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BMC150 Datasheet(PDF) 21 Page - Bosch Sensortec GmbH |
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BMC150 Datasheet(HTML) 21 Page - Bosch Sensortec GmbH |
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21 / 142 page  Datasheet eCompass BMC150 Page 21 BST-BMC150-DS000-04 | Revision 1.0 | July 2014 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 estimated with 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 – 0.9 ms (or tactive = tut + tw,up2 – 0.9 ms) else: tactive = 4 tut + tw,up1 – 0.9 ms (or tactive = 4 tut + tw,up2 – 0.9 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 at least tw,up1 (tw,up2) is needed to settle the analog modules so that reliable acceleration data are generated. |
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