BMA250 Bosch Sensortec, BMA250 Datasheet - Page 23

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

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

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
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
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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.
latch_int
(0x21)
0000b
0001b
0010b
0011b
0100b
0101b
0110b
0111b
1000b
1001b
1010b
1011b
1100b
1101b
1110b
1111b
Table 14: Interrupt mode selection
Page 23 / not for publishing
Data sheet
BMA250
temporary, 12.5ms
temporary, 250ms
temporary, 500ms
temporary, 500μs
temporary, 500μs
temporary, 25ms
temporary, 50ms
Interrupt mode
temporary, 1ms
temporary, 1s
temporary, 2s
temporary, 4s
temporary, 8s
non-latched
non-latched
latched
latched
Bosch Sensortec
03 March 2011