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 23/74

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All time constants are based upon the typical frequency of the internal oscillator. This is
reflected by the bandwidths (bw) as specified in table 1.
4.8.1 General features
An interrupt is cleared depending on the selected interrupt mode, which is common to all
interrupts. There are three different interrupt modes: non-latched, latched, and temporary. The
mode is selected by the (0x21) latch_int bits according to table 14
(0x21)
latch_int
An interrupt is generated if its activation condition is met. It can not be cleared as long as the
activation condition is fulfilled. In the non-latched mode the interrupt status bit and the selected
pin (the contribution to the ´or´ condition for INT1 and/or INT2) are cleared as soon as the
activation condition is no more valid. Exceptions to this behaviour are the new data, orientation,
and flat interrupts, which are automatically reset after a fixed time.
In the latched mode an asserted interrupt status and the selected pin are cleared by writing ´1´
to bit (0x21) reset_int. If the activation condition still holds when it is cleared, the interrupt status
is asserted again with the next change of the acceleration registers.
In the temporary mode an asserted interrupt and selected pin are cleared after a defined period
of time. The behaviour of the different interrupt modes is shown graphically in figure 5:
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
Table 14: Interrupt mode selection
Interrupt mode
0000b
non-latched
0001b
temporary, 250ms
0010b
temporary, 500ms
0011b
temporary, 1s
0100b
temporary, 2s
0101b
temporary, 4s
0110b
temporary, 8s
0111b
latched
1000b
non-latched
1001b
temporary, 500μs
1010b
temporary, 500μs
1011b
temporary, 1ms
1100b
temporary, 12.5ms
1101b
temporary, 25ms
1110b
temporary, 50ms
1111b
latched
Page 23 / not for publishing
Bosch Sensortec
03 March 2011