MAX6876EVCMOD2

19-3635; Rev 0; 9/05 MAX6876 Evaluation Kit/Evaluation System The MAX6876 evaluation system (EV system) consists of a MAX6876 evaluation kit (EV kit) and a Maxim CMOD232 command module. The MAX6876 EEPROMprogrammable quad power-supply tracker/sequencer circuit monitors four system voltages and ensures proper power-up and power-down conditions for systems requiring voltage tracking and/or sequencing. The evaluation software (EV software) runs under Windows® 98/2000/XP, providing a convenient user interface to exercise the features of the MAX6876. Order the complete EV system (MAX6876EVCMOD2) for a comprehensive evaluation of the MAX6876 using a PC. Order just the EV kit (MAX6876EVKIT) if the command module has already been purchased with a previous Maxim EV system, or if the EV kit is desired for custom development in conjunction with other microcontroller-based systems. 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. Features ♦ Proven PC Board Layout ♦ Complete Evaluation System ♦ Convenient On-Board Test Points and Connectors ♦ Fully Assembled and Tested Ordering Information TEMP RANGE INTERFACE TYPE MAX6876EVKIT PART 0°C to +70°C User supplied MAX6876EVCMOD2 0°C to +70°C Windows software, RS-232 port 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. MAX6876 EV Kit Component List MAX6876 Stand-Alone EV Kit The MAX6876 EV kit provides a proven PC board layout to facilitate evaluation of the MAX6876. It must be interfaced 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. MAX6876 EV System 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 communications port. See the Quick Start section for setup and operating instructions. MAX6876 EV System Component List PART QTY DESCRIPTION MAX6876EVKIT 1 MAX6876 evaluation kit CMOD232 1 Command module MAX6876 EV Kit Software 1 User-interface software Windows is a registered trademark of Microsoft Corp. DESIGNATION QTY DESCRIPTION C1–C4 4 10µF ceramic capacitors KEMET C0805C106K9PACTU C5–C8 0 Not installed Nichicon UUD1H221MNL1GS C9–C12 0 Not installed KEMET C0805C106K9PACTU C13–C16 4 1µF ceramic capacitors KEMET C0805C105K8RACTU CR1–CR6 6 1206 surface-mount LEDs Fairchild Semiconductor QTLP650D4TR J1–J9, J11, J12 11 Banana plug receptacles Keystone Electronics 6095 J10 1 20-pin right-angle header Samtec SSW-110-02-S-D-RA JMP1, JMP2, JMP6 3 3-pin headers, 0.1in centers Samtec TSW-103-07-F-S JMP3, JMP4, JMP5, JMP7 4 2-pin headers, 0.1in centers Samtec TSW-102-07-F-S Q1–Q4 4 20V logic-level n-channel MOSFETs International Rectifier IRLR3714Z ______________________________________________________________________________________ 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. 1 Evaluate: MAX6876 General Description Evaluate: MAX6876 MAX6876 Evaluation Kit/Evaluation System Component List (continued) DESIGNATION QTY DESCRIPTION R1 0 Surface-mount resistor (0805) (not installed) R2 0 Surface-mount resistor (0805) ) (not installed) R3–R6, R12–R15, R17 9 R7–R11 5 DESIGNATION QTY DESCRIPTION R16, R18 2 10kΩ surface-mount resistors (0805) Panasonic ERJ-6GEYJ103V SW1 1 Tactile switch, J-lead, E-switch TL3301NF160QJ 100kΩ surface-mount resistors (0805) Panasonic ERJ-6GEYJ104V TP1–TP23 23 Triple-turret terminals Keystone Electronics 1598-2 750Ω surface-mount resistors (0805) Panasonic ERJ-6GEYJ751V U1 1 MAX6876 power-supply sequencer Maxim MAX6876ETX Component Suppliers SUPPLIER PHONE WEBSITE E-Switch 763-504-3525 www.e-switch.com Fairchild Semiconductor 800-341-0392 www.fairchildsemiconductor.com International Rectifier 310-252-7105 www.irf.com KEMET 864-963-6300 www.kemet.com Keystone Electronics 718-956-8900 www.keyelco.com Nichicon 858-824-1515 www.nichicon-us.com Panasonic 800-344-2112 www.panasonic.com/industrial Samtec 800-726-8329 www.samtec.com Note: Indicate that you are using the MAX6876 when contacting these component suppliers. Quick Start Required Equipment Before you begin, the following equipment is needed: • Maxim MAX6876EVCMOD2 (contains MAX6876 EV kit board and CMOD232 module) Procedure Do not turn on any power supplies until all connections are completed: 1) Set JMP1 to the 2-3 position for normal UVLO operation. 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. • DC power supply, 9V DC at 200mA (included with CMOD232 module) • Windows 98/2000/XP computer with an available serial (COM) port • Standard 9-pin female-to-male straight-through serial cable • 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. (Powersupply current requirements depend on user configuration and application.) • Test leads with 0.175in banana plugs to connect the MAX6876 EV kit board to power supplies 2 _______________________________________________________________________________________ 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. 3) Ensure JMP3 is not shorted for normal operation (non-MARGIN functionality). See Table 3. 