Features. General Description. EV Kit Contents. EV Kit Photo

Transcription

1 MAX79 Evaluation Kit Evaluates: MAX79 General Description The MAX79 evaluation kit (EV kit) provides the hardware and software graphical user interface (GUI) necessary to evaluate the MAX79 6-channel PWM-output fan RPM controller. The EV kit includes a MAX79ATI+ installed, as well as a USB-to-IC interface. The USB-to-IC master section on the EV kit labeled MAXIM DS9U HID can be used to interact with the EV kit software and exercise the device s functionality. The EV kit provides headers and test points to connect user-supplied fans, but does not come with a fan included. EV Kit Contents Assembled circuit board including the MAX79ATI+ and USB-to-IC circuitry Mini-USB cable Features Easy Evaluation of the MAX79 USB HID interface Windows XP -, Windows Vista -, and Windows 7-Compatible Software RoHS Compliant Proven PCB Layout Fully Assembled and Tested Ordering Information appears at end of data sheet. EV Kit Photo Windows, Windows XP, and Windows Vista are registered trademarks and registered service marks of Microsoft Corporation ; Rev ; /

2 MAX79 Evaluation Kit Evaluates: MAX79 Component List DESIGNATION QTY DESCRIPTION B B B C CI, C6I, C7I, CI, CI 5 CI, C5I C CI, C9I, CI, CI C CI, C8I C8, C9 CI DI DI DI D7, D8 Green banana jack Deltron 57-5 Black banana jack Deltron 57- Yellow banana jack Deltron 57-7.µF ±%,V X7R ceramic capacitor (85) TDK CGAJX7RAK.µF ±%, 5V X7R ceramic capacitors (6) TDK C68X7REK.7µF ±%, 6.V X5R ceramic capacitors (6) TDK C68X5RJ75K.7µF ±%, 5V X5R ceramic capacitor (85) TDK CGAJX5RH75K.µF ±%, 6V X7R ceramic capacitors (6) Murata GRM88R7C5K 6.8µF ±%, 5V tantalum capacitor (8) Vishay 595D685X5CT.µF ±%, 5V ceramic capacitors (6) Murata GRM88R7HK pf ±5%, V ceramic capacitors (85) AVX 85AJATA nf ±%, V X7R ceramic capacitor (6) TDK C68X7RAK Red LED (6) Knightbright APTR6EC Dual LED (85) Kingbright APHBMSURKCGKC Schottky diode (MINI-F) Panasonic-SSG DBW9L Red LEDs (6) Knightbright APTR6EC DESIGNATION QTY DESCRIPTION J, J, J, J, J, J5, J6 7 JI J J, J7, J8 5 -pin headers,.5mm pitch M 96-6-AR USB_ 5-pin female header Molex pin headers,.5mm pitch M 96-6-AR JI, JI Solder bridges J5, J6 J J, J, J, J, J5, J6, J7, J8, J9, J, J, J QI R R, R, R, R, R, R, R, R, R, R5, R5, R6, R6 6 RI, R7I, R8I RI, RI RI R5, R6 R5I, R6I 8-pin ( x ) headers,.5mm pitch M AR 5-pin BNC TE connector AMP pin headers,.5mm pitch M 96-6-AR nmos (SOT) ON Semi NTSNTG.7kΩ ±% resistors (85) Vishay CRCW85K7FKEA Ω ±% resistors (6) Vishay CRCW6RFKEA.9Ω ±% resistors (6) Vishay CRCW6R9FKEA kω ±% resistor (6) Vishay CRCW6KFKEA.kΩ ±% resistors (85) Vishay CRCW85KFKEA kω ±% resistors (6) Vishay CRCW6KFKEA Maxim Integrated

