TPS23861EVM-612

User's Guide SLUUAY8E – March 2014 – Revised April 2018 TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 This user’s guide describes the evaluation modules (EVM) for the TPS23861 (TPS23861EVM-612). The EVM contains evaluation and reference circuitry for the TPS23861. The TPS23861 is a Power-overEthernet (PoE) device for power sourcing equipment (PSE). Contents 1 Description .................................................................................................................... 3 2 Quick Start .................................................................................................................... 3 3 General Use Features ....................................................................................................... 8 4 TPS23861EVM-612 PI Commander GUI Setup ....................................................................... 10 5 EVM Schematic, Layout Guidelines and PCB Assembly, Layer Plots .............................................. 26 6 Bill of Materials ............................................................................................................. 34 Appendix A Revision A Schematic ............................................................................................ 37 List of Figures 1 Basic Test Setup ............................................................................................................. 5 2 Basic Setup Using USB-TO-GPIO 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 ........................................................................................ 6 Advanced Setup Using LaunchPad ....................................................................................... 7 PI Commander Device Menu Window .................................................................................. 10 PI Commander Device Selection Window .............................................................................. 10 Devices Found in Scan .................................................................................................... 11 Detected Devices Selection............................................................................................... 11 Device Selector Approval ................................................................................................. 11 Telemetry Page............................................................................................................. 12 PD Detection ................................................................................................................ 13 Telemetry Data Collection and Graphs.................................................................................. 14 Telemetry Data Collection and Graphs, Device 2 ..................................................................... 15 High-Level Status, 2 Devices ............................................................................................. 15 I2C Register Page.......................................................................................................... 16 Device Configuration Page ............................................................................................... 17 Configuration Wizard ...................................................................................................... 17 Hit 'S' to Start ............................................................................................................... 18 Program Started ............................................................................................................ 19 Terminal Response with Connected Ports .............................................................................. 19 TPS23861 POE Documentation ......................................................................................... 20 Overall System Software Structure ...................................................................................... 21 Power on Decision Flow Chart ........................................................................................... 23 System Power Monitor Flow Chart....................................................................................... 24 TPS23861EVM-612 (Motherboard) Schematic: Control .............................................................. 26 TPS23861EVM-612 (Motherboard) Schematic: Power Ports ........................................................ 27 TPS23861EVM-613 (Daughterboard) Schematic ...................................................................... 28 TPS23861EVM-612 (Motherboard) Top Side Assembly .............................................................. 