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19-3422; Rev 0; 10/04
MAX6640 Evaluation System/Evaluation Kit
General Description
The MAX6640 evaluation kit (EV kit) is an assembled and tested PC board with a mounted MAX6640. The EV kit allows full evaluation of the MAX6640 dual temperature sensor/fan controller. The MAX6640 monitors its own die temperature and the junction temperature of one external diode-connected transistor or the junction temperatures of two external diode-connected transistors. It converts the temperature to 8-bit or 11-bit 2-wire serial data that can be accessed over a 2-wire serial bus. The MAX6640 EV kit includes both external diode-connected transistors (2N3906) soldered to the board, which can be removed. The board can then be connected through a twisted pair to remote diodes close to your system. The temperature data is also used by the internal dual PWM fan-speed controller to adjust the speed of up to two cooling fans. Speed control is accomplished by tachometer feedback from the fan. The MAX6640 evaluation system consists of a Maxim Command Module (CMOD232) and a MAX6640 EV kit. The CMOD232 board connects to a computer's RS-232 serial port to provide a computer-controlled SMBusTM/ I2CTM bus. Windows(R) 95/98/2000/XP-compatible software provides a user-friendly interface to exercise the features of the MAX6640. The program is menu driven and offers a graphic interface with control buttons and status display. Order the MAX6640EVCMOD2 for a complete PC-based evaluation of the MAX6640. Order the MAX6640EVKIT if you already have a CMOD232 SMBus interface.
Features
Two Thermal-Diode Inputs Local Temperature Sensor Programmable Temperature Alarms Two PWM Outputs for Fan Drive Programmable Fan-Control Characteristics SMBus/I2C Compatible Easy-to-Use Menu-Driven Software Fully Assembled and Tested Includes Windows 95/98/2000/XP-Compatible Software and Demo PC Board
Evaluate: MAX6640
Ordering Information
PART MAX6640EVKIT MAX6640EVCMOD2 TEMP RANGE 0C to +70C 0C to +70C SMBus INTERFACE TYPE Not included CMOD232
Note: The MAX6640 EV kit software is provided with the MAX6640EVKIT. However, the CMOD232 board is required to interface the EV kit to the computer when using the software.
Component List
DESIGNATION QTY DESCRIPTION 0.1F 10%, 16V X7R ceramic capacitor (0603) Murata GRM188R71C104KA01 TDK C1608X7R1C104K 2200pF 10%, 50V X7R ceramic capacitors (0603) Murata GRM188R71H222K TDK C1608X7R1H222K 3-pin headers, 0.1in pitch, vertical, friction lock 2 x 10 right-angle female receptacle Methode Electronics RS2R-20-G SamTec SSW-110-02-S-D-RA Not installed Not installed n-channel MOSFET, 1.4A, 30V, SOT23 Fairchild NDS351AN 2N3906-type pnp transistor, SOT23 Central Semiconductor CMPT3906 Diodes, Inc. MMBT3906 47 5% resistor (0603) 4.7k 5% resistors (0603) 10k 5% resistors (0603) MAX6640AEE (16-pin QSOP)
C1
1
C2, C3
2
MAX6640EVCMOD2 (MAX6640 EV System) Component List
PART MAX6640EVKIT CMOD232 AC adapter QTY 1 1 1 DESCRIPTION MAX6640 evaluation kit SMBus/I2C interface board 9VDC at 200mA (powers the CMOD232 board)
J1, J2 J3 JU1 JU2, JU3, JU4, JU5 N1, N2 Q1, Q2 R1 R2, R4 R3, R5-R11 U1
2 1 0 0 2 2 1 2 8 1
SMBus is a trademark of Intel Corp. I2C is a trademark of Philips Corp. Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. Windows is a registered trademark of Microsoft Corp.
________________________________________________________________ Maxim Integrated Products
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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.
