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19-1034; Rev 0; 11/07
MAX5474 Evaluation Kit
General Description
The MAX5474 evaluation kit (EV kit) is an assembled and tested printed-circuit board (PCB) that evaluates the MAX5474 IC. The MAX5474 is a 32-tap, 50k nonvolatile, linear-taper digital potentiometer. Windows(R) 2000/XP/Vista-compatible software is available to provide a convenient user interface for exercising the MAX5474 features. The MAX5474 EV kit provides three options to control the MAX5474 wiper position using logic-input signals. The MAX5474 logic-input signals can be controlled by an on-board USB interface circuit, PCB interfacing pads, or switches on the EV kit circuit for stand-alone operation. The EV kit can operate from a 3.3V source generated from the USB interface circuit or from a 2.7V to 5.25V external DC power supply. The EV kit can also evaluate the MAX5475 (100k) after IC replacement (U1).
Features
2.7V to 5.25V Single-Supply Operation Power-On Recall of Wiper Position from Nonvolatile Memory On-Board USB Interface Circuit USB Powered USB-PC Connection (Cable Included) Stand-Alone Operation Using On-Board Switches PCB Pads for User-Supplied Microcontroller Interface Signals PCB Pads for Potentiometer Signals (L, W, H) Proven USB-Compatible PCB Layout Evaluates the MAX5474/MAX5475 in 8-Pin SOT23 Package Windows 2000/XP/Vista (32-Bit)-Compatible Software Fully Assembled and Tested
Evaluates: MAX5474/MAX5475
Ordering Information
PART MAX5474EVKIT+ +Denotes lead-free and RoHS-compliant. TYPE EV Kit
Component List
DESIGNATION C1, C3-C10, C17, C21-C26 QTY DESCRIPTION 0.1F 10%, 16V X7R ceramic capacitors (0603) Murata GRM188R71C104K TDK C1608X7R1C104K 10F 20%, 6.3V X5R ceramic capacitors (0805) Murata GRM21BR60J106M TDK C2012X5R0J106M 10pF 5%, 50V C0G ceramic capacitors (0603) Murata GRM1885C1H100J TDK C1608C0G1H100J 1F 10%, 10V X5R ceramic capacitors (0603) Murata GRM188R61A105K TDK C1608X5R1A105K DESIGNATION QTY DESCRIPTION 22pF 5%, 50V C0G ceramic capacitors (0603) Murata GRM1885C1H220J TDK C1608C0G1H220J 3300pF 10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H332K TDK C1608X7R1H332K Green LED (0603) Panasonic LNJ314G8TRA Not installed, ferrite-bead inductor--short (PC trace) (0603) Not installed, dual-row 10-pin (2 x 5) header Not installed, dual-row 10-pin (2 x 5) header--short 3-pin header 3-way, 4-pin headers
16
C18, C19
2
C2, C13, C15
3
C20
1
D1 FB1 H1 J1 JU1
1 0 0 0 1 3
C11, C12
2
C14, C16, C27
3
Windows is a registered trademark of Microsoft Corp.