29 SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 Copyright © 2014–2018, Texas Instruments Incorporated 1 www.ti.com 28 TPS23861EVM-612 (Motherboard) Top Side Routing ................................................................ 30 29 TPS23861EVM-612 (Motherboard) Layer 2 Routing .................................................................. 30 30 TPS23861EVM-612 (Motherboard) Layer 3 Routing .................................................................. 31 31 TPS23861EVM-612 (Motherboard) Bottom Side Routing ............................................................ 31 32 TPS23861EVM-613 (Daughterboard) Top Side Assembly ........................................................... 32 33 TPS23861EVM-613 (Daughterboard) Top Side Routing 34 35 36 ............................................................. TPS23861EVM-613 (Daughterboard) Bottom Side Routing ......................................................... TPS23861EVM-613 (Daughterboard) Bottom Side Assembly ....................................................... TPS23861EVM-612 (Motherboard) Schematic: Control .............................................................. 32 33 33 37 List of Tables .............................................................. 1 TPS23861EVM-612 Voltage Rail Current Requirements 2 EVM Input/Output Connectors ............................................................................................. 8 3 EVM LEDs .................................................................................................................... 8 4 EVM Test Points ............................................................................................................. 9 5 EVM Jumpers ................................................................................................................ 9 6 Terminology ................................................................................................................. 22 7 State Definitions ............................................................................................................ 22 8 Function Definitions ........................................................................................................ 22 9 User Configurable Parameters ........................................................................................... 23 10 TPS23861EVM-612 Bill of Materials 11 TPS23861EVM-613 Bill of Materials..................................................................................... 35 .................................................................................... 4 34 Trademarks LaunchPad, Code Composer Studio are trademarks of Texas Instruments. 2 TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback Copyright © 2014–2018, Texas Instruments Incorporated Description www.ti.com 1 Description The TPS23861EVM-612 features the quad port, TPS23861, IEEE 802.3at PoE PSE controller. The EVM consists of a motherboard (TPS23861EVM-612) and daughter board (TPS23861EVM-613) containing two TPS23861 devices. The TPS23861EVM-612 provides a multi-port base platform interface for TPS23861EVM-613, MSP-EXP430G2 (LaunchPad™), and USB-TO-GPIO (USB Interface Adapter). 1.1 Features • • • • • • • • • 1.2 TPS23861 PSE devices default to auto-mode operation so no operator interface over I2C is required. Four IEEE802.3at, Type 2 (30 W) ports with 1000BASE-T (gigabit Ethernet data pass through) Two non-standard, high power ports with 1000BASE-T (gigabit Ethernet data pass through) Fully certified using UNH-IOL Clause #33 PSE Conformance Test Suite Single DC power supply input On board 3.3-V regulator On board I2C interface to both TPS23861PW devices from either USB-TO-GPIO or MSP-EXP430G2. Port ON status LEDs User test points Applications • • • • Ethernet switches and routers Surveillance VDRs High power PoE PoE pass-through systems 2 Quick Start 2.1 Input Power 2.1.1 Input Power (Labeled VPWR) DC input voltage is provided through J1 (screw jack). A dc power supply or laptop adapter with sufficient current capacity can power the EVM. CAUTION Reverse voltage protection is not provided; ensure that the correct polarity is applied to J1. This dc input is labeled VPWR in the schematics and is used for port VBUS as well as for the TPS23861 devices. The VPWR connections to the PoE ports are not fused. Each two pair port is capable of furnishing at least 30 W and each four pair port can furnish 60 W. The power supply requirements are summarized in Table 1. The minimum PSE port voltage is 44 VDC for type 1 and 50 V for type 2. The nominal dc voltage at VPWR is 48 VDC for a type 1 and 54 VDC for a type 2. During evaluation, choose the appropriate dc power supply for the type 1 or type 2 environment. 