4) Ensure that shorting links at JMP4 and JMP5 are installed to set the desired I2C address as shown in Table 4. The MAX6876 EV kit I2C address must correspond with the I2C address set in the evaluation software. MAX6876 Evaluation Kit/Evaluation System 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 VLOGIC net of the MAX6876EVKIT. See Figure 3 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. 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. 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. 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. 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 I2C address, per Table 4. Click the system menu on the MAX6876 EV software and select Connect. A dialog box opens with pulldown menus for COM port selection and I2C slave address. Alternatively, clicking the Auto Detect checkbox causes the EV software to search serial ports COM1–COM4 and valid I2C addresses for a MAX6876 EV kit. Click the Connect button for the EV software to establish I2C communication. If connection cannot be established, recheck electrical connections, COM port assignment, and the I2C slave address. After the evaluation software locates the CMOD232 module and the MAX6876EVKIT board, the software polls the configuration registers and updates the display every 500ms to reflect the current configuration. Overview Tab The evaluation software Overview tab shows a graphical 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. 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 keyboard, 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. Underlined text on the Overview tab is used to represent configuration register values that can be adjusted by selecting from a pulldown list. Other features, such as Fault Behavior and Power-Down Mode, are configured by radio buttons. The graphical representation of the IN_/OUT_ pairs changes to reflect Simultaneousor Reverse-Order Power-Down Mode. For each IN_/OUT_ pair, a checkbox allows selection of the 100Ω Pulldown resistance, and the adjustable Overcurrent Threshold can also be enabled or disabled for each pair. Checking the Overcurrent Threshold box for an IN_/OUT_ pair causes that channel 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. _______________________________________________________________________________________ 3 Evaluate: MAX6876 5) Set JMP6 to provide either VCC or ABP voltage to the VLOGIC net. The VLOGIC net must be connected 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. Be sure to remove resistors R7–R10 if VLOGIC is to be connected to ABP. Refer to the ABP section of the MAX6876 IC data sheet. Evaluate: MAX6876 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 disconnected are lost when connection is established. 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 nonvolatile EEPROM locations. Figure 2 shows the appear- 4 ance of the Advanced tab for a typical configuration. Configuration register values can be stored in the configuration 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 configuration register 13h, then clear bit 2 of EEPROM location 33h. The Input Pin’s State box allows software remote control of the logic-level voltage applied by the CMOD232 module to the MARGIN, ENABLE, and MR pins of the _______________________________________________________________________________________ MAX6876 Evaluation Kit/Evaluation System Evaluates: MAX6876 Figure 2. Evaluation Software Advanced Tab MAX6876, as long as the shorting links on JMP3 and JMP2 are not installed. Physical jumper settings override any selections made in this box. The MAX6876 can be configured to use its internal reference 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 I2C Enable box allows or prevents power sequencing/tracking to be enabled through the I2C interface. By clicking the Allow enable with I2C checkbox, power sequencing/tracking can be enabled or disabled by clicking the Send Enable Command button. If the Allow enable with I2C checkbox is not checked, the MAX6876 ignores the I2C enable command bit. When I2C enable is allowed by setting register 09h bit to 1, the MAX6876 internal ENABLE is the result of an AND condition between the I2C 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. _______________________________________________________________________________________ 5 Evaluate: MAX6876 MAX6876 Evaluation Kit/Evaluation System System Menu The System menu is used to initiate the serial communication 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. Evaluation software configuration values can also be saved to disk for future reference. Opening a saved configuration file restores the previously saved configuration values to the registers of the connected MAX6876 EV kit. 