MAX5474_07 [MAXIM]
MAX5474 Evaluation Kit; MAX5474评估套件
| 型号： | MAX5474_07 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | MAX5474 Evaluation Kit |
| 文件： | 总11页 (文件大小：187K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1034; Rev 0; 11/07
MAX5474 Evaluation Kit
Evluates:/MAX475
General Description
Features
♦ 2.7V to 5.25V Single-Supply Operation
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, 50kΩ non-
volatile, linear-taper digital potentiometer. Windows®
2000/XP/Vista-compatible software is available to pro-
vide a convenient user interface for exercising the
MAX5474 features.
♦ 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
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.
♦ PCB Pads for User-Supplied Microcontroller
Interface Signals
♦ PCB Pads for Potentiometer Signals (L, W, H)
♦ Proven USB-Compatible PCB Layout
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 (100kΩ) after IC replacement (U1).
♦ Evaluates the MAX5474/MAX5475 in 8-Pin SOT23
Package
♦ Windows 2000/XP/Vista (32-Bit)-Compatible
Software
♦ Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX5474EVKIT+
EV Kit
+Denotes lead-free and RoHS-compliant.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
22pF 5ꢀ, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H220J
TDK C1608C0G1H220J
0.1µF 10ꢀ, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
TDK C1608X7R1C104K
C1, C3–C10,
16
C18, C19
C20
2
1
C17, C21–C26
3300pF 10ꢀ, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H332K
TDK C1608X7R1H332K
10µF 20ꢀ, 6.3V X5R ceramic
capacitors (0805)
Murata GRM21BR60J106M
TDK C2012X5R0J106M
C2, C13, C15
C11, C12
3
2
3
Green LED (0603)
Panasonic LNJ314G8TRA
10pF 5ꢀ, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H100J
TDK C1608C0G1H100J
D1
FB1
H1
1
0
0
0
Not installed, ferrite-bead
inductor—short (PC trace) (0603)
Not installed, dual-row 10-pin (2 x 5)
header
1µF 10ꢀ, 10V X5R ceramic
capacitors (0603)
Murata GRM188R61A105K
TDK C1608X5R1A105K
C14, C16, C27
Not installed, dual-row 10-pin (2 x 5)
header—short
J1
JU1
1
3
3-pin header
JU2, JU3, JU4
3-way, 4-pin headers
Windows is a registered trademark of Microsoft Corp.
________________________________________________________________ Maxim Integrated Products
1
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
Component List (continued)
DESIGNATION QTY
DESCRIPTION
2-pin headers
DESIGNATION QTY
DESCRIPTION
JU5, JU6
2
93C46 type 3-wire EEPROM (8-pin
SO), 16-bit architecture
Atmel AT93C46A-10SU-2.7
U3
U4
1
1
USB type-B right-angle male
receptacle
P1
1
R1
R2
1
1
1
1
1
2
0
2
1
0Ω 5ꢀ resistor (0603)
UART-to-USB converter (TQFP-32L,
7mm x 7mm)
FTDI FT232BL
220Ω 5ꢀ resistor (0603)
10kΩ 5ꢀ resistor (0603)
2.2kΩ 5ꢀ resistor (0603)
1.5kΩ 5ꢀ resistor (0603)
27Ω 5ꢀ resistors (0603)
Not installed, resistor (0402)
100kΩ 5ꢀ resistors (0603)
51kΩ 5ꢀ resistor (0603)
R3
R4
Maxim 3.3V regulator
MAX8511EXK33+T (5-pin SC70)
U5
U6
1
1
R5
R6, R7
R8
Maxim 2.5V regulator
MAX8511EXK25+T (5-pin SC70)
R9, R10
R11
Maxim low-voltage logic-level
translators
U7, U8
2
MAX3374EEKA+T (8-pin SOT23)
Single-pole/double-throw (SPDT)
slide switches
SW1, SW2
SW3
2
1
Maxim CMOS switch debouncer
MAX6816EUS+T (4-pin SOT143)
U9
Y1
Y2
1
1
1
Momentary pushbutton switch
16MHz crystal
Citizen HCM49-16.000MABJ-UT
Maxim 32-tap, 50kΩ nonvolatile,
linear-taper digital potentiometer
MAX5474EKA+T (8-pin SOT23)
U1
U2
1
1
6MHz crystal
Citizen HCM49-6.000MABJ-UT
Maxim microcontroller
Maxim MAXQ2000-RAX+ (68-pin
QFN-EP, 10mm x 10mm)
—
—
—
6
1
1
Shunts
USB high-speed A-to-B cable, 6ft
PCB: MAX5474 Evaluation Kit+
Evluates:/MAX475
Component Suppliers
MAX5474 EV Kit Software Files
FILE
DESCRIPTION
SUPPLIER
PHONE
WEBSITE
Installs the EV kit files on the
computer
Murata Mfg. Co.,
Ltd.
