Related Manuals for National Semiconductor DAC161P997
Summary of Contents for National Semiconductor DAC161P997
- Page 1 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...
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Page 2: Kit Components
DAC161P997EVAL User’s Guide 1. Kit Components Item Qty. Description DAC161P997EVAL DAC161P997CISQ Device evaluation board Application software available from: PuffyALP_11012010_200_0026.exe http://portal.national.com/store/view_item/index.html?nsid=D AC161P997EVAL USB interface board purchased separately at: SPIO4 http://portal.national.com/store/view_item/index.html?nsid=S PIO-4 © 2011 National Semiconductor Corporation Page 2 of 11 Rev: 0.00... -
Page 3: Software Installation
Note the path to which the software is installed (installation_directory). © 2011 National Semiconductor Corporation Page 3 of 11 Rev: 0.00... -
Page 4: Kit Assembly
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 LOCAL LDO Header: shunt... - Page 5 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.
- Page 6 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.
- Page 7 2. Registers: this tab is not activated in present release of software 3. Scripting: Python interpreter window 4. 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.
- Page 8 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 Set ERRLVL=HI that functionality is not available. To enable it a jumper should be installed connecting points marked with “A”...
- Page 9 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 Check ACK, NACK issued by SWIF the lack of response from DAC161P997 increments the NACK count.
- Page 10 Enter a string of ‘0’ and ‘1’ characters representing configuration data for each of the 8-bit Value (bin) DAC161P977 internal registers same as in “DAC161P997 Data” tab Sends the register address and data to the SWIF data buffer on SPIO4, and activates the Send...
- Page 11 European EMC Directive 89/336/EEC, or for compliance with any other electromagnetic compatibility requirements. National Semiconductor Corporation does not assume any responsibility for use of any circuitry or software supplied or described. No circuit patent licenses are implied.
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Page 12: Important Notice
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
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