SAT0003_REV3.0 Test Procedure Texas Instruments for TPS40422 EVM Module

Transcription

1 Texas Instruments SAT0003_REV3.1 Test Procedure April 23, 2013 Scott McElroy Note: The SAT0003_REV3.1 is an evaluation module for the TPS40422 using the MSP430G2553 to test the functionality of the PMBus. Scott McElroy Page 1 of 15 April 23, 2013

2 General 1.1 PURPOSE To provide detailed instructions for testing the SAT0003_REV3.1 modules. 1.2 SCOPE Covers complete instructions for testing the SAT0003_REV3.1 Modules 1.3 REFERENCE DOCUMENTATION Datasheet: SLUSAQ4C from TI.com Schematic SAT0003_REV3.pdf Assembly SAT0003_REV3_Project.pdf BOM: SAT0003_REV3_BOM.pdf 1.4 Software Provided upon request: SAT0003 TEST Program Code Composer Project Contact Scott McElroy at TI ( or for assistance. Project files for MSP430G2553: TPS40422.h usci_i2c.c usci_i2c.h Main.c Files will be pre-load to the MSP430 and provided for testing 1.5 MATERIALS Two 2.0 Ohm / 3W through-hole resistors 1.6 DEFINITIONS UUT Unit Under Test 2 SAFETY 2.1 Safety Glasses are to be worn. 2.2 This test must be performed by qualified personnel trained in electronics theory and understand the risks and hazards of the assembly to be tested. 2.3 ESD precautions must be followed while handling electronic assemblies while performing this test. 2.4 Precautions should be observed to avoid touching areas of the assembly that may get hot or present a shock hazard during testing. 3 QUALITY 3.1 None 3.2 None Scott McElroy Page 2 of 15 April 23, 2013

3 4 APPAREL Appropriate apparel must be worn during this test to ensure the safety of the operator as well as the safety of the UUT. Example of appropriate apparel includes safety glasses, ESD smock, etc. Scott McElroy Page 3 of 15 April 23, 2013

4 5 EQUIPMENT The following equipment is needed to complete this test procedure 5.0 Test Fixture Test Fixture SAT0003 to be supplied by Texas Instruments. Module under test will be plugged into test fixture with DC power connector. All power and load connections and all measurements will be mode thru this fixture. All connections and Test points mentioned below are on this fixture. Unless otherwise indicated, all output names are based on what is marked on Test Fixture. 5.1 Power Supply A wall power supply capable of supplying 12V@5A. A USB Power Supply source of at least 5V@1A for supply to the MSP430. Scott McElroy Page 4 of 15 April 23, 2013

5 5.2 Loads There will be two terminal block loads. Both of which are 2.0 3W and will be connected as such. 5.3 Meters 3 Meters is best: 2 of which will be voltmeters to measure both output voltages. 1 Voltmeter will be used to measure the input voltage. 5.4 USB Interface This will be supplied by Texas Instruments with one end going to a USB power source and the other end to the Mini USB of the MSP430 Launchpad. 5.5 MSP430 with Pre-Loaded code This device will be provided by Texas Instruments with Pre-Loaded code to be used for the testing of the SAT0003 platform. Scott McElroy Page 5 of 15 April 23, 2013

6 6 EQUIPMENT SETUP 6.1 Input Supply Prior to plugging into wall, plug DC power connector into the J3 barrel jack of SAT0003 board. (The wall adapter will be provided) (Seen below) After this is complete, connect the Mini-USB end of the usb cable into the MSP430 Launchpad prior to plugging into USB source. See Below. 6.2 Outputs There will be 2 supplied resistors, both of which will be 2.0 Ohms@3W. Take one of the resistors and connect one lead to the negative slot of the J7 connector. Connect up the other lead to the positive slot of the J7 connector. See figure below. Do the same for the other resistor on the J9 connector. Scott McElroy Page 6 of 15 April 23, 2013

