ADNS-3090 Datasheet, PDF (17/38 Pages) Pixart Imaging Inc. – High-Performance Optical Mouse Sensor

PixArt Imaging Inc.
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Required timing between Read and Write Commands (tsxx)
There are minimum timing requirements between read and write commands on the serial port.
tSWW ≥ 50μs
SCLK
Address
Data
Address
Data
Write Operation
Write Operation
Figure 19. 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 50 microsecond
required delay, then the first write command may not complete correctly.
tSWR ≥ 50μs
SCLK
Address
Data
Address
Write Operation
Figure 20. Timing between write and read commands
Next Read
Operation
If the rising edge of SCLK for the last address bit of the read command occurs before the 50 microsecond required
delay, the write command may not complete correctly.
tSRAD ≥ 50 μs for non-motion read
tSRAD-MOT ≥ 75 μs for register 0x02
tSRW & tSRR > 250 ns
SCLK
Address
Data
Address
Read Operation
Next Read or
Write Operation
Figure 21. Timing between read and either write or subsequent read commands
The falling edge of SCLK for the first address bit of either the read or write command must be at least 250 ns after
the last SCLK rising edge of the last data bit of the previous read operation. In addition, during a read operation SCLK
should be delayed after the last address bit to ensure that the ADNS-3090 has time to prepare the requested data.
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PixArt Imaging Inc.
E-mail: [e-mail]
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