User's Guide SBAU177A – September 2010 – Revised May 2013 AMC7812EVM-PDK User’s Guide AMC7812EVM and AMC7812EVM-PDK This user's guide describes the characteristics, operation, and use of the AMC7812EVM, both by itself and as part of the AMC7812EVM-PDK. The AMC7812EVM and AMC7812EVM-PDK are two evaluation fixtures for the AMC7812, an intelligent analog monitor and control circuit with a 16-channel, 12-bit analogto-digital converter (ADC) and 12,12-bit digital-to-analog converters (DACs).
www.ti.com 1 2 3 4 5 6 7 8 Contents EVM Overview ............................................................................................................... 3 Analog Interface ............................................................................................................. 4 Digital Interface .............................................................................................................. 5 Power-Supply Interface ................................................................
EVM Overview www.ti.com 1 EVM Overview 1.
Analog Interface 2 www.ti.com Analog Interface For maximum flexibility, the AMC7812EVM is designed for easy interfacing to multiple analog sources by means of different connection options. 2.1 Remote Temperature Inputs Connection There are two pairs of pins (four pins on the AMC7812: D1+, D1–, D2+ and D2–) that can be connected to a remote temperature sensor, such as discrete PNP or NPN transistors 2N3906 or 2N3904. On the EVM board, a 2N3904 is installed on the PCB as an input for D1+ and D1–.
Digital Interface www.ti.com 2.3 DAC Output Connection The AMC7812 contains 12, 12-bit DACs that provide digital control with 12 bits of resolution with an internal reference or an external reference. Samtec part numbers TSM-118-01-T-DV-P and SSW-110-22-F-D-VS-K provide a convenient 18-pin header/10-pin socket combination at J3. This header/socket provides access to the DAC outputs and related pins of the AMC7812. Consult Samtec at http://www.samtec.
Power-Supply Interface www.ti.com Table 3.
Power-Supply Interface www.ti.com 4.1 AMC Power Supplies Power for the AMC7812 primary analog supply AVDD (including AVDD1 and AVDD2 power pins) and the AMC7812 core digital supply DVDD can be supplied either from the J5 connector or the J9 terminal block selected by JP16. Moreover, the voltage from the J5 connector can be either +3.3 VDC or +5 VDC, selected by JP17. Power for the AMC7812 DAC output AVCC can be supplied either from the J5 connector or the J8 terminal block, selected by JP15.
Power-Supply Interface 4.3 www.ti.com AMC7812EVM-PDK Operation Power When the AMC7812EVM PCB is used as a daughterboard, power can be supplied from the connector to the motherboard through the power-supply connector, J5. Refer to Table 5. The AMC7812EVM-PDK includes a USB-MODEVM board as the motherboard, which provides power to the AMC7812EVM board through connector J5. Power to the motherboard USB-MODEVM board can be supplied from one of the following different sources: • Through a USB connection • 6.
EVM Hardware Configuration www.ti.com 5 EVM Hardware Configuration Before operation, the AMC7812EVM board may need to be set up. Figure 1 illustrates the location and orientation of the various EVM jumpers. Figure 1.
EVM Hardware Configuration www.ti.com In Figure 1, all 18 jumpers of the AMC7812EVM are highlighted in yellow. The definitions and default settings of these 18 jumpers are listed in Table 7. Table 7.
EVM Hardware Configuration www.ti.com 6 EVM Hardware Configuration The following sections of this user guide provide information about operating the AMC7812EVM-PDK, including setup, program installation, and software use as well as its operational description. 6.1 6.1.
EVM Hardware Configuration www.ti.com All switches and jumpers on both mother- and daughterboards should remain in the respective default positions as shipped from the manufacturer, except SW2-1, which should be set to Off. The default jumper and switch positions for the AMC7812EVM board and the USB-MODEVM board are summarized in Table 7 and Table 8, respectively. Table 8.
EVM Hardware Configuration www.ti.com Step 10. Click on Have Disk.... Select Browse..., and find the file AMC7812EVM.inf. This file is included with the installer and should be in this directory: C:\Program Files\Texas Instruments\AMC7812EVM \data\ Step 11. Select the AMC7812EVM.inf file and click on it. The PC should install it automatically. Step 12. Click on Finish to complete the installation. Once the installer has completed its processes, you are done and ready to operate the AMC7812EVM software.
EVM Hardware Configuration www.ti.com Click on the OK button to continue, and the software graphical user interface (GUI) appears, as Figure 4 illustrates. Figure 4. AMC7812EVM-PDK Software GUI: Start-Up Screen with Monitoring Temp Tab Three temperature monitoring sections appear, with the local (or AMC7812 silicon) temperature displayed at the left section of the tab.