INSTALL.EXE
770-436-1300 www.murata.com
MAX5474.EXE
USB_Driver_Help.PDF
FTD2XX.INF
Application program
Panasonic Corp.
TDK Corp.
800-344-2112 www.panasonic.com
USB driver installation help file
USB driver file
847-803-6100 www.component.tdk.com
Note: Indicate that you are using the MAX5474 when contacting
these component suppliers.
UNINST.INI
Uninstalls the EV kit software
2
_______________________________________________________________________________________
MAX5474 Evaluation Kit
Evluates:/MAX475
nect it. Administrator privileges are required to
install the USB device driver on Windows
2000/XP/Vista.
Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
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 doc-
ument for additional information.
• 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.
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.
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 soft-
ware 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).
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 tempo-
rary folder and uncompress the ZIP file.
See the Detailed Description of Software section for
more information on the software features.
2) Install the EV kit software on the computer by run-
ning the INSTALL.EXE program inside the tempo-
rary 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 win-
dow 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
_______________________________________________________________________________________
3
MAX5474 Evaluation Kit
Jumper and Switch Functions
Detailed Description of Hardware
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 power-
supply positive terminal to the VIN pad. Table 1 lists the
various options for powering the MAX5474 EV kit.
The MAX5474 EV kit demonstrates the MAX5474, a 32-
tap, 50kΩ 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 gener-
ated from the USB interface circuit, or from a user-sup-
plied 2.7V to 5.25V external DC power supply. The USB
interface circuit features MAX3374 low-voltage logic-
level translators (U7 and U8) for 2.7V to 5.25V operation.
Table 1. JU1 Jumper Functions (V
)
DD
Nonvolatile Memory
Programming Nonvolatile (NV) Memory in Stand-
Alone Operation
SHUNT
POSITION
V
PIN
EV KIT POWERED
FROM
DD
CONNECTED TO
1-2*
3.3V
USB interface circuit
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 posi-
tion upon power-up.
Do not use (EV kit will not
be powered)
Open
No connect
VIN
2-3
External power supply
*Default position.
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 memo-
ry 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.
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-sup-
plied 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 con-
figuring logic-input signal controls.
Evluates:/MAX475
Table 2. JU2, JU3, JU4 Jumper Functions (CS, U/D, INC)
SHUNT
POSITION
INTERFACE CONTROL
SIGNALS CONNECTED TO
INTERFACE SIGNALS CONTROLLED BY
1-2
PCB pads
User-supplied external signals (EV kit software not updated)
USB interface circuit and EV kit software
1-3*
USB interface circuit
Stand-alone operation, switches SW1, SW2, SW3 (EV kit software not updated):
• SW1 controls the CS signal
• SW2 controls the U/D signal
1-4
Switches
• SW3 controls the INC signal
Open
No connect
Do not use this configuration
*Default position.
4
_______________________________________________________________________________________
MAX5474 Evaluation Kit
Evluates:/MAX475
The stand-alone-operation switches can be used to
store the MAX5474 wiper position into nonvolatile mem-
ory. To store the MAX5474 wiper position into non-
volatile 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 posi-
tion upon power-up.
Stand-Alone Operation Switches (SW1, SW2, SW3)
The MAX5474 EV kit features three switches to control
the MAX5474 interface signals for stand-alone opera-
tion. 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 sig-
nals 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.
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 ref-
erenced 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.
Table 5. Stand-Alone Operation for SW1,
SW2, SW3 Switch Functions (CS, U/D,
INC Signals)
LOGIC-
INPUT PINS
SWITCH
LOGIC-INPUT PINS FUNCTION
Table 3. JU5 Jumper Functions (L Signal
and GND)
High = U1 disabled
Low = U1 enabled
SW1
CS
SHUNT
POSITION
L PIN
CONNECTED TO
High = Increment up
Low = Decrement down
EV KIT FUNCTIONS
SW2
U/D
Potentiometer or
variable resistor
Not installed*
L PCB pad
GND
Increment if: CS = low, U/D = high,
and INC = ↓
Decrement if: CS = low, U/D = low,
SW3
INC
Voltage-divider with
ground reference
Installed
and INC = ↓
*Default position.
