enable compensation
0x10
THRESHOLDS
W
4 bytes
Thresholds for operation when interrupts are only
generated when eCO2 ppm crosses a threshold
0x11
BASELINE
R/W
2 bytes
The encoded current baseline value can be read. A
previously saved encoded baseline can be written.
0x20
HW_ID
R
1 byte
Hardware ID. The value is 0x81
0x21
HW Version
R
1 byte
Hardware Version. The value is 0x1X
0x23
FW_Boot_Version
R
2 bytes
Firmware Boot Version. The first 2 bytes contain the
firmware version number for the boot code.
0x24
FW_App_Version
R
2 bytes
Firmware Application Version. The first 2 bytes contain
the firmware version number for the application code
0xA0
Internal_State
R
1 byte
Internal Status register
0xE0
ERROR_ID
R
1 byte
Error ID. When the status register reports an error its
source is located in this register
0xFF
SW_RESET
W
4 bytes
If the correct 4 bytes (0x11 0xE5 0x72 0x8A) are written
to this register in a single sequence the device will reset
and return to BOOT mode.
Note(s):
1. The number of bytes read from a register must not exceed the size in this table.
2. For more information on CCS811 programming requirements please refer to ScioSense application note AN000369.
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CCS811 − Application Register Overview
STATUS Register (0x00)
Single byte read only register which indicates if a device is
active, if new data is available or if an error occurred.
Figure 15:
Status Register
7
6
5
4
3
FW_MODE
APP_ERASE
APP_VERIFY
APP_VALID
DATA_READY
Bit(s)
Field
7
FW_MODE
0: Firmware is in boot mode, this allows new firmware to be loaded
1: Firmware is in application mode. CCS811 is ready to take ADC measurements
APP_ERASE
Boot Mode only.
0: No erase completed
1: Application erase operation completed successfully (flag is cleared by APP_DATA
and also by APP_START, SW_RESET, nRESET and APP_VERIFY)
After issuing the ERASE command the application software must wait 500ms
before issuing any transactions to the CCS811 over the I 2C interface.
5
APP_VERIFY
Boot Mode only.
0: No verify completed
1: Application verify operation completed successfully (flag is cleared by
APP_START, SW_RESET and nRESET)
After issuing a VERIFY command the application software must wait 70ms before
issuing any transactions to CCS811 over the I²C interface
4
APP_VALID
0: No application firmware loaded
1: Valid application firmware loaded
3
DATA_READY
2:1
-
6
0
ERROR
1
-
0
ERROR
Description
0: No new data samples are ready
1: A new data sample is ready in ALG_RESULT_DATA, this bit is cleared when
ALG_RESULT_DATA is read on the I²C interface
Reserved
This bit is cleared by reading ERROR_ID (it is not sufficient to read the ERROR field of
ALG_RESULT_DATA and STATUS )
0: No error has occurred
1: There is an error on the I²C or sensor, the ERROR_ID register (0xE0) contains the
error source
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CCS811 − Application Register Overview
MEAS_MODE (Measurement and Conditions)
Register (0x01)
This is Single byte register, which is used to enable sensor drive
mode and interrupts.
Figure 16:
Measure Mode Register
7
6
-
4
DRIVE_MODE
Bit(s)
Field
7
-
6:4
5
DRIVE_MODE
3
2
INTERRUPT
THRESH
1
0
-
Description
Reserved – write ‘0’
000: Mode 0 – Idle (Measurements are disabled in this mode)
001: Mode 1 – Constant power mode, IAQ measurement every second
010: Mode 2 – Pulse heating mode IAQ measurement every 10 seconds
011: Mode 3 – Low power pulse heating mode IAQ measurement every 60
seconds
100: Mode 4 – Constant power mode, sensor measurement every 250ms
1xx: Reserved modes (For future use)
In mode 4, the ALG_RESULT_DATA is not updated, only RAW_DATA; the processing
must be done on the host system.
A new sample is placed in ALG_RESULT_DATA and RAW_DATA registers and the
DATA_READY bit in the STATUS register is set at the defined measurement interval.
