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A Prototype Optical Tracking System Investigation and Development - page 150 / 170

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Black Spot PCB Modifications

Figure D.1 To remove the short to ground on the buck converter, lift pins 5-8 of FET1 and wire to the cathode of D1.

Figure D.2 To enable the flash select line, cut the track shown and rewire between pin 1 of FLASH1 and the via to the left of R11.

D.4

Image sensor reset

This modification fixes a defective RC filter in the initial design. The board seems to work fine without this modification. Figure D.3 shows the modification. Cut the track as shown and rewire.

D.5

U RT transmit modification

Unfortunately the Blackfin BF533 cannot put the U RT transmit line into a high impedance state. This makes sharing the communications bus with other modules more difficult. To overcome this problem the current limiting resistor in series with Black Spot module’s

transmit line can be replaced with a Shottky diode.

lso, the communications bus requires

one

pullup

resistor

(10K)

between

transmit

and

the

3.3 V

supply.

Figure

D.4

shows

the

Black Spot board. The Shottky diode replaces resistor R4 and its orientation is shown. circuit diagram for the pullup resistor is shown in Figure 5.8.

The

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