PixArt Imaging Inc.
Low Power LED Integrated Slim Mouse Sensor
NOTE: The 0.5/f
minimum high state of SCLK is also
SCLK
the minimum MISO data hold time of the ADNS-3530.
Since the falling edge of SCLK is actually the start of the
next read or write command, the ADNS-3530 will hold
the state of data on MISO until the falling edge of SCLK.
Required Timing Between Read and Write Commands
There are minimum timing requirements between read
and write commands on the serial port.
t
SWW
SCLK
ADDRESS
DATA
ADDRESS
DATA
WRITE OPERATION
WRITE OPERATION
Figure 15. Timing between two write commands
If the rising edge of the SCLK for the last data bit of the
second write command occurs before the required delay
(tSWW), then the first write command may not complete
correctly.
t
SWR
tꢀtꢀtꢀ
tꢀtꢀtꢀ
SCLK
ADDRESS
DATA
ADDRESS
WRITE OPERATION
NEXT READ OPERATION
Figure 16. Timing between write and read commands
If the rising edge of SCLK for the last address bit of the
read command occurs before the required delay (t
the write command may not complete correctly.
),
SWR
t
& t
SRW SRR
t
SRAD
tꢀtꢀtꢀ
tꢀtꢀtꢀ
SCLK
ADDRESS
DATA
ADDRESS
READ OPERATION
NEXT READ
or WRITE OPERATION
Figure 17. Timing between read and either write or subsequent read commands
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PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
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