BMA150 datasheet(24/56 Pages) BOSCH

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Data sheet

BMA150

Triaxial, digital acceleration sensor

Bosch Sensortec

Rev. 1.6

Page 24

30 October 2008

as copying and passing on to 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.

Synchronization of read-out sequence has several advantages:

− it enables a constant phase shift between acceleration conversion and its corresponding

digital value read by microprocessor

− it reduces interface communication by avoiding over-sampling.

− potential noise due to serial interface activity perturbation would always be generated

during a less critical phase of the conversion cycle. The maximum delay advised to start

read out acceleration data is 20µs after INT high (window 0 - 80µs).

3.5.3 New_data_x, new_data_y, new_data_z

These bits (New_data_x (02h, 0), new_data_y (04h, 0), new_data_z (06h, 0)) are flags which

are turned at 1 when acceleration registers have been updated. Reading acceleration data MSB

or LSB registers turns the flags at 0. The flag value can be read by microprocessor.

3.5.4 Al_version, ml_version, chip_id

al_version (address 01h, bit 7-4) and ml_version (address 01h, bit 3-0) are used to identify the

chip revision. These codes are programmed with metal layer.

chip_id (address 00h, bit 2-0) is used by customer to be able to recognize BMA150. This code is

fixed to 010b.

BMA150 Datasheet(PDF) 24 Page - Bosch Sensortec GmbH