19-3635; Rev 0; 9/05
MAX6876 Evaluation Kit/Evaluation System
General Description
The MAX6876 evaluation system (EV system) consists
of a MAX6876 evaluation kit (EV kit) and a Maxim
CMOD232 command module. The MAX6876 EEPROM-
programmable quad power-supply tracker/sequencer
circuit monitors four system voltages and ensures prop-
er power-up and power-down conditions for systems
requiring voltage tracking and/or sequencing.
The evaluation software (EV software) runs under
Windows
®
98/2000/XP, providing a convenient user
interface to exercise the features of the MAX6876.
Order the complete EV system (MAX6876EVCMOD2)
for a comprehensive evaluation of the MAX6876 using a
PC. Order just the EV kit (MAX6876EVKIT) if the com-
mand module has already been purchased with a pre-
vious Maxim EV system, or if the EV kit is desired for
custom development in conjunction with other micro-
controller-based systems.
This evaluation system data sheet assumes the reader
has a basic familiarity with the MAX6876 IC. Refer to
the MAX6876 IC data sheet for detailed specifications
and operating instructions.
♦
Proven PC Board Layout
♦
Complete Evaluation System
♦
Convenient On-Board Test Points and
Connectors
♦
Fully Assembled and Tested
Features
Evaluate: MAX6876
Ordering Information
PART
MAX6876EVKIT
MAX6876EVCMOD2
TEMP RANGE
0°C to +70°C
0°C to +70°C
INTERFACE TYPE
User supplied
Windows software,
RS-232 port
Note:
The MAX6876 evaluation software is designed for use with
the complete EV system MAX6876EVCMOD2 (includes
CMOD232 module together with MAX6876EVKIT). If the
MAX6876 EV software will not be used, the MAX6876EVKIT
board can be purchased by itself without the CMOD232 module.
MAX6876 Stand-Alone EV Kit
The MAX6876 EV kit provides a proven PC board layout
to facilitate evaluation of the MAX6876. It must be inter-
faced to appropriate serial communication signals for
proper operation. Connect power, ground return, and
SCL/SDA interface signals to the breakout header pins
(see Figure 3). The load-switching FETs can control up
to four supply rails. Refer to the MAX6876 IC data sheet
for serial-data timing and electrical requirements.
DESIGNATION
C1–C4
C5–C8
C9–C12
C13–C16
QTY
4
0
0
4
MAX6876 EV Kit
Component List
DESCRIPTION
10µF ceramic capacitors
KEMET C0805C106K9PACTU
Not installed
Nichicon UUD1H221MNL1GS
Not installed
KEMET C0805C106K9PACTU
1µF ceramic capacitors
KEMET C0805C105K8RACTU
1206 surface-mount LEDs
Fairchild Semiconductor
QTLP650D4TR
Banana plug receptacles
Keystone Electronics 6095
20-pin right-angle header
Samtec SSW-110-02-S-D-RA
3-pin headers, 0.1in centers
Samtec TSW-103-07-F-S
2-pin headers, 0.1in centers
Samtec TSW-102-07-F-S
20V logic-level n-channel MOSFETs
International Rectifier IRLR3714Z
MAX6876 EV System
The MAX6876 EV system software runs under Windows
98/2000/XP on an IBM-compatible PC, interfacing to the
EV system through the computer’s serial communica-
tions port. See the
Quick Start
section for setup and
operating instructions.
CR1–CR6
J1–J9, J11,
J12
J10
JMP1, JMP2,
JMP6
JMP3, JMP4,
JMP5, JMP7
Q1–Q4
6
11
1
3
4
4
MAX6876 EV System
Component List
PART
MAX6876EVKIT
CMOD232
MAX6876 EV Kit
Software
QTY
1
1
1
DESCRIPTION
MAX6876 evaluation kit
Command module
User-interface software
Windows is a registered trademark of Microsoft Corp.
______________________________________________________________________________________
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX6876 Evaluation Kit/Evaluation System
Evaluate: MAX6876
Component List (continued)
DESIGNATION
R1
R2
R3–R6,
R12–R15, R17
R7–R11
QTY
0
0
9
5
DESCRIPTION
Surface-mount resistor (0805) (not
installed)
Surface-mount resistor (0805) ) (not
installed)
100kΩ surface-mount resistors (0805)
Panasonic ERJ-6GEYJ104V
750Ω surface-mount resistors (0805)
Panasonic ERJ-6GEYJ751V
DESIGNATION
R16, R18
SW1
TP1–TP23
U1
QTY
2
1
23
1
DESCRIPTION
10kΩ surface-mount resistors (0805)
Panasonic ERJ-6GEYJ103V
Tactile switch, J-lead, E-switch
TL3301NF160QJ
Triple-turret terminals
Keystone Electronics 1598-2
MAX6876 power-supply sequencer
Maxim MAX6876ETX
Component Suppliers
SUPPLIER
E-Switch
Fairchild Semiconductor
International Rectifier
KEMET
Keystone Electronics
Nichicon
Panasonic
Samtec
PHONE
763-504-3525
800-341-0392
310-252-7105
864-963-6300
718-956-8900
858-824-1515
800-344-2112
800-726-8329
WEBSITE
www.e-switch.com
www.fairchildsemiconductor.com
www.irf.com
www.kemet.com
www.keyelco.com
www.nichicon-us.com
www.panasonic.com/industrial
www.samtec.com
Note:
Indicate that you are using the MAX6876 when contacting these component suppliers.
