SMSC EVB-EMC1043 Manual de usuario

SMSC EMC1043/1053/1063 1 Revision 1.1 (12-14-06)

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EVB-EMC1043/1053/1063 User Manual

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EVB-EMC1043/1053/1063 User Manual

Revision 1.1 (12-14-06) SMSC EMC1043/1053/1063

1 Overview

The EMC1043/1053/1063 are SMBus temperature sensing ICs with 1 internal and 2 external sensors

in an 8 pin MSOP package. These 3 ICs are targeted at different applications as described in Table 1.1.

This evaluation board (EVB) has 2N3904 diode-connected transistors installed on the PCB for external

diodes 1 and 2. The Beta Compensation function is designed for CPU substrate diodes and is not

compatible with diode-connected transistors such as the 2N3904. For this reason, the EMC1043

default settings are over-ridden by the Register Manager’s initialization code so that Beta

Compensation is disabled.

If your evaluation process requires connecting the EVB to the thermal diodes on Intel or AMD CPUs,

you can modify the PCB by removing the 2N3904s and installing the headers (P2 and P3) for

connection to external diodes over cables. Alternately, you can order the EVB-EMC1043C/1063C,

which is configured with headers for CPU connection. Refer to the schematic, SCH-7040_B0.pdf for

details on EVB circuit options.

Resistance Error Correction can eliminate the affect of series resistance to provide a more accurate

temperature reading. Ideality Factor Configuration is available to accomodate remote diodes with a

wide range of ideality factors. This is especially important for microprocessors, FPGAs, and graphics

chips.

The EVB-EMC1043, EVB-EMC1053 and EVB-EMC1063 are USB-based platforms for evaluating the

EMC1043/1053/1063 ICs. A block diagram of the EVB is shown in Figure 1.1 below.

Table 1.1 Application Info for Support Temperature Sensors

Temp Sensor Target Application

EMC1043 Designed for CPUs and GPUs which use a substrate PNP transistor for temperature sensing.

65 and 90nm process geometries are supported. The EMC1043’s default configuration enables

Beta Compensation and Resistance Error Correction (R.E.C.) on both external diodes. The

EMC1043-5 version defaults to Beta Compensation disabled. on external diode 2.

EMC1053 The same as EMC1043 except that Beta Compensation is disabled on both diode channels by

default. R.E.C. is enabled on both channels at power-up.

EMC1063 An ideal solution for AMD CPU thermal diodes, the EMC1063 may also be used with 2N3904

diode-connected transistors. The EMC1063 does not have Beta Compensation or REC features

on external diode channel 1. REC is optional for external diode 2.

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EVB-EMC1043/1053/1063 User Manual

SMSC EMC1043/1053/1063 Revision 1.1 (12-14-06)

Figure 1.1 EMC1043/1053/1063 EVB Block Diagram

1.1 Related Documents

The CD included with the evaluation board contains the following documents:

nEvaluation Board Checklist

nBill Of Materials

nSchematic

nJumper Settings and Connector List

nDatasheet

nRegister Manager Application

nRegister Manager Readme.txt

nRegister Definition File

USB-

SMBus

Bridge

SMBus

Vdd

USB

Mini-B

EMC1043

EMC1053

EMC1063

SCL

SDA

Vdd

Bridge

Activity

USB

Activity

LED8

LED7

LED6

P6 JP4

DP1

DN1

Remote

Diode1

Remote

Diode2

DP2

DN2

100ohm

JP1

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EVB-EMC1043/1053/1063 User Manual

Revision 1.1 (12-14-06) SMSC EMC1043/1053/1063

2 Getting Started

2.1 System Requirements

To use the EVB you will need:

nA PC running Windows 2000 or XP

nDisplay resolution 800x600 (or larger to view several windows simultaneously)

nAn available USB port

2.1.1 Feature Summary

nWindows Register Manager application allows viewing and changing register values as well as

graphing temperature history

nUSB communication to evaluation board

nResistive Error Correction can be demonstrated

nAn external SMBus master may also be used (circuit modifications required)

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EVB-EMC1043/1053/1063 User Manual

SMSC EMC1043/1053/1063 Revision 1.1 (12-14-06)

2.1.2 Board Layout

2.1.3 Installing the EVB

1. Install the Register Manager (RegMan) application and device driver on a PC by running Setup.exe

from the RegMan distribution CD. A revision history and install/uninstall notes may be found in the

readme.txt file on the disk.

2. Connect the supplied USB cable to an available USB port on the PC. Plug the “mini-B” end of the

USB cable into EVB connector P6. The +3.3V and Bridge ACT LEDs should illuminate. After the

EVB is connected to the PC the “Find New Hardware” wizard will pop up for USB driver installation.

Follow the instructions in the readme.txt file to complete the installation process.

3. Start the EVB Software by selecting the Register Manager application from the SMSC folder from

the Programs Windows Start menu. The EVB will initialize and the Register Manager Help screen

will appear as in Figure 2.2. The USBAct LED should be blinking when the Register Manager is

running.

Note: The Windows Register Manager application allows viewing and changing register values for a

variety of EVBs including the EMC1001, EMC1002, EMC1023, EMC1033 and

EMC1043/1053/1063. The Register Manager software only needs to be installed once to

support all of these EVBs. The list of supported EVBs may be found in the readme.txt file

included on the distribution CD.

The EMC1043/1053/1063 power up with temperature monitoring disabled. The monitor can be started

by selecting “Started” in the combo box on the upper-left of the Register Manager menu bar.

Alternately, you can start the monitor by clearing bit 6 in the Configuration Register, 0x09.