7 6.3 Jumper Setting Place Jumper in the same orientation as seen in the below figure. Be sure that they are connected up exactly as seen. 6.4 Meters One Voltmeter will be connected to the positive and negative terminals of the J7 connector. Another will be connected a in the same configuration on the J9 terminal. Scott McElroy Page 7 of 15 April 23, 2013

8 The third voltage meter will be connected across the test points seen below. The positive TP1 and negative TP2 terminals configured as shown. This voltage should read about 12V DC at power up if it does not check, check to make sure that the DC Wall plug has power. 6.5 MSP430 Connection The MSP430 Launchpad connector will be connected to the J2 connector from the bottom of the board as shown. Scott McElroy Page 8 of 15 April 23, 2013

9 Make sure to line up the three pin header between both boards. Make sure that the headers are removed on the MSP430 Launchpad. Also, ensure that R87 and R89 are NOT POPULATED. 7 PROCEDURE Plugging in the Power for the SAT0003 Start out with plugging in the DC Wall adapter into an appropriate wall outlet. Be sure that the Green LED comes on. (seen below) Scott McElroy Page 9 of 15 April 23, 2013

10 After the illumination of the LED, plug in the MSP430 Launchpad usb into an appropriate USB compliant power source DC Voltage Meter Setup Turn on the both voltage meters on, and set them to VDC measurement MSP430 Reset Button There are two buttons located on the MSP430 Launchpad. One of which is labeled RESET. Seen in the below figure. Push this button. Make sure that the light in the above figure is illuminated. IF THE LIGHT DOES NOT ILLUMINATE REFER TO SECTION 8.0 OF THIS DOCUMENT FOR TROUBLE SHOOTING Measuring the DC Voltage Take a look at the DC Voltage Meters on the outputs that were previously setup for Vout1 and Vout2. Scott McElroy Page 10 of 15 April 23, 2013

11 The output should read as follows. Vout1= between V Vout2=between 1.45 and 1.55V FOR FAILURES IN THIS STEP: SEE SECTION Check Jumper Shunt Configurations Do a last minute check to ensure that jump shunt have been placed in the correct configuration. (The MCU test program will FAIL if these jumper shunts are place wrong.). Refer to section 6.3 for placement Program Push Button Start: Part 1 of test program The SAT0003 demo board is configured with a push button to start the program. See figure below. Press this button and the LED in section will turn off. (DO NOT PUSH BUTTON WHILE THE TEST IS RUNNING) This program will run for a few seconds and test all of the hardware configurations to ensure proper current draw and voltage measurements that are internal to the TPS When this test is complete, there will only be two outcomes; A SOLID ON LED, and a blinking LED. SOLID ON LED=PASSED TESTED IF THE LED IS BLINKING AT THIS STAGE THE SAT0003 HAS FAILED. PLEASE REFER TO SECTION Test Program Part 2: External Hardware Check If the SAT0003 has passed the previous stage you can move on to this step. DO NOT POWER DOWN OR PRESS THE ONBOARD BUTTON. Scott McElroy Page 11 of 15 April 23, 2013

12 First the Shunt jumpers need to me configured as shown below. Please set up J1 and J12 as seen. --This configuration connects the MSP430 ADCs to the Programmable Load current sense. Please set up J8 and J10 as seen. --This configuration connects the output of the switcher to the onboard load. After these jumper shunts are put into place, do a visual inspection to make sure that the test LED is on SOLID before continuing. NEXT: Press the test switch the same as was done in part 1 of the program. The test LED should turn off signifying that the program is running the second part of the test. DO NOT TOUCH THE BOARD AFTER THIS PRESS BECAUSE THE BOARD WILL BE HOT! Wait a few seconds for the testing to complete. If the program passes the testing process, the test LED will be SOLID on once more. If the program fails, the test LED will blink continuously at about 1-2 times a second. IF THIS TEST FAILS, PLEASE REFER TO SECTION 8.3 FOR TROUBLESHOOTING. Scott McElroy Page 12 of 15 April 23, 2013

