Spark Logic

BMP085 digital pressure sensor connection guide

BMP085 digital pressure sensor LCC-8 · 5.0 × 5.0 mm wiring guide with power, signal assignments, and bench checks.

LCC-8 · 5.0 × 5.0 mm

8 contacts Current package

Bosch Sensortec ·

Connect an I²C host

Required

Use one 3.3 V rail for VDDA, VDDD, and the host. Tie XCLR high. The host can time conversion in software and leave EOC open.

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 between +3.3 V and Ground+3.3 VC1 100 nFGround

Bench checks

  • Look for an acknowledgement at 7-bit address 0x77 and read the 22 calibration bytes from 0xAA through 0xBF.
  • Start a temperature conversion by writing 0x2E to 0xF4. Wait at least 4.5 ms, then read the result starting at 0xF6. Follow the datasheet procedure for the separate pressure conversion.

Bosch Sensortec BMP085 Rev. 1.0 (July 2008), §§ 1, 3–5. Manufacturer document mirrored by jensd.dk.

LCC-8 · 5.0 × 5.0 mm wiring map

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

LCC-8 · 5.0 × 5.0 mm
Transparent top view with pin 1 at the upper left. Follow the land pattern when designing a PCB. Scroll the map to reach all contacts.
Selected pin details

4 · VDDD

Supply input · Power

Digital supply. Set the I²C pull-up rail to this logic voltage.

Bosch Sensortec BMP085 Rev. 1.0 (July 2008), §§ 1, 3–5. Manufacturer document mirrored by jensd.dk.

Electrical limits · Pin in the reference

Models and documents

This map covers the ceramic LCC-8 device.

BMP085
Ceramic package.