2.1.2 Local 3.3 V (Labeled 3.3V) Local 3.3 V for local devices (labeled as 3.3V) is provided by the on-board LM5019 buck converter. The LM5019 provides a basic power-on sequence and provides a well-controlled and consistent startup in order to prevent erratic operation. This is described in detail in SLVA723. In addition to 48 V, the TPS23861 requires 3.3 V for the digital circuitry and this is routed up to TPS23861EVM-613 over the connector interface. The current consumption is 25-mA typical and 30-mA maximum. SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 Copyright © 2014–2018, Texas Instruments Incorporated 3 Quick Start 2.1.3 www.ti.com External 3.3 V (Labeled 3.3V_USB) The TPS23861EVM-612 provides galvanic isolation between PoE power side and host side using digital isolators (ISO7241CD). The host side power is provided either from J2 (from USB-TO-GPIO) or J5 (from LaunchPad). The current consumption is 3-mA typical and 5-mA maximum. CAUTION Do not use USB-TO-GPIO and LaunchPad simultaneously. Table 1. TPS23861EVM-612 Voltage Rail Current Requirements 2.2 Voltage Rail Typical (mA) 3.3V_USB 2.5 Maximum (mA) 3 3.3V 25 30 VPWR (Miscellaneous) 35 57 VPWR (8x Type 1 Output Ports) 2992 3142 VPWR (8x Type 2 Output Ports) 5160 5418 VPWR Total (8x Type 1 Ports) 3027 3202 VPWR Total (8x Type 2 Ports) 5195 5478 PoE Port Interfaces The TPS23861 devices are pre-configured to operate in auto mode and, as such, no external communication interface is required to enable or configure the TPS23861EVM-612. A standard PD can be plugged into ports 1–4 and be expected to operate automatically. 2.2.1 Standard 30 W, IEEE802.3at Type 2 ports Four standard ports are provided at J19, J20, J8, and J7 for two pair ports 1, 2, 3, and 4 respectively. The power furnished is according to alternative A with MDI-X polarity. 2.2.2 Nonstandard 60-W Ports Two non-standard ports are provided at J21 and J9 for four pair ports 1 and 2, respectively. The power furnished is according to alternative A with MDI-X polarity and alternative B on a single port connector. A standard PD may not power on at this interface, but a PD which can process power on all of the Ethernet conductors (refer to TI application report, SLVA625) can power on and consume up to 60 W. 2.3 I2C Interfaces Two I2C interfaces to the TPS23861 are provided on the EVM. 2.3.1 USB-TO-GPIO J2 provides an interface with the USB-TO-GPIO adapter when using a PC and GUI. 2.3.2 MSP-EXP430G2 J3, J4, and J5 provide an interface with the MSP-EXP430G2 or LaunchPad when using a PC to develop custom power management code. 4 TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback Copyright © 2014–2018, Texas Instruments Incorporated Quick Start www.ti.com 2.4 Basic Test Setup (Out-of-the-box Auto-Mode Operation) Figure 1 shows the basic test setup for the TPS23861EVM. All that is required is a dc power supply (44–57 VDC, 5 A), Ethernet patch cable, and any PD load. TPS23754EVM-420 J7 J8 J20 J19 J9 J21 Ethernet Cable TPS23861EVM-612 J2 J1 (-) (+) D1 TPS23861EVM-613 Positive Negative Power Supply Figure 1. Basic Test Setup SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 Copyright © 2014–2018, Texas Instruments Incorporated 5 Quick Start 2.5 www.ti.com 2 Basic Test Setup Using USB-TO-GPIO for I C Interface (Auto-Mode Operation with I2C Monitoring) An I2C interface is provided through J2 to the TPS23861PW devices on the TPS23861EVM-613. The USB-TO-GPIO adapter (not included) can be used with any TI GUI which uses USB-TO-GPIO to read and write over an I2C bus. Figure 2 illustrates the basic setup using USB-TO-GPIO. TPS23754EVM-420 J7 J8 J20 J19 J9 J21 Ethernet Cable J2 (-) J1 (+) TPS23861EVM-613 D1 TPS23861EVM-612 Ribbon Cable x Positive x Negative x USB-to-GPIO Power Supply x x PC USB CABLE Figure 2. Basic Setup Using USB-TO-GPIO 6 TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback Copyright © 2014–2018, Texas Instruments Incorporated Quick Start www.ti.com 2.6 Advanced Test Setup Using MSP-EX430G2 (LaunchPad) The LaunchPad (not included) running a custom software program can communicate with the TPS23861PW devices on the TPS23861EVM-613. Figure 3 shows the advanced setup using LaunchPad. TPS23754EVM-420 J7 J8 J20 J19 J9 J21 Ethernet Cable TPS23861EVM-613 D1 TPS23861EVM-612 J2 (-) J1 (+) MSP-EXP430G2 USB CABLE Positive x x Negative x x x Power Supply PC Figure 3. Advanced Setup Using LaunchPad SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 Copyright © 2014–2018, Texas Instruments Incorporated 7 General Use Features www.ti.com 3 General Use Features 3.1 EVM Input/Output Connectors and Switches Table 2 lists the EVM input and output connectors. Table 2. EVM Input/Output Connectors 3.2 Connector/Switch Label Description J1 J1 DC power supply screw jack. (44–57 VDC, 5 A). Use a 48 VDC (nominal) for type 1 and 54 VDC (nominal) for type 2 PSE operation. J2 J2 Ribbon