3
INT_DATARDY
0: Interrupt generation is disabled
1: The nINT signal is asserted (driven low) when a new sample is ready in
ALG_RESULT_DATA. The nINT signal will stop being driven low when
ALG_RESULT_DATA is read on the I²C interface.
At the end of each measurement cycle (250ms, 1s, 10s, 60s) a flag is set in the
STATUS register regardless of the setting of this bit..
2
INT_THRESH
1:0
-
19 ams Datasheet
[v1-06] 2019-Feb-07
0: Interrupt mode (if enabled) operates normally
1: Interrupt mode (if enabled) only asserts the nINT signal (driven low) if the new
ALG_RESULT_DATA crosses one of the thresholds set in the THRESHOLDS register
by more than the hysteresis value (also in the THRESHOLDS register)
Reserved - write 00
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CCS811 − Application Register Overview
ALG_RESULT_DATA (Algorithm Results Data)
Register (0x02)
This multi-byte read only register contains the calculated eCO2
(ppm) and eTVOC (ppb) values followed by the STATUS register,
ERROR_ID register and the RAW_DATA register.
• If only eCO2 is required, only the first 2 bytes need to be
read.
• If eTVOC is required, 4 bytes need to be read.
• In a system where interrupts are not implemented and the
host needs to poll the STATUS register to determine
whether there is new data, an efficient alternative is to
read 5 bytes in a single transaction since that returns eCO2,
eTVOC and the status register.
• Optionally, all 8 bytes could be read in a single transaction,
so that even the error status and the raw data is available.
Figure 17:
Algorithm Results Register Byte Order
Byte 0
Byte 1
eCO2 High Byte eCO2 Low Byte
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6 & 7
eTVOC High
Byte
eTVOC Low
Byte
STATUS
ERROR_ID
See RAW_DATA
RAW_DATA Register (0x03)
Two byte read only register which contains the latest readings from
the sensor.
The most significant 6 bits of the Byte 0 contain the value of the
current through the sensor (0μA to 63μA).
The lower 10 bits contain (as computed from the ADC) the
readings of the voltage across the sensor with the selected
current (1023 = 1.65V)
Figure 18:
RAW_DATA Register Byte Order
Byte 0
7
6
5
4
3
Byte 1
2
1
Current Selected 5:0
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0
7
6
5
4
3
2
1
0
Raw ADC reading 9:0
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CCS811 − Application Register Overview
ENV_DATA (Environment Data) Register (0x05)
A multi-byte register that can be written with the current
Humidity and Temperature values if known.
Relative Humidity
Figure 19:
Relative Humidity Fields and Byte Order
Byte 0
Byte 1
Humidity High Byte
Humidity Low Byte
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
64
32
16
8
4
2
1
1/2
1/4
1/8
1/16
1/32
1/64
1/128
1/256
1/512
Humidity %
Humidity % Fraction
Humidity is stored as an unsigned 16 bits in 1/512%RH. The
default value is 50% = 0x64, 0x00. As an example 48.5%
humidity would be 0x61, 0x00.
Temperature
Figure 20:
Temperature Fields and Byte Order
Byte 2
Byte 3
Temperature High Byte
Temperature Low Byte
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
64
32
16
8
4
2
1
1/2
1/4
1/8
1/16
1/32
1/64
1/128
1/256
1/512
Temperature 25°C
Temperature 25°C Fraction
Temperature is stored as an unsigned 16 bits integer in 1/512
degrees; there is an offset: 0 maps to -25°C. The default value is 25°C
= 0x64, 0x00. As an example 23.5% temperature would be 0x61,
0x00.
The internal algorithm uses ENV_DATA values (or default values if
not set by the application) to compensate for changes in
relative humidity and ambient temperature.
For temperatures below-25°C the 7-bit temperature field in Byte
2 above should be set to all zeros.
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CCS811 − Application Register Overview
THRESHOLDS Register (0x10)
If ‘interrupt on threshold change’ has been set in the Mode
register (see above), the values in this multi- byte write only
register are used to determine the thresholds.