13 8 TROUBLESHOOTING 8.0 Test LED Failure This section of the troubleshooting procedure is for the Failure of the Test LED. If the test LED doesn t come on, check to make sure of the following things in order - J14 jumper has a shunt across its two pins. - Check to make sure that the at the below point of D5 is about V If this voltage value is the correct value, check to see if the R94 is the correct resistance. - If the value of R94 is incorrect be place correct value. If all of these values are correct, then check the values of R68 and R69. These values should be around 10k Ohms. If all of these tests pass, their may be an issue with the PMBus communication to the TPS Check to make sure that the TPS40422 is install correctly. Also, check to see if the voltages on R68 and R69 are about V. IF THE FIX IS FOUND AND SOLVED, PLEASE RESTART THE PROGRAM. 8.1 DC Output Voltage Failures If you have had a problem with this stage of the process this part will explain how to troubleshoot SAT0003 for incorrect output voltages. The correct output voltages are set to be as follows. Vout1 = V Vout2 = V If these voltages are not correct, then do the following. - Check to make sure that J8 and J10 are in the correct positions, seen below. - Make sure that the input voltage is at 12V input at TP1 and TP2. - Ensure that the output resistor connector across each terminal is 2 Ohms. - Ensure that the TEST LED D5 is SOLID on. (If not check the power on the MSP430) Scott McElroy Page 13 of 15 April 23, 2013

14 - Try and press the RESET Button on the MSP430. (Re-check the voltage again, if proper voltages is reading out, start procedure again) - If all fails their may be an issue with the TPS40422 device. There may also be a short in the output path, check all of the resistors and capacitors on the TPS40422 (as well as the solder joints) to make sure they are all correct. After all of this is done, then restart the procedure over and check to make sure the changes have fixed the issue. 8.2 Part 1 Program Failures If part 1 of the test program fails, this section describes how to troubleshoot the issue. The reason that the SAT0003 board fails, is because the currents and voltages are out of the correct operating ranges. Another reason for the failure of part 1 is that there could be an issue with the PMBus communication. Check the following - Ensure that the R68 and R69 are 10K Ohms. - Check to make sure that there is 12V present at the input TP1 and TP2. - Ensure that the proper output voltages of Vout1 and Vout2 Vout1 = V Vout2 = V - Ensure that the output resistor connector across each terminal is 2 Ohms. After ensuring that all of these values have been corrected rerun the MSP430 program by pressing the RESET button on the MSP430 and start with Procedure number one. 8.3 Part 2 Program Failures If you have reached Part 2 of the test procedure and had a failure, this would be the section explaining how to troubleshoot the issue. The reason for a failure at this section of the procedure would be because the programmable on-board load is not operating within range. Start by check the following items. - Ensure that the connections on the jumper shunt for J8 and J10 are configured as seen below. Scott McElroy Page 14 of 15 April 23, 2013

15 - Ensure that the programmable load is functioning properly by taking a thermal image of the region seen below. THIS SECTION OF THE BOARD WILL BE HOT AND SHOULD BE IF FUNCTIONING CORRECTLY. - Check with the schematics and ensure that the proper resistors got placed on each of the programmable loads and that none of them are missing. - Desolder and measure each and every resistor to ensure that the values are correct with a digital multimeter set to Ohms. - Ensure that all of the components for the programmable load are soldered correctly, including the bi-polar transistors for Vout1 and Vout2. - If all other options fail, try using a new MSP430 board with the test-program installed. After testing the board for these options, restart the MSP430 program (by pressing the RESET Button on the Launchpad) and run through the procedures from the beginning again. 9 Conclusion This documentation is to ensure that the SAT0003 board is up and running properly. If each board passes the test program for both the external load and the on-board load, then they are within range of operation and will qualify to be released. Scott McElroy Page 15 of 15 April 23, 2013