Page 1
EVB-EMC1002/EMC1033 User Manual
The information contained herein is proprietary to SMSC, and shall be used solely in accordance with the agreement pursuant to which it is provided. Although the informa tio n i s beli eved to be accurat e, no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to this document and to specifications and product descriptions at any
time without notice. Neither the provision of this information nor the sale of the described semiconductor devices conveys
any licenses under any patent rights or other intellectual propert y right s of SMSC or others unless specifi cally specified oth erwise. The product may contain design defects or errors known as anomalies, including but not necessarily limited to any
which may be identified in this document, which may cause the product to deviate from published specifications. SMSC
products are not designed, intended, authorized or warranted for use in any life support or other application where product
failure could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written
approval of an officer of SMSC will be fully at the risk of the customer. SMSC is a registered trademark of Standard Microsystems Corporation (“SMSC”).
SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL
IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST
INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE OF DEALING OR
USAGE OF TRADE. IN NO EVE NT SHALL SMSC BE LI ABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL,
PUNITIVE, OR CONSEQUENTIAL DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY
KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT; TORT; NEGLIGENCE OF
SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
SMSC EMC1002/EMC1033 Revision 1.1 (12-14-06)
Page 2
1 Overview
The EMC1002 is an SMBus temperature sensing IC with 1 internal and 1 external se nsor in an 8 pin
MSOP package. The EMC1002 has 2 Alert/Therm2 and Addr/Therm outputs that can be configured to
signal when temperatures exceed programmed limits. Resistance Error Correction can eliminate the
affect of series resistance to provide a more accurate temperature reading. This is especially important
for microprocessors, FPGAs, and graphics chips. The EMC1033 is also supported by this evaluation
board (EVB). The EMC1033 has an additional feature, “Anti-Parallel Diode” (APD) support which
allows the connection of two diodes to the EMC1033’s DP/DN inputs in opposite polar ity.
The EVB-EMC1002 and EVB-EMC1033 are USB-based platforms for evaluating the EMC1002/1033.
A block diagram of the EVB is shown in Figure 1.1 below.
LED7
LED6
LED8
P1
SMBus
P6
USB
Mini-B
USB
Activity
Bridge
Activity
USB-
SMBus
Bridge
Vdd
LED1
LED2
JP4
Vdd
SCL
SDA
Alert / Therm2
Addr / Therm
EVB-EMC1002/EMC1033 User Manual
DP
DN
100ohm
EMC1002 /
EMC1033
EMC1033 only
JP1
Fan
Drive
Remote
Diode1
Q2
Q3
Remote
Diode2
P2
Fan
Figure 1.1 EMC1002 / EMC1033 EVB Block Diagram
1.1 Related Documents
The CD included with the evaluation board contains the following documen ts:
n Evaluation Board Checklist
n Bill Of Materials
n Schematic
n Jumper Settings and Connector List
n EMC1002 or EMC1033 Datasheet
n Register Manager Application
n Register Manager Readme.txt
n EMC1002.ini and EMC1033.ini Register Definition File s
Revision 1.1 (12-14-06)
SMSC EMC1002/EMC1033
2
Page 3
EVB-EMC1002/EMC1033 User Manual
2 Getting Started
2.1 System Requirements
To use the EVB you will need:
n A PC running Windows 2000 or XP
n Display resolution 800x600 (or larger to view several windows simultaneously)
n An available USB port
2.1.1 Feature Summary
n Windows Register Manager application allows viewing and changing re gister values as well as
graphing temperature history
n USB communication to evaluation board
n Resistive Error Correction can be demonstrated
n LEDs for Alert/Therm2 and Addr/Therm indication as well as USB bridge activity
n Low cost fan control driven by Alert/Therm2 and Addr/Therm outputs
n An external SMBus master may also be used (circuit modifications required)
2.1.2 Board Layout
USB
P6
Figure 2.1 EMC1002 Board Outline and Silkscreen
2.1.3 Installing the EVB
1. Install the RegMan application and device driver on a PC by running Setup.exe from th e RegMan
distribution CD. A revision history and install/uninstall notes may be foun d 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, Bridge ACT,
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.
EMC
1002
EMC1002
Alert/Therm2 and Addr/Therm LEDs
P2
SMSC EMC1002/EMC1033
Revision 1.1 (12-14-06)
3
Page 4
EVB-EMC1002/EMC1033 User Manual
Note: The Windows Register Manager application allows viewing and changing register values for a
variety of EVBs including the EMC1001, EMC1002, EMC1023 and 1033. 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 o n the distribution CD.