MAX6640 Evaluation System/Evaluation Kit Evaluate: MAX6640
Component Suppliers
SUPPLIER Central Semiconductor Diodes, Inc. Fairchild Semiconductor Murata TDK PHONE 631-435-1110 805-446-4800 888-522-5372 770-436-1300 847-803-6100 FAX 631-435-1824 805-446-4850 -- 770-436-3030 847-390-4405 WEBSITE www.centralsemi.com www.diodes.com www.fairchildsemi.com www.murata.com www.component.tdk.com
Note: Indicate you are using the MAX6640 when contacting these manufacturers.
Quick Start
Recommended Equipment
Before you begin, the following equipment is needed. Do not turn on the power until all connections are made: * Computer running Windows 95, 98, 2000, or XP. * RS-232 serial port (this is a 9-pin socket on the back of the computer). * Standard 9-pin, straight-through, male-to-female cable to connect the computer's serial port to the Maxim CMOD232 board. * 3.3V (recommended) or 5V, 100mA, DC power supply. * Power supply to power the fans. The voltage and current depend on the fans used, but the voltage must not exceed 30V. * Two DC fans with tachometer outputs. Each fan must not draw more than 1.4A continuous.
7) Turn on the power supplies. 8) Start the MAX6640 program by opening its icon in the Start menu. 10) Wait until the program automatically detects the address of the MAX6640 and displays the userinterface panel (Figure 1).
Detailed Description
User-Interface Panel
The user interface is easy to operate; use the mouse, or press the Tab and arrow keys to navigate. The checkboxes, edit fields, and radio buttons correspond to bits in the MAX6640 registers. Clicking on them generates the correct SMBus command and updates the registers. Note: Words in boldface are user-selectable features in the software.
Temperature
The MAX6640 monitors its own die temperature and the junction temperature of one external diode-connected transistor or the junction temperatures of two external diode-connected transistors. The temperature measurements are capable of either 8-bit or 11-bit (extended) resolution; 8-bit resolution results in a temperature resolution of 1C/LSB. Extended resolution results in a temperature resolution of 0.125C/LSB. Enable extended resolution by selecting the Extended Resolution checkbox (Figure 1). Read the temperatures by clicking on the Read Temp buttons (Figure 1). The temperature is shown to the right of the buttons.
Connections and Setup
Carefully connect the boards by aligning the 20-pin connector of the MAX6640 EV kit with the 20-pin header of the CMOD232 board. Gently press them together. 1) Disable the pullup resistors on the CMOD232 board by moving switch SW1 to the OFF position. 2) Connect a cable from the computer's serial port to the CMOD232 board. Use a straight-through, 9-pin, male-to-female cable. 3) Install the software by running the INSTALL.EXE program. The install program copies the files and creates icons for them in the Windows 95/98/ 2000/XP Start menu. (To remove the software at any time, click on the UNINSTALL icon.) 4) Connect the 9V adapter to the CMOD232 board. 5) Connect the +3.3V supply to the pads labeled VIN and GND on the MAX6640 EV kit. 6) Connect the fan power supply to the pads labeled VFAN and FAN_GND. The voltage must not exceed 30V.
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External Diodes
The MAX6640 remote temperature sensor is optimized for use with a diode-connected transistor whose ideality factor is equal to 1.008. Transistors with different ideality factors produce different remote temperature readings. Some typical discrete transistors may produce readings that vary up to 3C from the correct value. Refer to the Maxim website (maxim-ic.com) Application Note: Compensating for Ideality Factor and Series
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MAX6640 Evaluation System/Evaluation Kit Evaluate: MAX6640
Table 1. Global Configuration Register Checkboxes
BIT 7 NAME STOP STATE Checked Unchecked* Checked Unchecked* Checked* 5 SMB Timeout Enabled Channel 2 Source = Local Reserved Reserved Reserved Unchecked Checked* Unchecked NA NA NA NA DESCRIPTION Places the MAX6640 in software standby mode. Places the MAX6640 in operational mode. Resets all registers to their default values including the global configuration register. After selecting the POR checkbox, the checkbox returns to the unchecked state. Normal operation. Enables the SMBus timeout. Disables the SMBus timeout, as well as alert response, thus providing true I2C compatibility. The local sensor on the MAX6640 is the source for channel 2. The remote sensor connected to DXP2 is the source for channel 2. Not used. Not used. Not used. Not used.