JU2, JU3, JU4
________________________________________________________________ Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX5474 Evaluation Kit Evaluates: MAX5474/MAX5475
Component List (continued)
DESIGNATION JU5, JU6 P1 R1 R2 R3 R4 R5 R6, R7 R8 R9, R10 R11 SW1, SW2 SW3 U1 QTY 2 1 1 1 1 1 1 2 0 2 1 2 1 1 DESCRIPTION 2-pin headers USB type-B right-angle male receptacle 0 5% resistor (0603) 220 5% resistor (0603) 10k 5% resistor (0603) 2.2k 5% resistor (0603) 1.5k 5% resistor (0603) 27 5% resistors (0603) Not installed, resistor (0402) 100k 5% resistors (0603) 51k 5% resistor (0603) Single-pole/double-throw (SPDT) slide switches Momentary pushbutton switch Maxim 32-tap, 50k nonvolatile, linear-taper digital potentiometer MAX5474EKA+T (8-pin SOT23) Maxim microcontroller Maxim MAXQ2000-RAX+ (68-pin QFN-EP, 10mm x 10mm) U9 Y1 Y2 U2 1 -- -- -- 1 1 1 6 1 1 U7, U8 2 U5 U6 1 1 U4 1 U3 1 DESIGNATION QTY DESCRIPTION 93C46 type 3-wire EEPROM (8-pin SO), 16-bit architecture Atmel AT93C46A-10SU-2.7 UART-to-USB converter (TQFP-32L, 7mm x 7mm) FTDI FT232BL Maxim 3.3V regulator MAX8511EXK33+T (5-pin SC70) Maxim 2.5V regulator MAX8511EXK25+T (5-pin SC70) Maxim low-voltage logic-level translators MAX3374EEKA+T (8-pin SOT23) Maxim CMOS switch debouncer MAX6816EUS+T (4-pin SOT143) 16MHz crystal Citizen HCM49-16.000MABJ-UT 6MHz crystal Citizen HCM49-6.000MABJ-UT Shunts USB high-speed A-to-B cable, 6ft PCB: MAX5474 Evaluation Kit+
Component Suppliers
SUPPLIER Murata Mfg. Co., Ltd. Panasonic Corp. TDK Corp. PHONE 770-436-1300 800-344-2112 847-803-6100 WEBSITE www.murata.com www.panasonic.com www.component.tdk.com
MAX5474 EV Kit Software Files
FILE INSTALL.EXE MAX5474.EXE USB_Driver_Help.PDF FTD2XX.INF UNINST.INI DESCRIPTION Installs the EV kit files on the computer Application program USB driver installation help file USB driver file Uninstalls the EV kit software
Note: Indicate that you are using the MAX5474 when contacting these component suppliers.
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MAX5474 Evaluation Kit
Quick Start
Recommended Equipment
Before beginning, the following equipment is needed: * Maxim MAX5474 EV kit (USB cable included) * User-supplied Windows 2000/XP/Vista-compatible PC with a spare USB port * One ohmmeter Note: In the following sections, software-related items are identified by bolding. Text in bold refers to items directly from the EV kit software. Text in bold and underlined refers to items from the Windows operating system. nect it. Administrator privileges are required to install the USB device driver on Windows 2000/XP/Vista. 8) Follow the directions of the Add New Hardware Wizard to install the USB device driver. Choose the Search for the best driver for your device option. Specify the location of the device driver to be C:\Program Files\MAX5474 (default installation directory) using the Browse button. During device driver installation, Windows may show a warning message indicating that the device driver Maxim uses does not contain a digital signature. This is not an error condition and it is safe to proceed with installation. Refer to the USB_Driver_Help.PDF document for additional information. 9) Start the MAX5474 EV kit software by opening its icon in the Start | Programs menu. 10) The software automatically searches for the MAX5474. After successful connection, the EV kit software main window appears in the upper-left corner of the window. Select the Up/Down buttons to change the wiper position, or enter the desired wiper position into the Wiper Input combo box (see Figure 1). See the Detailed Description of Software section for more information on the software features.
Evaluates: MAX5474/MAX5475
Procedure
The EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. 1) Visit www.maxim-ic.com/evkitsoftware to download the latest version of the EV kit software, 5474Rxx.ZIP. Save the EV kit software to a temporary folder and uncompress the ZIP file. 2) Install the EV kit software on the computer by running the INSTALL.EXE program inside the temporary folder. The program files are copied and icons are created in the Windows Start | Programs menu. 3) Verify that a shunt is installed on pins 1-2 of jumper JU1. This configures the MAX5474 IC's VDD to 3.3V from the USB interface circuit. 4) Verify that a shunt is installed on pins 1-3 of jumpers JU2, JU3, and JU4. This configures the logic-input pins to receive signals from the USB interface circuit. 5) Verify that no shunt is installed on jumpers JU5 and JU6, the L PCB pad is not connected to GND, and the H PCB pad is not connected to the W PCB pad. 6) Connect the ohmmeter across the W and L PCB pads. 7) Connect the USB cable from the PC to the MAX5474 EV kit. A Building Driver Database window pops up in addition to a New Hardware Found message when installing the USB driver for the first time. If a window similar to the one described above does not appear after 30s, remove the USB cable from the board and recon-
Figure 1. MAX5474 Evaluation Kit Software Main Window
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MAX5474 Evaluation Kit Evaluates: MAX5474/MAX5475
Detailed Description of Hardware
The MAX5474 EV kit demonstrates the MAX5474, a 32tap, 50k nonvolatile, linear-taper digital potentiometer IC's features. The EV kit uses a MAX5474 IC in an 8-pin SOT23 package on a proven two-layer PCB design. The MAX5474 EV kit provides two options to power the MAX5474 IC. It can operate from the 3.3V supply generated from the USB interface circuit, or from a user-supplied 2.7V to 5.25V external DC power supply. The USB interface circuit features MAX3374 low-voltage logiclevel translators (U7 and U8) for 2.7V to 5.25V operation.
