AT89RFD-11 User Guide
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7648A–USB–06/06
3.6.4.1
Motion Pin Timing
The motion pin is a level-sensitive output that signals the microcontroller when motion
has occurred. The Motion pin is lowered whenever the Motion bit is set; in other words,
whenever there is data in the Delta_X or Delta_Y registers. Clearing the Motion bit (by
reading Delta_Y
and Delta_X, or writing to the Motion register) will set the Motion pin
high. This feature further contributes to the system power saving. As long as the ADNS-
3030 is not sensing motion the microcontroller can enter its own sleep mode as long as
it is capable of waking up from an interrupt by the Motion pin.
3.6.4.2
LED Mode
For power savings, the LED will not be continuously on. ADNS-3030 will flash the LED
only when needed. This is fully automated and managed by the ADNS-3030. As a result
the ADNS-3030 consumes only about 4 mA of average current while in the active mode.
Parameter
Symbol
Minumum
Typical
Maximum
Units
Notes
DC Supply
IDD
3.9
13
mA
Average current,including
LED current.
No load on MISO,
MOTION.
Current In
0.63
2.3
Various
0.13
0.5
Modes
0.032
0.15
