MC3630 Datasheet, PDF (48/83 Pages) –

MC3630 3-Axis Accelerometer
Preliminary Datasheet
(0x10) Mode Control Register
This register is the primary control register for the accelerometer. The operational mode of the
device, X/Y/Z axis enables, and the TRIG one-shot mode can be written through this register.
The mode transitions controlled by this register may take up to 3 transitions of the heartbeat
clock. Depending on the operation, the lower 3-bits (MCTRL[2:0]) may be automatically set or
cleared by hardware if auto-triggered events are executed.
In general, when software sets an operational mode using the MCTRL [2:0] bits, there might
be a delay time of 2 to 10 mSec before the operational mode is reflected by the MODE[2:0]
bits in 0x08 Status Register 1.
Addr Name Description Bit 7 Bit 6 Bit 5 Bit 4
0x10
MODE_C
Mode Control
TRIG_ Z_AXIS_P Y_AXIS_P X_AXIS_
CMD
D
D
PD
Bit 3
RESV
Bit 2
Bit 1
Bit 0
POR
Value
R/W
MCTRL[2] MCTRL[1] MCTRL[0] 0x00 W
Bit
[2:0]
Name
MCTRL[2:0]
Bit Field
000
001
010
011
100
101
Description
Mode
Comments
SLEEP
Lowest power mode,
regulators on, no clock activity,
partial chip power-down.
STANDBY Low power mode, no
sampling, clocks active.
SNIFF
Sniff activity detection mode,
sniff enabled, no sampling, no
FIFO operations, automatically
transition to CWAKE mode
upon activity detection.
Reserved Reserved
Reserved Reserved
CWAKE
Continuous wake. Active XYZ
sampling. Sniff circuitry not
active.
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