AN-2070

AVS Adaptor Board for USB AVS System Mainboards AVS Adaptor Board for USB AVS System Mainboards National Semiconductor Application Note 2070 Michael Drake August 4, 2010 AVS Adaptor Board for USB AVS System Mainboards The AVS Adaptor Board (AAB) is not intended for standalone use, but rather to enable interconnect of non-PEK/SPEK footprint daughterboards to National’s PowerWise/SPMI System Mainboards. The AAB provides a means to plug in National evaluation boards with the modified DOSA style connector, the proprietary MAK style connector, or the standard 1x9 SIP interface. The AAB provides various power supply options for bench evaluation, and several jumper options to support the desired setup. signals from the system mainboard and/or bench equipment to the DUT. The only active circuitry on the board is a lowpower LDO which can be used to provide the PWI/SPMI I/O signaling voltage. Because of the flexibility designed into the board, the user must be very careful with the jumper set-up of the board stack to ensure no damage is done to any of the circuitry. While it would be impossible to cover all combinations of board stacks, great effort will be taken to provide a method/procedure to ensure that the boards can be configured without damaging anything. Evaluation Board Overview The AAB is, for the most part, a passive board. The vast majority of its functionality is to appropriately route power and 30127001 FIGURE 1. AVS Adaptor Board AN-2070 © 2010 National Semiconductor Corporation 301270 www.national.com AN-2070 LM10000 Evaluation Board Quick Start A typical set up using AAB requires a National Semiconductor AVS System Mainboard, the AAB, and a compliant evaluation board to make up the board stack. The board is driven from a PC with a GUI that is tailored to the evaluation board and DUT. The system mainboard connects to the PC via USB. The board stack can be entirely standalone and powered from USB for quick evaluation/demo purposes, or can be powered from a bench supply for more thorough testing of the regulator (s). BASIC SETUP 1. Set the appropriate jumpers for power supply on the chosen system board. Details of the supply can be found in the documentation for that National system board. Jumper Purpose 2. 3. 4. 5. Plug the AAB into the system board.. Set the jumpers on the AAB per the following tables. Plug the DUT board into the AAB. Follow the associated documentation for the device you are working with as to power up sequence and special GUI considerations. As a general rule though, you want any external/bench supplies to be on prior to plugging in the USB cable. 6. Plug in the USB cable of the National system board and follow the documentation pertaining to that device and GUI. There are many jumper options on the AAB to allow it to perform in as many roles as possible. Great care must be taken in setting up the jumpers prior to applying power to avoid damaging the boards in the board stack. The jumpers and their purpose is explained here: Note JP1 1-2: AVIN is supplied via the system Selects the power source for AVIN. mainboard's "VBAT” input; DEFAULT. AVIN is typically used to power the 2-3: AVIN is supplied via the YELLOW banana power supply's control electronics. jack on the AAB. Selects the power source for PVIN. PVIN is typically used to power the power electronics of the power supply. 1-2: PVIN is supplied via the system mainboard's "VBAT” input; DEFAULT. 2-3: PVIN is supplied via the RED banana jack on the AAB. JP2 JP3 (+Sense) and JP4 (-Sense) 1-2: The regulated sense point will be based on the remote sense points labeled "Sense” in Selects either local feedback for the the silkscreen. sense lines or remote sense. 2-3: The regulated sense point for the supply will occur at the WHITE banana jack; DEFAULT. ENABLE pull-up/pull-down strap. 