PAW3602DH Datasheet, PDF (16/32 Pages) Pixart Imaging Inc. – CMOS LASER MOUSE SENSOR

PixArt Imaging Inc.
PAW3602DH
CMOS Laser Mouse Sensor
7.2.1 Re-Synchronous Serial Interface Using PD Pin
The mouse controller raises PD line to reach re-synchronous serial interface after an incorrect read. The mouse
sensor will reset the serial port but will not reset the registers and be prepared for the beginning of a new
transmission. Note that using “PD pin” to reach re-synchronous is quicker than using “watchdog timer timeout”.
PD
1us,min
SCLK
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2
1
3
1
4
1
5
1
6
SDIO
Hi-Z
ADDRESS(R/W)
DATA
Figure 10. Re-synchronous Serial Interface Using PD Pin
7.2.2 Re-Synchronous Serial Interface Using Watchdog Timer Timeout
The mouse controller can toggle the SCLK line from high to low to high and wait at least t_SIWTT to reach re-
synchronous serial interface after an incorrect read. The mouse sensor will reset the serial port but will not reset
the registers and be prepared for the beginning of a new transmission.
t_{S IW TT}
SCLK
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2
1
3
1
4
1
5
1
6
SD IO
t_{R E S Y N C}
1us, m in
H i-Z
ADDR ESS (R/W )
DATA
Figure 11. Re-synchronous Serial Interface Using Watchdog Timer Timeout
7.3 Collision Detection on SDIO
The only time that the mouse sensor drives the SDIO line is during a READ operation. To avoid data collisions,
the micro-controller should release SDIO before the falling edge of SCLK after the last address bit. The mouse
sensor begins to drive SDIO after the next falling edge of SCLK. The mouse sensor release SDIO of the rising
SCLK edge after the last data bit. The micro-controller can begin driving SDIO any time after that. In order to
maintain low power consumption in normal operation or when the PD pin is pulled high, the micro-controller
should not leave SDIO floating until the next transmission (although that will not cause any communication
difficulties).
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PixArt Imaging Inc.
E-mail: [e-mail]
V1.0, Jun. 2007