..
Figure 2.2 Register Manager Help Screen
Revision 1.1 (12-14-06)
SMSC EMC1002/EMC1033
4
Page 5
EVB-EMC1002/EMC1033 User Manual
3 Circuit Description
3.1 Introduction
The EMC1002 EVB provides the means to demonstrate EMC1002/1033 features and to view and
modify registers. LED Indicators and test points are included to show status information and a fan
driver circuit linearly drives a 5V fan to 3 different speeds based on programmable temperature limits.
3.2 EMC1002/1033
The EMC1002 is an SMBus temperature sensor with 1 internal and 1 external sensor in an 8 pin
MSOP package. The EMC1033 has the same features plus support for a second external sensor in
parallel with Remote 1 using the “Anti-Parallel Diode” (APD) function. Communications with the
EMC1002/1033 is via the SMBus.
when temperatures exceed programmed limits.
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.
Alert/Therm2 and Addr/Therm outputs may be configured to assert
3.4 Remote Diode with Resistance Error Correction (R.E.C.)
Two diode-connected 2N3904 transistors may be mounted on the EVB, Remote1 and Remote2.
Remote2 is only populated for the EMC1033 EVB and may be disabled by removing jumpers on JP1.
The Remote1 diode DN signal path has a series resistor to demonstrate the EMC1002/1033’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 EMC1002/1033 and other EVB circuits.
3.6 Fan Drive Circuit
The fan drive circuit linearly drives a 5V, 2-wire fan. Three different drive voltages are possible with
the resistor values used on this EVB, 0, 2.4 and 4.1V. If R6 is populated with an 820 ohm resistor, the
fan drive voltages will be approximately 2.4, 3.2. and 4.1V. Other fan drive voltage combinations can
be achieved by varying R3, R4 and R6. R3 and R4 are located on the top side of the PCB next to
transistor Q1. R6 is on the bottom side of the PCB directly opposite Q1.
Note: Full fan ON cannot be achieved with this circuit due to transistor voltage drop.
The fan drive voltage is set by controlling Q1’s base and emitter voltages. When neither the
Alert/Therm2 or Addr/Therm outputs are asserted low, no current flows through Q1’s base terminal so
the base and emitter voltages are high and the fan will be OFF. When the
asserted low, the base voltage is set by the resistor divider R3/R4. When the
asserted low, the transistor is turned ON fully, resulting in the maximum fan drive voltage for this circuit,
which is approximately 4.1V.
Alert/Therm2 output is
Addr/Therm output is
3.7 System Interrupts / LEDs
The Alert/Therm2 and Therm outputs each have a dual-color LED to indicate the Normal (green) and
Alert (red) status The
RegMan application.
SMSC EMC1002/EMC1033
Alert/Therm2 line is also routed to the USB bridge to provide Alert status to the
Revision 1.1 (12-14-06)
5
Page 6
3.8 Direct SMBus Connect Option
It is also possible to connect an external SMBus master to the EMC1002 EVB. A few modifications to
the circuit are required:
n Cut 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 resistor s for the SMBus SDA, SCL and
Alert/Therm2 signals are also disconnected so external pullups will need to be supplie d by the
SMBus Master.
n Install P1 or JP4 to provide an SMBus connector. See the Jumper Settings and Connection List
for details.
n Optionally 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 conne ctor when connected to a computer or USB
hub.
3.9 Test Points
Test points are provided for:
n Alert/Therm2 output, EMC1002/1033 pin 6
n Addr/Therm output, EMC1002/1033 pin 4
n Ground
n +3.3V power
n +5V_USB power
EVB-EMC1002/EMC1033 User Manual
3.10 LED Indicators
LEDs indicate the status of the following signals:
n Alert/Therm2, EMC1002/1033 pin 6
n Addr/Therm, EMC1002/1033 pin 4
n +3.3V
n USB Activity - blinking indicates USB traffic
n Bridge Activity, when ON indicates the Bridge is functioning
Revision 1.1 (12-14-06)
SMSC EMC1002/EMC1033
6
Page 7
EVB-EMC1002/EMC1033 User Manual
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 disp layed at any time
by selecting Help from the menubar or pressing the ? button on the too lbar. 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 for
EMC1033 only), whether limits should be displayed, and if so, for which temp sensor. See a typical
Temperature History Graph in Figure 4.1 below:
..
