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Data sheet

BMA220

Page 23

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

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.

Table 10: Control and status register for tap sensing

Name

Address

(SPI) *

Description

Number of

bits

Reset-value

en_tt_x

en_tt_y

en_tt_z

0x0D.2

0x0D.1

0x0D.0

enable tap sensing detection

on x-axis

enable tap sensing detection

on y-axis

enable tap sensing detection

on z-axis

3 “000”

tt_th 0x08[6:3]

define the threshold level of the tap

sensing slope

1 LSB is 2*(LSB of acc_data)

TT_TH_NUM

TT_TH_INIT

“0110”

tt_dur 0x08[2:0]

define the maximum delay of the

second tap after the shock

suppression (50, 105, 150, 219,

250, 375, 500, 700)ms

TT_DUR_NU

TT_DUR_INIT

“101”

tt_filt 0x08.7

defines whether filtered or unfiltered

acceleration data should be used

(evaluated) (‘0’=unfiltered,

‘1’=filtered)

1 ‘1’

tip_en 0x0A.4

whether tap or double-tap shall be

detected (0= double tap, 1=tap)

1 ‘0’

tt_int 0x0C.4

whether tap sensing interrupt has

been triggered (0=no, 1=yes)

1 ‘0’

tt_samp 0x0A[1:0]

number of data to be sampled after

wake-up

‘00’ => 2 data

‘01’ => 4 data

‘10’ => 8 data

‘11’ => 16 data

2 ‘00’

tt_first_x

tt_first_y

tt_first_z

whether x-axis has triggered the

interrupt (0=no, 1=yes)

whether y-axis has triggered the

interrupt (0=no, 1=yes)

whether z-axis has triggered the

interrupt (0=no, 1=yes)

3 “000”

tt_sign

give the slope sign of the triggering

signal (0=positive, 1=negative)

1 ‘0’

* For determining the corresponding I

C register address, please refer to figure 2 in chapter 4 (memory map)

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 62 63

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