6
POR
4 3 2 1
0 Reserved *POR state.
Resistance Differences Between Thermal Sense Diodes for additional information.
Global Configuration
The global configuration register has several functions. Figure 2 shows the checkboxes that configure the register. Each checkbox corresponds to a bit in the register. Table 1 describes the function of each checkbox. Read the global configuration by clicking on the Read button. Change the global configuration by selecting or deselecting the desired functions and clicking on the Write button.
ALERT, THERM, and OT Temperature Limits
The MAX6640 has ALERT, THERM, and over-temperature (OT) limit registers. Temperatures exceeding the ALERT limit register generate an alert interrupt. Exceeding the THERM or OT limits sets the THERM or over-temperature bit in the status register and asserts the THERM or OT output pin. Read the limits by clicking on the Read buttons (Figure 1). The value (in Celsius) is shown to the right of the button. Change the limits by entering the value (in Celsius) into the appropriate edit field and clicking on the Write button.
Mask
The mask register enables or disables the ALERT, OT, THERM, or FANFAIL outputs. Figure 3 shows the checkboxes that configure the register. Each checkbox corresponds to a bit in the register. Table 2 describes the function of each checkbox. Read the mask register by clicking on the Read button. Change the mask by selecting or deselecting the desired masks and clicking on the Write button.
Fan-Start Temperature
The fan-start temperature register contains the temperature at which fan control begins. Note: This applies only to automatic RPM mode. Refer to the MAX6640 data sheet for more information on automatic RPM mode operation. Read the fan-start temperature by clicking on the Read button (Figure 1). The value (in Celsius) is shown to the right of the button. Change the fan-start temperature by entering the value (in Celsius) into the edit field and clicking on the Write button.
Status
The Status box displays the critical and fault conditions that occur. Each line corresponds to a bit in the registers. See Table 3 for a list of the status conditions. Read the status by clicking on the Read Status button.
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Table 2. Mask Register Checkboxes
BIT 7 6 5 4 3 2 1 0 NAME Channel 1 ALERT Mask Channel 2 ALERT Mask Channel 1 OT Mask Channel 2 OT Mask Channel 1 THERM Mask Channel 2 THERM Mask FAN 1 Fault Mask FAN 2 Fault Mask STATE Checked Unchecked* Checked Unchecked* Checked Unchecked* Checked Unchecked* Checked Unchecked* Checked Unchecked* Checked* Unchecked Checked* Unchecked DESCRIPTION Disables the channel 1 ALERT interrupts. Enables the channel 1 ALERT interrupts. Disables the channel 2 ALERT interrupts. Enables the channel 2 ALERT interrupts. Prevents OT from being asserted by a channel 1 fault. Allows OT to be asserted by a channel 1 fault. Prevents OT from being asserted by a channel 2 fault. Allows OT to be asserted by a channel 2 fault. Prevents THERM from being asserted by a channel 1 fault. Allows THERM to be asserted by a channel 1 fault. Prevents THERM from being asserted by a channel 2 fault. Allows THERM to be asserted by a channel 2 fault. Prevents FANFAIL from being asserted by a fan 1 fault. Allows FANFAIL to be asserted by a fan 1 fault. Prevents FANFAIL from being asserted by a fan 2 fault. Allows FANFAIL to be asserted by a fan 2 fault.
*POR state.