1-2: ENABLE is pulled-up to AVIN via 10K. 2-3: ENABLE is pulled-down to GND via 10K. 1-2: Referenced to the "VBAT” supply from the system board; depends on what that supply is set to. 2-3: Referenced to the same voltage as the PWI/SPMI signals, "VPWI”; DEFAULT. On: With the jumper installed, the LED indicators will be functional; DEFAULT. Off: LEDs are disabled. On: U1, the "VPWI” LDO will be shorted. This will make "VPWI” equal to the system board "VBAT”. Off: “VPWI” can be generated on-board or elsewhere; DEFAULT. 1-2: “VPWI” LDO is enabled; DEFAULT. 2-3: “VPWI” LDO is disabled. 1-2: 3.3V; DEFAULT. 3-4: 2.5V. 5-6: 1.8V. JP5 JP6 Selects the PWI/SPMI sideband (signals other than the 2-wire data and clock) I/O level reference. LED supply On/Off. The LEDs are powered from the system board "VBAT”. JP7 JP8 Short out on-board "VPWI” regulator. JP9 'VPWI” regulator On/Off. 'VPWI” regulator output voltage selection. JP10 www.national.com 2 AN-2070 INTERCONNECTS There are several ways to connect to/from the AAB board. The board will nearly always be paired with a system mainboard that will connect via P1, P2, and P3. These are male pin headers on the bottom side of the board that allow the board to plug down into the standard mainboard footprint. The AAB itself then breaks out the required power and signal traces to the appropriate locations on the interconnects. DOSA Pin Number 1 2 3 4 5 AAB Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 A 6 7 8 B 9 10 13 14 15 16 17 18 19 J1 is the modified DOSA-style interconnect. It leverages the DOSA Standard for Non-Isolated 9.6 – 14.4VIN, 15/16/20A DC/DC Converters. It is completely backwards compatible with existing DOSA style parts, but expands upon the connector footprint to add in PWI/SPMI functionality. The pinout is in the below table: Function VOUT VOUT SENSE VOUT GND GND GND Mechanical Key SCLK SPWI VPWI AVIN PGOOD I Share - Not Routed GND VIN VIN SEQ - Not Routed TRIM - Not Routed ON/OFF years. It allows a convenient means to access most of the major signals involved in the PWI/SPMI interface, and can also be used to cable across to an external AVS setup to provide the proper signaling environment. The P4 pinout is found in the following table: J2 is the “MAK” connector that is utilized to connect to a few National DUT boards. It is a vertical edge-card socket strip. Its use is relegated to a couple of very specific applications and will not be detailed here. The user is urged to reference the schematics and the DUT documentation for further details. The last major connector is P4. This 1x9 SIP connector has been on the vast majority of National AVS products for several Pin Number 1 2 3 4 5 6 7 8 9 GND VPWI SCLK SPWI ENABLE RST# PWROK VBAT GND Function Description System ground VPWI voltage Serial clock Serial data Regulator enable Regulator reset (active low) Regulator output of power okay indicator Mainboard “VBAT” voltage System ground 3 www.national.com AN-2070 INDICATOR LEDS When JP7 is ON and the indicator LEDs are enabled, they have the following functionality: Ref Des D1 D2 D3 1. Red Yellow Green Color AVIN is powered up VPWI is powered up The PWROK signal is driven high 2. If “VPWI” is provided externally by the user in some fashion, care should be taken to disable U1 (set JP9 to 2-3) and open JP8. Additionally, the user should make sure that the provided “VPWI” does NOT exceed the mainboard “VBAT” by more than 1 diode drop or current may flow from “VPWI” to “VBAT”. “VBAT” is dependent upon the system board used and the settings applied to it. Description R26 and R27 can be used either as a voltage divider for the output voltage or as a RC for the ADC converter on the system mainboard. By default, R26 is shorted and R27 is open, but the user can mount these as desired. The user must ensure that the VOUT fed back to the mainboard does NOT exceed 3.3V for the USB Interface Board or 1.8V for the PEK/SPEK. VOUTs above this should be divided down to appropriate levels. www.national.com 4 AN-2070 Bill of Materials Designator AVIN C1 C2 C3 D1 D2 D3 GND, GND2, GND3 