MC3630 Datasheet, PDF (25/83 Pages) –

MC3630 3-Axis Accelerometer
Preliminary Datasheet
Operational Modes
The device has various modes of operation as described below:
Mode
Description and Comments
SLEEP
SLEEP is the lowest power mode. The internal regulators are enabled and
much of the chip is disabled. The SLEEP mode is the default POR mode.
This command is available at any time, although up to three periods of the
internal heartbeat clock may be required to complete the transition.
STANDBY
STANDBY is a low power mode. All internal regulators are enabled with
internal main and heartbeat clocks enabled. The default STANDBY
frequency for the heartbeat clock is ~500 Hz. TRIG mode operation can be
executed only from this mode.
Software must change the mode to SLEEP or STANDBY by writing 0x1
into register 0x10[2:0] before writing to any other register.
SNIFF
SNIFF is a lower power, limited activity detection mode; Sniff circuitry is
enabled and sniff-only sampling is enabled. There are no FIFO operations,
and hardware will automatically transition to CWAKE mode upon activity
detection.
CWAKE
CWAKE or continuous wake is the typical XYZ sampling mode. Sample data
is written to the output registers, or the FIFO when enabled. Hardware will
automatically transition to CWAKE mode upon SNIFF activity detection.
SWAKE
SNIFF and CWAKE circuitry are both active simultaneously. Sniff circuitry is
enabled and XYZ samples are written to the output registers, or the FIFO
when enabled.
TRIG
The device produces a fixed number of samples, between 1 and 254, or
continuously. This mode ignores the setting in the ODR, but uses the
STB_RATE[2:0] clock setting in register 0x12[7:5] as the sampling rate. The
trigger can be set to come from the external pin INTN or a write to register bit
0x10[7].
Table 10. Operational Modes
mCube Proprietary
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APS-048-0047v1.2
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