3 MAX79 Evaluation Kit Evaluates: MAX79 Component List (continued) DESIGNATION QTY DESCRIPTION R7 R, R, R, R, R, R5, R6 MAX79 EV Kit Files Note: The.EXE file is downloaded as a.zip file. Quick Start R9I RI R TP TP5, TP TP8, TP TP57 TP6 TP8, TP TP5 Required Equipment MAX79 EV kit User-supplied Windows XP, Windows Vista, or Windows 7 PC with USB port Mini-USB cable (included) EV kit hardware (included) User-supplied.V power supply (ma minimum) User-supplied V VFAN power supply User-supplied DC fan 9 TP9 TP7 FILE MAX79EVKitSoftware.EXE Ω ±% resistors (85) Vishay CRCW85RFKEA.kΩ ±% resistor (6) Vishay CRCW6KFKEA.7kΩ ±% resistor (6) Vishay CRCW6K7FKEA Ω ±% resistor (85) Vishay CRCW85RFKEA White test points Keystone 5 Black test points Keystone 5 Red test point Keystone 5 Yellow test point Keystone 5 DESCRIPTION Application program Note: In the following sections, software-related items are identified by bolding. Text in bold refers to items directly from the EV kit software. Text in bold and under lined refers to items from the Windows operating system. DESIGNATION QTY DESCRIPTION U Fan controller (8 TQFN-EP*) Maxim MAX79ATI+ UI Current-limit switch (5 SOT7) Maxim MAX787EXK+ UI Linear regulator (5 SOT) Maxim MAX8868EUK+ UI USB transceiver (6 TSSOP) Maxim MAXEEUE+ UI FXMA8 Fairchild FXMA8BQX U5I PIC Microchip PIC8LF55-I/SO X pf crystal Epson C-SH.768KA-A XI -pin CMOS oscillator AVX KC5A8.CE *EP = Exposed pad. PCB: MAX79 6 FAN CONTROLLER, FAN MONITOR Setup Procedure The EV kit is fully assembled and tested. Follow the steps below to verify board operation: ) Place the EV kit hardware on a nonconductive surface to ensure that nothing on the PCB gets shorted to the workspace. ) Ensure that jumper/shunt J is installed, which provides power to the device. ) Check the following startup configuration jumpers/ shunts, which result in the associated behavior: a. J8 (PWM_START) = and J7 (PWM_ START) =. Defines a power-on-reset (POR) PWM duty cycle of 75%. b. J (FREQ_START) =. Defines a POR PWM frequency of 5kHz. c. J (SPIN_START) =. Defines the POR spinup behavior for % duty cycle until two tachometer pulses or s (MAX). d. J (WATCHDOG_START) =. Defines a disabled IC watchdog on POR. e. J5 (ADD) = and J6 (ADD) =. Defines a POR slave address of h. Maxim Integrated

4 MAX79 Evaluation Kit Evaluates: MAX79 ) Ensure that jumpers/shunts J, J, J, J, J5, and J6 are installed, which connects the associated PWMOUT signal to the Fan Fan6 headers. 5) Connect a.v power supply to the and banana jacks. 6) Connect a V power supply to the VFAN and banana jacks. 7) Prior to starting the GUI, connect the EV kit hardware to a PC using the supplied mini-usb cable, or equivalent. The COM LED (Dl) should be red and slowly flash orange. 8) Windows should automatically begin installing the necessary device driver. The USB interface of the EV kit hardware is configured as an HID device and therefore does not require a unique/custom device driver. Once the driver installation is complete, a Windows message appears near the System Icon menu indicating that the hardware is ready to use. Do not attempt to run the GUI prior to this message. If you do, then you must close the application and restart it once the driver installation is complete. On some versions of Windows, administrator privileges may be required to install the USB device. 9) Once the device driver installation is complete, visit /evkitsoftware to download the latest version of the EV kit software, MAX79EVKitSoftware.zip. Save the EV kit software to a temporary folder. ) Open the.zip file and extract the.exe file to your desired location. The.EXE file is the actual EV kit GUI and not an install program. You can store the.exe wherever you like and then uninstall it later by simply deleting the.exe file. ) Double-click on the.exe file to run the GUI. A message box stating The publisher could not be verified. Are you sure you want to run this software? may appear. If so, click Run. ) When the GUI appears, proper communication to the USB-to-IC master is indicated in the lower right corner below the Status box by a text string stating DS9 Connected. The COM LED (Dl) now turns off and flashes red when communication occurs. ) To verify communication to the device, with the default jumper/shunt settings described in steps, press the UpdateDashBoard button on the top right corner and verify the PWM Frequency updates to 5kHz and all Duty Cycle values update to 75.5%, as shown in Figure. This completes the EV kit setup. The hardware and software are ready to begin evaluating the device. If any issues arise, see the Troubleshooting section. Detailed Description of Software GUI Status Box On the bottom right side of the GUI is the Status group box. It is used to relay information to the user and is cleared with the associated Clear Button. The text box below the Status label indicates the status of the communication between the GUI and the EV kit hardware. If everything is working properly, a message indicates DS9 Connected; otherwise, the display shows a yield sign and DS9 Disconnected!! Device Configuration Upon successful completion of the setup procedure, the user is ready to begin evaluation of the device. The device s POR behavior is set by the power-up configuration pins and the default POR values, as defined in the MAX79 IC data sheet. The USB-to-IC master communicates to the Slave ID (hex) shown in the DashBoard in the upper right side of the GUI. To change the target slave address, enter the new value into the input field and press the Set button. Maxim Integrated

