General Description
The MAX6884 evaluation system (EV system) consists
of a MAX6884 evaluation kit (EV kit) and a Maxim
CMOD232 command module. The MAX6884 EEPROM-
configurable, multivoltage supply supervisor monitors
six voltage-detector inputs and an auxiliary input. The
MAX6884 also features programmable outputs for high-
ly configurable power-supply supervisory applications.
The evaluation software runs under Windows®98/
2000/XP, providing a handy user interface to exercise
the features of the MAX6884.
Order the complete EV system (MAX6884EVCMOD2)
for comprehensive evaluation of the MAX6884 using a
personal computer. Order the EV kit (MAX6884EVKIT) if
the command module has already been purchased
with a previous Maxim EV system, or for custom use in
other µC-based systems.
MAX6884 Stand-Alone EV Kit
The MAX6884 EV kit provides a proven PC board layout
to facilitate evaluation of the MAX6884. It must be inter-
faced to appropriate timing signals for proper opera-
tion. Connect 3.3V power, ground-return, and SCL/SDA
interface signals to the breakout header pins (see
Figure 8). The LEDs are optional circuits, which can be
powered separately or disabled altogether. Refer to the
MAX6884 data sheet for timing requirements.
MAX6884 EV System
The evaluation software runs under Windows
98/2000/XP on an IBM PC, interfacing to the EV system
board through the computer’s serial communications
port. See the Quick Start section for setup and operat-
ing instructions.
Features
♦Proven PC Board Layout
♦I2C*-Compatible 2-Wire Serial Interface
♦Easy-to-Use Menu-Driven Software
♦Assembled and Tested
♦Includes Windows 98/2000/XP-Compatible Software
and Demo PC Board
♦Also Evaluate MAX6885
Evaluate: MAX6884/MAX6885
MAX6884 Evaluation System/Evaluation Kit
________________________________________________________________ Maxim Integrated Products 1
19-3723; Rev 0; 6/05
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.
Component List
DESIGNATION
QTY
DESCRIPTION
C1–C6
6
0.1µF ±20%, 10V X5R ceramic
capacitors (0402)
TDK C1005X5R1A104M
C8, C9
2
1.0µF ±20%, 6.3V X5R ceramic
capacitors (0402)
TDK C1005X5R0J105M
D1, D2, D3
3
Green surface-mount LEDs (SS)
J1–J4
4
5-pin headers (cut to fit)
J5
1
2 x 10 right-angle female receptacle
JU1–JU4
4
Jumper, 3-pin headers
JU5
1
Jumper, 2-pin header
R1, R2, R3
3
620Ω ±5% resistors (1206)
R4, R5, R6
3
10kΩ ±5% resistors (0603)
R7, R8
0
Not installed, resistors (0603)
SW1
1
Momentary pushbutton switch (NO)
U1
1
Maxim MAX6884ETP (20-pin TQFN
5mm x 5mm)
None
5
Shunts
None
1
MAX6884 PC board
None
1
Software disk (CD-ROM),
MAX6884 evaluation kit
PA R T T EM P
R A N G E
I C -
PA C K A G E
I
2C
I N T ER F A C E
T YPE
M A X6 8 8 4 EVK IT 0°C to + 70°C 20 TQ FN U ser
S up p l i ed
M A X6 8 8 4 EVC M O D 2 0°C to + 70°C 20 TQ FN C M O D 232
Ordering Information
Note: To evaluate the MAX6885, request a MAX6885ETP free
sample with the MAX6884EVKIT.
The MAX6884 EV kit software is provided with the MAX6884 EV
kit; however, the CMOD232 board is required to interface the
EV kit to the computer when using the included software.
Windows is a registered trademark of Microsoft Corp.
SMBus is a trademark of Intel Corp.
*Purchase of I2C components of Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I2C Patent Rights to use these com-
ponents in an I2C system, provided that the system conforms
to the I2C Standard Specification as defined by Philips.
