PixArt Imaging Inc.
ADBS-A350 Optical Finger Navigation
Figure 9. Output pin status and Frame Start
Referenced to Figure 10 above, the sensor will output will output the least significant bits D3 to D0. Then a pixel
signals based on the 24 MHz clock signal via the GPIO
end state (a high in MISO_SDA and low in EVENT_INT) will
pin. Executing the sequence of register setting outlined in follow. This completes the first pixel address 0 data. The
Image Dump Commands above will initiate image dump. next pixel address 1 data is then clocked out with a pixel
After step #6, each MISO_SDA pin and EVENT_INT pin
will go high for 4 clock cycles. This indicates pixel frame
start. Then after 4 clock cycles, MISO_SDA pin will go low
and EVENT_INT pin is still high. This indicates pixel begin
state.
begin state, 4 clock cycles of data followed by a pixel end
state in the same manner. This will continue until all the
361 pixels (19x19 pixel array) data is read.
Pixel byte format
Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit1
The pixel bits will start to clock thereafter. Each pixel is
represented by an 8-bit data or value. MISO_SDA pin will
output the most significant bits D7 to D4 and Motion pin
D7
D6
D5
D4
D3
D2
D1
D0
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PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
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