cable connection to USB-TO-GPIO adapter J3 J3 LaunchPad Control (mates with LaunchPad J1) J4 J4 LaunchPad I2C (mates with LaunchPad J2) J5 J5 LaunchPad Power (mates with LaunchPad J6) J6 J6 TPS23861EVM-613 Control (mates with TPS23861EVM-613 J3) J17 J17 TPS23861EVM-613 Port 5-8 (mates with TPS23861EVM-613 J2) J18 J18 TPS23861EVM-613 Port 1-4 (mates with TPS23861EVM-613 J1) J22 J22 Two-pair port 1 data only J19 2 Pair Port 1 Two-pair port 1 power and data J23 J23 Two-pair port 2 data only J20 2 Pair Port 2 Two-pair port 2 power and data J11 J11 Two-pair port 3 data only J8 2 Pair Port 3 Two-pair port 3 power and data J10 J10 Two-pair port 4 data only J7 2 Pair Port 4 Two-pair port 4 power and data J24 J24 Four-pair port 1 data only J21 4 Pair Port 1 Four -pair port 1 power and data J12 J12 Four -pair port 2 data only J9 4 Pair Port 2 Four -pair port 2 power and data J29 J29 Chassis ground tie point EVM LEDs Table 3 lists the EVM LEDs and their descriptions. Table 3. EVM LEDs 8 LED Color Label Description D1 GREEN 48V 48-V ON indicator D16 BLUE D16 Two-pair port 1 power is ON. For J19 supplier #1 (see the bill of materials (BOM)), J19 internal port LED is active. For supplier #2, D16 is active. D17 BLUE D17 Two-pair port 2 power is ON. For J20 supplier #1 (see the BOM), J20 internal port LED is active. For supplier #2, D17 is active. D13 BLUE D13 Two-pair port 3 power is ON. For J8 supplier #1 (see the BOM), J8 internal port LED is active. For supplier #2, D13 is active. D12 BLUE D12 Two-pair port 4 power is ON. For J7 supplier #1 (see the BOM), J7 internal port LED is active. For supplier #2, D12 is active. D18 BLUE D18 Four-pair port 1A power is ON. For J21 supplier #1 (see the BOM), J21 internal port LED is active. For supplier #2, D18 is active. D14 BLUE D14 Four-pair port 2A power is ON. For J9 supplier #1 (see the BOM), J9 internal port LED is active. For supplier #2, D14 is active. TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback Copyright © 2014–2018, Texas Instruments Incorporated General Use Features www.ti.com 3.3 EVM Test Points Table 4 lists and describes the EVM test points. Table 4. EVM Test Points TP Color Label Description Motherboard: TPS23861EVM-612 TP1 RED VPWR Used for VPWR TP2 RED 3.3V Used for TPS23861 VDD TP3 SMT GND VPWR ground TP4 WHT SDA I2C Data from LaunchPad and USB-TO-GPIO TP5 WHT SCL I2C Clock from LaunchPad and USB-TO-GPIO TP6 WHT PSE_SDAO I2C data out from TPS23861 TP7 WHT PSE_SCL I2C clock to TPS23861 TP8 WHT PSE_SDAI I2C data in to TPS23861 TP9 BLK GND1 Ground from LaunchPad and USB-TO-GPIO TP11 SMT TP11 Chassis ground test point TP14 SMT GND VPWR ground test point TP15 SMT GND VPWR ground test point TP16 SMT GND VPWR ground test point Daughterboard: TPS23861EVM-613 3.4 TP4 RED 2P4D Two-pair port 4 DRAIN TP12 WHT 2P4G Two-pair port 4 GATE TP5 WHT 4P1AG Four-pair port 1A GATE TP6 RED 4P1AD Four-pair port 1A DRAIN TP9 WHT 4P1BG Four-pair port 1B GATE TP10 RED 4P1BD Four-pair port 1B DRAIN TP1 BLK GND VPWR ground TP8 SMT GND VPWR ground EVM Test Jumpers The EVM is equipped with shunts on the jumper positions identified in Table 5, in the Default Pin Position column. Shunts can be moved and removed, as required, during use. Table 5. EVM Jumpers (1) Jumper Default Pin Position Label Description J27 1-2 P1 Two-pair port 1 LED bias J28 1-2 P2 Two-pair port 2 LED bias J16 1-2 P3 Two-pair port 3 LED bias J15 1-2 P4 Two-pair port 4 LED bias J26 1-2 P5 Four-pair port 1A LED bias J25 1-2 P6 Four-pair port 1B LED bias J14 1-2 P7 Four-pair port 2A LED bias J13 1-2 P8 Four-pair port 2B LED bias (1) Remove the jumpers listed in this table when doing SIFOS or UNH DC MPS testing. SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 Copyright © 2014–2018, Texas Instruments Incorporated 9 TPS23861EVM-612 PI Commander GUI Setup 4 TPS23861EVM-612 PI Commander GUI Setup 4.1 TPS23861EVM-612 GUI Installation www.ti.com The Texas Instruments PI Commander graphical user interface (GUI) can be used with TPS23861EVM612 to provide real time feedback on port telemetry. PI Commander (PI Commander - TPS23861setup.exe) can be downloaded from the TPS23861 product page in the Software section. Follow the onscreen instructions to complete the installation. PI Commander uses the USB-TO-GPIO as an interface between the PC USB port and TPS23861EVM-612 J2 connector (I2C interface). Before starting PI Commander, make sure the USB-TO-GPIO is properly connected to TPS23861EVM-612 as shown in Figure 2. 