BMA150 Bosch Sensortec, BMA150 Datasheet - Page 14

• Manufacturer Part Number: BMA150
• Description: 3-AXIS ACCELEROMETER DIGITAL I/F
• Manufacturer: Bosch Sensortec

Specifications of BMA150

• Axis: X, Y, Z
• Acceleration Range: ± 2g, 4g, 8g
• Sensitivity: 256LSB/g, 128LSB/g, 64LSB/g
• Voltage - Supply: 2.4 V ~ 3.6 V
• Output Type: Digital
• Bandwidth: 3kHz
• Interface: I²C, SPI
• Mounting Type: Surface Mount
• Package / Case: 12-LGA
• For Use With: DM180021 - KIT STARTER MPLAB FOR PIC18F MCU828-1013 - BMA150 TRIBOX DEMO BOARD W/USB828-1009 - BMA150 DAUGHTERCARD FOR DEV KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 0273 141 043; 828-1003-2

Data sheet
BMA150
Bosch Sensortec
Triaxial, digital 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 an Boolean <OR> condition.
Interrupt generations may be disturbed by changes of EEPROM, image or other 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, timiming 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 BMA150 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. 1.6
Page 14
30 October 2008
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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.