MAX34451 Evaluation Kit
Evaluates: MAX34451
General Description
The MAX34451 evaluation kit (EV kit) provides the hard-
ware and software graphical-user interface (GUI) neces-
sary to evaluate the MAX34451 PMBus™ 16-channel
V/I monitor and 12-channel sequencer/marginer. The EV
kit includes a MAX34451 installed as well as four power
supplies that can be sequenced, monitored, and
margined by the device.
Features
● Easy Evaluation of the MAX34451
● Four Power-Supply Channels
● One Current-Sense Amplifier
● EV Kit Hardware is USB Powered (USB Cable
Included)
● USB HID interface
● Windows XP
®
- and Windows
®
7-Compatible
Software
● RoHS Compliant
● Proven PCB Layout
● Fully Assembled and Tested
EV Kit Contents
● Mini USB Cable
● Assembled Circuit Board Including MAX34451
Ordering Information
appears at end of data sheet.
MAX34451 EV Kit Photo
Windows and Windows XP are registered trademarks and
registered service marks of Microsoft Corporation.
PMBus is a trademark of SMIF, Inc.
19-6695; Rev 0; 5/13
MAX34451 Evaluation Kit
Evaluates: MAX34451
Component List
DESIGNATION
B1
C01, C05,
C211
C02, C03,
C07–C10, C212
C06, C11,
C20–C35, C215
C0A–C0D,
C2A–C2D, C160,
C162, C165, C201,
C202, C204
C163
C1A–C1D, C04,
C60–C67, C161,
C164, C203, C214
C213
D1, D5, D22
D2–D4, D7
D20, D21
DA–DD
J1, J15
J2, J22
J3–J6
J7, J8
J9–J14, J21
J20
J23
R0–R17, R36, R37,
R102, R107, R108,
R119, R201, R202,
R214
R0A–R0D,
R80–R91, R101,
R103, R109, R110,
R112, R114, R123,
R133, R135, R204
R1A–R1D
R2A–R2D
QTY
1
3
7
0
DESCRIPTION
Black banana jack (GND)
1µF, X7R ceramic capacitors
(0805)
0.1µF, X7R ceramic
capacitors (0805)
Do not populate, ceramic
capacitors (0805)
10µF, X5R ceramic capacitors
(0805)
Do not populate, 470µF
aluminum capacitor
0.01µF, X7R ceramic
capacitors (0805)
220nF, X7R ceramic capacitor
(0805)
Schottky diodes
Red LEDs (1206)
Red/green dual LEDs
Green LEDs (1206)
2-pin headers, 2.54mm pitch
4-pin headers, 2.54mm pitch
3-pin headers, 2.54mm pitch
10-pin (2 x 5) headers,
2.54mm pitch
Do not populate, headers
5-pin female Mini-USB
8-pin (2 x 4) header,
2.54mm pitch
DESIGNATION
R3A–R3D
R4A–R4D
R5A–R5D
R20–R35, R40–R51,
R116–R118, R132,
R134, R162, R215,
R216
R60–R67, R100,
R130, R131, R210
R68–R75 R111,
R161, R164, R207
R104, R113, R115,
R124, R211, R212
R105, R106, R213
R160, R163, R206
R165
R203, R205
S1, S2
S3
S4
S5–S7
TP15, TP17–TP25,
TP27–TP42
TP2–TP6,
TP9–TP11
TP1
TP7, TP44
TP8, TP43
QTY
4
4
4
0
DESCRIPTION
49.9Ω ±1% resistors (0805)
267Ω ±1% resistors (0805)
1kΩ ±1% resistors (0805)
Do not populate,
resistors (0805)
12
12
6
3
3
1
2
2
1
1
3
26
8
1
2
2
4.7kΩ ±1% resistors (0805)
10kΩ ±1% resistors (0805)
330Ω ±1% resistors (0805)
2.2kΩ ±1% resistors (0805)
45.3kΩ ±1% resistors (0805)
0.1Ω ±1% resistor (0805)
560Ω ±1% resistors (0805)
SPDT slide switches
Single-pole pushbutton switch
8-pole DIP switch
4-pole DIP switches
White test points
Black test points
Red test point
Orange test points
Yellow test points
PMBus 16-channel V/I
monitor and 12-channel
sequencer/ marginer
(56 TQFN-EP*)
Maxim MAX34451ETN+
500mA LDO regulators
(8 TDFN-EP*)
Maxim MAX8902BATA+
Digital temperature sensor
(8 SO,150mil)
Maxim DS75LVS+
25V/V precision current-sense
amplifier (SOT23)
Maxim MAX9938TEUK+
14
0
17
1
3
4
2
4
2
2
4
2
0
1
1
U1
1
27
0Ω ±1% resistors (0805)
U1A–U1D, U4,
U5, U22
7
26
100kΩ ±1% resistors (0805)
U2
1
4
4
8.66kΩ ±1% resistors (0805)
3.09kΩ ±1% resistors (0805)
U3
1
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MAX34451 Evaluation Kit
Evaluates: MAX34451
Component List (continued)
DESIGNATION
U20
U21
*EP
= Exposed pad.
