BMC150 datasheet(21/141 Pages) ETC2

21 / 141 page

Datasheet

eCompass BMC150

Page 21

Confidential

BST-BMC150-DS000-03 | Revision 0.4 | February 2013

Bosch Sensortec

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

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:

active

sleep

active

DDsum

sleep

DDlp











active

sleep

active

DDsbm

sleep

DDlp











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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