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BMC150 데이터시트(PDF) 21 Page - List of Unclassifed Manufacturers

부품명 BMC150
상세설명  6-axis eCompass
PDF  141 Pages
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BMC150 데이터시트(HTML) 21 Page - List of Unclassifed Manufacturers

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Datasheet
eCompass BMC150
Page 21
Confidential
BST-BMC150-DS000-03 | Revision 0.4 | February 2013
Bosch Sensortec
© 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. Not intended for publication.
The sleep time for lower-power mode 1 and 2 is set by the (0x11) sleep_dur bits as shown in
the following table:
Table 5: Sleep phase duration settings
(0x11) sleep_dur
Sleep Phase Duration
tSLEEP,a
0000b
0.5ms
0001b
0.5ms
0010b
0.5ms
0011b
0.5ms
0100b
0.5ms
0101b
0.5ms
0110b
1ms
0111b
2ms
1000b
4ms
1001b
6ms
1010b
10ms
1011b
25ms
1100b
50ms
1101b
100ms
1110b
500ms
1111b
1s
The current consumption of the BMC150 accelerometer part in low-power mode 1 (IDDlp1) and
low-power mode 2 (IDDlp2) can be calculated according to the following formulae:
a
active
a
sleep
a
DD
a
active
a
DDsum
a
sleep
a
DDlp
t
t
I
t
I
t
I
,
,
,
,
,
,
,
1
a
active
a
sleep
a
DD
a
active
a
DDsbm
a
sleep
a
DDlp
t
t
I
t
I
t
I
,
,
,
,
,
,
,
2
When estimating the length of the wake-up phase tactive, the corresponding typical wake-up time,
tw,up1 or tw,up2 and tut (given in table 5) have to be considered:
If bandwidth is >=31.25 Hz:
tactive = tut + tw,up1 – 0.5 ms (or tactive = tut + tw,up2 – 0.5 ms)
else:
tactive = 4 tut + tw,up1 – 0.5 ms (or tactive = 4 tut + tw,up2 – 0.5 ms)
During the wake-up phase all analog modules are held powered-up, while during the sleep
phase most analog modules are powered down. Consequently, a wake-up time of more than
tw,up1 (tw,up2) is needed to settle the analog modules so that reliable acceleration data are
generated.



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