QTY
1
1
DESCRIPTION
Microcontroller (28 SO)
Microchip PIC18LF2550-I/SO
50mA to 600mA current-limit
switch (6 SOT23)
Maxim MAX4995AAUT+
DESIGNATION
X1
—
—
—
QTY
1
9
1
1
DESCRIPTION
48MHz, 3.3V oscillator (SMD)
AVX KC3225A48.0000C30E00
Jumpers/shunts
Mini-USB cable
PCB: MAX34451 EV Kit
MAX34451 EV Kit Files
FILE
MAX34451EVKitSoftwareInstall.EXE
DESCRIPTION
Application program
Note:
The .EXE file is downloaded as a .ZIP file.
Quick Start
Required Equipment
● MAX34451 EV kit hardware
● Windows XP or Windows 7 PC
● USB port
● Mini-USB cable (included)
Note:
In the following sections, software-related items are
identified by
bolding.
Text in bold refers to items directly
from the install or EV kit software. Text in
bold and under-
lined refers to items from the Windows operating system.
Windows message appears near the
System Icon
menu, indicating that the hardware is ready to use. Do
not attempt to run the GUI prior to this message. If you
do, you must close the application and restart it once
the driver installation is complete. On some versions
of Windows, administrator privileges may be required
to install the USB device.
6) Once the device driver installation is complete,
visit
www.maximintegrated.com/evkitsoftware
to
download the latest version of the EV kit software,
MAX34451EVKitSoftwareInstall.ZIP. Save the EV kit
software to a temporary folder.
7) Open the .ZIP file and double-click the .EXE file to run
the installer. A message box stating:
The publisher
could not be verified. Are you sure you want to
run this software?
may appear. If so, click
Yes.
8) The installer GUI appears. Click
Next
and then
Install. Once complete, click Close.
9) Go to
Start | All Programs.
Look for the
MAX34451EVKitSoftware
folder and click on the
MAX34451EVKitSoftware.EXE inside the folder.
10) When the GUI appears, the text to the left of
the Maxim logo should display
EV Kit Hardware
Connected. The com LED (D21) on the EV kit board
should turn green.
Procedure
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation:
1) Ensure that jumpers/shunts on J23 and J1 are installed.
Note: The GND planes of the USB I
2
C dongle and the
EV kit are not connected. The GND jumper on J23
must be connected for proper communication.
2) Ensure that the 4-pole DIP switches RS (S5), PSEN
(S6), and PWM (S7) are in the on position.
3)
Set the EV kit hardware on a nonconductive surface to
ensure that nothing on the PCB gets shorted together.
4) Prior to starting the GUI, connect the EV kit hardware
to a PC using the supplied Mini-USB cable, or equiva-
lent. The power LED (D20) should be green and the
com LED (D21) should be red and slowly flash orange.
5) Windows should automatically begin installing the
necessary device driver. The USB interface of the
EV kit hardware is configured as an HID device and
therefore does not require a unique/custom device
driver. Once the driver installation is complete, a
Detailed Description of Software
Software Startup
If the MAX34451 EV kit is connected when the software
is opened, the software first initializes the hardware to
communicate. The software then searches for all slave
addresses on the I
2
C bus and connects to the first valid
slave address. The GUI displays
EV Kit Hardware
Connected
to the left of the Maxim logo. If the EV kit
is not connected on software startup, then the GUI
populates with default EV kit values. Once the EV kit is
connected, the GUI executes the sequence above.
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MAX34451 Evaluation Kit
Evaluates: MAX34451
The
File
menu item contains
Save, Load,
and
Exit
options. To save the current GUI configuration, click
Save
Project As.
This saves the device name, pin names, and
the RAM CRC to an XML file and saves PMBus configura-
tions to a HEX file. If a device is connected, this reads and
saves data directly from the device; otherwise, it saves
the configuration that is currently displayed on the GUI.