J1 J1-Key J2 JP7, JP8 JP10 P1, P2, P3 P4 PVIN Q1, Q2, Q3 R1, R22, R34, R35 R2, R3 R4, R9 R5, R6, R7, R8, R10, R11, R12, R15, R16, R17, R18, R19, R20, R21, R23, R24, R25, R26 R13, R14, R27 R28 R29, R30, R31 R32 R33 R36 TP1, TP2 U1 VOUT Jumper Shunts -- Installed Per Golden Sample Value Yellow Banana Jack 1µF/35V/X7R 2.2µF/10V/20%/Tant 7pF/50V/C0G LS L29K-H1J2-1-Z LY L29K-J1K2-26-Z LG L29K-G2J1-24-Z Black Banana Jack DOSA Receptacle DOSA Receptacle Key Samtec HSEC8 1x2, 100-mil Header 2x3, 100-mil Header A28694-ND 1x9, 100-mil Header Red Banana Jack NDS331N 10R/0.25W/5% 1.5K/0.1W/1% 10K/0.1W/1% 0R/0.25W No Load 53.6K/0.1W/1% 1.6K/0.1W/1% 86.6K/0.1W/1% 24.0K/0.1W/1% 51.1K/0.1W/1% No Load LP2980IM5-ADJ White Banana Jack 1x2 Shunt Description Yellow Nylon Banana Jack VPWI CIN VPWI COUT VPWI Feedback Bypass Red LED for AVIN Indicator Yellow LED for VPWI Indicator Green LED for PGOOD Indicator Black Nylon Banana Jack 1x20 100-mil Receptacle Key to make pin 8 inaccessible MAK Connector Receptacle 1x3 100-mil Jumper 1x2 100-mil Jumper VPWI Voltage Select Jumper Baseboard Connectors 1x9 PWI Access Header Red Nylon Banana Jack Logic NFET Fuse Rs Presence Detect Rs ENABLE P-U/P-D Pad shorts Open pads 2.5V VPWI Divider R LED Current Limit R 3.3V VPWI Divider R 1.8V VPWI Divider R LS VPWI Divider R Remote Sense pads VPWI Adjust LDO White Nylon Banana Jack Jumper Qty. 1 1 1 1 1 1 1 3 1 1 1 7 2 1 3 1 1 3 4 2 2 18 3 1 3 1 1 1 2 1 1 9 Mfg. P/N Emerson 108-0907-001 T-Y GMK212B7105KG-T Nichicon F931A225MAA TDK C1608C0G1H070D OSRAM LS L29K-H1J2-1-Z OSRAM LY L29K-J1K2-26-Z OSRAM LG L29K-G2J1-24-Z Emerson 108-0903-001 Tyco 6-534237-8 Tyco 86286-1 Samtec HSEC8-125-01-S-DV-A Molex 90120-0763 Molex 90120-0762 Molex 90131-0763 Tyco 1-87227-3 Molex 90120-0769 Emerson 108-0902-001 Fairchild NDS331N Rohm ESR10EZPJ100 Rohm MCR03EZPFX1501 Stackpole RMCF 1/16 10K 1% R Vishay CRCW12060000Z0EA N/A Panasonic ERJ-3EKF5362V Yageo RC0603FR-071K6L Panasonic ERJ-3EKF8662V Panasonic ERJ-3EKF2402V Panasonic ERJ-3EKF5112V N/A National Semi LP2980IM5-ADJ Emerson 108-0901-001 Sullins SPC02SYAN JP1, JP2, JP3, JP4, JP5, JP6, JP9 1x3, 100-mil Header 5 www.national.com AN-2070 Layout Artwork 30127001 FIGURE 2. Evaluation Board (Top View) www.national.com 6 AN-2070 30127009 FIGURE 3. Top Layer 30127010 FIGURE 4. Mid-Layer 1 7 www.national.com AN-2070 30127011 FIGURE 5. Mid-Layer 2 30127012 FIGURE 6. Bottom Layer www.national.com 8 AN-2070 30127002 FIGURE 7. Top Silk Screen 30127013 FIGURE 8. Bottom Silk Screen 9 www.national.com AVS Adaptor Board for USB AVS System Mainboards Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers Audio Clock and Timing Data Converters Interface LVDS Power Management Switching Regulators LDOs LED Lighting Voltage References PowerWise® Solutions Temperature Sensors PLL/VCO www.national.com/amplifiers www.national.com/audio www.national.com/timing www.national.com/adc www.national.com/interface www.national.com/lvds www.national.com/power www.national.com/switchers www.national.com/ldo www.national.com/led www.national.com/vref www.national.com/powerwise WEBENCH® Tools App Notes Reference Designs Samples Eval Boards Packaging Green Compliance Distributors Quality and Reliability Feedback/Support Design Made Easy Design Support www.national.com/webench www.national.com/appnotes www.national.com/refdesigns www.national.com/samples www.national.com/evalboards www.national.com/packaging www.national.com/quality/green www.national.com/contacts www.national.com/quality www.national.com/feedback www.national.com/easy www.national.com/solutions www.national.com/milaero www.national.com/solarmagic www.national.com/training Applications & Markets Mil/Aero PowerWise® Design University Serial Digital Interface (SDI) www.national.com/sdi www.national.com/wireless www.national.com/tempsensors SolarMagic™ THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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