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 15/74

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Table 6: Sleep phase duration settings
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
, has to be considered. Therefore, t
w_up
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.
BMA250
Data sheet
(0x11)
Sleep Phase
sleep_dur
Duration
t
sleep
0000b
0.5ms
0001b
0.5ms
0010b
0.5ms
0011b
0.5ms
0100b
0.5ms
0101b
0.5ms
0110b
1ms
0111b
2ms
1000b
4ms
1001b
6ms
1010b
10ms
1011b
25ms
1100b
50ms
1101b
100ms
1110b
500ms
1111b
1s
t
I
sleep
DDsm
I
DDlp
t
sleep
= t
+ t
, where t
active
ut
w_up
Page 15 / not for publishing
Bosch Sensortec
t
I
active
DD
.
t
active
, the wake-up time,
active
is given in table 8. During the
ut
for the different sleep
DDlpe
03 March 2011