Data sheet

BMA220

Page 9

BST-BMA220-DS003-08 | Revision 1.15 | August 2011

Bosch Sensortec

© 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.

Note: Specifications within this document are subject to change without notice.

4. Global memory map

The memory map below shows all externally accessible data registers which are needed to

operate BMA220.The left columns show the memory addresses. The columns in the middle

depict the content of each register bit. The colors of the bits indicate whether they are read-only,

write-only or read- and writable. The memory is volatile so that the writable content has to be re-

written after each power-on.

are reserved for further Bosch factory testing and trimming.

Register

Address

(I²C)

Register

Address

(SPI)

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

default after

power-up

0x32

0x19

0x00

0x30

0x18

0x00

0x2E

0x17

WDT_TO_en

WDT_TO_sel

SPI3

0x00

0x2C

0x16

0x00

0x2A

0x15

0x00

0x28

0x14

0x00

0x26

0x13

0x00

0x24

0x12

0x10

0x22

0x11

sbist_sign

0x00

0x20

0x10

serial_high_bw

0x00

0x1E

0x0F

unused

sleep_en

en_x_channel

en_y_channel

en_z_channel

0x07

0x1C

0x0E

reset_int

en_low

en_high_x

en_high_y

en_high_z

0x00

0x1A

0x0D

en_data

en_orient

en_slope_x

en_slope_y

en_slope_z

en_tt_x

en_tt_y

en_tt_z

0x00

0x18

0x0C

tt_int

low_int

high_int

data_int

slope_int

0x00

0x16

0x0B

orient_int

int_first_x

int_first_y

int_first_z

int_sign

0x00

0x14

0x0A

tip_en

0x08

0x12

0x09

orient_ex

slope_filt

0x45

0x10

0x08

tt_filt

0xB5

0xE

0x07

0x7F

0xC

0x06

0x4E

0xA

0x05

0x7F

0x8

0x04

0

0

0x00

0x6

0x03

0

0

0x00

0x4

0x02

0

0

0x00

0x2

0x01

0x00

0x0

0x00

0xDD

Chip ID

tt_samp[1:0]

slope_th[3:0]

slope_dur[1:0]

tt_th[3:0]

tt_dur[2:0]

acc_z<5:0>

acc_y<5:0>

acc_x<5:0>

Revision ID

low_th[3:0]

high_th[3:0]

high_hy[1:0]

high_dur[5:0]

low_hy[1:0]

low_dur[5:0]

orient_blocking [1:0]

unused

lat_int[2:0]

unused

orient[2:0]

sbist (off,x,y,z)

filt_config[3:0]

unused

unused

range[1:0]

sleep_dur[2:0]

reserved

reserved

reserved

reserved

softreset

suspend

unused

reserved

Figure 2: Memory map

Note:

From SPI  I²C use burst address increment in 0x02h steps.

4.1 Control registers

4.1.1 3-wire SPI mode selection

The BMA220 supports both 4-wire and 3-wire SPI. The protocols are exactly the same except

for the fact that in 3-wire mode, the SDI pin is also used for data output.

The default mode is 4-wire SPI. If 3-wire SPI should be used, the SPI3 bit in register 0x17 (SPI)

must be set to ‘1’.