Content Guide
Key Features & Benefits ......................... 2
Applications ....................................... 2
Properties ......................................... 2
Content Guide .................................... 3
1 Block Diagram ........................... 4
2 Pin Assignment .......................... 5
3 Absolute Maximum Ratings ............ 6
4 Electrical Characteristics .............. 7
5 Air Quality Signal Characteristics .... 8
5.1 TVOC – Total Volatile Organic
Compounds .............................. 8
5.2 eCO
2
– Equivalent CO
2
.................. 8
6 Humidity Compensation .............. 10
7 Output Signal Accuracy ............... 11
8 Initial Start-Up and Warm-Up ........ 11
8.1 Initial Start-Up ......................... 11
8.2 Warm-Up ................................ 11
9 Recommended Sensor Operation .... 12
10 Recommended Sensor Storage ....... 12
11 Host Communication .................. 13
11.1 I
2
C Specification ....................... 13
11.1.1 I
2
C Description ......................... 13
11.1.2 I
2
C I/O and Timing Information ...... 13
11.1.3 I
2
C Read Operation .................... 15
11.1.4 I
2
C Write Operation ................... 16
11.2 SPI Specification ....................... 17
11.2.1 SPI Description ......................... 17
11.2.2 SPI Timing Information ................ 17
11.2.3 SPI Read Operation .................... 18
11.2.4 SPI Write Operation ................... 18
12 Functional Description ................ 18
13 Operation ............................... 19
14 Registers ................................ 20
14.1 Register Overview ..................... 20
14.2 Detailed Register Description ........ 21
14.2.1 PART_ID (Address 0x00) ............... 21
14.2.2 OPMODE (Address 0x10) ............... 21
14.2.3 CONFIG (Address 0x11) ................ 21
14.2.4 COMMAND (Address 0x12) ............. 22
14.2.5 TEMP_IN (Address 0x13) .............. 23
14.2.6 RH_IN (Address 0x15) .................. 23
14.2.7 DATA_STATUS (Address 0x20) ........ 24
14.2.8 DATA_TVOC (Address 0x22) .......... 24
14.2.9 DATA_ECO2 (Address 0x24) ........... 25
14.2.10 DATA_T (Address 0x30) ............... 25
14.2.11 DATA_RH (Address 0x32) .............. 25
14.2.12 DATA_MISR (Address 0x38) ........... 26
14.2.13 GPR_WRITE (Address 0x40) ........... 27
14.2.14 GPR_READ (Address 0x48) ............ 27
15 Application Information ............... 28
15.1 I
2
C Operation Circuitry ................ 28
15.2 SPI Operation Circuitry ................ 29
16 Soldering Information ................. 30
17 Package Drawings & Markings ........ 31
18 Ordering & Contact Information ..... 32
19 RoHS Compliance & ScioSense Green
Statement ............................... 33
20 Copyrights & Disclaimer .............. 33
21 Document Status ....................... 34
22 Revision Information .................. 34