5 MAX79 Evaluation Kit Evaluates: MAX79 Figure. MAX79 EV Kit GUI (Main Tab) Maxim Integrated 5

6 MAX79 Evaluation Kit Evaluates: MAX79 Figure. MAX79 EV Kit GUI (FanChannel Tab) Maxim Integrated 6

7 MAX79 Evaluation Kit Evaluates: MAX79 Figure. MAX79 EV Kit GUI (Fan Faults Tab) Maxim Integrated 7

8 MAX79 Evaluation Kit Evaluates: MAX79 Reads Each register of the device can be read from the GUI by the simple press of the associated Read button. The registers are located in one of the tabs as defined below: Main Tab (Figure ): Global Configuration register PWM Frequency register FanChannel 6 Tabs (Figure ): Fan n Configuration register (where n denotes the channel) Fan n Dynamics register Tach n Count register PWMOUT n Duty Cycle register PWMOUT n Target Duty Cycle register TACH n Target Duty Cycle register Window n Register Fan Faults Tab (Figure ): Fan Fault Status register Fan Fault Status register Fan Fault Mask register Fan Fault Mask register Failed Fan Options/Sequential Start register Pressing a Read button performs a single read of the register(s) and updates the associated data fields. There is also an option to do continuous reads of the device. This AutoRead feature is located in the upper right section of the GUI. To start polling at a Hz frequency, press the Start AutoRead button. Each poll reads all registers shown in the dashboard and the active tab then updates the associated data fields. Once the continuous reads start, the button text changes to Stop AutoRead for the user to stop the reads. It is not recommended to change register parameters through a write while AutoRead is enabled. The GUI provides a very simple way to dump all the device registers to a text (.TXT) file. Under the Main Tab sheet, press the Register Dump button and provide a folder and file name. An example of a Register Dump is shown in Figure. Figure. MAX79 Data Table Maxim Integrated 8

9 MAX79 Evaluation Kit Evaluates: MAX79 Writes Each register of the device can be written to/from the GUI either by the simple click on the radio button or the input of a decimal value followed by a press of the associated Write button. The writable registers are located in one of the tabs, as defined in the previous Reads section. Clicking on any radio button or drop-down list automatically writes the selected value to the device. To verify a successful write, perform a read that then updates the field. To write a register that requires a numerical value, such as TACH n Target Count or PWMOUT n Target Duty, enter the decimal value desired for the nonreserved data bits of the registers. For example, to write PWMOUT Target Duty Cycle to a value of 9%, or decimal (refer to the MAX79 IC data sheet for bit weighting), click on the FanChannel tab and enter in the input box located to the left of the PWMOUT Target Duty Cycle(-h) label and press the Write (-h) button. This writes 6h to register h and h to register h. Verify the write by pressing the Read PWM Register button. The GUI provides a very simple way to load all the device registers from a text (.TXT) file. Under the Main Tab sheet, press the Register Load button and provide a previously saved Register Dump file or a modified version of a previous dump. The register load file must have the same format as the GUI-generated dump file. General IC Tab The GUI provides a generic IC tab (ICMemory), which is not required to evaluate the device. Use this tab if a more flexible IC transaction is required. FULL_SPEED Input Signal Control The GUI provides a method to control the FULL_SPEED input to the device. On the right side of the GUI in the DashBoard group box, there is a FULL_SPEED# section with two radio buttons that toggles the logic level of this signal between high and low. FAN_FAIL Output Signal Monitor The GUI provides a method to monitor the FAN_FAIL output of the device. In the DashBoard group box, there is a FAN_FAIL# Pin section that changes to reflect the logic level of this signal. Detailed Description of Hardware User-Supplied Fans The MAX79 EV kit provides the flexibility to control the speeds of up to six fans or monitor up to fans. The EV kit contains fan headers ( mil spacing) that fans connect to. Refer to the MAX79 IC data sheet for various examples of fan configurations. Connect fans to the correct, VFAN, TACH, and PWM headers. In a closed-loop fan-control configuration on FAN FAN6, the jumper/shunt PWMn/FANn (J, J, J, J, J5, and J6) must be populated. This connects the PWM signal from the device to the fan header. To use PWM outputs as tachometer inputs, open-loop monitor configuration, on fan channel for example, remove the jumper/shunt on PWM/Fan (J) and attach a fan to the Fan/Fan7 headers. Connect the desired PWM signal for Fan to the PWM header and connect the desired PWM signal for Fan7 to the PWM7 test point. Properly configure the device through the IC port to reflect the hardware configuration. User-Supplied IC interface The USB-to-IC master section of the EV kit is not necessary for the proper operation of the device. If the user wants to supply the IC interface, the USB-to- IC master section of the EV kit can be disconnected by removing resistors R7 and R8. Connect test points SDA, SCL, and. The FULL_SPEED and FAN_FAIL signals from the device can also be routed to a different master by removing resistors R9 and R and connecting to the FULL_SPD, FAN_FAIL, and test points. Change Startup Configuration Jumpers All the startup configuration jumpers (J J8) are located on the left side of the PCB and partitioned off by silkscreen labeled STARTUP CONFIGURATION. Refer to the MAX79 IC data sheet for resulting device operation. After changing jumper configurations, a device POR or a setting of the Reset bit in the Global Configuration register is required for new configurations to take effect. Maxim Integrated 9

