ENS160

ENS160 Digital Metal Oxide Multi-Gas Sensor ENS160 Datasheet Revision: 0.95 Release Date: December 2020 Document Status: Preliminary / Pre-Production Digital Metal-Oxide Multi-Gas Sensor The ENS160 is a digital multi-gas sensor solution, based on metal oxide (MOX) technology with four MOX sensor elements. Each sensor element has independent hotplate control to detect a wide range of gases e.g. volatile organic compounds (VOCs) including ethanol, toluene, as well as hydrogen and nitrogen dioxide with superior selectivity and accuracy. For indoor air quality applications, the ENS160 supports intelligent algorithms to digitally process raw sensor measurements on-chip. These algorithms calculate CO2-equivalents, TVOC, air quality indices (AQIs) and perform humidity and temperature compensation, as well as baseline management – all on chip! Moreover, a development option is available to digitally output raw sensor measurements from each sensor element for customization. The LGA-packaged device includes an SPI or I²C slave interface with separate VDDIO to communicate with a main host processor. The ENS160 is a proven and maintenance-free technology, designed for high volume and reliability. Key Features & Benefits Applications TrueVOC™ air quality detection with industry-leading purity and stability, providing multiple outputs e.g. eCO21, TVOC and AQIs2 in compliance with worldwide IAQ3signal standards • Independent sensor heater control for highest selectivity (e.g. to ethanol, toluene, acetone, NO2) and outstanding background discrimination • • Building Automation / Smarthome / HVAC6 o Indoor air quality detection o Demand-controlled ventilation o Smart thermostats Home appliances o Cooker hoods o Air cleaners / purifiers IoT devices Immunity to siloxanes and humidity4 Properties Hassle-free on-chip heater drive control and data processing – no need for external libraries – no mainboard-CPU performance impacts • • Interrupt on threshold for low-power applications • Small-3 x 3 x 0.9mm LGA package Design-flexibility through standard, fast and fast mode plus I2C- and SPIinterfaces with separate VDDIO up to 3.6V T&R packaged, reflow-solderable7 Wide operating ranges: temperature: -40 to +85°C; humidity: 5 to 95%5; VDD: 1.71 to 1.98V; VDDIO 1.71 to 3.6V 1 eCO2 = equivalent CO2 values for compatibility with HVAC ventilation standards 2 AQI = Air Quality Index 3 IAQ = Indoor Air Quality 2 4 T/RH compensation via external T/RH-input Non-condensing 6 HVAC = Heat, Ventilation and Air Conditioning 7 See section “Soldering Information” for further details 5 ENS160 Datasheet v0.95 preliminary / December 2020 Content Guide Key Features & Benefits .................... 2 14.2.2 SPI Timing Information ......... 21 Applications .................................. 2 14.2.3 SPI Read Operation.............. 22 Properties ..................................... 2 14.2.4 SPI Write Operation ............. 22 1 Block Diagram ............................ 4 15 Operation ............................... 23 2 Pin Assignment ........................... 5 16 Registers ................................ 24 3 Absolute Maximum Ratings ............. 6 16.1 Register Overview .................. 24 4 Electrical Characteristics ............... 7 16.2 Detailed Register Description ..... 25 5 Air Quality Signal Characteristics ..... 8 16.2.1 PART_ID (Address 0x00) ........ 25 5.1 TVOC – Total Volatile Organic Compounds ............................ 8 16.2.2 OPMODE (Address 0x10) ........ 25 5.2 eCO2 – Equivalent CO2 ................ 8 16.2.3 CONFIG (Address 0x11) ......... 25 5.3 AQI-UBA – Air Quality Index of the UBA ................................... 10 16.2.4 COMMAND (Address 0x12) ...... 26 16.2.5 TEMP_IN (Address 0x13) ........ 27 6 Single Gas Signal Characteristics .... 11 16.2.6 RH_IN (Address 0x15) ........... 27 7 Gas Sensor Raw Resistance Signals .. 12 16.2.7 DATA_STATUS (Address 0x20) . 28 8 Signal Conditioning .................... 14 16.2.8 DATA_AQI (Address 0x21) ...... 28 8.1 Baselining ............................ 14 16.2.9 DATA_TVOC (Address 0x22) .... 29 8.2 Humidity Behavior & Compensation .................................... 14 16.2.10 DATA_ECO2 (Address 0x24) .... 29 Output Signal Accuracy ............... 15 16.2.12 DATA_T (Address 0x30) ......... 29 10 Initial Start-Up and Warm-Up ........ 15 16.2.13 DATA_RH (Address 0x32) ....... 30 10.1 Initial Start-Up ...................... 15 16.2.14 DATA_MISR (Address 0x38) ..... 30 10.2 Warm-Up ............................. 15 16.2.15 GPR_WRITE (Address 0x40) .... 31 11 Gas Sensor Status and Signal Rating 16 16.2.16 GPR_READ (Address 0x48) ...... 32 12 Recommended Sensor Operation .... 16 17 Application Information .............. 