Evaluate: MAX6884/MAX6885
Quick Start
Recommended Equipment
•Maxim MAX6884EVCMOD2 (contains MAX6884 EV
kit board and CMOD232 module)
•DC power supply, 9VDC at 200mA (included with
CMOD232 module)
•Computer running Windows 98, 2000, or XP with a
spare serial (COM) port
•Standard 9-pin, straight-through, male-to-female
cable (serial extension cable) to connect the com-
puter’s serial port to the Maxim command module
interface board
•DC power supply, 3.3V at 100mA
Procedure
The MAX6884 EV kit is fully assembled and tested.
Follow the steps below to verify board operation. Do
not turn on the power supply until all connections
are completed:
Command Module Setup
1) Enable the SDA/SCL pullup resistors on the com-
mand module by setting both switches (SW1) to the
on position.
2) Set the command module working voltage to 3.3V
by placing a shunt across pins 1-2 of the VDD
select jumper (J1).
3) Connect a cable from the computer’s serial port to
the command module (CMOD232) interface board.
Use a straight-through 9-pin male-to-female cable.
To avoid damaging the EV kit or your computer, do
not use a 9-pin null-modem cable or any other pro-
prietary interface cable that is physically similar to
the straight-through cable.
4) Connect the provided wall cube power supply to
the CMOD232 board.
EV Kit Setup
5) Ensure that the I2C address of the MAX6884 is set
to 0xA0h by verifying that a shunt is placed across
pins 2-3 of jumper JU4.
6) Ensure that shunts are installed across pins 2 and 3
of jumpers JU1, JU2, and JU3.
7) Ensure that a shunt is NOT installed on jumper JU5.
8) Connect the 3.3V DC power supply to the VLED
and GND pads.
9) Connect the 3.3V DC power supply to the VCC and
GND pads.
10) Carefully align the 20-pin connector of the
MAX6884 EV kit with the 20-pin header of the
CMOD232 interface board. Gently press them
together.
11) The MAX6884.EXE software program can be run
from the CD-ROM or hard drive. Use the
INSTALL.EXE program to copy the files and create
icons in the Windows 98/2000/XP Start menu.
12) Plug the CMOD232 wall cube into an electrical outlet.
13) Turn on the 3.3V power supply.
14) Start the MAX6884 program by opening its icon in
the Start menu.
15) Normal device operation can be verified by the
“Status: MAX6884 Operational” text in the inter-
face box.
Detailed Description of Software
Main Window
The evaluation software’s main window (Figure 1) con-
sists of an Interface diagnostic box, an ADC
Conversion Results box, the MAX6884 Control Tabs
(see below) and some system-level controls.
The Interface box indicates the current Device informa-
tion, the Register address, I2C SCL Speed, and the
Data sent or received for the last read/write operation.
Select the installed device Part # and Address using
the appropriate controls. The double arrows (>> or <<)
indicate the direction of the data flow; where >> indi-
cates that the master (CMOD232 board) device is trans-
mitting data to the slave (MAX6884) and << indicates
that the master device is receiving data from the slave.
The software polls the checked ADC conversion regis-
ters of the MAX6884 every 500ms. To stop reading
these registers, uncheck the appropriate checkbox in
the ADC Conversion Results section of the MAX6884
software. Select the desired reference type (Internal or
External) from the Reference drop-down box. Enter
MAX6884 Evaluation System/Evaluation Kit
2_______________________________________________________________________________________
Component Suppliers
SUPPLIER PHONE FAX WEBSITE
TDK 847-803-6100 847-390-4405 www.component.tdk.com
Note: Indicate that you are using the MAX6884/MAX6885 when contacting this component supplier.
the reference voltage in the adjacent box when using
the External reference feature.
The MAX6884 EV kit software continuously polls the
MAX6884 to make sure the two boards have not become
inadvertently disconnected. An undesired result of this
polling is constant activity on the I2C-compatible bus. This
feature may make it difficult to monitor the I2C-compatible
bus for desired bit patterns. Disable this feature by
checking the Silence I2CBus Activity checkbox.
Automatic Diagnostics are required to ensure that
the CMOD232 board does not become disconnected
from the PC. Disable this function by resetting the
Automatic Diagnostics checkbox.
Click the Reboot button to initiate a software reboot.