Figure 21:
Thresholds Register Byte Order
Byte 0
Byte 1
Byte 2
Low to Medium Threshold
High Byte
Byte 3
Medium to High Threshold
Low Byte
High Byte
Low Byte
An interrupt is asserted if the eCO2 value moved from the
current range (Low, Medium, or High) into another range by
more than 50ppm.
• Low to Medium Threshold default = 1500ppm = 0x05DC
• Medium to High Threshold default = 2500ppm = 0x09C4
BASELINE Register (0x11)
A two byte read/write register which contains an encoded version
of the current baseline used in Algorithm Calculations.
A previously stored value may be written back to this two byte
register and the Algorithms will use the new value in its
calculations (until it adjusts it as part of its internal Automatic
Baseline Correction). For more information, refer to ScioSense
application note AN000370: CCS811 Clean Air Baseline Save and
Restore.
HW_ID (Hardware identifier) Register (0x20)
Single byte read only register which holds the HW ID which is 0x81
for this family of CCS81x devices.
HW_Version (Hardware Version) Register
(0x21)
Single byte read only register which holds the Hardware Major and
Minor Hardware versions.
The top four bits read major hardware version 1 – identifying the
product as CCS811. The bottom four bits identify any build variant.
The default value is 0x1X.
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CCS811 − Application Register Overview
FW_Boot_Version (Firmware Bootloader
Version) Register (0x23)
Two byte read only register which contain the version of the
firmware bootloader stored in the CCS811 in the format
Major.Minor.Trivial
Figure 22:
Firmware Bootloader Version Format
Byte 0
7
6
5
4
3
Byte 1
2
Major
1
0
7
6
5
Minor
4
3
2
1
0
Trivial
FW_App_Version (Firmware Application
Version) Register (0x24)
Two byte read only register which contain the version of the
firmware application stored in the CCS811 in the format
Major.Minor.Trivial. FW_App_Version will read FFFF when there is
no firmware application (see APP_VALID in STATUS).
Figure 23:
Firmware Application Version Format
Byte 0
7
6
5
Major
23 ams Datasheet
[v1-06] 2019-Feb-07
4
3
Byte 1
2
1
Minor
0
7
6
5
4
3
2
1
0
Trivial
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CCS811 − Application Register Overview
ERROR_ID (Error Identifier) Register (0xE0)
If the ERR bit [0] of the STATUS Register is set, this single byte
read only register indicates source(s) of the error.
Figure 24:
ERROR_ID Register Codes
Bit
ERROR_CODE
Description
0
WRITE_REG_INVALID
The CCS811 received an I²C write request addressed to this station but with
invalid register address ID
1
READ_REG_INVALID
The CCS811 received an I²C read request to a mailbox ID that is invalid
2
MEASMODE_INVALID
The CCS811 received an I²C request to write an unsupported mode to
MEAS_MODE
3
MAX_RESISTANCE
4
HEATER_FAULT
The Heater current in the CCS811 is not in range
5
HEATER_SUPPLY
The Heater voltage is not being applied correctly
6
-
Reserved for Future Use
7
-
Reserved for Future Use
The sensor resistance measurement has reached or exceeded the maximum
range
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CCS811 − Application Register Overview
SW_RESET Register (0xFF)
As an alternative to Power-On reset or Hardware Reset a
Software Reset is available.
Asserting the SW_RESET will restart the CCS811 in Boot mode
to enable new application firmware to be downloaded.
To prevent accidental SW_RESET a sequence of four bytes must be
written to this register in a single I²C sequence: 0x11, 0xE5, 0x72,
0x8A.
For details, please refer to application notes
ScioSense AN000369 and ScioSense AN000371.
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CCS811 − Bootloader Register Overview
Bootloader Register Overview
All I²C transactions must use the (7bits) slave address 0x5A or
0x5B depending on status of ADDR pin when writing to and
reading from the CCS811. Figure 25 shows the bootloader register
map for CCS811.
Figure 25:
CCS811 Bootloader Register Map
Address
Register
R/W
Size
Description
0x00
STATUS
R
1 byte
Status register
0x20
HW_ID
R
1 byte
Hardware ID. The value is 0x81
0x21
HW Version
R
1 byte
Hardware Version. The value is 0x1X
0x23
FW_Boot_Version
R
2 bytes
Firmware Boot Version. The first 2 bytes contain the
firmware version number for the boot code.