Table 3. Status Register
BIT 7 6 5 4 3 2 1 0 NAME Channel 1 ALERT Channel 2 ALERT Channel 1 OT Channel 2 OT Channel 1 THERM Channel 2 THERM Fan 1 Fault Fan 2 Fault DESCRIPTION The temperature of channel 1 is above the value set in the channel 1 ALERT limit register. The temperature of channel 2 is above the value set in the channel 2 ALERT limit register. The temperature of channel 1 has exceeded the value set in the channel 1 OT limit register. This bit returns to zero when the temperature of channel 1 drops 5C below the channel 1 OT limit. The temperature of channel 2 has exceeded the value set in the channel 2 OT limit register. This bit returns to zero when the temperature of channel 2 drops 5C below the channel 2 OT limit. The temperature of channel 1 has exceeded the value set in the channel 1 THERM limit register. This bit returns to zero when the temperature of channel 1 drops 5C below the channel 1 THERM limit. The temperature of channel 2 has exceeded the value set in the channel 2 THERM limit register. This bit returns to zero when the temperature of channel 2 drops 5C below the channel 2 THERM limit. A fault has been detected on fan 1. Refer to the MAX6640 data sheet for a detailed description. A fault has been detected on fan 2. Refer to the MAX6640 data sheet for a detailed description.
Fan 1 and Fan 2 Configuration 1
The configuration 1 box (Figure 4) controls the modes of operation of the fans. This box contains four items: mode, rate of change, control, and RPM range. Mode has two options: PWM mode and RPM mode. Select PWM mode to control the PWM duty cycle manually. RPM mode allows for either manual or automatic control of the fan's RPM.
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Rate of change sets the time between increments of the duty cycle. Each increment is 1/120 of the PWM period. By adjusting the rate of change, audibility of fan-speed changes can be traded for response time. There are eight possible options: 0s, 0.0625s, 0.125s, 0.25s, 0.5s, 1s, 2s, and 4s.
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MAX6640 Evaluation System/Evaluation Kit
Control sets the temperature channels that control the fan in RPM mode. There are four options under the control setting: None, Channel1, Channel2, and Both. Selecting None allows for manual control of the fan's RPM. Selecting Channel1, Channel2, or Both, allows the fan's RPM to be controlled by the temperature of the selected channel(s). RPM range scales the tachometer counter by setting the maximum (full-scale) value of the RPM range. There are four possible selections: 2000, 4000, 8000, and 16000. Select the closest value that is greater than the fan's full-speed RPM. Read the configuration 1 register by clicking on the Read button. Change the configuration by selecting the desired options and clicking on the Write button.
Fan 1 and Fan 2 Configuration 2B
The configuration 2B box (Figure 4) also applies to the automatic RPM mode. This box sets the tachometer step sizes and number of steps for step-size A to stepsize B slope changes. RPM step-size B selects the number of tachometer counts the target value decreases for each temperature-step increase above the fan-start temperature. The value can be set between 1 and 16. Number of steps sets the number of temperature/ tachometer steps above the fan-start temperature at which step-size B begins. Number of steps can be set between 1 and 16. Read the configuration 2B register by clicking on the Read button. Change the configuration by selecting the desired options and clicking on the Write button.
Evaluate: MAX6640
Fan 1 and Fan 2 Configuration 2A
The configuration 2A box (Figure 4) applies to the automatic RPM mode. This box contains four items: RPM step-size A, temp step-size, positive PWM polarity, and min speed. RPM step-size A selects the number of tachometer counts the target value decreases for each temperature-step increase above the fan-start temperature. The value can be set between 1 and 16. Temperature step-size selects the temperature increment for fan control. For each temperature-step increase, the target tachometer count decreases by the value of RPM step-size A. The temperature step-size value can be set to 1C, 2C, 4C, and 8C. Positive PWM polarity sets the PWM output polarity. Selecting Positive PWM polarity results in the PWM output being high at 100% duty cycle. Unselecting Positive PWM polarity results in the PWM output being low at 100% duty cycle. Minimum speed selects the value of the minimum fan speed (when the temperature is below the fan-start temperature in the automatic RPM mode). There are two possible selections: 0% duty cycle and Set by Start TACH. Selecting 0% duty cycle results in the fan being off when the temperature is below the fan-start temperature value. Selecting Set by Start TACH results in the fan operating at the speed set in registers 0x22 or 0x23 (the start or target tachometer count boxes). Read the configuration 2A register by clicking on the Read button. Change the configuration by selecting the desired options and clicking on the Write button.
