National Semiconductor DAC161P997EVAL User’s Guide July 20, 2011 Rev – 0.00 RoHS Compliant Evaluation Board User's Guide DAC161P997 Single-Wire 16-bit DAC for 4-20mA Loops 2011 National Semiconductor Corporation Page 1 of 11 Rev: 0.
National Semiconductor DAC161P997EVAL User’s Guide 1. Kit Components Item Qty. Description DAC161P997EVAL 1 DAC161P997CISQ Device evaluation board PuffyALP_11012010_200_0026.exe 1 SPIO4 1 2011 National Semiconductor Corporation Application software available from: http://portal.national.com/store/view_item/index.html?nsid=D AC161P997EVAL USB interface board purchased separately at: http://portal.national.com/store/view_item/index.html?nsid=S PIO-4 Page 2 of 11 Rev: 0.
National Semiconductor DAC161P997EVAL User’s Guide 2. Software Installation Copy the installation program to a temporary directory. Start the program and follow the instruction on the screen: the user will be asked to agree to the terms and conditions, the options will be presented for selecting installation directory, etc. Note the path to which the software is installed (installation_directory). 2011 National Semiconductor Corporation Page 3 of 11 Rev: 0.
National Semiconductor DAC161P997EVAL User’s Guide 3. Kit Assembly 1. Plug in the DAC161P997EVAL board into 32 pin header of the SPIO4 board 2. Plug in the USB cable into the SPIO4 board socket 3. Plug in the USB cable to the USB port on the host PC If this is the first time this evaluation system is connected to host PC, the operating system will attempt to install the USB driver software for the SPIO4 board.
National Semiconductor DAC161P997EVAL User’s Guide 4. Default Set-Up and Power-Up As shipped the DAC161P997 Test Board is configured to be powered directly from the 0-20mA loop. Local LDO (LM2936) provides 3.3V to DAC161P997 by stepping down the loop supply. The loop is connected via terminals 5 and 6 of J1 connector. The optional shunt between terminals 2 and 3 will power up the on board diagnostic LEDs. Jumper block Shunt position Function LOCAL LDO in Connects the output of the 3.
National Semiconductor DAC161P997EVAL User’s Guide 5. ALP User Interface Software Start by either navigating START-> National Semiconductor Corp -> Analog LaunchPAD v2…. ->Analog LaunchPAD or, if installed, by clicking desktop shortcut. The first screen is shown below. If the system is properly assembled the SPIO4Board 1, and PuffyDAC should be listed in the Devices menu in the left-hand side of the window. Click on PuffyDAC in Devices Menu to continue….
National Semiconductor DAC161P997EVAL User’s Guide “Information” Tab Selecting PuffyDAC in the Devices menu will activate the PuffyDAC screen. This screen contains 6 tabs. 1. 2. 3. 4. Information: Shows the basic system information Registers: this tab is not activated in present release of software Scripting: Python interpreter window DAC161P997 Data: lets user send DAC output update data (DAC update data changes output current at OUT pin of the device) 5.
National Semiconductor DAC161P997EVAL User’s Guide “Stimulus Config” Tab Check the “SWIF Continuous mode”. Then go to “DAC161P997 Data” tab…. Details for later: Control Description of Functionality SWIF Baud Rate Sets the Bud rate of the SWIF link. New entry must be followed by key. NOTE: Update stops the SWIF activity.
National Semiconductor DAC161P997EVAL User’s Guide “DAC161P997 Data” Tab Click on and type in the “Loop Current (mA)” the desired current magnitude to be produced by DAC161P997 output. Then press green SEND button. Observe the current….
National Semiconductor DAC161P997EVAL User’s Guide “DAC161P997 Config” Tab Control Description of Functionality 8-bit Value (bin) Enter a string of ‘0’ and ‘1’ characters representing configuration data for each of the DAC161P977 internal registers ACK same as in “DAC161P997 Data” tab Send Sends the register address and data to the SWIF data buffer on SPIO4, and activates the link to DAC161P997 STOP same as in “DAC161P997 Data” tab Check ACK, NACK same as in “DAC161P997 Data” tab 2011 Natio
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