Bosch MAN-REG-X-08 Especificaciones descargar pdf (Pagina 29)

Data sheet

BMA220

Page 29

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.

5.8 High-g detection

For indicating high-g events, an upper threshold can be programmed. The threshold high_th,

the hysteresis high_hy and the duration high_dur are defined analogously to the low-g interrupt.

The interrupt is generated if one of the three channels exceeds the threshold hight_th and does

not fall below hysteresis level high_th-high_hy for minimum number of data points (high_dur).

When the high-g interrupt is triggered, the signals of the axis that has triggered the interrupt

(high_first_x, high_first_y, high_first_z) and the signal of motion direction (high_sign) will be

stored in the corresponding status registers.

Table 13: Control and status register for high-g detection

Name

address

(SPI) *

Description Number of bits Reset-value

high_th 0x06[3:0]

define the high-g threshold

level

1 LSB is 2*(LSB of acc_data)

HIGH_TH_NU

HIGH_TH_INI

“1110”

high_hy 0x05[7:6]

define the high-g hysteresis

level

1 LSB is 2*(LSB of acc_data)

HIGH_HY_NU

HIGH_HY_INI

“01”

high_dur 0x05[5:0]

define the number of

measured signals which has

to be higher than

high_th+high_hy to set the

interrupt (max. 64)

HIGH_DUR_N

HIGH_DUR_I

NIT

“011111” (3F)

en_high_x

en_high_y

en_high_z

0x0E.2

0x0E.1

0x0E.0

enable high-g detection on x-

axis (0=disabled, 1=enabled)

enable high-g detection on x-

axis (0=disabled, 1=enabled)

enable high-g detection on x-

axis (0=disabled, 1=enabled)

3 “000”

high_int 0x0C.2

whether high-g interrupt has

been triggered (0=no, 1=yes)

1 ‘0’

high_first_x

high_first_y

high_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”

high_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 ... 24 25 26 27 28 29 30 31 32 33 34 ... 62 63

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