33 13 Recommended Sensor Storage ....... 16 17.1 I2C Operation Circuitry ............. 33 14 Host Communication .................. 17 17.2 SPI Operation Circuitry............. 34 9 2 14.1 I C Specification .................... 17 14.1.1 14.1.2 16.2.11 DATA_ETOH (Address 0x22) .... 29 18 Soldering Information ................. 35 2 19 Package Drawings & Markings ........ 36 2 I C Description ................... 17 I C I/O and Timing Information 17 14.1.3 I C Read Operation .............. 19 20 RoHS Compliance & ScioSense Green Statement .............................. 38 14.1.4 I2C Write Operation ............. 20 21 Copyrights & Disclaimer .............. 38 14.2 SPI Specification .................... 21 22 Document Status ....................... 39 14.2.1 23 Revision Information .................. 39 2 SPI Description ................... 21 ENS160 Datasheet v0.95 preliminary / December 2020 3 1 Block Diagram The ENS160 digital multi-gas sensor consists of four independent heaters and gas sensor elements, based on metal oxide (MOX) technology and a controller as shown in the functional block diagram below. Figure 1: Functional Blocks ENS160 4 Independent Sensors Heaters VDD Sensors VDDIO GND Controller Heater Driver x4 Sensor Measurement x4 INTn CSn SCL (SCLK) SDA (MOSI) I2C (SPI) System Control Memory Data Processing ADDR (MISO) The Heater Driver controls the sensor operating modes and provides power to the heaters of each individual sensor element. During operation the heater driver regulates the heaters to their individual set-points. The Sensor Measurement block determines the value of the sensor resistance for each individual sensor element. The System Control block processes the resistance values internally to output calculated TVOC, CO2-equivalents, AQIs and further signals on the digital interface. The ENS160 includes a standard 2-wire digital I2C interface (SCL, SDA) or 4-wire digital SPI interface (SCLK, MOSI, MISO, CSn) for communication to the main host processor. On-chip memory is used to store calibration values. 4 ENS160 Datasheet v0.95 preliminary / December 2020 2 Pin Assignment Figure 2: Pin Diagram Bottom View Top View Pin 1 Corner Corner Area 1 8 7 3 4 5 2 9 6 2 9 6 3 4 5 1 8 7 Pin 1 Corner Corner Area Table 1: Pin Description Pins Pin Name Pin Type 1 MOSI / SDA Input / Output 2 SCLK / SCL Input 3 MISO / ADDR Input / Output 4 5 6 7 8, 9 VDD VDDIO INTn CSn VSS Supply Supply Output Input Supply Description SPI Master Output Slave Input / I²C Bus Bi-Directional Data SPI Serial Clock / I²C Bus Serial Clock Input SPI Master Input Slave Output / I²C Address Select: I2C ADDR pin high -> 0x53 / ADDR pin low -> 0x52 Main Supply Voltage Interface Supply Pins Interrupt to Host SPI Interface Select (CSn low -> SPI / CSn high -> I2C) Ground Supply Voltage Also see sections “I2C Operation Circuitry” and “SPI Operation Circuitry” for wiring. ENS160 Datasheet v0.95 preliminary / December 2020 5 3 Absolute Maximum Ratings Table 2: Absolute Maximum Ratings Symbol VDD VDDIO VIO1 VIO2 VSS ISCR ESDHBM ESDCDM MSL TBODY TSTRG RHSTRG TAMB1 RHAMB1 Parameter Supply Voltage I/O Interface Supply MOSI/SDA, SCLK/SCL MISO/ADDR, INTn, CSn Input Ground Input Current (latch-up immunity) Min Max Electrical Parameters -0.3 1.98 -0.3 3.6 -0.3 3.6 -0.3 VDDIO+0.3 -0.3 0.3 Units ± 100 Electrostatic Discharge Electrostatic Discharge HBM ± 2000 Electrostatic Discharge CDM ± 750 Operating and Storage Conditions Moisture Sensitivity Level 1 Max. Package Body 260 Temperature Storage Temperature -40 125 Storage Relative Humidity 5 95 Operating Ambient -40 85 Temperature Operating Ambient Rel. 5 95 Humidity Comments V V V V V mA V V AEC-Q100-004 JS-001-2014 JS-002-2014 Unlimited floor lifetime °C IPC/JEDEC J-STD-020 °C % Non-condensing °C % Non-condensing 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 and lifetime. Important Note: The ENS160 is not designed for use in safety-critical or life-protecting applications. 1 The ENS160 is electrically operable in this range, however its gas sensing performance might vary. Please refer to “Recommended Sensor Operation” for further information. 6 ENS160 Datasheet v0.95 preliminary / December 2020 4 Electrical Characteristics The following figure details the electrical characteristics of the ENS160. Table 3: Electrical Characteristics Symbol VDD VDDIO IDD IDD_PK VIH VIL VOH VOL Parameter Positive supply IO Supply Voltage Average1 Supply Current2 Peak Supply Current4 High-level input voltage Low-level input voltage High-level output voltage Low-level output voltage Conditions Min 1.71 1.71 DEEPSLEEP (OP_MODE 0x00)3 IDLE (OP_MODE 0x01)3 STANDARD (OP_MODE 0x02) STANDARD (OP_MODE 0x02) Typ 1.8 Max 1.98 3.6 0.01 2 mA 2.5 mA 24 mA 65 (