21

Figure 25. Pixel address map (surface referenced)

The pixel output order as related to the surface is shown below.

Cable

RB

LB

Top Xray View of Mouse

Positive X

Positive Y

899 898 897 896 895 894 893 892 891 890 889 888 887 886 885 884 883 882 881 880 879 878 877 876 875 874 873 872 871 870

869 868 867 866 865 864 863 862 861 860 859 858 857 856 855 854 853 852 851 850 849 848 847 846 845 844 843 842 841 840

839 838

etc.

~~

~

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0

expanded view of the

surface as viewed

through the lens

last output

first output

~~

~

1

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Error detection and recovery

1. The ADNS-3080 and the micro-controller might get out

of synchronization due to ESD events, power supply

droops or micro-controller firmware flaws. In such a

case, the micro-controller should pulse NCS high for

at least 1 ms. The ADNS-3080 will reset the serial port

(but not the control registers) and will be prepared for

the beginning of a new transmission after the normal

transaction delay.

2. Invalid addresses: Writing to an invalid address will

have no effect. Reading from an invalid address will

return all zeros.

3. 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 NCS.

The ADNS-3080 will not write to any register and will

reset the serial port (but not the control registers) and

be prepared for the beginning of future transmissions

after NCS goes low. The normal delays between reads

after aborted transmissions.

4. The micro-controller can verify success of write opera-

tions by issuing a read command to the same address

and comparing written data to read data.

5. The micro-controller can verify the synchronization of

the serial port by periodically reading the product ID

and inverse product ID registers.

6. The microcontroller can read the SROM_ID register to

verify that the sensor is running downloaded SROM

code. ESD or similar noise events may cause the sensor

to revert to native ROM execution. If this should hap-

pen, pulse RESET and reload the SROM instructions.

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PixArt Imaging Inc.

PixArt Imaging Inc.