Jumper and Switch Functions
Using an External DC Power Supply The MAX5474 EV kit can be powered by an external 2.7V to 5.25V DC power supply. To connect the EV kit to an external power supply, disconnect the USB cable and install a shunt on pins 2-3 of jumper JU1. Turn off the power supply and connect the power-supply ground terminal to the EV kit GND pad and the powersupply positive terminal to the VIN pad. Table 1 lists the various options for powering the MAX5474 EV kit.
Nonvolatile Memory
Programming Nonvolatile (NV) Memory in StandAlone Operation In stand-alone operation, the MAX5474 wiper position is stored in nonvolatile memory whenever the SPDT slide switch SW1 (CS) is moved from EN to DIS (rising edge) and the pushbutton switch SW3 (INC) is not depressed (high). The wiper returns to this stored position upon power-up. Software Operation In software operation, the MAX5474 wiper position is stored in nonvolatile memory when the Store button is pressed. The MAX5474 wiper returns to this position upon power-up. After powering up the EV kit, before changing the wiper position from the nonvolatile memory position, press the Reset button to reinitialize the wiper to a known position (midscale). Reset does not overwrite the MAX5474 nonvolatile memory; press the Factory Default button to reset the NV memory to the factory-preset position (midscale). See the Detailed Description of Software section for more information.
Table 1. JU1 Jumper Functions (VDD)
SHUNT POSITION 1-2* Open 2-3 VDD PIN CONNECTED TO 3.3V No connect VIN EV KIT POWERED FROM USB interface circuit Do not use (EV kit will not be powered) External power supply
*Default position.
Interface Control Signals The MAX5474 EV kit circuit features three logic-input signals to control the MAX5474 wiper position. The chip-select (CS), up/down (U/D), and increment (INC) interface signals are controlled by the on-board USB interface circuit or the PCB pads, along with user-supplied external control signals, or stand-alone operation using switches on the EV kit. Jumpers JU2, JU3, and JU4 select the interface-signal-control sources for the MAX5474 IC. Table 2 lists the various options for configuring logic-input signal controls.
Table 2. JU2, JU3, JU4 Jumper Functions (CS, U/D, INC)
SHUNT POSITION 1-2 1-3* INTERFACE CONTROL SIGNALS CONNECTED TO PCB pads USB interface circuit INTERFACE SIGNALS CONTROLLED BY User-supplied external signals (EV kit software not updated) USB interface circuit and EV kit software Stand-alone operation, switches SW1, SW2, SW3 (EV kit software not updated): * SW1 controls the CS signal * SW2 controls the U/D signal * SW3 controls the INC signal Do not use this configuration
1-4
Switches
Open
No connect
*Default position.
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MAX5474 Evaluation Kit
The stand-alone-operation switches can be used to store the MAX5474 wiper position into nonvolatile memory. To store the MAX5474 wiper position into nonvolatile memory, set the wiper to the desired position and slide the SPDT switch SW1 (CS) from EN to DIS (rising edge), while pushbutton switch SW3 (INC) is not depressed (high). The wiper returns to this stored position upon power-up.
Voltage-Divider with Ground Reference The MAX5474 EV kit provides an option to configure the MAX5474 as a voltage-divider referenced to ground (GND). To configure the EV kit as a voltage-divider referenced to ground, connect the L PCB pad to GND using jumper JU5, connect the voltage source to the H PCB pad, and the application input signal to the W PCB pad. Jumper JU5 connects or disconnects the L signal from GND. Table 3 lists the JU5 jumper options.