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. Detailed Description of Hardware Connector J10 mates with the Maxim CMOD232 module, which enables communication with evaluation software 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. 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 standard 0.175in tip-jack (banana plug) connector. Ground connections can be established at J9, J11, and at test points TP21 and TP23. 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. 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. Jumper Function Tables 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 (VCC, banana jack J12) is bypassed near U1 by 1µF capacitor C13, and the internal supply voltage is bypassed by 1µF capacitor C14. The controlled IN_/OUT_ pairs are each bypassed with 10µF capacitors C1–C4. Additional surface-mount component leads are included for larger bypass caps if desired, such as C5–C8. The OUT_ voltages are similarly 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. 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. Table 1. Jumper JMP1, TRKEN Table 3. Jumper JMP3, MARGIN JMP1 SHUNT POSITION 6 FUNCTION 1-2 Adjust undervoltage-lockout threshold using resistor-dividers R1 and R2 2-3 Normal operation; UVLO threshold is 1.285V Table 2. Jumper JMP2, ENABLE JMP2 SHUNT POSITION FUNCTION 1-2 Voltage tracking/sequencing enabled 2-3 Voltage tracking/sequencing disabled Open Evaluation software control of ENABLE through CMOD232 module JMP3 SHUNT POSITION 1-2 Open FUNCTION MARGIN function enabled Normal operation; MARGIN function disabled, or under evaluation software control through CMOD232 module _______________________________________________________________________________________ MAX6876 Evaluation Kit/Evaluation System Evaluates: MAX6876 Table 4. Jumpers JMP4 and JMP5, I2C Slave Address Selection MAX6876 I2C ADDRESS JMP4 SHUNT POSITION JMP5 SHUNT POSITION A1 A0 (BIT 3) (BIT 2) BINARY HEXADECIMAL 1-2 1-2 0 0 101000xx A0h 1-2 Open 0 1 101001xx A4h Open 1-2 1 0 101010xx A8h Open Open 1 1 101011xx ACh Table 5. Jumper JMP6 JMP6 SHUNT POSITION FUNCTION 1-2 VLOGIC supplied from ABP pin of MAX6876 2-3 VLOGIC connected to VCC net (J12) Open CAUTIONARY NOTES Resistors R7–R10 must be removed to prevent loading ABP pin of MAX6876 — — VLOGIC supplied from pin 1 of J10 or TP22 Table 6. Jumper JMP7, CMOD232 Power Connection JMP7 SHUNT POSITION FUNCTION 1-2 VLOGIC receives power from CMOD232 module through pin 1 of J10 Open No connection between CMOD232 module and VLOGIC CAUTIONARY NOTES If shunt at JMP7 is installed, do not connect external voltage to TP22 — _______________________________________________________________________________________ 7 1598 1598 1598 6095 6095 6095 6095 Figure 3. MAX6876 EV Kit Schematic _______________________________________________________________________________________ SIP3 JMP6 3 2 1 TP15 1598 TP14 1598 TP13 1598 TP12 1598 TP11 1598 TP10 TP22 TP9 J12 J9 J4 J3 VCC VCC ABP RESET FAULT OC HOLD R3 100Ω SYNCH R2 OPEN R1 OPEN UVLO IN4 IN3 IN2 C16 1µF R4 100Ω VLOGIC C5 OPEN JMP1 SIP3 VLOGIC R5 100Ω VLOGIC C13 1µF VCC C1 10µF REM 2 C2 10µF R6 100Ω REM 1 C14 1µF ABP C6 OPEN R11 750Ω TRKEN CR1 LED1206 3 ABP C7 OPEN REM C3 10µF VLOGIC C8 OPEN 3 4 TACT SW1 C4 10µF 1 2 FAULT REM OC HOLD SYNCH TRKEN ABP GND VCC JMP2 SIP3 ABP 9 8 7 6 5 4 3 2 1 Q1 IRLR3714 1 GATE1 35 6095 36 IN1 J2 TP1 1598 TP5 1598 2 3 1 2 TP2 1598 Q2 IRLR3714 U1 VLOGIC SIP2 JMP3 2 MAX6876ETX IN2 N.C. IN1 34 11 GATE2 32 14 TP6 1598 JMP7 SIP2 1 TP3 1598 GATE3 29 J1 J2 6095 OUT1 MARGIN ENABLE RESET 10 GATE1 ENABLE 12 MARGIN GATE2 MR MR 33 13 31 OUT2 SDA 15 2 1 28 IN4 4 3 PG1 PG2 PG3 PG4 N.C. REFIN OUT4 6 5 TP4 1598 8 7 10 9 11 12 14 13 PG1 19 16 15 ABP PG2 20 VLOGIC PG3 21 R13 100kΩ GATE4 Q4 IRLR3714 PG4 R12 100kΩ TP7 1598 22 23 24 25 26 27 Q3 IRLR3714 GATE4 OUT3 A1 30 IN3 SCL 16 GATE3 A0 17 8 18 18 17 SDA SCL R14 100kΩ TP8 1598 20 19 J10 GPIO_K3 GPIO_K2 GPIO_K1 A0 A1 R15 100kΩ 2 1 2 1 R18 10kΩ ENABLE MARGIN MR C11 OPEN CR4 LED1206 R9 750Ω VLOGIC VREFIN CR3 LED1206 R8 750Ω C10 OPEN R17 100kΩ R16 10kΩ SDA SCL SIP2 JMP4 SIP2 JMP5 CR2 LED1206 R7 750Ω C15 1µF C9 OPEN J8 J7 J6 1598 TP20 1598 TP19 1598 TP18 TP17 1598 1598 TP23 TP21 6095 JI1 TP16 1598 6095 6095 6095 J2 J5 6095 1598 CR5 LED1206 R10 750Ω C12 OPEN OUT4 OUT3 OUT2 OUT1 Evaluate: MAX6876 MAX6876 Evaluation Kit/Evaluation System MAX6876 Evaluation Kit/Evaluation System Evaluates: MAX6876 Figure 4. MAX6876 EV Kit Component Placement Guide—Component Side _______________________________________________________________________________________ 9 Evaluate: MAX6876 MAX6876 Evaluation Kit/Evaluation System Figure 5. MAX6876 EV Kit PC Board Layout—Top Layer 10 ______________________________________________________________________________________ MAX6876 Evaluation Kit/Evaluation System Evaluates: MAX6876 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 © 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.