Fan 1 and Fan 2 Configuration 3
The configuration 3 box (Figure 4) controls fan spin-up, THERM to fan full speed, pulse stretching, and PWM output frequency. The fan spin-up feature ensures that the fan starts. Whenever the fan starts up from zero drive, it is driven with 100% duty cycle for 2s to ensure that it starts. Fan spin-up is enabled by default. To disable the feature, select Fan Spin Up Disable. When THERM to Fan Full Speed is selected, THERM going low (either by being pulled low externally or by the temperature exceeding the THERM limit) forces the fan to full speed. The fan is forced to full speed at the rate determined by the rate of change setting in configuration 1. Pulse stretching is used with a pulse-modulated power supply powering the fan. When modulating the fan's power supply with the PWM signal, the PWM pulses are periodically stretched to keep the tachometer's signal available for one full revolution. Select Pulse Stretching Disable to disable this feature. PWM frequency sets the frequency that drives the pulse-modulated power supply. The frequency can be set to 20Hz, 33.33Hz, 50Hz, or 100Hz. Read the configuration 3 register by clicking on the Read button. Change the configuration by selecting the desired options and clicking on the Write button.
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MAX6640 Evaluation System/Evaluation Kit Evaluate: MAX6640
Fan 1 and Fan 2 Tachometer Count
The tachometer count box is shown in Figure 5. The tachometer count value is inversely proportional to the fans' speed. Read the tachometer count by clicking on the Read button.
Automatic Read
The program polls the device for the new temperature and status data a maximum two times per second (2Hz). To disable the polling of data, deselect Automatic Read on the Action menu.
Data Logging
Select Data Logging on the Action menu to activate data logging. Data logging saves temperature, voltage, and status data to a text file that includes a time/date stamp next to each data point. If automatic read is enabled, data is sampled at 2Hz; however, the data is logged to the file only if the temperature or status has changed. This slows the growth of the data-logging file. When automatic read is disabled, the data is logged each time Read All is selected on the Action menu. To stop data logging, deselect Data Logging on the Action menu.
Fan 1 and Fan 2 Start or Target Tachometer Count
The start or target tachometer count (Figure 5) sets either the starting tachometer count for the fan when operating in automatic RPM mode or the target tachometer count when operating in manual RPM mode. Read the count by clicking on the Read button. Change the count by entering the value into the edit field and clicking on the Write button.
Fan 1 and Fan 2 Pulses per Revolution and Min Tach Count
The Pulses per Revolution and Min Tach Count box (Figure 5) sets the number of tachometer pulses per revolution of the fan and the minimum allowable tachometer count (maximum speed) for the fan. The Tach. Pulses per Rev. setting has four options: 1, 2, 3, or 4. The minimum tachometer count can be set to any value between 0 and 63. Read the pulses per revolution and min tach count by clicking on the Read button. Change the pulses per revolution by selecting the desired number from the list box. Change the min tach count by entering the value into the edit field. Click on the Write button to apply the changes.
Slave Address
The MAX6640 has a fixed address of 0101 111.
Simple SMBus Commands
There are two methods for communicating with the MAX6640: through the normal user-interface panel or through the SMBus commands available by selecting Interface on the Debug menu. A display pops up that allows the SMBus protocols, 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 deselecting Automatic Read on the Action menu. The SMBus 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. Note: In places where the slave address asks for an 8bit value, it must be the 7-bit slave address of the MAX6640 with the last bit set to 1 for a read operation and zero for a write.
