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A Prototype Optical Tracking System Investigation and Development - page 86 / 170

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72

Black Spot Hardware

Figure 5.12 The PCB panel contains 9 individual Black Spot boards. Here the front three have been loaded with the BGA parts.

Image sensor reset

minor error in the RC circuit meant that the reset line was not being cleared as per the specification at start-up. This did not appear to affect the functioning of the system.

U RT transmit modification

The Blackfin BF533 cannot tristate the U ing the bus between camera modules.

RT transmit line and this lead to problems shar- s described, a reverse biased Shottky diode was

used to replace the current protection resistor initially designed on the transmit line. was coupled with a pull up resistor on the bus shared between all camera modules.

This

5.6

Summary

The first revision of the camera module hardware design has produced a small module of dimensions 50 × 55 mm with CS Mount Lens holder and the ability to add lens filters.

The board uses the

nalog Devices Blackfin BF533 processor and the Micron MT9V022/23

image sensor.

It can be programmed using the ICE Bear JT

G debugger and the GNU tools

that come with the debugger. Program code can be stored in the non-volatile flash memory and is automatically loaded into the Blackfin for execution when the chip is powered on. Further design details are given in the appendices. The Black Spot schematic is given in

ppendix schematic.

.

ppendix D details the modifications required in order for the PCB to match

The unmodified PCB is shown in

ppendix B and the PCB placed in a panel

array for production is shown in

ppendix C. The Black Spot Bill of Materials (BOM) is

given in

ppendix E.

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