BMA220 datasheet(34/60 Pages) BOSCH

34 / 60 page

BMA220

Data sheet

Bosch Sensortec

Rev. 1.10

Page 34

13 April 2011

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. Document is not intended for publication.

6.3 Low-power mode and suspend mode

The BMA220 is optimized for low power consumption. Note: Simply switching-off of the power

supplies (VDDD and/or VDDA) is not a defined low-power mode.

The deactivation of VDDD while VDDA is active (or vice versa) is not recommended for permanent

operation. With respect to the application it might be useful to switch-off VDDIO while VDDD and

VDDA are active. This condition is supported and will lead to a reduction of current consumption.

The sensor register map will be reset.

To reduce current consumption in a defined way, the BMA220 supports two energy saving

modes: a suspend mode and a low-power mode.

During normal mode operation, all analog modules are held powered-up and the clock for all

digital modules is active. During low-power mode, the analog modules in the rate channel are

held powered down and the clock of the digital rate, filter and trimming modules is gated. The

average typical current consumption during sleep phase (ilow_power_mode) can be estimated by the

following equation:

First approximation: isleep = isuspend

Ø typ.

awake

sleep

active

suspend

sleep

power

low











mod

For sleep phase time setting (tsleep) refer to chapter 4.1.2 table 3.

For approximate awake phase time (tawake) refer to chapter 4.1.3 table 4.

For current consumption in normal mode (iactive) refer to chapter 1.

For current consumption in suspend mode (isuspend) refer to chapter 1.

Example: Bandwidth (BW) = 1kHz, nominal supplies

 resulting awake phase for 1st data sample (tawake) = 1190μs = 1.190ms

 resulting sleep time (tsleep) = 50 ms

Ø typ.

µA

awake

sleep

active

suspend

sleep

power

low

190

250

190

mod























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