3-AXIS ACCELEROMETER DIGITAL I/F

BMA250

Manufacturer Part NumberBMA250
Description3-AXIS ACCELEROMETER DIGITAL I/F
ManufacturerBosch Sensortec
Series-
BMA250 datasheets
 

Specifications of BMA250

Featured ProductBMA250 - Digital, Triaxial Acceleration SensorAxisX, Y, Z
Acceleration Range±2g, 4g, 8g, 16gSensitivity256LSB/g, 128LSB/g, 64LSB/g, 16LSB/g
Voltage - Supply1.62 V ~ 3.6 VOutput TypeI²C™, SPI™
Bandwidth8Hz ~ 1kHzInterfaceI²C, SPI
Mounting TypeSurface MountPackage / Case12-VQFN
Lead Free Status / Rohs StatusLead free / RoHS CompliantFor Use With828-1024 - BMA250 DAUGHTERCARD FOR DEV KIT
Other names828-1023-2  
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Page 10/74

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3. Block diagram
Figure 1 shows the basic building blocks of the BMA250:
4. Functional description
Note: Default values for registers can be found in chapter 5.
4.1 Power management
The BMA250 has two distinct power supply pins:
• V
is the main power supply for all internal analog and digital functional blocks;
DD
• V
is a separate power supply pin, exclusively used for the supply of the digital interface.
DDIO
There are no limitations on the voltage levels of both pins relative to each other, as long as each
of them lies within its operating range. Furthermore, the device can be completely switched off
(V
= 0V) while keeping the V
DD
(V
= 0V) and keep the internal supply on (V
DDIO
device is in low-power mode or suspend mode while V
consumption on the V
supply (non-destructive).
DD
It is absolutely prohibited to keep any interface at a logical high level when V
Such a configuration will permanently damage the device (i.e. if V
& CSB] ≠ high).
The device contains a power-on reset (POR) generator. It resets the logic part and the register
values after powering-on V
DD
Rev. 1.0
© 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.
BMA250
Data sheet
Figure 1: Block diagram of BMA250
supply on (V
> 0V). To switch off the interface supply
DDIO
DDIO
> 0V) is safe only in normal mode. If the
DD
DDIO
and V
. There is no limitation on the sequence of switching on
DDIO
Page 10 / not for publishing
Bosch Sensortec
= 0V, there is a risk of excess current
is switched off.
DDIO
= 0  [SDI & SDO & SCK
DDIO
03 March 2011