BMA020 Bosch Sensortec, BMA020 Datasheet - Page 43

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

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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 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. BMA020 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 30msec. until normal
operation has resumed.
The current consumption in sleep mode is 1µA.
7.3 Wake-up mode
In general BMA020 is attributed to low power applications and can contribute to the system
power management.
The BMA020 provides the possibility to wake up a system master when specific acceleration
values are detected. Therefore the BMA020 stays in an ultra low power mode and periodically
evaluates the acceleration data with respect to interrupt criteria defined by the user. An interrupt
Rev. 1.2
© 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
Current consumption in wake-up mode
mode
to
Digital, triaxial acceleration sensor
trigger
a
Data sheet
BMA020
Page 43
system
wake-up
(interrupt
output
Bosch Sensortec
30 May 2008
to
master)

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