MAX6876EVCMOD2 [MAXIM]

Complete Evaluation System;


型号：	MAX6876EVCMOD2
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Complete Evaluation System
文件：	总11页 (文件大小：803K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-3635; Rev 0; 9/05

MAX6876 Evaluation Kit/Evaluation System

General Description

Features

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.

♦ Proven PC Board Layout

♦ Complete Evaluation System

♦ Convenient On-Board Test Points and

Connectors

♦ Fully Assembled and Tested

The evaluation software (EV software) runs under

Windows^®98/2000/XP, providing a convenient user

interface to exercise the features of the MAX6876.

Ordering Information

PART

TEMP RANGE INTERFACE TYPE

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.

MAX6876EVKIT

0°C to +70°C

User supplied

Windows software,

RS-232 port

MAX6876EVCMOD2

0°C to +70°C

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.

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.

MAX6876 EV Kit

Component List

MAX6876 Stand-Alone EV Kit

DESIGNATION QTY

DESCRIPTION

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.

10µF ceramic capacitors

KEMET C0805C106K9PACTU

C1–C4

C5–C8

Not installed

Nichicon UUD1H221MNL1GS

Not installed

KEMET C0805C106K9PACTU

C9–C12

C13–C16

MAX6876 EV System

1µF ceramic capacitors

KEMET C0805C105K8RACTU

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.

1206 surface-mount LEDs

Fairchild Semiconductor

QTLP650D4TR

CR1–CR6

J1–J9, J11,

J12

Banana plug receptacles

Keystone Electronics 6095

MAX6876 EV System

Component List

20-pin right-angle header

Samtec SSW-110-02-S-D-RA

J10

PART

MAX6876EVKIT

CMOD232

QTY

DESCRIPTION

MAX6876 evaluation kit

Command module

JMP1, JMP2,

JMP6

3-pin headers, 0.1in centers

Samtec TSW-103-07-F-S

JMP3, JMP4,

JMP5, JMP7

2-pin headers, 0.1in centers

Samtec TSW-102-07-F-S

MAX6876 EV Kit

Software

User-interface software

20V logic-level n-channel MOSFETs

International Rectifier IRLR3714Z

Q1–Q4

Windows is a registered trademark of Microsoft Corp.

______________________________________________________________________________________

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

Component List (continued)

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

Surface-mount resistor (0805) (not

installed)

10kΩ surface-mount resistors (0805)

Panasonic ERJ-6GEYJ103V

R16, R18

SW1

Surface-mount resistor (0805) ) (not

installed)

Tactile switch, J-lead, E-switch

TL3301NF160QJ

R3–R6,

R12–R15, R17

100kΩ surface-mount resistors (0805)

Panasonic ERJ-6GEYJ104V

Triple-turret terminals

Keystone Electronics 1598-2

TP1–TP23

750Ω surface-mount resistors (0805)

Panasonic ERJ-6GEYJ751V

MAX6876 power-supply sequencer

Maxim MAX6876ETX

R7–R11

Component Suppliers

SUPPLIER

PHONE

WEBSITE

E-Switch

763-504-3525

800-341-0392

310-252-7105

864-963-6300

718-956-8900

858-824-1515

800-344-2112

800-726-8329

www.e-switch.com

Fairchild Semiconductor

International Rectifier

KEMET

www.fairchildsemiconductor.com

www.irf.com

www.kemet.com

Keystone Electronics

Nichicon

www.keyelco.com

www.nichicon-us.com

www.panasonic.com/industrial

www.samtec.com

Panasonic

Samtec

Note: Indicate that you are using the MAX6876 when contacting these component suppliers.

Procedure

Quick Start

Required Equipment

Before you begin, the following equipment is needed:

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.

•

Maxim MAX6876EVCMOD2 (contains MAX6876 EV

kit board and CMOD232 module)

DC power supply, 9V DC at 200mA (included with

CMOD232 module)

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.

Windows 98/2000/XP computer with an available

serial (COM) port

Standard 9-pin female-to-male straight-through seri-

al cable

3) Ensure JMP3 is not shorted for normal operation

(non-MARGIN functionality). See Table 3.

