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Document number: BST-BME680-DS001-00 Revision_1.0_072017

5. Global memory map and register description

5.1 General remarks

Communication with the device is performed by reading from and writing to registers. Registers have a width of 8 bits. If I2C

is used, 8-bit addressing is utilized. If SPI is used, 7-bit address is only available for register access. For details on the

interface, consult Chapter 6.

In SPI mode complete memory map is accessed using page 0 and page 1. Register spi_mem_page is used for page selection.

After power-on, spi_mem_page is in its reset state and page 0 (0x80 to 0xFF) will be active. Page 1 (0x00 to 0x7F) will be

active on setting spi_mem_page to 1.

Global memory map consists of calibration registers, control registers, data registers, status registers and reserved registers.

There are, however, several registers which are reserved. Accordingly, they should not be written to and no specific value is

guaranteed when they are read.

Table 15: Memory map page selection

Digital Interface

Memory Page

I2C

0x00 to 0xFF

Not Applicable

SPI

0x80 to 0xFF

0 (default; power on state)

Page 0

SPI

0x00 to 0x7F

Page 1

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