BMA150 Bosch Sensortec, BMA150 Datasheet - Page 46

• 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

7. Operation modes
7.1 Normal operational mode
In normal operational mode the sensor IC can be addressed via digital interface. Data and
status registers can be read out and control registers and EEPROM values can be read and
changed. In parallel to normal operation the user has the option to activate several internal logic
paths and set criteria to trigger the interrupt pin. BMA150 is designed to enable low current
consumption of 200µA in operational mode.
A self-test procedure can be started in operational mode for testing of the complete signal
evaluation path including the micro-machined sensor IC structure, the evaluation ASIC and the
physical connection to the host system.
7.2 Sleep mode
Sleep mode is activated by setting a control bit. In sleep mode no communication with the
sensor IC is possible – all read and write commands are forbidden. The recommended
command to switch to operational mode is the wake-up call.
Wake-up time from sleep to operational mode is 1ms.
In case of a soft-reset, it is recommended to do this reset after having switched from sleep to
operational mode. In this case the total typical wake-up and reset time at maximum bandwidth is
"switching to operational mode = 1ms" and "time after soft reset until acceleration data is
available = 1.3ms", i.e. 2.3ms in total.
In case a soft-reset is activated during sleep mode it can take up to 30ms until normal operation
has resumed.
The current consumption in sleep mode is 1µA.
7.3 Wake-up mode
In general BMA150 is attributed to low power applications and can contribute to the system
power management.
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The BMA150 provides the possibility to wake up a system master when specific acceleration
values are detected. Therefore the BMA150 stays in an ultra low power mode and periodically
Rev. 1.6
© 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.
Current consumption 200µA operational
Current consumption 1µA sleep mode
Wake-up time 1ms
Start-up time 3ms
Data ready indicator to reduce unnecessary interface communication
Wake-up
when motion detected
Low current consumption in wake-up mode
mode
to
Triaxial, digital acceleration sensor
trigger
a
Data sheet
BMA150
Page 46
system
wake-up
(interrupt
output
Bosch Sensortec
30 October 2008
to
master)