BMA220 datasheet(29/60 Pages) BOSCH

29 / 60 page

BMA220

Data sheet

Bosch Sensortec

Rev. 1.10

Page 29

13 April 2011

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

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.

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_NUM

HIGH_TH_INIT

“1110”

high_hy

0x05[7:6] define the high-g hysteresis level

1 LSB is 2*(LSB of acc_data)

HIGH_HY_NUM

HIGH_HY_INIT

“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_NUM

HIGH_DUR_INIT

“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)

“000”

high_int

0x0C.2

whether high-g interrupt has been

triggered (0=no, 1=yes)

‘0’

high_first_

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)

“000”

high_sign

give the slope sign of the triggering

signal (0=positive, 1=negative)

‘0’

* For determining the corresponding I

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

Table 13: Control and status register for high g detection

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