PAW3601DH Datasheet, PDF (19/35 Pages) Pixart Imaging Inc. – laser diode form a complete and compact laser mouse tracking system

PixArt Imaging Inc.
PAW3601DH
CMOS Laser Mouse Sensor
7.3 Full Chip Reset
To place the SDIO pin into the Hi-Z state, first raise the PD line, toggle the SCLK line from high to low to high
and then fall the PD line. The mouse sensor will reset the serial port, the registers, and then be prepared for the
beginning of a new transmission.
VDD
PD
SCLK
SD IO
1us,m in
H i-Z
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2
1
3
1
4
1
5
1
6
ADDRESS(R/W )
DATA
Figure 14. Soft Reset the Mouse Sensor (Reset Full Chip and SDIO Line Set to Hi-Z State)
7.4 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 mouse 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 mouse 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 mouse controller
should not leave SDIO floating until the next transmission (although that will not cause any communication
difficulties).
7.5 Power Down Mode
There are two different ways to entry power down mode, using the PD line (see Section 7.5.1) or register setting
(see Section 7.5.2).
7.5.1 PD Line Power Down Mode
To place the mouse sensor in a low power mode to meet USB suspend specification, raises the PD line at least
700us. Then PD line can stay high, with the mouse sensor in the shutdown state, or the PD pin can be lowered,
returning the mouse sensor to normal operation.
PD
t_PDW
700us,min
IDD
t_PD
500us
500us
90frames
t_PUPD
14.15ms
Figure 15. Power Down Minimum Pulse Width
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PixArt Imaging Inc.
E-mail: [e-mail]
V2.2, Aug. 2007