BETAPIN 1 · Serial data
Bidirectional dataSDA
Function
I²C data connection.
How to connect
Pull up to the logic rail; connect to the controller SDA.
Electrical note
Open-drain; choose the pullup for bus capacitance and frequency.
SHT31-DIS digital humidity and temperature sensor
SHT31 Pinout
Explore SHT31 pins, signal names, electrical functions and connection guidance for each package.
9Physical pins
SHT31-DIS-BDFN-8 + EP
Manufacturer-referencedSensirion
Pin diagram
Select a pin to explore its connection
Highlight
SHT31DFN-8 + EPTop view · contact 9 is the underside ground pad
Click a lead or use the arrow keys. Top view · contact 9 is the underside ground pad
PIN 2 · Address strap
Address selectionADDR
Function
Selects the seven-bit bus address.
How to connect
Tie LOW for 0x44 or HIGH for 0x45; do not leave floating.
Electrical note
Keep stable throughout the I²C transaction.
PIN 3 · Alert
Alert outputALERT
Function
Indicates configured temperature or humidity limits.
How to connect
Connect to a compatible controller input, or leave open if unused.
PIN 4 · Serial clock
Serial clockSCL
Function
I²C clock connection.
How to connect
Connect to controller SCL with an external pullup.
Electrical note
Choose a controller that supports clock stretching if that command mode is used.
PIN 5 · Supply
SupplyVDD
Function
Positive sensor rail.
How to connect
Use 2.15–5.5 V with 100 nF close to VDD/VSS.
PIN 6 · Reset
Active-low resetnRESET
Function
Resets the sensor when pulled LOW.
How to connect
May be left open when unused; an optional pullup to VDD must be at least 2 kΩ.
Electrical note
Do not hard-wire this input directly to VDD.
PIN 7 · Ground
Reserved contactR
Function
No functional signal.
How to connect
Connect to VSS as directed by the datasheet.
PIN 8 · Ground
GroundVSS
Function
Supply and interface return.
How to connect
Connect to controller ground.
PIN 9 · Ground
Exposed center padEP
Function
Underside pad, internally connected to VSS.
How to connect
Solder to a ground land for mechanical support.
Electrical note
Contact 9 is the footprint identifier for the unnumbered die pad, not a ninth perimeter pin.