Figure 2.1 EMC1043/1053/1063 Board Outline and Silkscreen

JP4 (not on

silkscreen)

EMC

1043

EMC1043

Bottom Side

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EVB-EMC1043/1053/1063 User Manual

Revision 1.1 (12-14-06) SMSC EMC1043/1053/1063

Figure 2.2 Register Manager Help Screen

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EVB-EMC1043/1053/1063 User Manual

SMSC EMC1043/1053/1063 Revision 1.1 (12-14-06)

3 Circuit Description

3.1 Introduction

The EMC1043/1053/1063 EVB provides the means to demonstrate EMC1043/1053/1063 features and

to view and modify registers. LED Indicators and test points are included to show status information.

3.2 EMC1043/1053/1063

The EMC1043/1053/1063 is a family of SMBus temperature sensors with 1 internal and 2 external

sensors in an 8 pin MSOP package. Communications with the EMC1043/1053/1063 sensors is via the

SMBus.

3.3 USB to SMBus Bridge

The USB to SMBus bridge is based on an 8051 microcontroller with integrated USB and SMBus

interfaces as well as internal flash and RAM. During EVB manufacture, firmware is loaded into the

bridge that provides the interface between the SMBus and the USB driver. Power is sourced to the

MCU from the USB interface.

3.4 Remote Diode with Resistance Error Correction (R.E.C.)

Two diode-connected 2N3904 transistors are mounted on the EVB, labeled Remote1 and Remote2.

The Remote2 diode DP signal path has a series resistor to demonstrate the EMC1043/1053/1063’s

R.E.C. feature. The resistor may be effectively removed from the circuit by installing a jumper on JP1.

See the Jumper Settings and Connection List for details on jumper settings.

3.5 Power Source

This demo board derives +5V power from the USB port. The bridge microcontroller has an internal

voltage regulator that supplies +3.3V to the EMC1043/1053/1063 and other EVB circuits.

3.6 Direct SMBus Connect Option

It is also possible to connect an external SMBus master to the EMC1043/1053/1063 EVB. A few

modifications to the circuit are required:

nCut 3 traces connecting JP4 pins 3-4, 5-6 and 7-8 on the bottom side of the PCB. This will

disconnect the USB bridge from the SMBus. The pullup resistors for the SMBus SDA, and SCL

signals are also disconnected so external pullups will need to be supplied by the SMBus Master.

nInstall P1 or JP4 to provide an SMBus connector. See the Jumper Settings and Connection List

for details.

nOptionally remove zero ohm resistor R31. When removed, the USB to SMBus bridge will not supply

+3.3V to the circuitry so power will need to be provided from an external source. If R31 is left

installed, power will be supplied from the USB connector when connected to a computer or USB

hub.

3.7 Test Points

Test points are provided for:

nGround

n+3.3V power

n+5V_USB power

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EVB-EMC1043/1053/1063 User Manual

Revision 1.1 (12-14-06) SMSC EMC1043/1053/1063

3.8 LED Indicators

LEDs indicate the status of the following signals:

n+3.3V

nUSB Activity - blinking indicates USB traffic

nBridge Activity, when ON indicates the Bridge is functioning

3.9 Other Sensor Features

Other features such as Ideality Factor Configuration, Conversion Rate, Dynamic Averaging, Hottest of

2 Zones and Standby Mode can be controlled with EMC1043/1053/1063 registers. See the datasheet

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EVB-EMC1043/1053/1063 User Manual

SMSC EMC1043/1053/1063 Revision 1.1 (12-14-06)

4 Demo Description

4.1 Register Manager Overview

The Register Manager application (RegMan) initially displays the main Help screen, where detailed

description of the application’s features may be found. The Help screens can be displayed at any time

by selecting Help from the menubar or pressing the ? button on the toolbar. RegMan enables the user

to display temperature readings, set temperature limits and read/write configuration register values.

4.2 Temperature History Graph

To open a Temperature History Graph window, select Plot -> Temperature History Plot from the

menubar. The history plot continuously updates the temperature reported by the temp sensor. There

are several display options, including which temperatures to display (internal, external, external2),

whether limits should be displayed, and if so, for which temp sensor. See a typical Temperature History

Graph in Figure 4.1 below:

4.3 Resistance Error Correction (R.E.C.)

R.E.C. is normally enabled in EMC1043 and EMC1053 and is optionial for external diode 2 on th

EMC1063. This feature may be disabled for demonstration purposes by writing a “0” to bit 0 of

Configuration Register 2 at address 0x04. This operation is illustrated in Figure 4.2.

To show the R.E.C. feature, remove the jumper on JP1 pins 1-2. This will insert a 100 ohm series

resistor into the circuit and cause a temperature reading error of approximately 60oC. Replace the

jumper and the temperature will return to its correct reading. Now enable R.E.C. by writing a “1” to bit

0 of Configuration Register 2 at address 0x04. With R.E.C. enabled, the temperature will not change

when the jumper is removed and re-inserted.

Figure 4.1 EMC1043 Temperature History Graph

EVB-EMC1043/1053/1063 User Manual

Revision 1.1 (12-14-06) SMSC EMC1043/1053/1063

Note: The temperature reported by the EMC1043 may increase by 2-3oC when disabled due to the

production trim method. The EMC1053 and EMC1063 do not exhibit this behavior.

4.4 Ideality Factor Correction

The Ideality Factor can be adjusted in Ideality Factor Registers 0x27 and 0x28. These registers will

normally hold the default value which is correct for the diodes installed on the EVB. Increasing or

decreasing the value will cause a corresponding change in the temperature reading.

Figure 4.2 Configuration Register Write to Disable R.E.C.

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