National Semiconductor ADC121C021 User Manual

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National Semiconductor ADC121C021 User Manual Manual pdf 11 page image

http://www.national.com115.4 Troubleshooting WaveVision5.4.1 ProblemsProblem 1: The ìADC121C021 Eval BoardîControl Panel appears briefly, but disappears afterpowering on the WaveVision board. Try SolutionsA, B, and C. After trying these solutions, theWaveVision system must be hard reset torecover. Press SW1 on the WV4 board to resetthe system.Problem 2: The following error occurs when I tryto acquire data samples. Try Solution D.Problem 3: The following error occurs when I tryto read or write registers through the ControlPanel. Try Solution D.Problem 4: One of the following errors occurswhen I try to read or write registers through theControl Panel. ìjava.lang.Exception: A USBÖCMD_REG_RW Ö while sending bulk read.îìAn exception occurred. Control PanelÖîTry Solutions A, B, and C. After trying thesesolutions, the WaveVision system must be hardreset to recover. Press SW1 on the WV4 board toreset the system.Problem 5: The Eval Board is not recognizedcorrectly in the System Settings Window (Figure9). Try Solutions D and E.5.4.2 SolutionsSolution A: Ensure power is supplied to the VAsupply on the board. A single jumper must beplaced across either pins 1&2, pins 3&4, pins 7&8,or pins 9&10 of JP5 to select the boardís powersource. If using the Shunt Reference, pins 1&2 ofJP7 must be shorted. The VA supply is measuredby probing VIA10.Solution B: Ensure the pull-up resistors arepowered (R8 and R9). In Computer mode, JP2must be shorted by a jumper for the WaveVisionsoftware to work properly.Solution C: Ensure the board is firmly connectedto the WV4 board via the WV4S connector (J1).See Figure 6.Solution D: Ensure the I2 C Slave address is setcorrectly in WaveVision. If evaluating theADC121C021, the address must be set to 0x54.If evaluating the ADC121C027, the address willbe 0x50 if no user modifications have been madeto the board and ADDR is floating. If ADDR is tiedto GND, the address must be set to 0x51. IfADDR is tied to VA , the address must be set to0x52.Solution E: Ensure the 3P3V supply is connectedto the 3.3V regulated supply from the WV4 board.The 3P3V supply is measured by probing pin 1 ofJP5. Test this with a volt-meter. The EEPROM(U4) must be powered with 3.3V for WaveVisionto work properly.