BMC150 datasheet(22/142 Pages) BOSCH

22 / 142 page

Datasheet

eCompass BMC150

Page 22

BST-BMC150-DS000-04 | Revision 1.0 | July 2014

Bosch Sensortec

third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.

Note: Specifications within this document are subject to change without notice. Not intended for publication.

4.2.2 Magnetometer power modes

The BMC150 magnetometer part features configurable power modes. The four power modes of

the BMC150 magnetometer are decribed in the following chapters.

Power off mode

In Power off mode, VDD and/or VDDIO are unpowered. The magnetometer part does not operate

in this mode. When only one of VDD or VDDIO is supplied, the magnetic sensor will still be in

Power off mode. Power on reset is performed after both VDD and VDDIO have risen above their

detection thresholds.

Suspend mode

Suspend mode is the default power mode of BMC150 magnetometer part after the chip is

powered. When VDD and VDDIO are turned on the POR (power on reset) circuits operate and

the device’s registers are initialized. After POR becomes inactive, a start up sequence is

executed. In this sequence NVM content is downloaded to shadow registers located in the

device core. After the start up sequence the device is put in the Suspend mode. In this mode

only registers which store power control bit information and SPI 3 wire enable can be accessed

by the user. In this mode only registers supplied directly by VDDIO which store I2C slave device

address, power control bit information and some others can be accessed by the user. No other

registers can be accessed in Suspend mode. All registers loose their content, except the control

high-Z (SPI).

BMC150 Datasheet(PDF) 22 Page - Bosch Sensortec GmbH