An Evaluation System for the TSL2550 Ambient Light Sensor Plugging the motherboard into an active RS232 port (supporting RTS and DTR) will power the mother and daughter boards. No external power is required unless SMBus devices requiring more than a couple milliamps are attached to the 5-pin SMBus headers (also on the motherboard), or if the onboard SX microcontroller is in debug mode or is being programmed. To provide more power ( not to exceed 100 ma ) to the motherboard, an external supply can be connected to the DB9 as follows: 1. Pins 4 and 7: +6 to +7.5VDC. ( Note: Connect both pins.) t 2. Pin 5: Ground. To provide more power to the motherboard and communicate wih a PC at the same time , an adapter will have to be made incorporating the above connections in a DB9 male plug, plus a DB9 female with pins 2, 3, and 5 only connected to the same pins on the male plug. The Ubicom SX is programmed by removing the jumper on the 5-pin right-angle programming connector and installing the SXKey which is available from Parallax, Inc. at www.parallax.com. With the DB9 connector at 12 o’clock and the SXKey sticking out at 9 o’clock, use the four bottom header pins. Vss is the bottom pin. The external SMBus header pins (two identical 5-pin headers) are labeled on the housing’s panel cutout: +5 for Vdd, D for data, G for ground, and C for clock. See Figure 2 for a schematic diagram of the TSL2550 Serial EVM.

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ETTING

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TARTED On most PCs, installation will automatically start when the CD-ROM is inserted into the drive. If the installation does not begin: Click Start Click Run Note: After inserting the PCMCIA card into the appropriate card slot, a message will be displayed on the screen indicating that a new card was found and a driver needs to be installed. Follow the instructions to install the driver and software. Below are some additional guidelines when using the TSL2550 PCMCIA EVM: Type D:\setup and press Enter. IMPORTANT: Use the appropriate drive letter in the above command to install the software. CD-ROMs are commonly Close the EVM application program before removing the PCMCIA card D: Close the EVM application program when the computer is not in use so that the program is not active when your computer goes into sleep mode The installation program will guide you through the product installation Refer to the ReadMe file on CD for the latest installation instructions. If more than one PCMCIA EVM card is used:

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Close the EVM Software

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Remove PCMCIA EVM card

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Insert new PCMCIA EVM card

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Activate EVM Software Note: The TSL2550 Serial EVM software will automatically search for an available RS232 communication port until the serial EVM hardware is located.
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