BMA020 Bosch Sensortec, BMA020 Datasheet - Page 13

3-AXIS ACCELEROMETER DIGITAL I/F

BMA020

Manufacturer Part Number
BMA020
Description
3-AXIS ACCELEROMETER DIGITAL I/F
Manufacturer
Bosch Sensortec
Datasheet

Specifications of BMA020

Axis
X, Y, Z
Acceleration Range
± 2g, 4g, 8g
Sensitivity
256LSB/g, 128LSB/g, 64LSB/g
Voltage - Supply
2 V ~ 3.6 V
Output Type
Digital
Bandwidth
3kHz
Interface
I²C, SPI
Mounting Type
Surface Mount
Package / Case
12-LGA
For Use With
828-1014 - BMA020 TRIBOX DEMO BOARD W/USB828-1008 - BMA020 DAUGHTERCARD FOR DEV KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
828-1000-2

Available stocks

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Manufacturer
Quantity
Price
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BOSCH/博世
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Company:
Part Number:
BMA020
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Data sheet
BMA020
Bosch Sensortec
Digital, triaxial acceleration sensor
3.2 Interrupt settings
Five different types of interrupts can be programmed. When the corresponding criterion
becomes valid, the interrupt pin is triggered to a high level. All interrupt criteria are combined
and drive the interrupt pad with a Boolean <OR> condition.
Interrupt generations may be disturbed by changes of control bits because some of these bits
influence the interrupt calculation. As a consequence, no write sequence should occur when
microprocessor is triggered by interrupt or the interrupt should be deactivated on the
microprocessor side when write sequences are operated.
Interrupt criteria are using digital code coming from digital filter output. As a consequence all
thresholds are scaled with range selection (section 3.1.3.2). Timings used for high acceleration
and low acceleration debouncing are absolute values (1 LSB of HG_dur and LG_dur registers
corresponds to 1 millisecond, timing accuracy is proportional to oscillator accuracy = +/-10%),
thus it does not depend on selected bandwidth. Timings used for any motion interrupt and alert
detection are proportional to bandwidth settings (section 3.1.3).
3.2.1 Enable_LG
This bit (address 0Bh, bit 0) enables the LG_thres criteria to generate an interrupt.
3.2.2 Enable_HG
This bit (address 0Bh, bit 1) enables the HG_thres criteria to generate an interrupt.
3.2.3 Enable_adv_INT
This bit (address 15h, bit 6) is used to disable advanced interrupt control bits (any_motion,
alert). If enable_adv_INT=0, writing to these bits has no effect on sensor IC function.
3.2.4 Any_motion
This bit ((address 0Bh, bit 6)enables the any motion criteria to generate directly an interrupt. It
can not be turned on simultaneously with alert. This bit can be masked by enable_ adv_INT, the
value of this bit is ignored when enable_adv_INT=0 (section 3.2.3).
3.2.5 Alert
If this bit (address 0Bh, bit 7) is at 1, the any_motion criterion will set BMA020 into alert mode
(section 3.2.9). This bit can be masked by enable_adv_INT, the value of this bit is ignored when
enable_adv_INT=0 (section 3.2.3).
Rev. 1.2
Page 13
30 May 2008
© 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.

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