GUI Software and Operating Descriptions www.ti.com 7 GUI Software and Operating Descriptions Once you have connected the AMC7812EVM to the USB-MODEVM motherboard and provided power to the motherboard from a USB port on your PC, start the AMC7812EVM-PDK software; correspondingly, the GUI should display (refer to Figure 4). The common software settings, controls, or display sections for the AMC7812EVM-PDK are arranged at the top and bottom of the GUI.
GUI Software and Operating Descriptions www.ti.com At the lower right-hand section of the GUI, there is a control button to enable or disable the auto-read function of the AMC7812 registers. If it is enabled, all registers of the AMC7812 are read continuously. The AMC registers include: temperature data, alarm data, ADC data, and DAC data. Additionally the fifth tab on the AMC7812EVM software, Register Map (see Figure 14), is updated with the values read.
GUI Software and Operating Descriptions www.ti.com The AMC and Alarms tab displays alarm information for the AMC Chip Temperature, D1 Temperature, and D2 Temperature status. These indicators are highlighted with a yellow box in Figure 6. Also highlighted in Figure 6 are false alarm protection settings for each alarm that can trigger with the AMC7812; these settings allow the user to choose how many consecutive triggers must occur before the alarm goes off.
GUI Software and Operating Descriptions 7.3 www.ti.com Monitoring Temperature Tab The AMC7812 contains one internal (also called local or AMC) temperature sensor and two temperature measurement ports D1 and D2 for sensing temperatures from external remote locations. This tab enables users to access or observe the AMC7812 registers and register bits related to the three temperature monitoring functions.
GUI Software and Operating Descriptions www.ti.com At the top of each temperature monitoring section, the corresponding temperature is displayed by the meter in degrees Celsius (°C). The raw data is also displayed at the top of the meter. These features are highlighted by the red box in Figure 8. The area highlighted in a yellow box is an additional control to set the conversion rate of temperature data from the AMC7812. 7.
GUI Software and Operating Descriptions www.ti.com This tab can be grouped into three sections, as shown by the colored rectangles Figure 9. ADC reference selection can be made using the panel of settings highlighted in yellow in figure 9. Auto-mode is disabled for evaluation of the AMC7812 and direct sampling mode must be used, but emulates auto-mode by periodically sending convert start commands to the AMC7812. Located below the section highlighted in yellow is a control to turn the ADC power on or off.
GUI Software and Operating Descriptions www.ti.com 7.5 DAC Channels Tab This tab allows users to access or observe the AMC7812 control and data registers, and register bits of the configurations, modes, status, and data for theDACs and the outputs of the AMC7812. Clicking on the tab DAC Channels brings up a screen similar to that shown in Figure 10. This tab can be grouped into four sections, as highlighted in the illustration. Figure 10.
GUI Software and Operating Descriptions www.ti.com The first section is highlighted with the orange rectangle in Figure 10, and allows the user to make modifications to high and low threshold register settings in the AMC7812 in addition to hysteresis register settings. The second section of this tab, highlighted in red, is used to write settings to the DAC channel registers.
GUI Software and Operating Descriptions www.ti.com To implement such a test, the connection from the AMC7812 DAC output to the AMC7812 ADC input should be made as shown by Figure 12. In this example, the upper four DAC outputs were looped back to the upper four ADC channel inputs Ch0 to Ch3. CAUTION For the analog loopback test, the DAC signal range must be within the ADC input range. CH0 CH1 CH2 CH3 DAC0 DAC1 DAC2 DAC3 Figure 12.
GUI Software and Operating Descriptions www.ti.com Next, shift to the ADC channels tab, as shown in Figure 13. Then: • Power up the ADC by clicking on the control next to the label ADC Power • Click the pulldown menu for CH0/CH1 configuration and select CH0 and CH1 as SE • Click the pulldown menu for CH2/CH3 configuration and select CH2 and CH3 as SE Figure 13.
GUI Software and Operating Descriptions www.ti.com 7.7 Register Map The Register Map tab allows users to view the Register Map of the AMC7812 and its current register settings from the AMC7812EVM-PDK software. No modifications can be made to the register settings directly from this tab, but it can be useful for debugging or assistance in understanding the operation of the part. Figure 14 shows the AMC7812EVM-PDK Register Map tab. Figure 14.
Schematics and Layout 8 www.ti.com Schematics and Layout Schematics for the AMC7812EVM are appended to this user's guide. The bill of materials for the modular AMC7812EVM evaluation board is provided in Table 9. NOTE: All components should be compliant with the European Union Restriction on Use of Hazardous Substances (RoHS) Directive. Some part numbers may be either leaded or RoHS. Verify that purchased components are RoHS-compliant.
Schematics and Layout www.ti.com 8.1 PCB Layout Figure 15 illustrates the silkscreen image for the AMC7812EVM. Figure 15.
1 2 3 4 5 6 Revision History IOVDD R22 20K J6 R23 20K REV NI C3 1.0uF C4 C5 1.0uF 1.
EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods.
FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
【Important Notice for Users of EVMs for RF Products in Japan】 】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. 2. 3. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.
EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use.
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
