NSC AN-2070

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. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY
OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO
SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS,
IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS
DOCUMENT.
TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT
NATIONAL’S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL
PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR
APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND
APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE
NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS.
EXCEPT AS PROVIDED IN NATIONAL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO
LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE
AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR
PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY
RIGHT.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR
SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
Life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and
whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected
to result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform
can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness.
National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other
brand or product names may be trademarks or registered trademarks of their respective holders.
AN-2070
Copyright© 2010 National Semiconductor Corporation
For the most current product information visit us at www.national.com
National Semiconductor
Americas Technical
Support Center
Email: [email protected]
Tel: 1-800-272-9959
www.national.com
National Semiconductor Europe
Technical Support Center
Email: [email protected]
National Semiconductor Asia
Pacific Technical Support Center
Email: [email protected]
National Semiconductor Japan
Technical Support Center
Email: [email protected]