PixArt Imaging Inc.
ADNS-3090 High-Performance Optical Mouse Sensor
Burst Mode Operation
Motion Read
Burst mode is a special serial port operation mode which This mode is activated by reading the Motion_Burst
may be used to reduce the serial transaction time for register. The ADNS-3090 will respond with the contents
three predefined operations: motion read and SROM of the Motion, Delta_X, Delta_Y, SQUAL, Shutter_Upper,
download and frame capture. The speed improvement is
achieved by continuous data clocking to or from multiple
registers without the need to specify the register address,
Shutter_Lower and Maximum_Pixel registers in that
order. After sending the register address, the micro-
controller must wait t
and then begin reading
SRAD-MOT
and by not requiring the normal delay period between data. All 56 data bits can be read with no delay between
data bytes.
bytes by driving SCLK at the normal rate. The data are
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 t
BEXIT
to terminate burst mode. The serial port is not available
for use until it is reset with NCS, even for a second burst
transmission.
tSRAD-MOT ≥ 75 μs
SCLK
Motion_Burst Register Address
First Read Operation
Read First Byte
Read Second Byte
Read Third Byte
Figure 22. Motion burst timing
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