10 MAX79 Evaluation Kit Evaluates: MAX79 Table. Hardware Configurations HARDWARE ACTION COMPONENTS DESCRIPTION Connect user-supplied Fan Fan6 Connect user-supplied Fan7 Fan J, J, J, J, J5, J6, J7, J8, J9, J, J, J Connect a user-supplied fan to the correct, VFAN, TACH, and PWM headers. Connect a user-supplied fan to the correct, VFAN, TACH, and PWM headers. Connect FULL_SPEED and FAN_FAIL pins to user-supplied interface Connect user-supplied I C interface Change startup configuration jumpers R9, R R7, R8 J J8 Remove resistors R9 and R and connect to the FULL_SPD and FAN_FAIL test points. Remove resistors R7 and R8 and connect to user-supplied I C interface to test points. Adjust the jumper/shunt positions according to the silkscreen labels. Table. Description of LEDs LED COLOR DESCRIPTION Dl (FAULT) Red Red USB Power Fault: A fault occurred due to overvoltage limit, current limit, or thermal limit. Communication: After the software has initialized the hardware, the LED flashes red when a command from the PC is received. Dl (COM) D6 D7 Off Red and Flashing Orange Red Red Initialized: Hardware has been initialized by software. Waiting: Hardware is powered on and waiting for the software to be opened. FULL_SPEED: LED connected to the active-low FULL_SPEED input. LED turns red when the FULL_SPEED signal is logic-low. FAN_FAIL: LED connected to the active-low open-drain FAN_FAIL output. LED turns red when the FAN_FAIL signal is logic-low. Maxim Integrated

11 MAX79 Evaluation Kit Evaluates: MAX79 Troubleshooting All efforts were made to ensure that each EV kit works on the first try, right out-of-the-box. In the rare occasion that a problem is suspected, see Table to help troubleshoot the issue. Table. Troubleshooting SYMPTOM CHECK SOLUTION Is the LED labeled Dl red? If yes, then the electronic fuse is in a fault state. Inspect for electrical shorts on the PCB and make sure that the PCB is not sitting on a conductive surface. GUI indicates: Hardware not found GUI Status indicates: Error communicating with the MAX79 Does the LED labeled Dl turn off when the GUI is running? Are any of the LEDs illuminated? Slave address jumper configuration (J5, J6) If not, then exit the GUI and try running it again. If Dl still does not turn off, then exit the GUI and power cycle the board by removing and reapplying the user-supplied power source. Try connecting the USB cable to a different USB port on the PC and wait for a Windows message that states that the hardware is ready to use. Run the GUI again. If Dl still does not turn off, unplug the USB cable and reboot the PC. Connect the USB cable and open the GUI. If not, then the PCB may not be getting power from the usersupplied power supply. Verify the power-supply bias with a voltmeter, measuring from to. Valid levels are V to 5.5V. Check the current setting of the slave address jumper configurations (J5, J6) and input the resulting slave address in the Slave ID (Hex) input box, then pressing the Set button. Maxim Integrated