Quick Start
Required Equipment
Before you begin, the following equipment is needed:
• Maxim MAX6876EVCMOD2 (contains MAX6876 EV
kit board and CMOD232 module)
•
•
•
•
DC power supply, 9V DC at 200mA (included with
CMOD232 module)
Windows 98/2000/XP computer with an available
serial (COM) port
Standard 9-pin female-to-male straight-through seri-
al cable
DC power supplies capable of providing 0 to 5V for
up to four channels of sequenced and/or tracked
power through the MAX6876 EV system. (Power-
supply current requirements depend on user con-
figuration and application.)
Test leads with 0.175in banana plugs to connect
the MAX6876 EV kit board to power supplies
Procedure
Do not turn on any power supplies until all connec-
tions are completed:
1) Set JMP1 to the 2-3 position for normal UVLO oper-
ation. See Table 1. If JMP1 is set to the 1-2 position,
install appropriate resistors at R1 and R2 to set the
desired UVLO voltage.
2) Set JMP2 to the 1-2 position to enable voltage
tracking/sequencing. Leaving JMP2 open allows
remote hardware control of the ENABLE pin
through the CMOD232 module. See Table 2.
3) Ensure JMP3 is not shorted for normal operation
(non-MARGIN functionality). See Table 3.
4) Ensure that shorting links at JMP4 and JMP5 are
installed to set the desired I
2
C address as shown in
Table 4. The MAX6876 EV kit I
2
C address must
correspond with the I
2
C address set in the evalua-
tion software.
•
2
_______________________________________________________________________________________
MAX6876 Evaluation Kit/Evaluation System
5) Set JMP6 to provide either V
CC
or ABP voltage to
the V
LOGIC
net. The V
LOGIC
net must be connected
to ABP if the MAX6876 is to be powered from one
of the voltage-detector inputs (IN1–IN4), and the
CMOD232 module is not connected (or if JMP7 is
open). See Figure 3 and Table 5 for JMP6 settings.
Be sure to remove resistors R7–R10 if V
LOGIC
is to
be connected to ABP. Refer to the ABP section of
the MAX6876 IC data sheet.
6) Place a shorting link at JMP7 if the MAX6876EVKIT
logic is to be powered from the CMOD232 module.
This connects the CMOD232 +5V supply to the
V
LOGIC
net of the MAX6876EVKIT. See Figure 3
and Table 6.
7) Carefully connect the EV kit and CMOD232 module
by aligning and fully mating the 20-pin header and
socket, P3 of the CMOD232 module and J10 of the
MAX6876EVKIT.
8) Connect a cable from the computer serial port to
the CMOD232 module. If using a 9-pin serial port,
use a straight-through female-to-male cable. If the
PC has a 25-pin serial connector, a standard 25-pin
to 9-pin adapter is required.
9) Install the evaluation software on your computer by
running the INSTALL.EXE program on the CD. The
program files are copied and icons are created in
the Windows Start menu.
10) Connect the DC power supply to the CMOD232
module at input jack P1.
11) Start the MAX6876 evaluation software by clicking
the program icon in the Start menu.
Click the system menu on the MAX6876 EV software and
select
Connect.
A dialog box opens with pulldown
menus for COM port selection and I
2
C slave address.
Alternatively, clicking the
Auto Detect
checkbox causes
the EV software to search serial ports COM1–COM4 and
valid I
2
C addresses for a MAX6876 EV kit. Click the
Connect
button for the EV software to establish I
2
C com-
munication. If connection cannot be established,
recheck electrical connections, COM port assignment,
and the I
2
C slave address.
After the evaluation software locates the CMOD232
module and the MAX6876EVKIT board, the software
polls the configuration registers and updates the dis-
play every 500ms to reflect the current configuration.
Evaluate: MAX6876
Overview Tab
The evaluation software
Overview
tab shows a graphi-
cal representation of the four available power-supply
IN_/OUT_ pairs, with many mouse-sensitive features.
Figure 1 shows the appearance of the
Overview
tab for
a typical configuration.
