MAX5946LEVCMODU MAXIM | Alldatasheet

Document overview

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Technical content

Features

♦ Demonstrates PCI Express-16 Dual Hot-Plug Design ♦ Independent Output Controls for Each Channel ♦ 12V at Up to 5.5A (Adjustable) ♦ 3.3V at Up to 3A (Adjustable) ♦ 3.3VAux at Up to 0.375A ♦ Evaluates Hot-Plugging PCI Express x1, x4, x8, or x16 Cards ♦ Demonstrates Input Inrush-Current Control ♦ Demonstrates Output Overcurrent/Short-Circuit Protection ♦ Monitors Input Undervoltage for 12V, 3.3V, and 3.3VAux with Status Reports ♦ Configurable Power-On Reset (POR) ♦ Independent On/Off Controls for Channels A/B (12V/3.3V and 3.3VAux) ♦ Independent +3.3VAux Output with Separate On/Off Control ♦ Latched Output after Fault Conditions (12V, 3.3V, 3.3VAux) ♦ Input/Output Interface Using a MAX7313 I/O Expander (SMBus Interface) or Local Control ♦ Controlled Locally without Software ♦ Windows 98/2000/XP-Compatible Software ♦ Surface-Mount Components ♦ Fully Assembled and Tested Evaluate: MAX5946A/MAX5946L MAX5946L Evaluation Kit/Evaluation System

Ordering Information

19-3621; Rev 0; 1/05 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. *EP = Exposed paddle. PCI Express is a trademark of PCI-SIG Corp. SMBus is a trademark of Intel Corp. Windows is a registered trademark of Microsoft Corp. PART TEMP RANGE IC PACKAGE SMBus INTERFACE TYPE MAX5946LEVKIT 0°C to +70°C 36-Thin QFN-EP* Not Included M AX 5946LE V C M OD U 0°C to +70°C 36-Thin QFN-EP* CMODUSB Note: The MAX5946L EV kit software is provided with the MAX5946LEVKIT. However, the CMODUSB interface board is required to interface the EV kit to the computer when using the software. MAX5946LEVCMODU (MAX5946L EV System) Component List PART QTY DESCRIPTION MAX5946LEVKIT 1 MAX5946L evaluation kit CMODUSB 1 SBMus interface board

Evaluate: MAX5946A/MAX5946L MAX5946L Evaluation Kit/Evaluation System DESIGNATION QTY DESCRIPTION C1 1 1500µF, 16V electrolytic capacitor (12.5mm x 13.5mm case) Panasonic EEVFK1C152Q C2 1 3300µF, 6.3V low-Z electrolytic capacitor (12.5mm x 13.5mm case) Sanyo 6.3CV3300KX C3, C7, C8 3 10µF ±20%, 25V X7R ceramic capacitors (1812) TDK 4532X7R1E106M C4, C13–C18 7 1µF ±10%, 16V X7R ceramic capacitors (0805) Murata GRM21BR71C105K C5, C6 2 0.1µF ±10%, 16V X7R ceramic capacitors (0603) Murata GRM188R71C104K C9–C12 0 Not installed, ceramic capacitors (0805) D1, D2, D3, D6–D10 8 Green surface-mount LEDs (1206) D4, D5 2 Yellow surface-mount LEDs (1206) D11 1 1A, 40V Schottky diode (SOD-123) Diodes Inc. 1N5819HW J1, J2 2 PCI Express-16 connectors Molex 87715-3305 J3 1 16-pin header J4 1 2 x 10 r i g ht- ang l e fem al e r ecep tacl e JU1–JU4 4 2-pin headers JU5–JU8 4 3-pin headers N1–N4 4 20V , 13.4A n- channel M OS FE Ts ( S O- 8) V i shay S i 7448D P - T1 R1, R2 2 0.008Ω ±2%, 0.5W sense resistors (2010) IRC LRC-LRF2010-01-R008-G or Vishay WSL20108L600F DESIGNATION QTY DESCRIPTION R3, R4 2 0.005Ω ±1%, 0.5W sense resistors (2010) Vishay WSL2010R005F R5, R8, R19, R20, R21, R26, R27, R34–R37

0 Not installed, resistors (0805)

R6, R7, R9–R12, R15, R16, R22, R23, R24 11 10k Ω ±5% resistors (0603) R13, R14, R17, R18, R28, R29, R32, R33 8 150 Ω ±5% resistors (0603) R25 1 750 Ω ±1% resistor (1210) R30, R31 2 1k Ω ±5% resistors (1206) R38–R41 4 51k Ω ±5% resistors (0603) R42, R43 2 3.3k Ω ±5% resistors (0603) SW1, SW2 2 SPST momentary-contact switches SW3–SW6 4 SPDT slide switches TP 1–TP 4, TP 6–TP 10, TP 21, TP 22, TP 27, TP 28

