National Semiconductor Application Note 2070 Michael Drake August 4, 2010 AVS Adaptor Board for USB AVS System Mainboards 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. 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. 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 AVS Adaptor Board for USB AVS System Mainboards AVS Adaptor Board for USB AVS System Mainboards 30127001 FIGURE 1. AVS Adaptor Board AN-2070 © 2010 National Semiconductor Corporation 301270 www.national.com AN-2070 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: 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 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. JP2 Selects the power source for PVIN. PVIN is typically used to power the power electronics of the power supply. 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. JP5 ENABLE pull-up/pull-down strap. JP6 Selects the PWI/SPMI sideband (signals other than the 2-wire data and clock) I/O level reference. JP7 JP8 LED supply On/Off. The LEDs are powered from the system board "VBAT”. Short out on-board "VPWI” regulator. JP9 'VPWI” regulator On/Off. JP10 'VPWI” regulator output voltage selection. www.national.com 2 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. 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. DOSA Pin Number AAB Pin Number Function 1 1 VOUT 2 2 VOUT 3 3 SENSE 4 4 VOUT 5 5 GND 6 GND 7 GND <<KEY>> Mechanical Key 8 SCLK 9 SPWI 10 VPWI 11 AVIN 12 PGOOD A 13 I Share - Not Routed 6 14 GND 7 15 VIN 8 16 VIN B 17 SEQ - Not Routed 9 18 TRIM - Not Routed 10 19 ON/OFF 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 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: Function Description 1 GND System ground 2 VPWI VPWI voltage 3 SCLK Serial clock 4 SPWI Serial data 5 ENABLE Regulator enable 6 RST# Regulator reset (active low) 7 PWROK Regulator output of power okay indicator 8 VBAT Mainboard “VBAT” voltage 9 GND System ground 3 www.national.com AN-2070 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: 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. AN-2070 INDICATOR LEDS When JP7 is ON and the indicator LEDs are enabled, they have the following functionality: Ref Des Color Description D1 Red AVIN is powered up D2 Yellow VPWI is powered up D3 Green The PWROK signal is driven high 1. 2. 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 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. Designator Value Description Qty. Mfg. P/N AVIN Yellow Banana Jack Yellow Nylon Banana Jack 1 Emerson 108-0907-001 C1 1µF/35V/X7R VPWI CIN 1 T-Y GMK212B7105KG-T C2 2.2µF/10V/20%/Tant VPWI COUT 1 Nichicon F931A225MAA C3 7pF/50V/C0G VPWI Feedback Bypass 1 TDK C1608C0G1H070D D1 LS L29K-H1J2-1-Z Red LED for AVIN Indicator 1 OSRAM LS L29K-H1J2-1-Z D2 LY L29K-J1K2-26-Z Yellow LED for VPWI Indicator 1 OSRAM LY L29K-J1K2-26-Z D3 LG L29K-G2J1-24-Z Green LED for PGOOD Indicator 1 OSRAM LG L29K-G2J1-24-Z GND, GND2, GND3 Black Banana Jack Black Nylon Banana Jack 3 Emerson 108-0903-001 J1 DOSA Receptacle 1x20 100-mil Receptacle 1 Tyco 6-534237-8 J1-Key DOSA Receptacle Key Key to make pin 8 inaccessible 1 Tyco 86286-1 J2 Samtec HSEC8 MAK Connector Receptacle 1 Samtec HSEC8-125-01-S-DV-A JP1, JP2, JP3, JP4, JP5, JP6, JP9 1x3, 100-mil Header 1x3 100-mil Jumper 7 Molex 90120-0763 JP7, JP8 1x2, 100-mil Header 1x2 100-mil Jumper 2 Molex 90120-0762 JP10 2x3, 100-mil Header VPWI Voltage Select Jumper 1 Molex 90131-0763 P1, P2, P3 A28694-ND Baseboard Connectors 3 Tyco 1-87227-3 P4 1x9, 100-mil Header 1x9 PWI Access Header 1 Molex 90120-0769 PVIN Red Banana Jack Red Nylon Banana Jack 1 Emerson 108-0902-001 Q1, Q2, Q3 NDS331N Logic NFET 3 Fairchild NDS331N R1, R22, R34, R35 10R/0.25W/5% Fuse Rs 4 Rohm ESR10EZPJ100 R2, R3 1.5K/0.1W/1% Presence Detect Rs 2 Rohm MCR03EZPFX1501 R4, R9 10K/0.1W/1% ENABLE P-U/P-D 2 Stackpole RMCF 1/16 10K 1% R R5, R6, R7, R8, R10, R11, R12, R15, R16, R17, R18, R19, R20, R21, R23, R24, R25, R26 0R/0.25W Pad shorts 18 Vishay CRCW12060000Z0EA R13, R14, R27 No Load Open pads 3 N/A R28 53.6K/0.1W/1% 2.5V VPWI Divider R 1 Panasonic ERJ-3EKF5362V R29, R30, R31 1.6K/0.1W/1% LED Current Limit R 3 Yageo RC0603FR-071K6L R32 86.6K/0.1W/1% 3.3V VPWI Divider R 1 Panasonic ERJ-3EKF8662V R33 24.0K/0.1W/1% 1.8V VPWI Divider R 1 Panasonic ERJ-3EKF2402V R36 51.1K/0.1W/1% LS VPWI Divider R 1 Panasonic ERJ-3EKF5112V TP1, TP2 No Load Remote Sense pads 2 N/A U1 LP2980IM5-ADJ VPWI Adjust LDO 1 National Semi LP2980IM5-ADJ VOUT White Banana Jack White Nylon Banana Jack 1 Emerson 108-0901-001 Jumper Shunts -- Installed Per Golden Sample 1x2 Shunt Jumper 9 Sullins SPC02SYAN 5 www.national.com AN-2070 Bill of Materials 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 Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise® Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise® Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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