PAW3603DH-NF Datasheet, PDF (18/32 Pages) Pixart Imaging Inc. – LOW POWER WIRELESS LASER MOUSE SENSOR

PixArt Imaging Inc.
PAW3603DH-NF
CMOS Laser Mouse Sensor
z Power On Problem - The problem occurs if the mouse sensor powers up before the mouse controller
sets the SCLK and SDIO lines to be output. The mouse sensor and the mouse controller might get out
of synchronization due to power on problem. An easy way to solve this is to use “watchdog timer
timeout”.
z ESD Events - The mouse sensor and the mouse controller might get out of synchronization due to ESD
events. An easy way to solve this is to use “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 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 releases 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).
7.4 Power Down Mode
There are two different ways to entry power down mode, using the PD line (see Section 7.4.1) or register setting
(see Section 7.4.2).
7.4.1 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
t_PDW. 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.
Figure 13. Power Down Minimum Pulse Width
Figure 14. PD Line Power Down Mode
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PixArt Imaging Inc.
E-mail: [e-mail]
V1.0, Aug. 2007