13 PC test points, red

TP 5, TP 11, TP 12, TP 15–TP 20, TP 29, TP 30

11 PC test points, black

TP13, TP14, TP23–TP26 6 PC test points, miniature, red U1 1 MAX5946LETX (36-pin thin QFN, 6mm x 6mm) U2 1 16-port I/O expander (24-pin thin QFN, 4mm x 4mm) Maxim MAX7313ATG V IN1, VIN 2, V IN3, GN D, GND 5 Uninsulated banana jacks None 8 Shunts (JU1–JU8) None 5 Rubber bumpers None 1 MAX5946L evaluation kit software CD-ROM Component List

  • One each of the following DC power supplies: 12V at 12A (the 12V supply must be rated 12A or higher) 3.3V at 10A
  • Three voltmeters The 3.3V power supply can be used to power the main 3.3V and 3.3V_AUX inputs. The MAX5946L EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. Note: The banana leads connecting the 12V and 3.3V power supply to the EV kit must be short (<12 inches long). MAX5946L Configuration A/B Channel Outputs 1) Verify that shunts are installed on jumpers JU1 (PRES-DETA) and JU2 (PRES-DETB). 2) Verify that shunts are not installed on jumpers JU3 (MRLA) and JU4 (MRLB). 3) Verify that shunts are installed on pins 1 and 2 of jumpers JU5–JU8 (local switch control). 4) Set switches SW3 (ONB) and SW4 (AUXONB) to the ON position (Channel B). 5) Set switches SW5 (ONA) and SW6 (AUXONA) to the ON position (Channel A). 6) Utilizing short 10A-rated banana leads (<12in long) connect the 12V DC power supply to the VIN1 banana jack. Utilizing short 10A-rated banana leads (<12in long) connect the supply ground to the GND banana jack. 7) Utilizing short 10A-rated banana leads (<12in long) connect the 3.3V DC power supply to the VIN2 banana jack. Utilizing short 10A-rated banana leads (<12in long) connect the supply ground to the GND banana jack. 8) Connect the 3.3V DC power supply to the VIN3 banana jack with a short banana lead. Connect the supply ground to the GND banana jack. 9) Connect a voltmeter to the 12VA pad or test point TP1 and GND. Connect a voltmeter to the 3.3VA pad or test point TP9 and GND. Connect a volt- meter to the 3.3VAUXA pad or test point TP10 and GND. 10) Turn on both power supplies in any sequence. 11) Verify that the voltage at the following pads is as shown below: a. 12VA, 12VB = 12V b. 3.3VA, 3.3VB = 3.3V c. 3.3VAUXA, 3.3VAUXB = 3.3V 12) Sliding switches SW5 and SW6 to the OFF position will disable channel A on the MAX5946L EV kit dual hot-plug controller. 13) Sliding switches SW3 and SW4 to the OFF position will disable channel B on the MAX5946L EV kit dual hot-plug controller. 14) Test points TP25, TP26, TP24, TP23, and GND pads nearby are provided to observe MOSFETs N1–N4 gate voltage, respectively, with an oscilloscope. See the MAX7313 Input/Output Expander and SMBus Interface section for configuring the Input/Output Expander and using the CMODUSB interface board. Evaluate: MAX5946A/MAX5946L MAX5946L Evaluation Kit/Evaluation System SUPPLIER PHONE FAX WEBSITE Diodes Inc. 805-446-4800 805-446-4850 www.diodes.com IRC 361-992-7900 361-992-3377 www.irctt.com Murata 770-436-1300 770-436-3030 www.murata.com Panasonic 714-373-7366 714-737-7323 www.panasonic.com Sanyo Electronic Device 619-661-6835 619-661-1055 www.sanyodevice.com TDK 847-803-6100 847-390-4405 www.component.tdk.com Vishay — — www.vishay.com Component Suppliers Note: Indicate that you are using the MAX5946L when contacting these component suppliers.

nels are provided to evaluate a PCI Express-16 card. channels’ output power and monitor for faults. used for the 12V and 3.3V outputs of each channel. auxiliary outputs of each channel. be reconfigured after installing resistor R27. MAX5946L de-bounced logic gate outputs. the MOSFET’s gate R and C designators. the appropriate current-sense resistor, R1 or R2. the PCI Express-16 connectors. must be rated for at least 10A and be shorter than 12in. reconfigured for lower output currents. this document for more details. play the functions provided by the MAX5946L EV kit. Table 1. Channel A and B Presence-Detection Functions *When using a real PCI Express card, these jumper shunts must be removed so that the card has control of the presence detection.

