BMA222 Bosch Sensortec, BMA222 Datasheet - Page 19

• Manufacturer Part Number: BMA222
• Description: 3-AXIS ACCELEROMETER DIGITAL SMD
• Manufacturer: Bosch Sensortec

Specifications of BMA222

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 828-1025-2

In dependence to the measurement range which has been set, the compensation value, which
has been written into the public register will correct the data output according to figure 4.
e.g. ±2g range:
public register = 00000001b  add to acceleration data = ±0mg
public register = 00000010b  add to acceleration data = +15.6mg
public register = 00000101b  add to acceleration data = +31.3mg
The public registers are image registers of EEPROM registers. With each image update (see
section 4.7 Non-volatile memory” for details) the contents of the non-volatile EEPROM registers
is written to the public registers. At any time the public register can be over-written by the user.
After changing the contents of the public registers by either an image update or manually, all
values are stored in the corresponding internal registers. In the opposite direction, if the value of
an internal register changes due to the computation performed by a compensation algorithm, it
is stored in the public register.
For slow and fast offset compensation, the compensation target can be chosen by setting the
bits (0x37) offset_target_x, (0x37) offset_target_y, and (0x37) offset_target_z according to table
11:
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.
bit_11
bit_10
bit_8
bit_7
bit_6
bit_5
bit_4
bit_3
bit_2
bit_1
bit_0
bit_9
offset_unfilt_x/y/z
offset_filt_x/y/z
public register
7.8mg (lsb)
sign (msb)
62.5mg
31.3mg
15.6mg
500mg
250mg
125mg
or
Figure 4: Principle of offset compensation
conversion
range
Data sheet
BMA222
Page 19
sign (msb)
62.5mg
31.3mg
15.6mg
±2g
500mg
250mg
125mg
sign (msb)
62.5mg
31.3mg
500mg
250mg
125mg
±4g
acceleration data
in range
add to
sign (msb)
62.5mg
500mg
250mg
125mg
±8g
= ±0LSB
= +1LSB
= +2LSB
Bosch Sensortec
sign (msb)
07 March 2011
±16g
500mg
250mg
125mg