Stand-Alone Operation Switches (SW1, SW2, SW3) The MAX5474 EV kit features three switches to control the MAX5474 interface signals for stand-alone operation. SPDT slide switches SW1 and SW2 control the CS and U/D signals, respectively, and pushbutton switch SW3 controls the INC signal. The CS, U/D, and INC signals interact to control the wiper position of the MAX5474. Table 5 lists the functions of switches SW1, SW2, and SW3 for stand-alone operation. Refer to the Truth Table in the MAX5474 IC data sheet for specific switch sequence.
Evaluates: MAX5474/MAX5475
Table 5. Stand-Alone Operation for SW1, SW2, SW3 Switch Functions (CS, U/D, INC Signals)
SWITCH SW1 SW2 LOGICINPUT PINS CS U/D LOGIC-INPUT PINS FUNCTION High = U1 disabled Low = U1 enabled High = Increment up Low = Decrement down Increment if: CS = low, U/D = high, and INC = Decrement if: CS = low, U/D = low, and INC =
Table 3. JU5 Jumper Functions (L Signal and GND)
SHUNT POSITION Not installed* Installed L PIN CONNECTED TO L PCB pad GND EV KIT FUNCTIONS Potentiometer or variable resistor Voltage-divider with ground reference
SW3
INC
*Default position.
= High-to-low transition. Note: For stand-alone operation: 1) To power the EV kit, connect an external power supply to VIN and GND and install a shunt on pins 2-3 of jumper JU1 (see Table 1). 2) To utilize the switches, install a shunt across pins 14 of jumpers JU2, JU3, and JU4 (see Table 2).
Variable Resistor or Potentiometer The MAX5474 EV kit configures the MAX5474 as a potentiometer by default. The EV kit provides an option to reconfigure the MAX5474 as a variable resistor by connecting the MAX5474 IC's H and W pins. To reconfigure the MAX5474 as a variable resistor, install a shunt on jumper JU6. Table 4 lists the JU6 jumper options.
Table 4. JU6 Jumper Functions (H and W pins)
SHUNT POSITION Not installed* Installed *Default position. H AND W PINS Not connected Connected EV KIT FUNCTIONS Potentiometer Variable resistor
Evaluating the MAX5475
The MAX5475 is similar to the MAX5474, but has an end-to-end resistance of 100k. To evaluate the MAX5475, order a free sample of the MAX5475 and replace IC U1. The software is compatible with the MAX5475 IC.
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MAX5474 Evaluation Kit Evaluates: MAX5474/MAX5475
Detailed Description of Software
The MAX5474 EV kit software graphical user interface (GUI) is a Windows program that provides a convenient means to control the MAX5474, as shown in Figure 1. Text in bold denotes user-selectable features in the MAX5474 EV kit software. A mouse or the keyboard's TAB key is used to navigate various items on the main window. The bottom left-side status bar of the main window provides the USB interface circuit communication status. The bottom right-side status bar indicates the presence or absence of the MAX5474 IC and operational status.
Wiper Position
Moving the Wiper Position track bar will update and display the MAX5474 wiper position. Pressing the Store button stores the MAX5474 wiper to the nonvolatile memory. Pressing the Reset button synchronizes the software and wiper position by returning the MAX5474 wiper to the midscale position. The Wiper Input combo box accepts and displays a number between 1 and 32 for the wiper input. The Wiper Input also features a drop-down menu that stores the last four user entries. After pressing the Store button, the Wiper Stored edit box displays the MAX5474 IC's stored wiper position, and is read only.
Software Startup
Upon starting the program, the MAX5474 EV kit software automatically detects for the USB and interface circuit connection. The MAX5474 EV kit enters normal operating mode when the USB connection is detected. The software Wiper Position and Wiper Input are initialized to midscale position at startup. Software initialization sets the volatile register of the MAX5474 IC to midscale. The NV memory remains unchanged. If the USB connection is not detected, the software prompts the user to retry, exit the program, or enter the demo mode.
Up and Down
Pressing the Up button increments the wiper one tap position, while pressing the Down button decrements the wiper one tap position. These buttons also move the Wiper Position track bar to the respective position.
