CCS811

Part: CCS811 — ams Type: Ultra-Low Power Digital Gas Sensor Description: The CCS811 is an ultra-low power digital gas sensor solution integrating a metal oxide (MOX) gas sensor to detect Volatile Organic Compounds (VOCs) for indoor air quality monitoring, with an integrated MCU, ADC, and I²C interface.

Operating Conditions:

• Supply voltage: 1.8–3.3 V
• Operating temperature: -5 to 50 °C
• I²C bus frequency: 10–400 kHz

Absolute Maximum Ratings:

• Max supply voltage: 3.6 V
• Max supply current: 30 mA (In mode 1)
• Max power consumption: 60 mW (In mode 1)
• Max storage temperature: 125 °C

Key Specs:

• Supply Current (measuring): 26 mA (Typ, at 1.8V)
• Supply Current (average over pulse cycle): 0.7 mA (Typ, at 1.8V)
• Supply Current (Sleep Mode): 19 μA (Typ, at 1.8V)
• Power Consumption (Mode 1 & 4): 46 mW (Typ, at 1.8V)
• Power Consumption (Mode 3): 1.2 mW (Typ, at 1.8V)
• eCO₂ output range: 400ppm to 8192ppm
• TVOC output range: 0ppb to 1187ppb

Features:

• Integrated MCU for sensor drive modes and raw data management
• On-board processing for eCO₂ or TVOC indication
• Standard I²C digital interface
• Optimised low-power modes
• Small form-factor 2.7mm x 4.0mm x 1.1mm LGA package
• Automatic and Manual Baseline Correction
• Optional NTC circuit for ambient temperature sensing
• Interrupt and Interrupt on Threshold functionality

Applications:

• Smart phones
• Wearables
• Home and Building automation
• Accessories

Package:

• 10 lead 2.7mm x 4.0mm x 1.1mm, 0.6mm pitch LGA package

The benefits and features of CCS811, Ultra-Low Power Digital Gas Sensor for Monitoring Indoor Air Quality are listed below:

Figure 2: CCS811 Block Diagram

This device can be mainly used for indoor air quality monitoring in:

• Smart phones
• Wearables
• Home and Building automation
• Accessories

Figure 3: Pin Diagram

Pin Diagram:

The Exposed Pad is underneath

Figure 4:

CCS811 LGA Pin Assignment

Figure 6: Electrical Characteristics

1. The supply voltage V DD 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 (I DD ) 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 o C and 50% RH

Figure 7:

Figure 5: Absolute Maximum Ratings

1. The supply voltage V DD is sampled during boot and should not vary during operation.

2. The minimum supply voltage V DD is 1.8V and should not drop below this value for reliable device operation.

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 8: Recommended Application Circuit

1. Pull-up resistors for SCL and SDA assumed will be part of host system.
2. AUX Pin on CCS811 can be used for optional ambient temperature sensing, if not used leave unconnected.
3. If power is not an issue, nWake can be connected to ground if a spare GPIO is not available on the host processor.

Figure 24: LGA Package Drawings

1. All dimensions are in millimeters.