BMA250 Bosch Sensortec, BMA250 Datasheet - Page 10

3-AXIS ACCELEROMETER DIGITAL I/F

BMA250

Manufacturer Part Number
BMA250
Description
3-AXIS ACCELEROMETER DIGITAL I/F
Manufacturer
Bosch Sensortec
Series
-r
Datasheets

Specifications of BMA250

Featured Product
BMA250 - Digital, Triaxial Acceleration Sensor
Axis
X, Y, Z
Acceleration Range
±2g, 4g, 8g, 16g
Sensitivity
256LSB/g, 128LSB/g, 64LSB/g, 16LSB/g
Voltage - Supply
1.62 V ~ 3.6 V
Output Type
I²C™, SPI™
Bandwidth
8Hz ~ 1kHz
Interface
I²C, SPI
Mounting Type
Surface Mount
Package / Case
12-VQFN
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With
828-1024 - BMA250 DAUGHTERCARD FOR DEV KIT
Other names
828-1023-2
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

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