↓ = High-to-low transition.
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 recon-
figure the MAX5474 as a variable resistor, install a shunt
on jumper JU6. Table 4 lists the JU6 jumper options.
Note: For stand-alone operation:
1) To power the EV kit, connect an external power
supply to V and GND and install a shunt on pins
IN
2-3 of jumper JU1 (see Table 1).
2) To utilize the switches, install a shunt across pins 1-
4 of jumpers JU2, JU3, and JU4 (see Table 2).
Table 4. JU6 Jumper Functions
(H and W pins)
Evaluating the MAX5475
The MAX5475 is similar to the MAX5474, but has an
end-to-end resistance of 100kΩ. To evaluate the
MAX5475, order a free sample of the MAX5475 and
replace IC U1. The software is compatible with the
MAX5475 IC.
SHUNT
POSITION
H AND W PINS
EV KIT FUNCTIONS
Not installed*
Installed
Not connected
Connected
Potentiometer
Variable resistor
*Default position.
_______________________________________________________________________________________
5
MAX5474 Evaluation Kit
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 non-
volatile memory. Pressing the Reset button synchro-
nizes the software and wiper position by returning the
MAX5474 wiper to the midscale position.
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 win-
dow provides the USB interface circuit communication
status. The bottom right-side status bar indicates the
presence or absence of the MAX5474 IC and opera-
tional status.
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 soft-
ware 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 ini-
tialized to midscale position at startup. Software initial-
ization 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 soft-
ware 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 dis-
charge of bypass capacitors). Do not restart the soft-
ware. Use an ohmmeter to verify the resistance
between the L and W PCB pads.
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 soft-
ware 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 soft-
ware 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.
Evluates:/MAX475
Perform a Reset to synchronize the software and
MAX5474 IC wiper position. Pressing the Reset button
does not overwrite the MAX5474 nonvolatile memory.
Factory Default
Pressing the Factory Default button resets the wiper
position in the MAX5474 volatile and nonvolatile memo-
ry to the factory-default position. The factory-default
wiper position in the volatile and nonvolatile memory is
at midscale.
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.
Figure 2. MAX5474 Evaluation Kit Interface Circuit Popup Window
6
_______________________________________________________________________________________
MAX5474 Evaluation Kit
Evluates:/MAX475
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 inter-
face 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?
+3.3V
VDD
1
2
2
V
DD
JU1
3
C26
U1
VIN
GND
L
0.1μF
MAX5474
JU5
3
1
GND
GND
CS
8
L
CS
2
JU2
U7_8
VDD
1
3
7
6
R9
100kΩ
4
4
4
W
H
W
H
1 SW1
3
2
JU6
U/D
2
1
JU3
4
GND
U/D
U7_1
VDD
3
R10
100kΩ
1 SW2
3
2
INC
2
1
JU4
5
INC
U8_8
VDD
3
VDD
4
VCC
U9
C25
0.1μF
R11
51kΩ
MAX6818
1
GND
SW3
2
1, 2
3, 4
3
IN
OUT
Figure 3a. MAX5474 EV Kit Schematic (Sheet 1 of 2)
_______________________________________________________________________________________
7
MAX5474 Evaluation Kit
+5V
+5V
+5V
+3.3V
R1
0Ω
C5
0.1μF
C6
0.1μF
C7
0.1μF
C8
0.1μF
FB1
SHORT
+5V
(PC TRACE)
+3.3V
C10
0.1μF
68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52
30
3
VCC
26
VCC
13
C1
0.1μF
C2
10μF
C3
0.1μF
C4
0.1μF
+2.5V
AVCC
VCCIO
27
51
VDDIO
HFXIN
6
25
24
23
22
21
20
19
18
16
12
11
14
49
1
3V3OUT
TXD
TXD
RXD
RTS
CTS
DTR
DSR
DCD
RI
P1
VBUS
VDD
C20
3300pF
C9
0.1μF
1
2
3
4
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
SEG26/P3.2
SEG27/P3.3
GND
C11
10pF
RXD
RTS
Y1
6MHz
2
6
5
8
7
SHIELD
SHIELD
D-
D+
USBDM
USBDP
50
3
HFXOUT
R7
27Ω
4
C12
CTS
10pF
5
48
47
46
45
44
43
41
40
39
38
37
36
34
35
DTR
GND
P6.5/T0/WKOUT 1
P6.4/T0B/WKOUT 0
P6.3/T2/OW_IN
P6.2/T2B/OW_OUT
P6.1/T1/INT13
P6.0/T1B/INT12
P5.7/MISO
CTS
DSR
R6
27Ω
U4
FT232BL
R5
1.5kΩ
6
USB TYPE B
DSR
+5V
7
5
4
R8
OPEN
RSTOUT
RESET
XTIN
8
DCD
U2
9
27
RI
MAXQ2000
10
11
12
13
14
15
16
17
28
42
C19
22pF
TXDEN
TXLED
RXLED
PWRCTL
Y2
6MHz
28
XTOUT
P5.6/SCLK
+5V
U3
AT93C46A
C18
22pF
P5.5/MOSI
8
6
7
5
1
2
32
1
VCC
ORG
N.C.