Force the MAX6884 to draw power from the VCC pin
(instead of an IN_ pin) by checking the Power
MAX6884 from VCC checkbox.
WARNING: Improper use of the Power MAX6884 from
VCC checkbox may cause damage to the device and
EV kit. Refer to the Powering the MAX6884/MAX6885
section in the MAX6884/MAX6885 data sheet for details
on how to correctly apply power to the MAX6884.
Status Bar
The status bar (Figure 2) displays the MAX6884 status
information and is updated every 500ms. Disable status
reads by unchecking the Automatic Status Read
checkbox. Force a manual status read by clicking the
Read Status button.
When a voltage monitor detects that the (A) or (B) thresh-
old is crossed, a fault condition is asserted. This fault
register status is displayed in the status bar. V2A_ indi-
cates that IN2 is under its A threshold, V3_B indicates
that IN3 has crossed its B threshold, and V6AB indicates
that IN6 has crossed both its A and B thresholds.
Evaluate: MAX6884/MAX6885
MAX6884 Evaluation System/Evaluation Kit
_______________________________________________________________________________________ 3
Figure 1. MAX6884 EV Kit Software Main Window
Figure 2. MAX6884 EV Kit Software Status Bar
Evaluate: MAX6884/MAX6885
If an output is asserted, that output is also displayed in
the status bar. RESET indicates that the RESET output
has been asserted. UV/OV indicates that the UV/OV
output has been asserted. WDO indicates that the
watchdog timer output has been asserted.
Voltage Monitor Tab
The Voltage Monitor tab (Figure 1) configures voltage
monitor thresholds and input impedance for the
MAX6884 IN1–IN6 inputs. Adjust the Range drop-
down, “A” Primary Threshold, and “B” Secondary
Threshold controls until the desired thresholds are set.
Press the Refresh button to read the current values
from the MAX6884. Press the Apply button to send the
software value to the MAX6884.
Outputs Tab
The outputs of the MAX6884 are triggered by the
logical AND of the selected control inputs. Select the
control inputs from the Output Configuration box
(Figure 3). Choose the output pin to modify from the
Programmable Output Pin drop-down on the Outputs
tab. Choose the Output Type and De-glitch Timer
Delay from the Output Characteristics box.
Press the Refresh button to read the current values
from the MAX6884. Press the Apply button to send the
software values to the MAX6884.
Watchdog Timer Tab
A watchdog timer asserts a fault condition after a peri-
od of time, unless the timer is periodically reset by the
WDI input pin being toggled. This fault register status is
displayed in the status bar as WDO. Configure the
watchdog timer settings from the Watchdog Timer tab
(Figure 4).
During normal operation, an enabled watchdog timer
must be serviced by toggling the WDI pin periodically
(“A” timeout duration). Typically an external piece of
firmware services the watchdog timer by toggling the
WDI pin inside a loop, and watchdog timer assertion is
configured to drive an output pin. Any software defect
that halts the firmware then causes the watchdog timer
to assert.
The initial timeout period (“B” timeout duration) can
be set to a longer value to allow time for software initial-
ization. Enable the watchdog timer by checking the
Enable Watchdog Timer checkbox. The desired
Output Type can also be programmed.
MAX6884 Evaluation System/Evaluation Kit
4_______________________________________________________________________________________
Figure 3. MAX6884 EV Kit Software Outputs Tab
Press the Refresh button to read the current values
from the MAX6884. Press the Apply button to send the
software values to the MAX6884.
Registers Tab
The Registers tab (Figure 5) displays the MAX6884
volatile working registers and their corresponding
EEPROM value. Pressing Refresh reads and displays
all register and EEPROM values. Individual register
bytes can be modified by selecting the appropriate
grid cell and typing two hexadecimal digits 0–9/A–F.
At power-up, the MAX6884 automatically loads its regis-
ters from the configuration EEPROM page. To store the
active register values into the configuration EEPROM,
press Commit to EEPROM. Prevent any software modi-
fications to the configuration registers and configuration
EEPROM by checking the Lock Configuration check-
box. Reset the Confirm Write checkbox to disable the
register write confirmation.