4.2 TPS23861EVM-612 GUI Operation Start Texas Instruments PI Commander - TPS23861 by clicking START → All Programs → Texas Instruments → PI-Commander-n.n.n-n, then PI-Commander-PoE. A command window opens as the program starts and scans for devices (note that the Scanning for devices …. message displays in the window footer until the scan is complete). Once the scan is complete, click on the UNKNOWN 30 device (Figure 4). Figure 4. PI Commander Device Menu Window TPS23861 shows up in the Device Selector window. Click the OK button. Figure 5. PI Commander Device Selection Window 10 TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback Copyright © 2014–2018, Texas Instruments Incorporated TPS23861EVM-612 PI Commander GUI Setup www.ti.com As the program GUI starts, the window in Figure 6 appears showing the devices found in the scan. Device #1 (two-pair ports 1-4) is at address 20 and device #2 (four-pair ports 1 and 2) is at address 28. Click the OK button. Figure 6. Devices Found in Scan Choose device #1 (UNKNOWN 20) or device #2 (UNKNOWN 28). Figure 7. Detected Devices Selection Once the following window pops up, click the OK button. Figure 8. Device Selector Approval SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 Copyright © 2014–2018, Texas Instruments Incorporated 11 TPS23861EVM-612 PI Commander GUI Setup www.ti.com PI Commander launches and starts the Telemetry Page as shown in Figure 9 for device #1. Note that more than one device window can be opened at the same time by choosing another device from the device menu. Figure 9. Telemetry Page 12 TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback Copyright © 2014–2018, Texas Instruments Incorporated TPS23861EVM-612 PI Commander GUI Setup www.ti.com At any time, insert the ethernet cable connected to the PD load device into the two-pair port jacks. For the case in Figure 10, type two PDs are installed into ports 1, 2, 3, and 4 respectively and are successfully detected, classified, and powered up. Figure 10. PD Detection SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 Copyright © 2014–2018, Texas Instruments Incorporated 13 TPS23861EVM-612 PI Commander GUI Setup www.ti.com Clicking the Run button (blue arrow in the header bar) starts telemetry data collection and graphs (Figure 11). Figure 11. Telemetry Data Collection and Graphs 14 TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback Copyright © 2014–2018, Texas Instruments Incorporated TPS23861EVM-612 PI Commander GUI Setup www.ti.com Following a similar procedure, device #2 can be viewed. For the case in Figure 12, two forced-four pair PDs are installed into ports 1 and 2 respectively and are successfully detected, classified, and powered up. Figure 12. Telemetry Data Collection and Graphs, Device 2 The Dashboard window is also available showing a high level status (two devices shown). Figure 13. High-Level Status, 2 Devices SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 Copyright © 2014–2018, Texas Instruments Incorporated 15 TPS23861EVM-612 PI Commander GUI Setup www.ti.com The I2C Register Page (Figure 14) provides a detailed view of Status, Device, and Telemetry information. Figure 14. I2C Register Page 16 TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback Copyright © 2014–2018, Texas Instruments Incorporated TPS23861EVM-612 PI Commander GUI Setup www.ti.com The Device Configuration Page provides users with an additional level of access. Figure 15. Device Configuration Page The Configuration Wizard provides a quick way to set up ports in semi-auto or manual modes without much knowledge of the device register-specific details. Figure 16. Configuration Wizard SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 Copyright © 2014–2018, Texas Instruments Incorporated 17 TPS23861EVM-612 PI Commander GUI Setup 4.3 www.ti.com MSP-EXP430G2 Details The TPS23861EVM-612 accepts the MSP-EXP430G2 evaluation module when the application requires management of the TPS23861 devices with an external controller. Before inserting the MSP-EXP430G2 into the TPS23861EVM-612, make the following jumper changes and ensure that the target MSP430 (MSP430G2553) device is installed: 1. Remove the shunt on J5 in the P1.6 slot 2. Remove the shunts on J3 in the RXD and TXD slot. Re-install these in the vertical position as described in the MSP-EXP430G2 LaunchPad user guide (SLAU318C, page 10). 3. Install MSP-EXP430G2 onto TPS23861EVM-612 and ensure that the USB-TO-GPIO ribbon cable is NOT installed into J2 4. Connect the PC to the LaunchPad as shown in Figure 3. 5. The source code was developed for the MSP430 LaunchPad Development Kit (MSP-EXP430G2 http://www.ti.com/tool/msp-exp430g2) using the Code Composer Studio™ (CCS) version 5.3 (http://www.ti.com/tool/ccstudio-msp430) development environment. The target MSP430 can be programmed within this environment. 6. Once CCS is installed, then use the basic set of instructions listed in Section 4.3.1 to import, build, and run the project. CCS version 5.3.0 is used in the following examples. Note that a terminal program such as HyperTerminal or Teraterm is required to view the output from the EVM when it is running. 