BMA250 Bosch Sensortec, BMA250 Datasheet - Page 24

• 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

BMA250
Bosch Sensortec
Data sheet
Figure 5: Interrupt modes
Several interrupt engines can use either unfiltered or filtered acceleration data as their input. For
these interrupts, the source can be selected with the respective (0x1E) int_src_... bits, in details
these are (0x1E) int_src_data, (0x1E) int_src_tap, (0x1E) int_src_slope, (0x1E ) int_src_high,
and (0x1E) int_src_low. Setting the respective bits to ´0´ (´1´) selects filtered (unfiltered) data as
input. For the other interrupts, orientation recognition and flat detection, such a selection is not
possible. They always use filtered input data.
It is strongly recommended to set interrupt parameters prior to enabling the interrupt. Changing
parameters of an already enabled interrupt may cause unwanted interrupt generation and
generation of a false interrupt history. A safe way to change parameters of an enabled interrupt
is to keep the following sequence: disable the desired interrupt, change parameters, wait for at
least 600 s, enable the desired interrupt.
4.8.2 Mapping (inttype to INT Pin#)
The mapping of interrupts to the interrupt pins #05 or #06 is done by registers (0x19) to (0x1B).
Setting (0x19)
int1_”inttyp”
to ´1´ (´0´) maps (unmaps)
“inttyp”
to pin #5 (INT1), correspondingly
setting (0x1B)
int2_”inttyp”
to ´1´ (´0´) maps (unmaps)
“inttyp”
to pin #6 (INT2).
Note:
“inttyp”
to be replaced with the precise notation, given in the memory map in chapter 5.
Example: For flat interrupt (int1_flat): Setting (0x19)
int1_flat
to ´1´ maps
int1_flat
to pin #5
(INT1).
4.8.3 Electrical behaviour (INT pin# to open-drive or push-pull)
Both interrupt pins can be configured to show desired electrical behaviour. The ´active´ level of
each pin is determined by the (0x20) int1_lvl and (0x20) int2_lvl bits.
If (0x20) int1_lvl = ´1´ (´0´) / (0x20) int2_lvl = ´1´ (´0´), then pin #05 (INT1) / pin #06 (INT2) is
active ´1´ (´0´). In addition to that, also the electric type of the interrupt pins can be selected. By
Rev. 1.0
Page 24 / not for publishing
03 March 2011
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Note: Specifications within this document are subject to change without notice.