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DC590A-1 Fiches technique(PDF) 5 Page - Linear Integrated Systems |
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DC590A-1 Fiches technique(HTML) 5 Page - Linear Integrated Systems |
5 / 9 page QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 590 USB SERIAL CONTROLLER FOR LINEAR TECHNOLOGY QUICKEVAL™ DEMO BOARDS LED INDICATORS Two LED indicators are provided. The “ISOL PWR” LED is lit when either the onboard switching power supply is running or external power is applied to the isolated side of the board. The “COMMAND” LED indicates that a command has been sent to the board by the host PC and is waiting to be executed. The LED may not appear to be blinking in some cases, as the duty cycle may be very short. CIRCUIT DETAILS Schematics for the isolated power supply and optical signal isolation are attached to the end of this Quick Start Guide. Example microcontroller code is device- specific, and may be included in the Quick Start Guide for the demonstration circuit under evaluation. OPTICAL ISOLATION The optical isolation scheme based on the Agilent HCPL 2300 high speed opto isolator and is designed to allow bidirectional SPI and I2C communications. Isolation schemes that are designed for only SPI or I2C will differ slightly. Contact Linear Technology Applications Engi- neering for more information. SWITCHING POWER SUPPLY The onboard switching supply is based on the LT1425 flyback regulator. Feedback is taken from the primary side of T1, eliminating the need for optical feedback. T2 and C9 provide common mode filtering. Refer to the LT1425 data sheet for details of operation. TROUBLESHOOTING GUIDE DC590 is plugged in, but QuickEval screen still says “USB Serial Controller Not Connected” The most likely cause is improper installa- tion of the USB drivers, which causes Windows to rec- ognize DC590 as an “Unknown Device.” Open the Win- dows Control Panel, open “System” and click the “De- vice manager” tab. Open the “Other Devices” item and look for USB SERIAL CONTROLLER. Select this item and click the remove button. Unplug DC590, Re-install the QuickEval software, and follow the on-screen instruc- tions. Demo board software loads properly, but will not run or gives “Device Not accessible” errors. Verify that the demo board is properly powered up. This Quick Start Guide lists the basic power connections to DC590. Some demo boards may have additional requirements; refer to the demo board’s Quick Start guide for details. Solution: Problem: Solution: After connecting the demo board to DC590 with the supplied 14 pin ribbon cable, QuickEval soft- ware still displays “Evaluation Board is not Connected.” Problem: Contact Linear Technology Applications Engineering. Solution: Problem: 5 |
Numéro de pièce similaire - DC590A-1 |
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Description similaire - DC590A-1 |
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