12 MAX79 Evaluation Kit Evaluates: MAX79 VFAN R.7k R.7k R.7k D7 FanFail R.7k R5.k D8 FullSpeed R6.k B TP FRQ_STRT J FREQ_START TP 5 ADD TP ADD HDR_8P IN HDR_8P IN SPIN_START TP J SPIN_START TP6 PWM_STRT TP5 J7 J8 PWM_START PWM_START J WD_START B =.V W D_STRT SPN_STRT C.uF C J JUMP ER FAN_F AIL# FULL_SPD# TP TP 7 SDA SCL PWM_STRT TP TP TP.7uF 5VOLT.7uF 5VOLT X CRYSTAL pf MIL TRACE + SDA SCL TP 9 PWMOUT TACH PWMOUT5 TACH5 PWMOUT6 TACH6 DUT TP 5 TP TP TP TP 8 TP 6 TP TP TP 7 B C C TP 7 FREQ_START SPIN_START ADD A DD WD_START VDUT PWMOUT TACH PWMOUT TACH PWMOUT T A CH RedLEDs CL KOUT J TP 8 R CL KOUT SL AVE ADDR= h - 5Eh C8 pf C9 pf FREQ_START R T SPIN_ST ART ADD ADD WD_START T XTAL XTAL C PW M OUT TACH PWMOUT TACH PWMOUT TACH R7 SDA SDA PWMOUT R8 SCL SCL TACH FAN_F AIL# FAN_F AIL PWMOUT5 PWM_START 5 PWM_START TAHC5 PWM_START 6 PWM_START PWMOUT6 FULL_SPEED# 7 FULLSPEED L TACH6 R9 CL KOUT 8 CL KOUT K R U MAX79 CLKOUT FULL_SPEED# PWM_START PWM_START FAN_FAIL# SCL SDA FREQ_START SPIN_START ADD ADD WD_START J9A J9C VDUT (8 PIN ROUND DB) PWMOUT 9 TACH 8 PWMOUT 7 TACH 6 PWMOUT 5 TACH J9B 8 PI N ROUND DB PWMOUT TACH PWMOUT5 TACH5 PWMOUT6 TACH6 This is the through hole footprint for M the placement S on PC FAN_FAIL# FULL_SPEED# MAX79 Circuitry SDA_P IC SCL _PIC P7 P6 J9D 8 PI N ROUND DB FREQ_START PWM_START PWM_START WD_START CONFIGURE POWER UP SAMPLED PIN FRQ_STRT: = Hz UNCONNECTED =.7 khz = 5kHz 8 PI N ROUND DB SL AVE ADDRESS SEL ECT PINS ADDITIONAL TE ST PO IN TS EV KIT LAYOUT NOTE: Use recom mended PCB layout for crystal traces A DD J5 J6 SDA SDA 5 6 SCL SCL A DD SPIN_STRT: = NO SPIN-UP UNCONNECTED =.5s MAX =.s MAX POR CONDI TION PWM_STRT WM_STRT P DUTY P WM CYCL E (%) UNCONNECTED UNCONNECTED 5 UNCONNECTED 6 WD_STRT: = NO WATCHDOG = s Figure 5a. MAX79 EV Kit Schematic (Sheet of ) Maxim Integrated

13 MAX79 Evaluation Kit Evaluates: MAX79 TP TACH TACH R TP PWMOUT PWMOUT C MIL TRACE R R.7k R.7k C FAN HEADER J J PWM J7 FAN7 HEADER D TP PWM7 TACH7 PWM7 TACH TP TACH R PWMOUT PWMOUT TP C MIL TRACE R R.7k R.7k C FAN HEADER J (5.5V ZENER) J PWM J8 FAN8 HEADER D TP 5 PWM8 TACH8 PWM8 (5.5V ZE NE R ) TP 6 TACH TACH TP 7 PWMOUT PWMOUT R MIL TRACE C R R.7k R.7k C FAN HEADER J J PWM J9 FAN9 HEA DER D TP 8 PWM9 (5.5V ZENER) FAN - AND 7-9 HEADERS TACH9 PWM9 Figure 5b. MAX79 EV Kit Schematic (Sheet of ) Maxim Integrated