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.)

4) Ensure that shorting links at JMP4 and JMP5 are

installed to set the desired I C address as shown in

Table 4. The MAX6876 EV kit I C address must

correspond with the I C address set in the evalua-

tion software.

•

Test leads with 0.175in banana plugs to connect

the MAX6876 EV kit board to power supplies

_______________________________________________________________________________________

MAX6876 Evaluation Kit/Evaluation System

5) Set JMP6 to provide either V

or ABP voltage to

Click the system menu on the MAX6876 EV software and

the V

net. The V

net must be connected

select Connect. A dialog box opens with pulldown

LOGIC

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.

menus for COM port selection and I C slave address.

Alternatively, clicking the Auto Detect checkbox causes

the EV software to search serial ports COM1–COM4 and

valid I C addresses for a MAX6876 EV kit. Click the

Be sure to remove resistors R7–R10 if V

is to

Connect button for the EV software to establish I C com-

LOGIC

be connected to ABP. Refer to the ABP section of

the MAX6876 IC data sheet.

munication. If connection cannot be established,

recheck electrical connections, COM port assignment,

and the I C slave address.

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

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.

net of the MAX6876EVKIT. See Figure 3

LOGIC

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.

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.

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.

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.

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.

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.

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.

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.

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 C

address, per Table 4.

_______________________________________________________________________________________

MAX6876 Evaluation Kit/Evaluation System

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.

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.

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-

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

_______________________________________________________________________________________

MAX6876 Evaluation Kit/Evaluation System

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.

clicking the Send Enable Command button. If the

Allow enable with I C checkbox is not checked, the

MAX6876 ignores the I C enable command bit. When

I C enable is allowed by setting register 09h bit to 1,

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 MAX6876 internal ENABLE is the result of an AND

condition between the I 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.

The I C Enable box allows or prevents power sequenc-

ing/tracking to be enabled through the I C interface. By

clicking the Allow enable with I C checkbox, power

sequencing/tracking can be enabled or disabled by

_______________________________________________________________________________________

MAX6876 Evaluation Kit/Evaluation System

Connector J10 mates with the Maxim CMOD232 mod-

ule, which enables communication with evaluation soft-

ware running on a PC. As a convenience, the CMOD232

module provides 5V DC power to the VLOGIC net

through pin 1 of J10 and JMP7. This voltage can be

used to power U1 by placing a shorting link in position

2–3 of JMP6.

System Menu

The System menu is used to initiate the serial commu-

nication connection between the MAX6876 EV kit board

and the evaluation software. It can also be used to

assert a software reset of the MAX6876 by selecting the

Reboot Target option. Other functions available from

the System menu include Commit Configuration to

EEPROM and Lock Configuration, both of which are

functionally equivalent to their corresponding controls

on the Advanced tab.

User-provided power supplies at J1–J4 are controlled

as the IN1–IN4 voltages, and are sequenced or tracked

as OUT1–OUT4 at J5–J8. These jacks accept a stan-

dard 0.175in tip-jack (banana plug) connector. Ground

connections can be established at J9, J11, and at test

points TP21 and TP23.

Evaluation software configuration values can also be

saved to disk for future reference. Opening a saved

configuration file restores the previously saved configu-

ration values to the registers of the connected

MAX6876 EV kit.

The MAX6876 EV kit is designed with 0.050in traces of

1oz copper for the main power paths. Each IN_/OUT_

pair safely handles up to 5A. Proceed with caution if

higher current operation is required.

Colors Menu

The Colors menu selections and dialog boxes allow the

user to adjust evaluation software display colors to suit

individual preference. Be sure to choose contrasting

colors so that all display features remain visible.

Light-emitting diodes CR1–CR4 indicate the status of

the PG_ signals. A green LED indicates that power is

good. The PG_ signals can be monitored at test points

TP17–TP20. Likewise, CR5 indicates the status of the

REM signal.

Detailed Description

of Hardware

Jumper Function Tables

Tables 1 through 5 describe the EV kit configuration

jumper functions. For a detailed understanding of the

jumpers, see Figure 3, the MAX6876 EV kit schematic.

