DAC161P997EVAL/NOPB

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: 0.00 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: 0.00 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: 0.00 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. Follow the instruction on the screen and direct the operating system to search for appropriate drivers in the installation_directory\Drivers\NSC_USB_v1.0.8.0 4. Connect DAC161P997 Test Board to the Loop supply (up to 40V DC ) Complete evaluation system is shown below SWIF test points LOCAL LDO Header: shunt is inserted by default DAC161P997 HART input SPIO4 ERRLVL SEL Header: shunt is inserted in position [1,2] (here: COM and CENTRE) CPU Reset 5V Supply  2011 National Semiconductor Corporation VDDIO Header: SHUNT MUST ALWAYS BE IN POSITION [1, 2] (here: LEFT and CENTRE) Page 4 of 11 Rev: 0.00 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 3.3V LDO to the VD (VA) rail of the DAC161P997 ERRLVL SEL [COM, CENTER] Sets the input to the ERRLVL pin of DAC161P997 VDDIO [1,2] Provides the rail potential to the stimulus board (SPIO-4). Once the above jumpers are in place, turn on the 5V power supply. In the configuration shown here the loop current sourced from OUT is 3.3mA.  2011 National Semiconductor Corporation Page 5 of 11 Rev: 0.00 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….  2011 National Semiconductor Corporation Page 6 of 11 Rev: 0.00 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. DAC161P997 Config: lets user send data destined for the DAC161P997 internal configuration registers 6. Stimulus Config: lets user modify the operation of the SPIO4 board (stimulus board) The following sections will present the tabs in order that lets the first time user produce output from the DAC161P997 quickly. First select “Stimulus Config” tab…..  2011 National Semiconductor Corporation Page 7 of 11 Rev: 0.00 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. Re-start SWIF with any of the SEND buttons in other tabs SWIF Continuous Mode Set Intra-Frame Symbol=D Set ERRLVL=HI  2011 National Semiconductor Corporation When checked SPIO4 will continue looping through the content of the SWIF data buffer (Continuous Mode) until STOP button is clicked When cleared SPIO4 sends the content of the SWIF data buffer only once (One Shot Mode )and follows it with repeated Intra-Frame symbol until STOP is clicked NOTE: Updating this control stops SWIF if already active. Re-start SWIF with any of the SEND buttons in other tabs When checked SPIO4 sets the Intra-Frame Symbol to D (50% duty cycle). This setting keeps the link active at all times, even though no meaningful data is being sent. When cleared SPIO4 sets the Intra-Frame Symbol to LO (0% duty cycle). NOTE: Intra-Frame Symbol exists only in the context of the “SWIF One Shot Mode” NOTE: Updating this control stops SWIF if already active. Re-start SWIF with any of the SEND buttons in other tabs Instructs SPIO4 board to set HI the ERRLVL input to DAC161P997. In the default set-up that functionality is not available. To enable it a jumper should be installed connecting points marked with “A” on the DAC161P997 Test Board Page 8 of 11 Rev: 0.00 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…. Details for later: Control Description of Functionality ACK Check this box to insert and ACK symbol in the SWIF data stream Send Sends the data representing the output current magnitude to SWIF data buffer on SPIO4, and activates the link to DAC161P997 Send File Click this control to select a file as the source of SWIF data. SWIF data file is a text file containing only ‘0’, ‘1’, ‘A’ or ‘D’ characters (representing valid SWIF symbols). It is up to the user to format the data frames. When file is read-in the name of the file will appear above “Send File” button and the “Loop Current” entry box will be cleared. Stop Stops SWIF activity Check ACK, NACK SPIO4 monitors the number of A symbols issued by the SWIF. Each symbol issued increments the ACK count. The number of responses from the DAC161P997 is also being monitored: for every A issued by SWIF the lack of response from DAC161P997 increments the NACK count. Both counters are cleared by STOP followed by SEND  2011 National Semiconductor Corporation Page 9 of 11 Rev: 0.00 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 National Semiconductor Corporation Page 10 of 11 Rev: 0.00 National Semiconductor DAC161P997EVAL User’s Guide BY USING THIS PRODUCT, YOU ARE AGREEING TO BE BOUND BY THE TERMS AND CONDITIONS OF NATIONAL SEMICONDUCTOR'S END USER LICENSE AGREEMENT. DO NOT USE THIS PRODUCT UNTIL YOU HAVE READ AND AGREED TO THE TERMS AND CONDITIONS OF THAT AGREEMENT. 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