DEMO MANUAL DC1223A-B USB to SMBus/SPI Interface DESCRIPTION Demonstration circuit 1223A-B facilitates communication Write Byte, Read Byte, Write Word, Read Word, Block between PC-based user interface software and Linear Write, Block Read and Block Write-Read Process calls. It 2 Technology SMBus/I C demonstration boards. DC1223A-B also supports additional command protocols for PMBus: connects to the computer via USB. It receives power from Extended Read Byte, Extended Write Byte, Extended Read the USB and isolates the computer ground from the SMBus/ Word, Extended Write Word and Group Send. It can also 2 I C demonstration board. DC1223A-B adds to DC1223A, monitor the SMBus traffic of an existing communication the SMBus monitoring feature. The DC1223A-B can be between a master and a slave. Contact the Linear Technol- used in three ways, depending on the software available ogy sales department for the latest general user interface for the demonstration board under evaluation (DBUE): software. QuikEval Mode DC410 Emulation Mode (Windows XP Only) QuikEval mode is the easiest way to communicate with A number of Linear Technology demonstration boards 2 a Linear Technology SMBus/I C demonstration board. offer software for use with the DC410 Serial Port-to- However this is limited to newer battery charger demo SMBus Interface Board, e.g. DC285 (LTC1695), DC182 boards like the DC1259A. QuikEval application-specific (LT1786F), DC286 (LTC1960), DC486 (LTC1760), DC496 user interfaces are available at DEMO MANUAL DC1223A-B QUICK START PROCEDURE (QuikEval MODE) Demonstration circuit 1223A-B is easy to set up to 3. Check to see if there are already pull-up resistors on the evaluate the performance of Linear Technology SMBus/ DBUE. If yes, set jumpers JP1 and JP2 on DC1223A-B 2 I C demonstration boards DC1223A-B. Refer to Figure 1 to Open. for proper measurement equipment setup and follow the 4. Check to make sure jumper JP4 is on Direct. JP4 procedure below. should only be on VCP if it is doing RS232 emulation Note: The DC1223A-B Is powered from the Host PC for replacing DC410. See Appendix B for this feature. via USB. 5. The Found New Hardware Wizard window may popup. 1. Download the QuikEval software from