BETAPIN 1 · Ground
GroundGND
Function
First ground pad.
How to connect
Join common ground; connect pad 7 too.
Digital barometric pressure sensor
BMP280 Pinout
Explore BMP280 pins, signal names, electrical functions and connection guidance for each package.
8Physical pins
BMP280LGA-8
Manufacturer-referencedBosch Sensortec
Pin diagram
Select a pin to explore its connection
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BMP280LGA-8Top view · clockwise numbering
Click a lead or use the arrow keys. Top view · clockwise numbering
PIN 2 · Mode and address
Active-low SPI selectCSB
Function
Selects the digital interface.
How to connect
Tie directly to VDDIO for I²C; use controller chip-select for SPI.
Electrical note
For I²C it must already be high during power-on reset.
PIN 3 · Serial interface
Serial dataSDI / SDA
Function
SPI input, shared three-wire data or I²C bidirectional data.
How to connect
Connect to 3.3 V controller SDA and a 4.7 kΩ pull-up in the example.
PIN 4 · Serial interface
Serial clockSCK / SCL
Function
SPI or I²C clock from the host.
How to connect
Connect to controller SCL with a pull-up to VDDIO for I²C.
PIN 5 · Mode and address
SPI output / I²C addressSDO / ADDR
Function
SPI serial output; the I²C address bit is sampled from its level.
How to connect
Tie to GND for 0x76 or VDDIO for 0x77 in I²C.
Electrical note
Do not leave floating in I²C; unconnected in three-wire SPI.
PIN 6 · Supply
Interface supplyVDDIO
Function
Supplies the digital input/output domain.
How to connect
Use 3.3 V and 100 nF to GND in this example.
Electrical note
Operating range 1.2–3.6 V; no 5 V bus pull-ups.
PIN 7 · Ground
GroundGND
Function
Second ground pad.
How to connect
Join pad 1 and controller ground.
PIN 8 · Supply
Sensor supplyVDD
Function
Powers the analog sensing and conversion circuitry.
How to connect
Use 3.3 V and a separate 100 nF to GND.
Electrical note
Operating range 1.71–3.6 V.