Register values can optionally be stored into a text file
on disk for later retrieval, using the Load Reg Values
from File and Save Reg Values to File buttons.
EEPROM Tab
The EEPROM tab (Figure 6) displays the nonvolatile
EEPROM memory contents of the MAX6884. Pressing
Refresh reads and displays the EEPROM contents on
the GUI. Individual memory bytes can be modified by
selecting the appropriate grid cell and typing two hexa-
decimal digits 0–9/A–F.
To disregard user EEPROM (0x40h to 0x7Fh) writes
when the UV/OV or RESET outputs are asserted, check
the EEPROM Write Depends on UV/OV or
EEPROM Write Depends on RESET checkboxes.
Refer to the MAX6884 data sheet for more details.
Reset the Confirm Write checkbox to disable the EEP-
ROM write confirmation.
EEPROM values can optionally be stored into a text file
on disk for later retrieval, using the Load from File and
Save to File buttons.
Simple I2C Commands
There are two methods for communicating with the
MAX6884: through the normal user-interface panel or
through the I2C commands available by selecting the 2-
Wire Interface Diagnostic item from the Options pull-
down menu. A window is displayed that allows I2C
operations, such as Read Byte and Write Byte, to be
executed. To stop normal user-interface execution so
that it does not override the manually set values, turn
off the update timer by unchecking the Automatic
Status Read and Automatic Diagnostics checkboxes.
Evaluate: MAX6884/MAX6885
MAX6884 Evaluation System/Evaluation Kit
_______________________________________________________________________________________ 5
Figure 4. MAX6884 EV Kit Software Watchdog Timer Tab
Evaluate: MAX6884/MAX6885
MAX6884 Evaluation System/Evaluation Kit
6_______________________________________________________________________________________
Figure 5. MAX6884 EV Kit Software Registers Tab
Figure 6. MAX6884 EV Kit Software EEPROM Tab
The I2C dialog boxes accept numeric data in binary,
decimal, or hexadecimal. Hexadecimal numbers should
be prefixed by $ or 0x. Binary numbers must be exactly
eight digits. See Figure 7 for an example of this tool.
Note: In places where the slave address asks for an 8-
bit value, it must be the 7-bit slave address of the
MAX6884 as determined by ADD, with the last bit set to
1 for a read operation or a zero for a write. Refer to the
MAX6884 data sheet for a complete list of registers and
functions.
Detailed Description of Hardware
The MAX6884 (U1) is surrounded by breakout header
pins J1–J4. The user power-supply inputs IN1–IN6 are
bypassed by capacitors C1–C6. Apply a 3.3V LED sup-
ply (optional) to the VLED and GND pads. Apply a VCC
supply (optional) to the VCC and GND pads. Monitor the
MAX6884 outputs at the RESET, UV/OV, and WDO pads.
Apply a watchdog timer input at the WDI pad. A pushbut-
ton switch (SW1) controls the manual reset input.
Address Selection
Jumper JU4 sets the MAX6884 I2C slave address. The
default address is 1010 01XY (ADD = GND). See Table
1 for a complete list of addresses.
Note: The first 7 bits shown are the address. Y (bit 0) is
the I2C read/write bit. This bit is a 1 for a read operation
or a zero for a write.
Evaluate: MAX6884/MAX6885
MAX6884 Evaluation System/Evaluation Kit
_______________________________________________________________________________________ 7
Figure 7. The above example shows a simple SMBusWriteByte operation using the included 2-Wire Interface Diagnostics. In this
example, the software is writing data (0x12) to Device Address 0xA4, Register Address 0x00. This will set the primary undervoltage
threshold for IN1A.
MAX6884 ADDRESS
SHUNT
POSITION
MAX6884
ADDRESS
PIN BINARY
HEXADECIMAL
1-2 VCC 1010 01XY
0xA4 or 0xA6
2-3* GND 1010 00XY
0xA0 or 0xA2
Table 1. Shunt Settings for I2C Address
(JU4)
X= Don’t care (refer to MAX6884 data sheet for more details).
*Default configuration: JU4 (2-3).