0x24
FW_App_Version
R
2 bytes
Firmware Application Version. The first 2 bytes contain
the firmware version number for the application code.
0xE0
ERROR_ID
R
1 byte
Error ID. When the status register reports an error it
source is located in this register
0xF1
APP_ERASE
W
4 bytes
If the correct 4 bytes (0xE7 0xA7 0xE6 0x09) are written
to this register in a single sequence the device will start
the application erase
0xF2
APP_DATA
W
9 bytes
Transmit flash code for the bootloader to write to the
application flash code space.
0xF3
APP_VERIFY
W
-
Starts the process of the bootloader checking though
the application to make sure a full image is valid.
0xF4
APP_START
W
-
Application start. Used to transition the CCS811 state
from boot to application mode, a write with no data is
required. Before performing a write to APP_START the
Status register should be accessed to check if there is a
valid application present.
0xFF
SW_RESET
W
4 bytes
If the correct 4 bytes (0x11 0xE5 0x72 0x8A) are written
to this register in a single sequence the device will reset
and return to BOOT mode.
Note(s):
1. The number of bytes read from a register must not exceed the size in this table.
2. For more information on performing application code download please refer to application note ScioSense AN000371.
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CCS811 − Bootloader Register Overview
Registers not detailed below are documented in the
Application Register Overview section.
APP_ERASE (Application Erase) Register (0xF1) To
prevent accidental APP_ERASE a sequence of four bytes must be
written to this register in a single I²C sequence: 0xE7, 0xA7,
0xE6, 0x09.
The APP_ERASE can take a variable amount of time. The status
register can be polled to determine when this function is
complete. The 6th bit (0x40) is initialised to 0 and set to a 1 on
completion of the APP_ERASE function. After an erase this bit is
only cleared by doing a reset or starting the application.
APP_DATA (Application Data) Register (0xF2)
Nine byte, write only register for sending small chunks of
application data which will be written in order to the CCS811 flash
code.
APP_VERIFY (Application Verify) Register
(0xF3)
Single byte write only register which starts the application
verify process run by the bootloader to check for a complete
application code image. Command only needs to be called once
after a firmware download as the result is saved in a flash
location that gets checked during device initialisation.
The APP_VERIFY can take a variable amount of time. The status
register can be polled to determine when this function is
complete. The 5th bit (0x20) is initialised to 0 and set to a 1 on
completion of the APP_VERIFY function. After an APP_VERIFY this
bit is only cleared by doing a reset or starting the
application.
For details on downloading new application firmware please
refer to application note ScioSense AN000371.
APP_START (Application Start) Register (0xF4)
To change the mode of the CCS811 from Boot mode to running the
application, a single byte write of 0xF4 is required.
The CCS811 interprets this as an address write to select the
‘APP_START’ register and starts running the loaded application
software if it is a valid version (Refer to the STATUS Register
(0x00)).
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CCS811 − Package Drawings & Marking
Package Drawings & Marking
LGA Package Outline
Figure 26:
LGA Package Drawings
Pin 1 Corner
Index Area
(Top View)
(Side View)
D
A
E
1.2
nxL
nxW
6
5
D1
e
2.4
1
Pin 1 Corner
Index Area
RoHS
10
(0.3)
Green
E1
(Bottom View)
Symbol
Total thickness
Body Size
Lead Width
Lead Length
Lead Pitch
Lead Count
Edge Lead Centre to Centre
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A
D
E
W
L
e
n
D1
E1
Min
-
0.25
0.45
Dimensions
Nominal
4.0
2.7
0.3
0.5
0.6
10
2.4
2.2
Max
1.1
BSC
BSC
0.35
0.55
BSC
BSC
BSC
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Note(s):
1. All dimensions are in millimeters.
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CCS811 − Package Drawings & Marking
The recommended package footprint or landing pattern for
CCS811 is shown below:
Figure 27:
Recommended Package Footprint for CCS811
2.7
0.6
0.3
0.75
1
10
0.3
0.4
0.6
0.4
5
1.3
0.7
(Top View)
Note(s):
1.