The STORE_DEAULT_ALL (11h) command is appended
to the end of the HEX file so that the configuration is
saved to the main flash when the HEX file is loaded. Load
Project updates the GUI with the XML file, writes the HEX
file to the device, performs a STORE_DEFAULT_ALL
(11h), and then reads current values from the device. The
RAM CRC and main flash CRC are then read and com-
pared to the CRC saved in the XML file. If a device is not
connected, the HEX file is written to a virtual device. The
HEX file only contains data for the PMBus commands that
are stored in flash.
Create Report saves a CSV file that
contains all the configuration tables.
The
Connection
menu item allows the user to connect
to a desired device.
Find Slave Addresses
searches
for all slave addresses connected to the I
2
C bus. To
select a device, click
Device1 Slave Address
and all
the slave addresses found are shown and are select-
able. Slave addresses 18h and 34h are not selectable to
prevent communicating with the alert response address
and factory-programmed address. If multiple devices are
connected, then the number of devices to read/write is
selected with the
Number of Devices
option.
The
Auto Polling
menu item allows the user to set the
automatic polling rate. Select the delay between reads by
choosing
300ms, 600ms, 800ms, 1000ms, 1500ms,
or
2000ms.
Press the
Auto Polling On
button in the status
bar to start the polling. Each poll reads the
Power Status
(STATUS_WORD 79h),
Fault Status
(STATUS_WORD
79h), and the polled values for the
Data Log Graph
tab.
The
Status
and
Margining
tabs are only polled if the
tab is currently selected. If multiple devices are being
polled, then selected polling rate options can be disabled
to account for the longer time it takes to read all devices.
To stop polling, press the
Auto Polling Off
button on the
status bar. Polling automatically stops if items in the
File
menu or
Connection
menu are selected. Polling also
stops if any buttons that involve action with the NV fault
log or flash are pressed.
Menu and Status Bar
The
GUI Lock
menu item allows the user to safely browse
a configuration by preventing all controls from writing to
registers. The
Clear Faults
button in the status bar sends
the CLEAR_FAULTS (03h) command to clear any faults
or warnings. To turn the power supplies on or off, select
the
Power On/Power Off
button, which writes a value to
the OPERATION (01h) command. The supplies power
on with margining off and power off based on the
Power
Down Action
drop-down list on the
Sequencing
tab.
Status Log
The status log below the tabs displays all the actions that
the GUI performs. Whenever a PMBus command is read
or written, the action is confirmed by the log. To save the
log, press the
Save Log
button and the text in the box is
saved to a .TXT file. The log can also be cleared by press-
ing the
Clear Log
button.
The
Sequencing
tab sheet (Figure 1) includes all the
sequence configuration and delays. All values on the tab
are read when the tab is selected. The
On/Off Config
group box controls write to the ON_OFF_CONFIG (02h)
command to set when the power supplies sequence
on or off. The power supplies can be turned on with
bias, with the CONTROL0/CONTROL1 pin, or with the
OPERATION (01h) command by selecting the option on
the
Turn Power Supplies ON
drop-down list. To change
the CONTROL0/CONTROL1 pin’s polarity, select the
Active Low
or
Active High
radio buttons. The chan-
nels can be powered down simultaneously or with a
TOFF delay by selecting the option in the Power
Down
Action
drop-down list. To edit the sequencing table, the
Output Select
on the
PSEN/GPO
tab must be set to
Power Supply Enable (PSEN)
and the
Input Select
on
the
Monitoring
tab must be set to
Sequence + Voltage
Monitor.
The
Sequence On Select, PG/GPI Select,
and
SEQ Match
columns read/write to MFR_SEQ_CONFIG
(E8h). The PG/GPI
Select
columns can only be edited if
the
Sequence On Select
for that channel is set to one of
the
PG/GPI combo
options. To edit the
SEQ Match
col-
umn the
Sequence On Select
for that channel must be
set to one the of
SEQ Pin Match
options. The sequencing
delays can be set by writing values to
TON Delay (TON_
DELAY 60h), TON
Max (TON_MAX_FAULT_LIMIT 62h),
TON Seq Max
(MFR_TON_SEQ_MAX E6h), and
TOFF
Delay (TOFF_DELAY 64h). Each channel responds to the
FAULT pins selected in the
FAULT Pin Response
col-
umns that read/write to MFR_FAULT_RESPONSE (D9h).
Sequencing Tab
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MAX34451 Evaluation Kit
Evaluates: MAX34451
Figure 1. MAX34451 EV Kit GUI (Sequencing Tab)
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