Nonvolatile Memory
The MAX5474 wiper position is stored in nonvolatile memory when the Store button is pressed. The MAX5474 wiper returns to this position upon power-up. To demonstrate the nonvolatile memory feature in software operation, press the Store button to store the wiper position to the nonvolatile memory. Power cycle the EV kit by removing the shunt from jumper JU1 and reinstalling the shunt after 5s or longer (to allow discharge of bypass capacitors). Do not restart the software. Use an ohmmeter to verify the resistance between the L and W PCB pads. Perform a Reset to synchronize the software and MAX5474 IC wiper position. Pressing the Reset button does not overwrite the MAX5474 nonvolatile memory.
Demo Mode
The MAX5474 EV kit software can enter the demo mode, when the USB connection is not detected, by pressing the Cancel button in the MAX5474 Evaluation Kit Interface Circuit Popup Window (Figure 2). The software can also enter the demo mode at any time using the Options | Demo Mode pulldown menu item in the software main window. When in demo mode, all software communication to the EV kit circuit is disabled; however, most of the software GUI is functional. Demo mode allows the user to evaluate the software without hardware connectivity. To exit demo mode, select Options | Demo Mode again from the pulldown menu. Note: When reentering normal operating mode from the demo mode, the MAX5474 wiper position must be reset. Reset the wiper by pressing the Reset button. See the Nonvolatile Memory section for more details.
Factory Default
Pressing the Factory Default button resets the wiper position in the MAX5474 volatile and nonvolatile memory to the factory-default position. The factory-default wiper position in the volatile and nonvolatile memory is at midscale.
Figure 2. MAX5474 Evaluation Kit Interface Circuit Popup Window
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MAX5474 Evaluation Kit
Keyboard Navigation
Press the TAB key to select each GUI control. The selected control is indicated by a dotted outline. Using SHIFT+TAB moves the selection to the previously selected control. Buttons respond to the keyboard's SPACE bar. Some controls respond to the keyboard UP and DOWN arrow keys. Activate the program's menu bar by pressing the F10 key, and then press the letter of the desired menu item. Most menu items have one letter underlined, indicating their shortcut key.
General Troubleshooting
Problem: Software reports it cannot find the interface circuit. * Is the interface circuit power LED lit? * Is the USB cable connected? * Has Windows plug-and-play detected the board? Bring up Control Panel-->System-->Device Manager and look at what device nodes are indicated for USB. If there is an "unknown device" node attached to the USB, delete it (this forces plug-and-play to try again). * Are jumpers JU1-JU4 properly configured for USB operation?
Evaluates: MAX5474/MAX5475
+3.3V VDD 1 2 3 VIN GND CS JU2 U7_8 VDD 1 SW1 2 3 U/D JU3 GND U7_1 VDD 1 SW2 2 3 INC JU4 VDD U9 R11 51k SW3 1, 2 3, 4 2 IN MAX6818 GND OUT VCC 4 C25 0.1F VDD U8_8 3 4 2 5 1 INC 3 R10 4 100k 2 4 1 U/D H 6 JU6 H 3 R9 4 100k 2 1 1 CS W 7 W JU1 C26 0.1F 3 GND L 2 VDD U1 MAX5474 8 JU5 L GND