14 MAX79 Evaluation Kit Evaluates: MAX79 TP 9 TACH TACH R C PWMOUT PWMOUT TP 5 MIL TRACE R R.7k R.7k C FAN HEADER J J PWM J FAN HEADER D TP 5 PWM TACH PWM TP 5 TACH5 TACH5 R5 C5 PWMOUT5 PWMOUT5 TP 5 MIL TRACE R5 R5.7k R5.7k C5 FAN5 HEADER J5 (5.5V ZENER) J5 PWM5 J FAN HEA DER D5 TACH PWM TP 5 PWM (5.5V ZENER) TP 55 TACH6 TACH6 R6 C6 PWMOUT6 PWMOUT6 TP 56 MIL TRACE R6 R6.7k R6.7k C6 FAN6 HEADER J6 J6 PWM6 J FAN HEADER D6 FAN - 6 AND - HEADERS TP 57 PWM TACH PWM (5.5V ZENER) Figure 5c. MAX79 EV Kit Schematic (Sheet of ) Maxim Integrated

15 MAX79 Evaluation Kit Evaluates: MAX79.V JI RCV V VP O V VMO V OE V VP I V VMI V RI.7k JI Vbus D- D+ I.D. USB_5P IN 5 VBUS RI.9 RI.9 D- D UI RCV USB_DET VP O VL MODE VTRM VMO D+ OE D- SUSP VP I VMI ENUM MAXE USB Transceiver. Converts USB signals to logical signals. The high lev el for the logical signals is.v USB_DET V VTRM D+ D- ENUM V 5V CI.uF C9I.uF.V CI.uF R7I R8I R9I.k DI A DI B DI JI JI VP P COM RCV VDUT P6 CL K VDUT OE VDUT CI U5I MCL R P,HB COM_L ED,BOOT P P RCV P6, CS OSC OSC P UOE PS_VAR VUSB PICfor DS9 P8,W_PU P7,W_DQ P5 USB_DET VP O VMO P,SCK,SCL P,SDI,SDA VDD P9,SDO ENUM D+,VP D-,VM nf USB-to-IC Master RI DI LED UI ON FLAG 5V 5 IN OUT CI CI CI MAX787 MAX787EXK +TCT- ND.7uF.uF.uF ma current limiting switch. XI INH OUT OSC_CMOS_pin 8MHz Oscillator.V C8I.uF P7 USB_DET VDUT VP O VDUT VMO VDUT SCL _PIC SDA_P IC ENUM VDUT VP I VDUT VMI VDUT CI.uF CI.uF UI SHDN IN BP OUT MAX8868EUK -T.V Linear Regulator, 5mA max 5 CI.uF.V C5I.7uF.V C6I C7I.uF.uF ENUM V VMI V VP I V OE V VMO V VP O V RCV V CL K V UI A B A B A B A B A B A B A5 B5 A6 B6 A7 B7 OE FXMA ENUM VDUT VMI VDUT VP I VDUT OE VDUT VMO VDUT VP O VDUT RCV VDUT CL K VDUT 8-Channel, Bi-Directional Level Translator. USB side has a fixed.v reference. PIC side reference is the varying VDUT reference. R5I k USB_DET V R6I k RI k QI NMOS USB_DET VDUT Red Green Figure 5d. MAX79 EV Kit Schematic (Sheet of ) Maxim Integrated 5

16 MAX79 Evaluation Kit Evaluates: MAX79 Figure 6. MAX79 EV Kit PCB Layout Top Maxim Integrated 6

17 MAX79 Evaluation Kit Evaluates: MAX79 Figure 7. MAX79 EV Kit PCB Layout Bottom Maxim Integrated 7

18 MAX79 Evaluation Kit Evaluates: MAX79 Ordering Information PART MAX79EVKIT# TYPE EV Kit #Denotes an RoHS-compliant device that may include lead(pb), which is exempt under the RoHS requirements. Maxim Integrated 8

19 MAX79 Evaluation Kit Evaluates: MAX79 Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED / Initial release For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim Integrated s website at. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. Maxim Integrated Products, Inc. 9