Specifications

BMA180

Preliminary data sheet

Bosch Sensortec

Rev. 1.0 Page 29 / - proprietary information - 06 March 2009

as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.

Specifications within this document are preliminary and subject to change without notice. Document is not intended for publication.

offset_x, offset_y, offset_z, offset_t middle code

gain_x, gain_y, gain_z, gain_t middle code

tco_x, tco_y, tco_z middle code

tcs middle code

bw 0100b

range 010b

wake_up_dur 10b

slope_dur, mot_cd_r, ff_cd_r,

offset_finetuning

01b

mode_config 00b

tapsens_dur 100b

adv_int 1b

high_th 01010000b

low_th 00010111b

high_dur 0110010b

low_dur 1010000b

high_int_*, low_int_*,

tapsens_int_*, slope_int_*

All bits, which are not-mentioned in above table are set by default to 0b.

7.5.6 ee_w_flag - EEPROM-written flag

This EEPROM bit is set to ‘1’ as soon as the first EEPROM write to addresses 40h to 5Bh

occurs. Any write operation to the non-protected area results in updating of internal registers

and ee_w_flag will automatically be set to 1; the user is not able to write this flag back to “0”,

since it is placed in the EEPROM protected area.

Remark: please do no mix ee_w_flag with ee_w bit.

7.5.7 EEPROM Endurance

An EEPROM is inherently limited to a maximum number of write cycles. If more cycles are

performed, failures can occur which affect the functionality of the sensor. In case of the BMA180

the specified numbers of write cycles is 1000. This maximum number of write cycles should not

be exceeded in any application in order to prevent possible failures.

7.6 Image writing

Writing to Image is locked by default to prevent mal-function. To unlock writing, use same

command as for EEPROM writing -> set ee_w to ‘1’.

7.7 Image reading

Direct reading of the image is possible: no unlock procedure has to be performed.