BMA250 Bosch Sensortec, BMA250 Datasheet - Page 15

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

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The current consumption of the BMA250 can be calculated according to this formula:
When making an estimation about the length of the wake-up phase t
t
wake-up phase all analog modules are held powered-up, while during the sleep phase most
analog modules are powered down. As a consequence, a wake-up time of less than 1ms (typ.
value 0.8ms) is needed to settle the analog modules in order to get reliable acceleration data.
Table 7 gives an overview of the resulting average supply currents I
phase durations and a selected bandwidth of 1000Hz, assuming no interrupt is active and thus
only one sample per wake-up phase is taken:
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.
w_up
, has to be considered. Therefore, t
Table 6: Sleep phase duration settings
sleep_dur
(0x11)
0000b
0001b
0010b
0011b
0100b
0101b
0110b
0111b
1000b
1001b
1010b
1011b
1100b
1101b
1110b
1111b
Page 15 / not for publishing
active
Data sheet
BMA250
I
= t
DDlp
Sleep Phase
ut
Duration
+ t
100ms
500ms
0.5ms
0.5ms
0.5ms
0.5ms
0.5ms
0.5ms
10ms
25ms
50ms
t
1ms
2ms
4ms
6ms
t
sleep
1s
w_up
sleep
, where t
I
t
sleep
DDsm
t
t
active
ut
active
is given in table 8. During the
DDlpe
I
DD
active
.
for the different sleep
, the wake-up time,
Bosch Sensortec
03 March 2011

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