BMA250 Bosch Sensortec, BMA250 Datasheet - Page 41
Manufacturer Part Number
3-AXIS ACCELEROMETER DIGITAL I/F
Specifications of BMA250
BMA250 - Digital, Triaxial Acceleration Sensor
X, Y, Z
±2g, 4g, 8g, 16g
256LSB/g, 128LSB/g, 64LSB/g, 16LSB/g
Voltage - Supply
1.62 V ~ 3.6 V
8Hz ~ 1kHz
Package / Case
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With
828-1024 - BMA250 DAUGHTERCARD FOR DEV KIT
5.7 g-range selection
Register (0x0F) contains the selection of the g-range. Proper settings for (0x0F) range are
´0011b´ (selects ±2g range), ´0101b´ (selects ±4g range), ´1000b´ (selects ±8g range), ´1100b´
(selects ±16g range). All other settings are irregular; if such a setting is used, ±2g range is
selected. Default value of (0x0F) range (after reset) is ´0011b´.
Table 35: g-range, register (0x0F)
Register (0x10) contains the selection of the bandwidth for filtered acceleration data. Settings
for (0x10) bw are ´00xxxb´ (bandwidth = 7.81 Hz), ´01000b´ (bandwidth = 7.81 Hz), ´01001b´
(bandwidth = 15.63 Hz), ´01010b´ (bandwidth = 31.25 Hz), ´01011b´ (bandwidth = 62.5 Hz),
´01100b´ (bandwidth = 125 Hz), ´01101b´ (bandwidth = 250 Hz), ´01110b´ (bandwidth = 500
Hz), ´01111b´ (bandwidth = 1000 Hz), ´1xxxxb´ (bandwidth = 1000 Hz). Default value of (0x10)
bw (after reset) is ´11111b´. It is recommended to actively use the range from ´01000b´ to
´01111b´ only in order to be compatible with future products.
Table 36: Bandwidths, register (0x10)
5.9 Power modes
Register (0x11) contains the configuration of the power modes. (0x11) suspend = ´1´ (´0´) sets
(resets) suspend mode; default value of (0x11) suspend is ´0´.
(0x11) lowpower_en = ´1´ (´0´) sets (resets) low-power mode, default value of (0x11)
lowpower_en is ´0´.
The settings for (0x11) sleep_dur are ´0000b´ to ´0101b´ (sleep phase duration = 0.5 ms),
´0110b´ (sleep phase duration = 1 ms), ´0111b´ (sleep phase duration = 2 ms), ´1000b´ (sleep
phase duration = 4 ms), ´1001b´ (sleep phase duration = 6 ms), ´1010b´ (sleep phase duration =
10 ms), ´1011b´ (sleep phase duration = 25 ms), ´1100b´ (sleep phase duration = 50 ms),
´1101b´ (sleep phase duration = 100 ms), ´1110b´ (sleep phase duration = 500 ms), ´1111b´
(sleep phase duration = 1 s). Default value of (0x11) sleep_dur is ´0000b´.
Table 37: Power modes, register (0x11)
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Note: Specifications within this document are subject to change without notice.
Page 41 / not for publishing
03 March 2011