4.3.1 Basic CCS and Terminal Setup 1. Launch the CCS program on the PC: Start → Texas Instruments → Code Composer Studio 5.3.0 → Code Composer Studio 5.3.0. 2. OK the workspace location and CCS starts 3. Import the project: File → Import Existing CCS Eclipse Project 4. Navigate to the project location, then click the Finish button 5. Set the active project: Project, Build Configurations, Set Active, Auto, Manual, or Semi-Auto 6. Build the project by clicking the hammer symbol 7. Launch debug session from CCS to activate the current project: Run, Debug (or F11). 8. Run the active project: Run, Resume (or play button, F8) 9. Determine the PC COM port connected to the LaunchPad by going into the Device Manager Ports (COM and LPT) section. Launch the terminal program. 10. Once the terminal program is properly connected to the LaunchPad running the POE firmware, then text similar to the following image appears Figure 17. Hit 'S' to Start 18 TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback Copyright © 2014–2018, Texas Instruments Incorporated TPS23861EVM-612 PI Commander GUI Setup www.ti.com 11. Pressing the “S” key on the keyboard starts the program Figure 18. Program Started 12. The TPS23861EVM-612 is now waiting for a PD load to be installed. As ports are installed, the firmware automatically detects, classifies, and powers up the port as shown in the following image. Port status is updated on the screen approximately every 8 seconds Figure 19. Terminal Response with Connected Ports 13. In similar fashion, the builds for Semi-auto and auto mode operation can be configured and launched. The terminal welcome screen indicates which build is running on the LaunchPad. SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 Copyright © 2014–2018, Texas Instruments Incorporated 19 TPS23861EVM-612 PI Commander GUI Setup 4.3.2 www.ti.com Documentation Figure 20 illustrates the documentation contained within the \POETPS23861\Document\doxy\html\index.html file. Figure 20. TPS23861 POE Documentation 4.4 4.4.1 MSP430 Reference Code Overview There are two versions of MSP430 reference code published on TI web. One is for basic applications and the other is focused on multi-port power management applications. The reference code for multi-port power management applications will be discussed in detail since it has more flexibility and complexity. The system software supports the following features: • Fully compliant to IEEE802.3at Power over Ethernet specification • Device detection and classification • DC disconnect • Multi-port power management The reference code can support PSE systems with up to 48 ports. It keeps track of all system level parameters as well as port level parameters for each TPS23861 device within the system. The main actions are interrupts triggered. As long as MSP430 receives an interrupt signal from TPS23861 devices, it checks the interrupt status and proceeds with related actions. The system software also keeps track of system and devices error conditions that occur, as well as any events that affect the port states. The MSP430 communicates with PC through UART, reporting port’s parameters and status. 20 TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback Copyright © 2014–2018, Texas Instruments Incorporated TPS23861EVM-612 PI Commander GUI Setup www.ti.com Figure 21. Overall System Software Structure 4.4.2 Multi-Port Power Management Module Multi-Port Power Management methods are used to manage the distribution and prioritization of PDs. Power Management itself is not defined by the IEEE specification. Instead, it is a policy that takes advantage of the POE specification as it defines such terms as port and system power. The goals of Multi-Port Power Management in a POE enabled system are two-fold: • Power as many PDs as possible • Limit power cycling of PDs In many systems, the maximum system power available limits the total number of ports that may be powered. For example, each PD can draw a maximum of 30W, and a 48-port system can draw more than 1440W total system power. If the maximum system power available is less than 1440W then Power Management becomes necessary so that the available system power may be used in the most efficient manner while meeting the goals. In this reference code, Multi-Port Power Management Module is implemented in Semi-Auto Mode reference code (main_semi-auto.c). SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 Copyright © 2014–2018, Texas Instruments Incorporated 21 TPS23861EVM-612 PI Commander GUI Setup 4.4.2.1 www.ti.com Definitions and Formulas Table 6 defines terms used in