2.
3.
4.
All dimensions are in millimeters.
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
29 ams Datasheet
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CCS811 − Ordering & Contact Information
Ordering & Contact Information
Figure 28:
Ordering Information
Ordering Code
Description
Package
MOQ
CCS811B-JOPR5K
CCS811 digital gas sensor for Indoor
Air Quality Monitoring
2.7mm x 4.0mm x 1.1mm LGA
5000
CCS811B-JOPD500
CCS811 digital gas sensor for Indoor
Air Quality Monitoring
2.7mm x 4.0mm x 1.1mm LGA
500
Note(s):
1. Refer to JEDEC J-STD020 lead-free standard for typical soldering reflow profile
Technical Support is available at:
customersupport@sciosense.com
For further information and requests, e-mail us at:
info@sciosense.com
For sales offices, distributors and representatives, please visit:
www.sciosense.com/distribution-partners/
Headquarters
ScioSense B.V.
High Tech Campus 10
5656 AE Eindhoven
The Netherlands
Tel: +43 (0) 3136 500 0
Website: www.sciosense.com
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CCS811 − RoHS Compliant & ams Green Statement
RoHS Compliant & ams Green
Statement
RoHS: The term RoHS compliant means that ams AG products
fully comply with current RoHS directives. Our semiconductor
products do not contain any chemicals for all 6 substance
categories, including the requirement that lead not exceed
0.1 % by weight in homogeneous materials. Where designed to
be soldered at high temperatures, RoHS compliant products are
suitable for use in specified lead-free processes.
ams Green (RoHS compliant and no Sb/Br): ams Green
defines that in addition to RoHS compliance, our products are
free of Bromine (Br) and Antimony (Sb) based flame retardants
(Br or Sb do not exceed 0.1% by weight in homogeneous
material).
Important Information: The information provided in this
statement represents ams AG knowledge and belief as of the date
that it is provided. ams AG bases its knowledge and belief on
information provided by third parties, and makes no
representation or warranty as to the accuracy of such
information. Efforts are underway to better integrate
information from third parties. ams AG has taken and continues to
take reasonable steps to provide representative and accurate
information but may not have conducted destructive testing or
chemical analysis on incoming materials and chemicals. ams AG and
ams AG suppliers consider certain information to be
proprietary, and thus CAS numbers and other limited
information may not be available for release.
31 ams Datasheet
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CCS811 − Copyrights & Disclaimer
Copyrights & Disclaimer
Copyright ams AG, Tobelbader Strasse 30, 8141 Premstaetten,
Austria-Europe. Trademarks Registered. All rights reserved. The
material herein may not be reproduced, adapted, merged,
translated, stored, or used without the prior written consent of the
copyright owner.
Devices sold by ams AG are covered by the warranty and patent
indemnification provisions appearing in its General Terms of
Trade. ams AG makes no warranty, express, statutory, implied,
or by description regarding the information set forth herein.
ams AG reserves the right to change specifications and prices
at any time and without notice. Therefore, prior to designing
this product into a system, it is necessary to check with ams AG for
current information. This product is intended for use in
commercial applications. Applications requiring extended
temperature range, unusual environmental requirements, or high
reliability applications, such as military, medical
life-support or life-sustaining equipment are specifically not
recommended without additional processing by ams AG for each
application. This product is provided by ams AG “AS IS” and any
express or implied warranties, including, but not
limited to the implied warranties of merchantability and fitness for
a particular purpose are disclaimed.
ams AG shall not be liable to recipient or any third party for any
damages, including but not limited to personal injury, property
damage, loss of profits, loss of use, interruption of business or
indirect, special, incidental or consequential damages, of any kind,
in connection with or arising out of the furnishing,
performance or use of the technical data herein. No obligation or
liability to recipient or any third party shall arise or flow out of ams
AG rendering of technical or other services.
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CCS811 − Document Status
Document Status
Document Status
Product Preview
Preliminary Datasheet
Datasheet
Datasheet (discontinued)
33 ams Datasheet
[v1-06] 2019-Feb-07
Product Status
Definition
Pre-Development
Information in this datasheet is based on product ideas in
the planning phase of development. All specifications are
design goals without any warranty and are subject to
change without notice
Pre-Production
Information in this datasheet is based on products in the
design, validation or qualification phase of development.
