Spark Logic

BME280 humidity and pressure sensor connection guide

BME280 humidity and pressure sensor LGA-8 · 2.5 × 2.5 mm wiring guide with power, signal assignments, and bench checks.

LGA-8 · 2.5 × 2.5 mm

8 contacts Current package

Bosch Sensortec ·

Connect an I²C host

Required

Power the bare sensor and host from 3.3 V. Tie CSB to VDDIO and SDO to ground for address 0x76. Use 0x77 if SDO is tied to VDDIO.

R1 4.7 kΩ between +3.3 V and I²C data+3.3 VR1 4.7 kΩI²C data
R2 4.7 kΩ between +3.3 V and I²C clock+3.3 VR2 4.7 kΩI²C clock
C1 100 nF (VDD) between +3.3 V and Ground+3.3 VC1 100 nF (VDD)Ground
C2 100 nF (VDDIO) between +3.3 V and Ground+3.3 VC2 100 nF (VDDIO)Ground

Bench checks

  • At 100 kHz on a short bus, find an acknowledgement at the address selected by SDO.
  • Read chip ID register 0xD0. A BME280 production part returns 0x60.
  • Read the factory calibration coefficients and use the manufacturer’s compensation algorithm for each enabled measurement.

Bosch Sensortec BST-BME280-DS001-24, §§ 1, 5–7.

Connection scenarios

Connect a 4-wire SPI host

Use a 3.3 V SPI host with separate data lines. Keep chip select high at idle and pull it low for each transaction.

C1 100 nF (VDD) between +3.3 V and Ground+3.3 VC1 100 nF (VDD)Ground
C2 100 nF (VDDIO) between +3.3 V and Ground+3.3 VC2 100 nF (VDDIO)Ground

Bench checks

  • Start at 1 MHz in mode 0. To read the ID, send 0xD0 and clock in the next byte with CSB held low.
  • Read chip ID register 0xD0. A BME280 production part returns 0x60.
  • Read the factory calibration coefficients and use the manufacturer’s compensation algorithm for each enabled measurement.

Bosch Sensortec BST-BME280-DS001-24, §§ 1, 5–7.

LGA-8 · 2.5 × 2.5 mm wiring map

Highlighted contacts are used in the required step or selected circuit. Select a contact to inspect it.

Transparent top view, with pin 1 at the upper right and clockwise numbering.
Selected pin details

2 · CSB

Input · Control

Active-low SPI chip select. Tie directly to VDDIO for I²C before applying power.

Bosch Sensortec BST-BME280-DS001-24, §§ 1, 5–7.

Electrical limits · Pin in the reference

Models and documents

This map is for the bare LGA sensor. Breakout headers and logic-voltage limits depend on the board.

0 273 141 185
Bosch sales part number.