BMC150 datasheet(27/141 Pages) ETC2

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Datasheet

eCompass BMC150

Page 27

Confidential

BST-BMC150-DS000-03 | Revision 0.4 | February 2013

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.

The BMC150’s accelerometer part supports four different acceleration measurement ranges. A

measurement range is selected by setting the (0x0F) range bits as follows:

Table 10: Range selection

Range

Acceleration measurement

range

Resolution

0011

±2g

0.98mg/LSB

0101

±4g

1.95mg/LSB

1000

±8g

3.91mg/LSB

1100

±16g

7.81mg/LSB

others

reserved

4.3.2 Temperature sensor

The width of temperature data is 8 bits given in two´s complement representation. Temperature

values are available in the (0x08) temp register.

The slope of the temperature sensor is 0.5K/LSB, its center temperature is 24°C [(0x08) temp =

0x00].

4.3.3 Magnetic field data

The representation of magnetic field data is different between X/Y-axis and Z-axis. The width of

X- and Y-axis magnetic field data is 13 bits each and stored in two’s complement.

DATAX_LSB (0x42) contains 5-bit LSB part [4:0] of the 13 bit output data of the X-channel.

DATAX_MSB (0x43) contains 8-bit MSB part [12:5] of the 13 bit output data of the X-channel.

DATAY_LSB (0x44) contains 5-bit LSB part [4:0] of the 13 bit output data of the Y-channel.

DATAY_MSB (0x45) contains 8-bit MSB part [12:5] of the 13 bit output data of the Y-channel.

The width of the Z-axis magnetic field data is 15 bit word stored in two’s complement.

DATAZ_LSB (0x46) contains 7-bit LSB part [6:0] of the 15 bit output data of the Z-channel.

DATAZ_MSB (0x47) contains 8-bit MSB part [14:7] of the 15 bit output data of the Z-channel.

For all axes, temperature compensation on the host is used to get ideally matching sensitivity

over the full temperature range. The temperature compensation is based on a resistance

measurement of the hall sensor plate. The resistance value is represented by a 14 bit unsigned

output word.

RHALL_LSB (0x48) contains 6-bit LSB part [5:0] of the 14 bit output data of the RHALL-

channel.

RHALL_MSB (0x49) contains 8-bit MSB part [13:6] of the 14 bit output data of the RHALL-

channel.

All signed register values are in two´s complement representation. Bits which are marked

“reserved” can have different values or can in some cases not be read at all (read will return

0x00 in I²C mode and high-Z in SPI mode).

Data register readout and shadowing is implemented as follows:

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