the Power Management algorithm. Table 6. Terminology TERM DEFINITION sysPower The current total power consumed by PDs The estimated power the current port(finished detection and classification) is going to consume portPowerEstimate 4.4.2.2 lowestPrioPort The lowest priority port among all turned on ports powerOffPort Port will be powered off powerOnPort Port will be turned on State Definitions The Power Management algorithm operates as a state machine, whereby the algorithm is a certain state at any given point in time. Table 7 shows the state definitions for the algorithm. Table 7. State Definitions STATE DEFINITION PM_CHECK Calculate existing ON ports’ total power, get current port estimate power, compare total power + port estimate power and Power budget PM_POWERUP Power up current port PM_OVERLIMIT Power demand has exceeded the power budget. Calculate whether the remaining power is enough to turn on current port after turning off all lower priority ports PM_POWERDOWN 4.4.2.3 Power down the lowest priority port. Entered from PM_OVERLIMIT Function Definitions The power management function is called after a valid classification is performed. It includes the functions below to implement the algorithm. Table 8. Function Definitions FUNCTION 22 DEFINITION uint32_t PM_calSysPower(void) Calculate current total power consumed by PDs uint8_t PM_getActLowestPrioPort(void) Find lowest priority port among all turned on ports uint32_t PM_getPowerofPortsHigherPriority(uint8_t PM_sysPortNumber) Calculate total power of ports that have the same or higher priority uint32_t PM_getRequestPower(uint8_t PM_sysPortNumber) Get estimate power of current port(finished detection and classification) is going to consume based on classification results void PM_powerManagement(uint8_t PM_sysPortNumber) Power management function called in main function void PM_monitorSysPower(void) Note: running in background, software interrupt triggered Real-time check if current total power consumed by PDs exceeds power budget (to prevent load step change on any ports). TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback Copyright © 2014–2018, Texas Instruments Incorporated TPS23861EVM-612 PI Commander GUI Setup www.ti.com 4.4.2.4 User Configurable Parameters The PPM module gives user some flexibility to configure. Table 9shows the user configurable parameters. Table 9. User Configurable Parameters TERM 4.4.2.5 DEFINITION LOCATION #define PM_EN Enable PPM feature. Enable=1, disable=0. power_manage.h #define PM_POWER_BUDGET Total system power budget. Unit: mW power_manage.h #define NUM_OF_TPS23861 Total number of TPS23861 in the system system_init.h #define PM_POWER_MONITOR_TIMER The timer that host monitor the actual system power system_init.h #define The timer that host restart detection/ classification of the PM_DETECT_CLASS_RESTART_TIMER ports which are turned off system_init.h uint8_t i2cAddList[NUM_OF_TPS23861] I2C address of TPS23861s system_init.c TPS238x_On_Off_t autoMode[NUM_OF_TPS23861] AUTO bit setting of each TPS23861 system_init.c uint8_t PM_setPriority[NUM_OF_TPS23861 x PM_NUM_OF_PORT] The port priority setting of each port system_init.c Design Flow The Power Management algorithm is shown in Figure 22, in the form of a flow chart. Mode = PM_CHECK Is remaining power enough? Yes Mode = PM_POWERUP No Mode = PM_OVERLIMIT Is remaining power enough after turning off lowest priority ports? Yes Mode = PM_POWERDOWN No Figure 22. Power on Decision Flow Chart SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 Copyright © 2014–2018, Texas Instruments Incorporated 23 TPS23861EVM-612 PI Commander GUI Setup www.ti.com Real-time system power monitor to protect the system when step change happening on any ports (1s timer triggered): Calculate total actual system power Is total system power over power budget? Yes Power down lowest priority port No Figure 23. System Power Monitor Flow Chart 24 TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 SLUUAY8E – March 2014 – Revised April 2018 Submit Documentation Feedback Copyright © 2014–2018, Texas Instruments Incorporated TPS23861EVM-612 PI Commander GUI Setup www.ti.com 4.4.2.6 Pseudo-Code The Power Management algorithm can also be represented by the following pseudo-code. //This part is inserted after each port's successful classification if (Mode == Check) { Get RequesPortPower; Calculate SystemPower; if (systemPower + RequesPortPower > PowerBudget) { Mode = OverLimit; } else { Mode = PowerUP; } } if (Mode == OverLimit) { //If the remaining power is enough to turn on current port after powering down all ports that have lower priority, //then turn off the lowest priority port; otherwise, wait for the next cycle if (powerofHigherPriorityPorts + RequesPortPower