BMA253
Data sheet
Page 14
4.2 Power modes
The BMA253 has six different power modes. Besides normal mode, which represents the fully
operational state of the device, there are five energy saving modes: deep-suspend mode,
suspend mode, standby mode, low-power mode 1 and low-power mode 2.
The possible transitions between the power modes are illustrated in figure 2:
DEEP-
SUSPEND
Mode
NORMAL
Mode
STANDBY
Mode
SUSPEND
Mode
Low Power
Mode 1
Low Power
Mode 2
Figure 2: Power mode transition diagram
After power-up BMA253 is in normal mode so that all parts of the device are held powered-up
and data acquisition is performed continuously.
In deep-suspend mode the device reaches the lowest possible power consumption. Only the
interface section is kept alive. No data acquisition is performed and the content of the
configuration registers is lost. Deep suspend mode is entered (left) by writing ‘1’ (‘0’) to the
(0x11) deep_suspend bit while (0x11) suspend bit is set to ‘0’. The I2C watchdog timer remains
functional. The (0x11) deep_ suspend bit, the (0x34) spi3 bit, (0x34) i2c_wdt_en bit and the
(0x34) i2c_wdt_sel bit are functional in deep-suspend mode. Equally the interrupt level and
driver configuration registers (0x20) int1_lvl, (0x20) int1_od, (0x20) int2_lvl, and (0x20) int2_od
are accessible. Still it is possible to enter normal mode by performing a softreset as described in
chapter 4.8. Please note, that all application specific settings which are not equal to the default
settings (refer to 6.2 register map), must be re-set to its designated values after leaving deep-
suspend mode.
BST-BMA253-DS000-01 | Revision 1.0 | August 2015
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.
BOSCH [ Bosch Sensortec GmbH ]