Figure 4.1 Temperature History Plot
4.3 Temperature Limits and Alert/Therm2, Addr/Therm Outputs
The high and low limits are displayed a s dashed lines, initially w ith values set in the EMC1002.ini file.
(or EMC1033.ini) These limits may be changed either in the register manager or by dragging the li ne
on the history plot. If any of the Temp High or Temp Low Limits are exceeded, the
will assert. If the Ext THERM Limit or the Local THERM Limit are exceeded, the
be asserted.
The
Alert/Therm2 and Addr/Therm outputs are asserted active Low when a temperature exceeds the
programmed limits. The state of these outputs can be monitored by the associated bi-color LEDs or
test points on the PCB.
The Alert/Therm2 output pin can be configured to function as either an SMBus Alert output or as a
Therm2 output. When configured as an SMBus Alert pin it will follow the SMBus Alert Response protocol
to clear the assert state. When configured as a
Response Protocol to clear the pin’s status. This pin is initialized as a
EMC1002/1033.ini file. Change register 0x09 bi t #5 to “0” to configure the pin function to
SMSC EMC1002/EMC1033
Therm2 output it will not require the SMBus Alert
Revision 1.1 (12-14-06)
7
Addr/Therm output will
Therm2 output by the
Alert/Therm2 output
Alert mode.
Page 8
Note: Asserting the Addr/Therm output low will also turn on the ARA LED on this EVB. This is because
the fan driver circuit will pull down the Alert/Therm2 output when Addr/Therm is low. The SMBus
ARA Protocol will not function in this case.
4.4 Fan Driver
The fan driver utilizes the Alert/Therm2 and Addr/Therm outputs to drive a +5V fan to 3 different fan
speeds. See the Circuit Description above for information about th e fan driver. Normally, the fan driver
is OFF. To turn the fan ON at low speed, the
caused by dragging the High Temp Limit line below the current temperature on the Zone Temperature
History graph, using the Register Manager to set the High Temp Limit value lower than the current
temperature or heating the temp sensor to exceed th e limit.
EVB-EMC1002/EMC1033 User Manual
Alert/Therm2 output must be asserted low. This can be
To turn the fan ON to high speed, the
the current temperature exceeds the associated THERM limit.
Note: When
Alert/Therm2 is configured as a Therm2 output, temperatures excee ding the High Temp
Limit will cause it to assert, however the Low Temp Limit is ignored.
Addr/Therm output must be asserted low. This will occur when
4.5 SMBus Alert Protocol (ARA) Support
When the Alert/Therm2 output is asserted an SMBus Alert interrupt is generated and an indicator l ight
will turn RED on the Register Manager panel. Press the Response button to cause RegMan to send
the SMBus Alert Address to the EMC1002/1033. The EMC1002/1033 will respond with it’s SMBus
address which is displayed in a text box next to the Re sponse button on the RegMan interface. If the
temperature is still above the limit, the indicator will remain lit and the
asserted. If the temperature is below the limit the indicator will tu rn OFF and the
will de-assert.
4.6 Resistance Error Correction (R.E.C.)
R.E.C. is normally enabled in the EMC1002/1033, however, for demonstration purposes this evaluation
board uses a special test mode to disable R.E.C. To show the R.E.C. feature, remove the jumper on
JP1 pins 1-2. This will insert a 100 ohm series resi sto r into the circuit an d cause a temperature readi ng
error of approximately 60
Now enable R.E.C. by entering the value 0x0c into R.E.C. configuration register 0x53. With R.E.C.
enabled, the temperature will not change when the ju mper is removed.
o
C. Replace the jumper and the temperature will return to its correct reading.
4.7 Ideality Factor Correction
Alert/Therm2 output will stay
Alert/Therm2 output
The Ideality Factor can be adjusted in Ideality Facto r Registers 0 x27 and 0 x28 (EMC1033 o nly). 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.
4.8 Anti-Parallel Diode (EMC1033 only)
The EMC1033 supports an Anti-Parallel Diode (APD) configuration, where 2 diod es share the same
DP and DN lines but are in opposite polarity to each other. The Remote2 diode can be disconnected
from the circuit by removing one or both jumpers on JP1 pins 3-4 and 5-6. The APD function is
normally enabled on device power-up; the function can be disabled by writing a “1” to Configuration
Register 0x09, bit 0.
Revision 1.1 (12-14-06)
SMSC EMC1002/EMC1033
8
Loading...