1 3
Figure 3a. MAX5474 EV Kit Schematic (Sheet 1 of 2)
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MAX5474 Evaluation Kit Evaluates: MAX5474/MAX5475
+5V U2_61 U2_60 U2_59 RXD TXD +3.3V
FB1 SHORT (PC TRACE) C1 0.1F P1 VBUS 6 5 SHIELD DSHIELD D+ GND USB TYPE B 1 2 3 4 R6 27 +5V R7 27 C2 10F C3 0.1F
+5V
R1 0
+5V C5 0.1F C6 0.1F
+5V C7 0.1F
+3.3V C8 0.1F
+3.3V VLCD2 SEG9/P1.1 SEG8/P1.0 SEG3/P0.3 SEG2/P0.2 SEG1/P0.1 SEG10/P1.2 SEG0/P0.0 VLCD1 VLCD VADJ SEG7/P0.7/INT3 SEG6/P0.6/INT2 SEG5/P0.5/INT1 SEG4/P0.4/INT0 P7.1/RX0/INT15 P7.0/TX0/INT14 C4 0.1F 6 C20 3300pF 8 30 AVCC 3V3OUT 3 VCC 26 VCC 13 VCCIO TXD RXD USBDM RTS CTS USBDP U4 FT232BL 5 4 27 C19 22pF Y2 6MHz 28 XTOUT RSTOUT DCD RESET XTIN RI TXDEN TXLED RXLED 32 1 2 31 EECS EESK EEDATA TEST AGND 29 GND 9 GND 17 PWREN SLEEP 15 10 PWRCTL DTR DSR 25 24 23 22 21 20 19 18 16 12 11 14 R2 220 D1 +3.3V TXD RXD RTS CTS DTR DSR DCD RI C9 0.1F 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 +2.5V 49 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 28 42 VDD VDDIO HFXIN 27 51
C10 0.1F
SEG11/P1.3 SEG12/P1.4 SEG13/P1.5 SEG14/P1.6 SEG15/P1.7 SEG16/P2.0 SEG17/P2.1 SEG18/P2.2 SEG19/P2.3 SEG20/P2.4 SEG21/P2.5 SEG22/P2.6 SEG23/P2.7 SEG24/P3.0 SEG25/P3.1 SEG28/P3.4/INT4 SEG29/P3.5/INT5
C11 Y1 6MHz 10pF HFXOUT 50 C12 10pF
7 R5 1.5k
P6.5/T0/WKOUT 1 P6.4/T0B/WKOUT 0 P6.3/T2/OW_IN U2 P6.2/T2B/OW_OUT P6.1/T1/INT13 P6.0/T1B/INT12 P5.7/MISO P5.6/SCLK P5.5/MOSI P5.4/SS P5.3/TX1/INT11 SEG30/P3.6/INT6 SEG31/P3.7/INT7 P4.0/TCK/INT8 P5.2/RX1/INT10 P4.1/TDI/INT9 P4.2/TMS P4.3/TDO 32KIN RESET 32KOUT SEG33/COM3 SEG34/COM2 SEG35/COM1
48 47 46 45 44 43 41 40 39 38 37 36 34 35 R8 OPEN
CTS DSR
MAXQ2000
+5V 8 6 C17 0.1F 7 5
U3 AT93C46A VCC ORG N.C. GND CS SK D1 D0
1 2 3 4 R4 2.2k R3 10k +5V
C18 22pF
SEG26/P3.2 SEG27/P3.3 GND GND
SEG32
18 19 20 21 22 23 24 25 26 29 30 31 32 33 VDD TDI TMS TDO TCK RESET VCC GND 7 2 8 1 C23 0.1F C27 1F TCK H1 JTAG H1-1 H1-3 H1-5 H1-7 TDI H1-9 H1-4 H1-6 H1-8 H1-2 H1-10 TDI TCK J1-7 J1-9 J1-8 J1-10 DCD DSR RESET +3.3V RESET TDO TMS J1 HEADER 2X5 J1-1 J1-3 J1-5 J1-2 J1-4 J1-6 DTR RI RTS
+3.3V 6 C21 0.1F 3 5 4 THREE-STATE VL I VL1 I VL2 U7
MAX3374E
O VCC1 O VCC2
U2_59 U2_60
U7_8 U7_1
TDO TMS
+3.3V 6 C22 0.1F 3 5 4 THREE-STATE VL I VL1 I VL2 U8 VCC GND O VCC1 O VCC2 7 2 8 1
VDD SHORT C24 0.1F +5V 1 U8_8 C16 1F 3 IN U5 OUT 5 C15 10F C14 1F +3.3V +5V 1 3 IN U6 OUT 5 C13 10F +2.5V
MAX3374E
U2_61
2 SHDN MAX8511 GND
2 SHDN MAX8511 GND
Figure 3b. MAX5474 EV Kit Schematic (Sheet 2 of 2)
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COM0
MAX5474 Evaluation Kit Evaluates: MAX5474/MAX5475
Figure 4. MAX5474 EV Kit Component Placement Guide--Component Side
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MAX5474 Evaluation Kit Evaluates: MAX5474/MAX5475
Figure 5. MAX5474 EV Kit PCB Layout--Component Side
10 ______________________________________________________________________________________
MAX5474 Evaluation Kit Evaluates: MAX5474/MAX5475
Figure 6. MAX5474 EV Kit PCB Layout--Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
(c) 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
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