4
Modes of Operation
SLEEP
ACTIVE
OFF
STANDBY
WAKE
Figure 6. MMA8452Q Mode Transition Diagram
Table 7. Mode of Operation Description
Mode
OFF
STANDBY
ACTIVE
(WAKE/SLEEP)
I 2 C Bus State
Powered Down
I 2 C communication with
MMA8452Q is possible
I 2 C communication with
MMA8452Q is possible
VDD
<1.8V
ON
ON
VDDIO
VDDIO Can be > VDD
VDDIO = High
VDD = High
ACTIVE bit is cleared
VDDIO = High
VDD = High
ACTIVE bit is set
Function Description
The device is powered off. All analog and digital blocks
are shutdown. I 2 C bus inhibited.
Only digital blocks are enabled.
Analog subsystem is disabled. Internal clocks disabled.
All blocks are enabled (digital, analog).
All register contents are preserved when transitioning from ACTIVE to STANDBY mode. Some registers are reset when
transitioning from STANDBY to ACTIVE. These are all noted in the device memory map register table. The SLEEP and WAKE
modes are ACTIVE modes. For more information on how to use the SLEEP and WAKE modes and how to transition between
these modes, please refer to the functionality section of this document.
MMA8452Q
Sensors
10
Freescale Semiconductor, Inc.
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