Evaluate: MAX6884/MAX6885
LED Indicator Control
The outputs (RESET, UV/OV, and WDO) of the MAX6884
are connected to some general output circuitry. Jumpers
JU1, JU2, and JU3, respectively, connect the outputs to
either a pullup resistor attached to VLED or an LED indi-
cator. See Table 2 for jumper settings.
MARGIN
Input
The MARGIN input of the MAX6884 allows system test-
ing when voltages are outside their normal ranges. JU5
controls this feature. It is expected that during normal
operation the MARGIN function will be disabled. See
Table 3 for jumper settings.
Evaluating the MAX6885
The MAX6884 EV kit is also capable of evaluating the
I2C-compatible MAX6885. To evaluate the MAX6885
replace the MAX6884 (U1) with a MAX6885ETP free
sample. Select the MAX6885 option from the Device,
Part # control located in the Interface box on the
MAX6884 EV kit software.
Using an Alternative I2C Interface
The MAX6884 EV kit provides pads and pullup resistor
placeholders that allow an alternative I2C-compatible
interface to be used. Connect the interface through the
SCL, SDA, and GND pads. Install pullup resistors at
positions R7 and R8 if required.
MAX6884 Evaluation System/Evaluation Kit
8_______________________________________________________________________________________
SHUNT POSITION
DESCRIPTION
1-2 Output pulled up to VLED
2-3* Output connected to LED indicator
Table 2. Output Control Circuitry (JU1,
JU2, JU3)
*Default configuration: JU1 (2-3), JU2 (2-3), JU3 (2-3).
SHUNT POSITION
DESCRIPTION
Not Installed* Normal operation
Installed RESET, UV/OV, and WDO outputs
held constant
Table 3. MARGIN Input (JU5)
*Default configuration: JU5 (not installed).
Evaluate: MAX6884/MAX6885
MAX6884 Evaluation System/Evaluation Kit
_______________________________________________________________________________________ 9
MAX6884
U1
JU1
VLED
2
3
1
1
J1-1
RESET
RESET
R4
10kΩ
VLED
R1
620Ω
D1
C8
1.0µF
14
DBP
J3-4
4
GND
J1-4
C9
1.0µF
13
VCC
VCC
J3-3
JU2
VLED
2
3
1
3
J1-3
UV/OV
UV/OV
R5
10kΩ
VLED
R2
620Ω
D2
JU3
VLED
2
3
1
2
J1-2
WDO
WDO
R6
10kΩ
VLED
R3
620Ω
D3
J1-5
5
WDI
WDI
C1
0.1µF
J4-5 20 IN1
C2
0.1µF
J4-4 19 IN2
C3
0.1µF
J4-3 18 IN3
C4
0.1µF
J4-2 17 IN4
C5
0.1µF
J4-1 16 IN5
C6
0.1µF
J3-5 15 IN6
J3-2 12 AUXIN
J3-1 11 REFIN
VCC
GND
VCC
VLED
GND
VLED
10
J2-5
A0
JU4
VCC
2
3
1
J2-1 6MR
SW1
J2-2 7MARGIN
JU5
J5-7 9SCL
J2-4
VLED
R7
OPEN
SCL
J5-11
J5-9
J5-13
J5-15
J5-17
J5-3
8SDA
J2-3
VLED
R8
OPEN
SDA
J5-2
J5-4
J5-20
J5-5
J5-1
J5-6
J5-8
J5-10
J5-12
J5-14
J5-16
J5-18
J5-19
Figure 8. MAX6884 EV Kit Schematic
Evaluate: MAX6884/MAX6885
MAX6884 Evaluation System/Evaluation Kit
10 ______________________________________________________________________________________
Figure 9. MAX6884 EV Kit Component Placement Guide—
Component Side
Figure 10. MAX6884 EV Kit PC Board Layout—Component
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
©2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
Evaluate: MAX6884/MAX6885
MAX6884 Evaluation System/Evaluation Kit
Figure 11. MAX6884 EV Kit PC Board Layout—Solder Side Figure 12. MAX6884 EV Kit Component Placement Guide—
Solder Side