Fan 1 and Fan 2 Duty Cycle
The duty cycle box (Figure 6) contains the PWM dutycycle value. When operating in RPM mode, this value is controlled by the MAX6640. In PWM mode, this is the desired (target) PWM duty-cycle value. The value can be set between 0 and 120. Any number above 120 is changed to 120. Read the duty-cycle value by clicking on the Read button. Change the count by entering the value into the edit field and clicking on the Write button.
Jumpers JU2 and JU3
Jumpers JU2 and JU3 connect the 2N3906 transistors as the external diodes. To use different diodes, cut the trace, short the two pins of JU1 and JU2, and connect the diodes (through twisted-pair wire) to the DXP1, DXN, and DXP2 pads.
Alert
The message ALERT appears in the alert box when an interrupt condition occurs, unless the configuration register is set to mask the alert. The cause of the interrupt is shown in the status boxes. To clear the interrupt, first eliminate the condition that caused it and click on Read Alert.
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MAX6640 Evaluation System/Evaluation Kit Evaluate: MAX6640
Figure 1. Main Window for the MAX6640 EV Kit Software
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Figure 2. MAX6640 EV Kit Software Showing the Global Configuration Panel 8 _______________________________________________________________________________________
MAX6640 Evaluation System/Evaluation Kit Evaluate: MAX6640
Figure 3. MAX6640 EV Kit Software Showing the Mask Panel
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Figure 4. MAX6640 EV Kit Software Showing the Fan 1 Configuration Panel 10 ______________________________________________________________________________________
MAX6640 Evaluation System/Evaluation Kit Evaluate: MAX6640
Figure 5. MAX6640 EV Kit Software Showing the Fan 1 Tachometer Panel
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Figure 6. MAX6640 EV Kit Software Showing the Fan 1 Duty-Cycle Panel 12 ______________________________________________________________________________________
MAX6640 Evaluation System/Evaluation Kit Evaluate: MAX6640
20-PIN HEADER J3-1 FAN1(-) 3 VFAN FAN1(+) 3 N1 J1 2 2 1 R2 4.7k VDD PWM1 1 VFAN R3 10k 2 VDD 3 VFAN FAN2(+) 2 J2 3 N2 2 1 R4 4.7k PWM2 3 VFAN R5 10k 4 VIN VFAN VFAN FANFAIL FAN_GND R7 10k 6 VIN R8 10k 7 VIN VIN JU4 R1 47 VDD VCC 8 VCC DXP1 9 OT THERM R6 10k 5 VIN FANFAIL C3 2200pF 1 3 DXN GND 11 10 C2 2200pF 1 2 JU2 DXP1 3 Q1 DXN TACH2 PWM2 ALERT 14 VCC JU1 1 2 3 DXP2 JU3 2 Q2 TACH1 PWM1 U1 SCL 16 VIN R10 10k SDA 15 JU5 VIN R11 10k ALERT J3-19 N.C. VIN R9 10k J3-3 J3-5 SCL J3-7 J3-9 J3-11 SDA J3-13 J3-15 J3-17 N.C. N.C. N.C. N.C. ALERT SCL N.C. SDA J3-2 J3-4 J3-6 J3-8 J3-10 J3-12 J3-14 J3-16 J3-18 J3-20
FAN1(TACH) FAN2(-)
1
MAX6640
FAN2(TACH)
1
VCC DXP2
13 12
THERM
OT
VDD
C1 0.1F
GND
Figure 7. MAX6640 EV Kit Schematic
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Figure 8. MAX6640 EV Kit Component Placement Guide-- Component Side
Figure 9. MAX6640 EV Kit PC Board Layout--Component Side
Figure 10. MAX6640 EV Kit PC Board Layout--Solder 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.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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