The performance and parameters shown in this document
are preliminary without any warranty and are subject to
change without notice
Production
Discontinued
Information in this datasheet is based on products in rampup to full production or full production which conform to
specifications in accordance with the terms of ams AG
standard warranty as given in the General Terms of Trade
Information in this datasheet is based on products which
conform to specifications in accordance with the terms of
ams AG standard warranty as given in the General Terms of
Trade, but these products have been superseded and
should not be used for new designs
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CCS811 − Revision Information
Revision Information
Changes from 1-05 (2018-May-01) to current revision 1-07 (2020-Dec-16)
Page
Updated figure 6
6
Updated figure 7
7
Added figure 8
8
Added “State Machine” under “Detailed Description”
9
Added “Power States” under “Detailed Description”
10
Updated and Renamed “Early-Life Use (Burn-In)” to “Early-Life (Burn-In)”
12
Updated Conditioning Period (Run-In), eCO2, Temperature and Humidity Compensation
12
eTVOC and eCO2 limits corrected
12
Updated figure 11 and notes under it
14
Updated figure 15
18
Updated “FW_App_Version (Firmware Application Version) Register (0x24)”
23
References to ams changed to ScioSense
all
Note(s):
1. Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.
2. Correction of typographical errors is not explicitly mentioned.
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CCS811 − Appendix
Appendix
References
Figure 29:
Document Reference
Document Reference
Description
ScioSense AN000367
CCS811 Assembly guidelines
ScioSense AN000368
CCS811 Design guidelines
ScioSense AN000369
CCS811 Programming and interfacing guide
ScioSense AN000370
CCS811 Clean air baseline save and restore
ScioSense AN000371
CCS811 Performing a firmware download
ScioSense AN000373
CCS811 Factory test procedure
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CCS811 − Content Guide
Content Guide
1
2
3
4
General Description
Key Benefits & Features
Applications
Block Diagram
5
6
7
Pin Assignment
Absolute Maximum Ratings
Electrical Characteristics
9
9
10
11
11
12
12
12
12
12
13
13
Detailed Description
State Machine
Power States
Modes of Operation
Early-Life (Burn-In)
Conditioning Period (Run-In)
eCO2
eTVOC
Temperature and Humidity Compensation
Interrupt and Interrupt on Threshold
Automatic Baseline Correction
Manual Baseline Correction
14
14
15
15
16
Application Information
Host System Software Requirements
I²C Interface
I²C Register Write
I²C Register Read
17
18
19
24
25
Application Register Overview
STATUS Register (0x00)
MEAS_MODE (Measurement and Conditions) Register
(0x01)
ALG_RESULT_DATA (Algorithm Results Data) Register
(0x02)
RAW_DATA Register (0x03)
ENV_DATA (Environment Data) Register (0x05)
Relative Humidity
THRESHOLDS Register (0x10)
BASELINE Register (0x11)
HW_ID (Hardware identifier) Register (0x20)
HW_Version (Hardware Version) Register (0x21)
FW_Boot_Version (Firmware Bootloader Version) Register (0x23)
FW_App_Version (Firmware Application Version) Register (0x24)
ERROR_ID (Error Identifier) Register (0xE0)
SW_RESET Register (0xFF)
26
27
27
27
27
Bootloader Register Overview
APP_ERASE (Application Erase) Register (0xF1)
APP_DATA (Application Data) Register (0xF2)
APP_VERIFY (Application Verify) Register (0xF3)
APP_START (Application Start) Register (0xF4)
20
20
21
21
22
22
22
22
23
23
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CCS811 − Content Guide
37 ams Datasheet
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28
28
Package Drawings & Marking
LGA Package Outline
30
31
32
33
34
Ordering & Contact Information
RoHS Compliant & ams Green Statement
Copyrights & Disclaimer
Document Status
Revision Information
35
35
Appendix
References
CCS811B Datasheet Revision 2 SC-001232-DS / 2020-12-17
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