Specifications

BMA180
Preliminary data sheet
Bosch Sensortec
Rev. 1.0 Page 6 / - proprietary information - 06 March 2009
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
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.
7.8.7 dis_reg.................................................................................................................................. 32
7.8.8 wake_up................................................................................................................................ 32
7.8.9 wake_up_dur ........................................................................................................................ 33
7.8.10 slope_alert ............................................................................................................................ 33
7.8.11 dis_i2c – disable I²C ............................................................................................................. 33
7.8.12 CRC - checksum bits............................................................................................................ 34
7.8.13 ee_cd1, ee_cd2 - customer data.......................................................................................... 34
7.9 INTERRUPT SETTINGS ................................................................................................................... 34
7.9.1 adv_int .................................................................................................................................. 35
7.9.2 new_data_int ........................................................................................................................ 35
7.9.3 lat_int .................................................................................................................................... 36
7.9.4 Low-g interrupt...................................................................................................................... 36
7.9.5 High-g interrupt..................................................................................................................... 38
7.9.6 Slope interrupt (any motion interrupt)................................................................................... 40
7.9.7 Tap sensing.......................................................................................................................... 44
7.10 PERFORMANCE SETTINGS ......................................................................................................... 46
7.10.1 Gain trimming (sensitivity trimming) ..................................................................................... 46
7.10.2 Offset trimming ..................................................................................................................... 46
7.10.3 Offset_finetuning................................................................................................................... 47
7.10.4 tc0_x, tc0_y and tco_z..........................................................................................................50
7.10.5 tco_range.............................................................................................................................. 50
7.10.6 tcs, tcs_only_z ...................................................................................................................... 50
7.11 CONTROL REGISTERS DESCRIPTION ........................................................................................... 51
7.11.1 st_damp................................................................................................................................ 51
7.11.2 reset_int................................................................................................................................ 51
7.11.3 update_image....................................................................................................................... 51
7.11.4 ee_w ..................................................................................................................................... 51
7.11.5 st1 ......................................................................................................................................... 52
7.11.6 st0 ......................................................................................................................................... 52
7.11.7 st_amp.................................................................................................................................. 52
7.11.8 soft_reset.............................................................................................................................. 53
7.11.9 sleep ..................................................................................................................................... 53
7.11.10 dis_wake_up.....................................................................................................................53
7.11.11 unlock_ee.......................................................................................................................... 53
7.11.12 en_offset_x, en_offset_y, en_offset_z.............................................................................. 53
7.11.13 sel_t, sel_x, sel_y, sel_z ................................................................................................... 53
7.12 STATUS REGISTER.................................................................................................................... 54
7.12.1 first_tap sensing.................................................................................................................... 54
7.12.2 str.......................................................................................................................................... 54
7.12.3 Slope alert............................................................................................................................. 54
7.12.4 low_th_int, high_th_int, slope_int_s, tapsens_int................................................................. 54
7.12.5 low_th_s, high_th_s, slope_s, tapsens_s, offset_st_s......................................................... 54
7.12.6 offset_st_s............................................................................................................................. 54
7.12.7 x_first_int, y_first_int, z_first_int...........................................................................................54
7.12.8 Status bits for acceleration or slope sign.............................................................................. 55
7.12.9 ee_write ................................................................................................................................ 55
7.13 DATA REGISTERS ..................................................................................................................... 55
7.13.1 temp...................................................................................................................................... 55
7.13.2 acc_x, acc_y, acc_z .............................................................................................................55
7.13.3 al_version<3:0>, ml_version<3:0>, chip_id<2:0> ................................................................ 57
8
I²C AND SPI-INTERFACES................................................................................................................ 58