Clicking and dragging any of the four power-supply
ramp waveforms allows OUT_ tracking assignment to
each of the four sequential ramps. The undervoltage/
overvoltage thresholds for each IN_/OUT_ pair can be
adjusted graphically or with the keyboard. To enter the
undervoltage or overvoltage thresholds using the key-
board, click the numeric threshold values on the left
side of the
Overview
tab and a dialog box will open.
This dialog box also allows selection of the threshold
increments, either 10mV or 20mV.
Underlined text on the
Overview
tab is used to repre-
sent configuration register values that can be adjusted
by selecting from a pulldown list. Other features, such
as
Fault Behavior
and
Power-Down Mode,
are config-
ured by radio buttons. The graphical representation of
the IN_/OUT_ pairs changes to reflect
Simultaneous-
or
Reverse-Order Power-Down Mode.
For each IN_/OUT_ pair, a checkbox allows selection of
the 100Ω
Pulldown
resistance, and the adjustable
Overcurrent Threshold
can also be enabled or dis-
abled for each pair. Checking the
Overcurrent
Threshold
box for an IN_/OUT_ pair causes that chan-
nel to assert the
OC
output if the OUT_ voltage drops
below the selected overcurrent threshold percentage.
The
Assert
RESET
checkboxes determine which OUT_
detectors assert the
RESET
output.
Detailed Description
of Software
Connecting to the MAX6876EVKIT
To connect to the MAX6876 EV kit, ensure that header
P3 of the CMOD232 module is plugged into J10 of the
MAX6876 EV kit and that both boards have power.
Note:
Power can be supplied to the MAX6876 EV kit from
the CMOD232 module by installing a shorting link at
JMP7. This shorting link must be removed if the MAX6876
EV kit is to operate from another supply voltage.
Connect the CMOD232 module to an available serial
port on your PC using a standard straight-through
female-to-male 9-pin cable. Set jumpers JMP4 and
JMP5 on the MAX6876 EV kit to select the desired I
2
C
address, per Table 4.
_______________________________________________________________________________________
3
MAX6876 Evaluation Kit/Evaluation System
Evaluate: MAX6876
Figure 1. Evaluation Software Overview Tab
Any changes made to the configuration parameters on
the
Overview
tab result in a corresponding change in
the MAX6876 configuration registers for the connected
MAX6876 EV kit. If configuration changes are made
and no MAX6876 EV kit is connected, a warning dialog
box will appear. Any changes made while disconnect-
ed are lost when connection is established.
Advanced Tab
The
Advanced
tab provides a detailed indication of the
current
Register Values
in a table format. Values can
be changed by selecting the appropriate field with the
mouse cursor. Values are shown for both the volatile
configuration registers and the corresponding non-
volatile EEPROM locations. Figure 2 shows the appear-
ance of the
Advanced
tab for a typical configuration.
Configuration register values can be stored in the con-
figuration EEPROM by clicking on the
Commit
Configuration
button. Clicking the
Locked
checkbox
disables both register and EEPROM writes by setting
bit 2 of register 13h. To lock the EEPROM values, set
bit 2 of EEPROM location 33h.
Note:
To unlock the EEPROM, first clear bit 2 of config-
uration register 13h, then clear bit 2 of EEPROM loca-
tion 33h.
The
Input Pin’s State
box allows software remote con-
trol of the logic-level voltage applied by the CMOD232
module to the
MARGIN,
ENABLE, and
MR
pins of the
4
_______________________________________________________________________________________
MAX6876 Evaluation Kit/Evaluation System
Evaluates: MAX6876
Figure 2. Evaluation Software Advanced Tab
MAX6876, as long as the shorting links on JMP3 and
JMP2 are not installed. Physical jumper settings over-
ride any selections made in this box.
The MAX6876 can be configured to use its internal ref-
erence voltage or an external reference by selecting
the appropriate radio button in the
Reference Voltage
box. If you choose to use an external reference, be sure
to physically connect a precision voltage source at test
point TP16 on the MAX6876 EV kit board. Selecting
external reference while none is connected causes the
part to repeatedly enter fault condition.
The I
2
C
Enable
box allows or prevents power sequenc-
ing/tracking to be enabled through the I
2
C interface. By
clicking the
Allow enable with I
2
C
checkbox, power
sequencing/tracking can be enabled or disabled by
clicking the
Send Enable Command
button. If the
Allow enable with I
2
C
checkbox is not checked, the
MAX6876 ignores the I
2
C enable command bit. When
I
2
C enable is allowed by setting register 09h bit to 1,
the MAX6876 internal ENABLE is the result of an AND
condition between the I
2
C command bit (register 09h,
bit 0) and the logic ENABLE input at pin 11. Refer to the
logic ENABLE diagram in the MAX6876 data sheet.
The
Fault Log
box records the most recently detected
fault states. If the
Fault Log
box is full, a scrollbar
allows review of up to 1024 past fault messages. The
date and time data are from the PC clock.
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5
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