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ADNS-3040 Datasheet(PDF) 13 Page - Agilent(Hewlett-Packard)

Part No. ADNS-3040
Description  Ultra Low-Power Mouse Sensor
Download  26 Pages
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Maker  HP [Agilent(Hewlett-Packard)]
Homepage  http://www.home.agilent.com
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ADNS-3040 Datasheet(HTML) 13 Page - Agilent(Hewlett-Packard)

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13
register. The ADNS-3040 will
respond with the contents of
the Motion, Delta_Y, Delta_X,
SQUAL, Shutter_Upper,
Shutter_Lower and
Maximum_Pixel registers in
that order. The burst
transaction can be terminated
after the first 3 bytes of the
sequence are read by bringing
the NCS pin high. After
sending the register address,
the micro-controller must wait
tSRAD and then begin reading
data. All data bits can be
SCLK
Address
Data
tSWW
Write Operation
Address
Data
Write Operation
Figure 17. Timing between two write commands
Address
Data
Write Operation
Address
Next Read
Operation
SCLK
tSWR
Figure 18. Timing between write and read commands
Next Read or
Write Operation
Data
tSRAD
Read Operation
Address
tSRW & tSRR
Address
SCLK
Figure 19. Timing between read and either write or subsequent read commands
Motion_Burst Register Address
Read First Byte
First Read Operation
Read Second Byte
SCLK
tSRAD
Read Third Byte
Figure 20. Motion Burst Timing
Required timing between Read and
Write Commands
There are minimum timing
requirements between read
and write commands on the
serial port.
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.
If the rising edge of SCLK for
the last address bit of the read
command occurs before the
required delay (tSWR), the
write command may not
complete correctly.
During a read operation SCLK
should be delayed at least
tSRAD after the last address
data bit to ensure that the
ADNS-3040 has time to
prepare the requested data.
The falling edge of SCLK for
the first address bit of either
the read or write command
must be at least tSRR or tSRW
after the last SCLK rising edge
of the last data bit of the
previous read operation.
Burst Mode Operation
Burst mode is a special serial
port operation mode that may
be used to reduce the serial
transaction time for a motion
read. The speed improvement
is achieved by continuous data
clocking from multiple registers
without the need to specify the
register address, and by not
requiring the normal delay
period between data bytes.
Burst mode is activated by
reading the Motion_Burst
read with no delay between
bytes by driving SCLK at the
normal rate. The data is
latched into the output buffer
after the last address bit is
received. After the burst
transmission is complete, the
micro-controller must raise the
NCS line for at least tBEXIT to
terminate burst mode. The
serial port is not available for
use until it is reset with NCS,
even for a second burst
transmission.


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