The MAX6876 (U1) is mounted on an evaluation board

that includes all necessary support components for a

typical application circuit. The user power-supply input

(V , banana jack J12) is bypassed near U1 by 1µF

capacitor C13, and the internal supply voltage is

bypassed by 1µF capacitor C14.

Table 2. Jumper JMP2, ENABLE

The controlled IN_/OUT_ pairs are each bypassed with

10µF capacitors C1–C4. Additional surface-mount com-

ponent leads are included for larger bypass caps if

desired, such as C5–C8. The OUT_ voltages are simi-

larly provided with surface-mount lands for capacitors

C9–C12. Capacitors C5–C8 and C9–C12 are not

installed in the default configuration of the EV kit board,

and are not required in most applications.

JMP2 SHUNT

FUNCTION

POSITION

1-2

2-3

Voltage tracking/sequencing enabled

Voltage tracking/sequencing disabled

Evaluation software control of ENABLE

through CMOD232 module

Open

Table 1. Jumper JMP1, TRKEN

Table 3. Jumper JMP3, MARGIN

JMP3 SHUNT

FUNCTION

POSITION

JMP1 SHUNT

FUNCTION

POSITION

Adjust undervoltage-lockout threshold

using resistor-dividers R1 and R2

1-2

MARGIN function enabled

1-2

Normal operation; MARGIN function

disabled, or under evaluation software

control through CMOD232 module

Normal operation; UVLO threshold is

1.285V

2-3

Open

_______________________________________________________________________________________

MAX6876 Evaluation Kit/Evaluation System

Table 4. Jumpers JMP4 and JMP5, I C Slave Address Selection

MAX6876 I C ADDRESS

JMP4 SHUNT

POSITION

JMP5 SHUNT

POSITION

(BIT 3)

(BIT 2)

BINARY

HEXADECIMAL

1-2

Open

1-2

101000xx

101001xx

101010xx

101011xx

A0h

A4h

A8h

ACh

Open

Table 5. Jumper JMP6

JMP6 SHUNT

POSITION

FUNCTION

CAUTIONARY NOTES

Resistors R7–R10 must be removed to prevent

loading ABP pin of MAX6876

1-2

supplied from ABP pin of MAX6876

LOGIC

2-3

connected to V net (J12)

—

LOGIC

Open

supplied from pin 1 of J10 or TP22

Table 6. Jumper JMP7, CMOD232 Power Connection

JMP7 SHUNT

FUNCTION

POSITION

CAUTIONARY NOTES

receives power from CMOD232 module

If shunt at JMP7 is installed, do not connect external

voltage to TP22

LOGIC

1-2

through pin 1 of J10

No connection between CMOD232 module and

Open

—

LOGIC

_______________________________________________________________________________________

MAX6876 Evaluation Kit/Evaluation System

O U T 3

T E 3 G A

I N 3

O U T 2

A 1

2 8

G A T E 3 2 9

3 0

1 8

1 7

1 6

1 5

1 4

1 3

A 0

S C L

S D A

M R

3 1

T E 2 G A

I N 2

M R

G A T E 2 3 2

3 3

N . C .

O U T 1

T E 1 G A

I N 1

M A R G I N

1 2

M A R G I N

E N A B L E

3 4

E N A B L E

1 1

G A T E 1 3 5

3 6

R E S E T

1 0

Figure 3. MAX6876 EV Kit Schematic

_______________________________________________________________________________________

MAX6876 Evaluation Kit/Evaluation System

Figure 4. MAX6876 EV Kit Component Placement Guide—Component Side

_______________________________________________________________________________________

MAX6876 Evaluation Kit/Evaluation System

Figure 5. MAX6876 EV Kit PC Board Layout—Top Layer

10 ______________________________________________________________________________________

MAX6876 Evaluation Kit/Evaluation System

Figure 6. MAX6876 EV Kit PC Board Layout—Bottom Layer

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

Printed USA

is a registered trademark of Maxim Integrated Products, Inc.

MAX6876EVCMOD2 [MAXIM]

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