PAW3212DB-TJDT Datasheet, PDF (18/31 Pages) Pixart Imaging Inc. – ULTRA LOW POWER WIRELESS MOUSE SENSOR

PAW3212DB-TJDT
11. MOTION Pin Function
The MOTION pin will go from high to low or keep low whenever the sensor detects the occurrence of motion. The MOTION pin can be used
to monitor whether if the sensor motion data has been cleared. If the motion data is not cleared, MOTION pin will remain low. After all the
motion data is read out by the host controller (i.e. Motion bit, Delta_X and Delta_Y are all zero), the MOTION pin will go high. When a mouse
system is working at an idle state where the sensor is at Sleep1/Sleep2/Sleep3 mode and the host controller is at idle mode, and when the
sensor detects the occurrence of motion, the MOTION pin will go low. The falling edge on MOTION pin can be used as an interrupt event to
wake up the host controller.
Figure 20. Motion Function
12. Power Management Modes
The sensor has three power-saving modes (Sleep1, Sleep2 and Sleep3). Each mode has a different motion detection period to detect the
motion periodically. When left idle, the sensor automatically changes from Run mode to Sleep1 mode, to Sleep2 mode and finally to Sleep3
mode which consumes the least current. Be noticed that the current consumption is the lowest at Sleep3 mode and highest at Sleep1 mode,
however the time required for the sensor to “wake up” to Run mode from Sleep1 mode is the shortest and longest from Sleep3 mode. The
entering time (Slp1_Etm, Slp2_Etm, Slp3_Etm) is the elapsed time from the time when the sensor is idle to Sleep modes. The sampling
frequency time (Slp1_Freq, Slp2_Freq, Slp3_Freq) is the time period to detect the motion under Sleep modes. The relationship between the
entering time and the sampling frequency time is shown in figure below.
Figure 21. Power-Saving Modes
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