BMA150 datasheet(20/55 Pages) ETC2

20 / 55 page

Data sheet

BMA150

Triaxial, digital acceleration sensor

Bosch Sensortec

Rev. 1.5

Page 20

30 May 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.

3.3 Control registers

All single control bits are active at 1.

3.3.1 Reset_INT

This interrupt (address 0Ah, bit 6) is reset (interrupt pad goes to low) each time this bit is written

to 1.

3.3.2 Update_image

When this bit (address 0Ah, bit 5) is set at 1, an image update procedure is started: all

EEPROM content is copied to image registers. The bit update_image is turned at 0 when the

procedure is finished. No write or read to image registers and EEPROM write is allowed during

their update from EEPROM. An automatic update image procedure also occurs after power on

reset and after soft_reset has been written to 1.

The update_image procedure may overwrite the SPI4 setting (section 3.1.1). Thus the correct

interface configuration may have to be updated.

3.3.3 Ee_w

ee_w (address 0Ah, bit 4) is used to enable/disable the access to default setting registers.

This bit must first be written to 1 to enable write access to 16h to 3D and to enable read access

to 16h to 22h. When this bit is at 0, any access to addresses from 16h to 7Fh has no effect; any

read to these addresses set SDO to tri-state (4-wire SPI) or SDI to tri-state (3-wire SPI and I²C).

This is valid for all serial interface (I²C, SPI 3-wire or SPI 4-wire).

I²C acknowledgement procedure for access to non-protected or blocked memory regions:

- I²C slave address:

if correct, the BMA150 sets acknowledge.

- I²C register address (I²C write):

The BMA150 sets acknowledge for both unprotected and

protected registers.

- I²C write data (I²C write):

The BMA150 sets acknowledge for both unprotected and

protected resisters; no write is done for protected register.

- I²C read data (I²C read):

acknowledge is set by master; no error detection is

possible; SDI is set to Hi-Z for protected register (0xFF is

sent)

After power on reset ee_w=0. So EEPROM and all addresses from 16h to 7Fh can not be

directly written or read.

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