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PAN3201DH Datasheet(PDF) 16 Page - Pixart Imaging Inc.

Part No. PAN3201DH
Description  LOW POWER CMOS OPTICAL MOUSE SENSOR
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Maker  PIXART [Pixart Imaging Inc.]
Homepage  http://www.pixart.com.tw
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PAN3201DH Datasheet(HTML) 16 Page - Pixart Imaging Inc.

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PixArt Imaging Inc.
PAN3201DH
CMOS Optical Mouse Sensor
All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission
.
16
PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
V1.0, Mar. 2006
6.2.1 USB Suspend
Termination of a transmission by the micro-controller may sometimes be required (for example, due to a USB
suspend interrupt during a read operation). To accomplish this, the micro-controller should raise PD. The
PAN3201DH will not write to any register and will reset the serial port (but nothing else) and be prepared for
the beginning of future transmissions after PD goes low.
6.2.2 Firmware Flaws Error, or Others Error
The PAN3201DH and the micro-controller might get out of synchronization due to micro-controller firmware
flaws. The PD pin can stay high, with the PAN3201DH in the shutdown state, or the PD pin can be lowered,
returning the PAN3201DH to normal operation.
If the microprocessor and the PAN3201DH get out of sync, then the data either written or read from the
registers will be incorrect. In such a case, an easy way to solve this is to raise PD to re-sync the parts after an
incorrect read. The PAN3201DH will reset the serial port but will not reset the registers and be prepared for the
beginning of a new transmission.
6.2.3 Power On Problem
The problem occurs if the PAN3201DH powers up before the microprocessor sets the SCLK and SDIO lines to
be output.
6.3 Collision Detection on SDIO
The only time that the PAN3201DH 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
PAN3201DH begins to drive SDIO after the next falling edge of SCLK. The PAN3201DH 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).
6.4 Serial Interface Watchdog Timer Timeout
When there are only two pins to read register from PAN3201DH, and PD pin can’t be used to re-synchronous
function. If the microprocessor and the PAN3201DH get out of sync, then the data either written or read from
the registers will be incorrect. In such a case, an easy way to solve this condition is to toggle the SCLK line
from high to low to high and wait at least tSIWTT to re-sync the parts after an incorrect read. The PAN3201DH
will reset the serial port but will not reset the registers and be prepared for the beginning of a new transmission.
SCLK
t
SIWTT
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
SDIO
Hi-Z
ADDRESS(R/W)
DATA
t
RESYNC
1us, min
Figure13. Re-synchronous serial interface using watchdog timer timeout


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