GND
CS
SK
EECS
EESK
P5.4/SS
+3.3V
R2
220Ω
P5.3/TX1/INT11
P5.2/RX1/INT10
32KIN
15
10
3
4
C17
0.1μF
2
PWREN
SLEEP
D1
D0
EEDATA
TEST
D1
31
AGND GND
29
GND
17
+5V
32KOUT
R4
2.2kΩ
9
GND
18 19 20 21 22 23 24 25 26 29 30 31 32 33
R3
10kΩ
+3.3V
VDD
6
3
5
4
7
2
8
1
THREE-STATE
VCC
C21
0.1μF
C23
0.1μF
C27
1μF
H1
JTAG
+3.3V
J1
HEADER 2X5
U7
MAX3374E
VL
GND
TCK
H1-1
H1-4
H1-6
H1-8
H1-2
RESET
TDO
TMS
TDI
J1-1
J1-3
J1-5
J1-7
J1-2
J1-4
J1-6
J1-8
DTR
RI
TDO
TMS
H1-3
H1-5
H1-7
RESET
U2_59
I VL1
I VL2
O VCC1
O VCC2
U7_8
RTS
DCD
DSR
U2_60
U7_1
TDI
H1-9 H1-10
TCK
J1-9 J1-10
SHORT
+3.3V
VDD
Evluates:/MAX475
6
3
5
4
7
2
8
1
THREE-STATE
VCC
GND
C22
0.1μF
C24
0.1μF
+5V
+3.3V
+5V
+2.5V
5
U8
MAX3374E
VL
1
5
2
1
IN
OUT
GND
IN
OUT
GND
U5
MAX8511
U6
MAX8511
C15
10μF
C13
10μF
U2_61
I VL1
I VL2
O VCC1
O VCC2
U8_8
3
3
2
SHDN
SHDN
C16
1μF
C14
1μF
Figure 3b. MAX5474 EV Kit Schematic (Sheet 2 of 2)
8
_______________________________________________________________________________________
MAX5474 Evaluation Kit
Evluates:/MAX475
Figure 4. MAX5474 EV Kit Component Placement Guide—Component Side
_______________________________________________________________________________________
9
MAX5474 Evaluation Kit
Evluates:/MAX475
Figure 5. MAX5474 EV Kit PCB Layout—Component Side
10 ______________________________________________________________________________________
MAX5474 Evaluation Kit
Evluates:/MAX475
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
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
CARDENAS
相关型号：
MAX5475EKA+T
Digital Potentiometer, 1 Func, 100000ohm, Increment/decrement Control Interface, 32 Positions, BICMOS, PDSO8, MO-178, SOT-23, 8PIN
MAXIM
MAX5477ETE#G16
Digital Potentiometer, 1 Func, 10000ohm, 2-wire Serial Control Interface, 256 Positions, BICMOS, 3 X 3 MM, 0.80 MM HEIGHT, MO-220WEED-2, TQFN-16
MAXIM
MAX5477ETE+
Digital Potentiometer, 1 Func, 10000ohm, 2-wire Serial Control Interface, 256 Positions, BICMOS, TQFN-16
MAXIM
©2020 ICPDF网 联系我们和版权申明