occurred. Table 2 lists the various switch options. occurred. Table 3 lists the various switch options. to select the values of resistors R5 or R27. mount resistor R8. Typical values are less than 1kΩ. MAX5946A. Replace U1 with the MAX5946A IC. Table 2. Channel A Switch Functions Table 3. Channel B Switch Functions

and OUT signals of the MAX5946L for each channel. MAX7313 default SMBus address is 0x40. U2 will be destroyed when switching logic states . See Table 4 for configuration of jumpers JU5–JU8. verting between hexadecimal and binary data. Table 4. MAX5946L Channel A and B On Signals Configuration Figure 1. MAX5946L Evaluation Software’s Main Window for

Table 5. MAX7313 Port Configuration/Function for Channel A Table 6. MAX7313 Port Configuration/Function for Channel B Figure 2. The two-wire interface window provides direct, low-level access to the MAX5946L through the SMBus 2-wire interface.

Evaluate: MAX5946A/MAX5946L General-Purpose Two-Wire Interface Utility The General-Purpose Two-Wire Interface Utility is used to communicate with the MAX7313 and thus controls or reads back signals from the MAX5946L. The utility con- figures the SMBus interface parameters such as Start and Stop bits, Acknowledgements, and clock timing. The Two-Wire Interface screen allows you to send general-purpose SMBus commands using the SMBusWriteByte and SMBusReadByte. All data is in hexadecimal format. The “Hunt for active listeners” button scans the entire 2-wire address space, reporting each address that is acknowledged. The SMBusWriteByte transmits the device address, command, and one byte of data. The SMBusReadByte transmits the device address, a com- mand, and then retransmits the device address and reads one byte of data. Software Quick Start 1) Install shunts on pins 2 and 3 of jumpers JU5–JU8 (computer control) on the MAX5946L EV kit. 2) Connect the CMODUSB interface board to the MAX5946L EV kit’s J4 connector. 3) Set both CMODUSB SW1 switches to enable. These provide pullup resistors for the SMBus. 4) Connect the computer’s USB port to the CMODUSB interface board with a USB cable. 5) Install the MAX5946L evaluation software on your computer by running the INSTALL.EXE program on the CD-ROM disk. The program files are copied and icons are created for them in the Windows Start menu. Restart the computer when prompted. For Windows 2000 or XP, you may need administrator privileges. 6) Turn on the power supplies for the EV kit. 7) Start the MAX5946L program by opening its icon in the Start menu. 8) Configure the MAX7313 I/O Expander for operation as follows. Port configuration:

  • Configure the MAX7313 ports to Inputs/Outputs per Tables 5 and 6 above by using the SMBusWriteByte command to write 0x33 data to command bytes 0x06 and 0x07. Reading from channels A or B:
  • To read a specific channel, use the SMBusReadByte command. Use the 0x00 command byte for reading the ports on channel A. Use the SMBusReadByte command and the 0x01 command byte for reading the ports on channel B. Writing to channels A or B:
  • To write a specific channel, use the SMBusWriteByte command. Use the 0x02 command byte for writing to the ports on chan- nel A. Use the SMBusWriteByte command and the 0x03 command byte for writing to the ports on channel B. Enter the desired hexadecimal data in the Dataout Edit field.
  • When writing to an output ( 0x03, 0x04) the data corresponding to input bits are ignored and are therefore “don’t care” bits. The main window hexadecimal and binary combo boxes can be used to convert between both number formats. The general-purpose Two-Wire Interface Utility only accepts and outputs a hexadecimal number format. General Troubleshooting Problem: Software reports it cannot find the board.
  • Is the CMODUSB board power LED lit?
  • Is the USB communications cable connected?
  • Has Windows plug-and-play detected the board? Bring up Control Panel->System->Device Manager, and look at what device nodes are indicated for USB. If there is an “unknown device” node attached to the USB, delete it—this forces plug-and-play to try again. Problem: Unable to find DUT (device under test).
  • Are the SCL and SDA signals pulled up to VDD? The CMODUSB dip-switch SW1 enables the on-board resistors on the CMODUSB interface board. There must be pullup resistors somewhere on the bus.
  • If using jumper wires to connect, could the SCL and SDA signals be swapped? Could the ground return be missing? MAX5946L Evaluation Kit/Evaluation System

Figure 3. MAX5946L EV Kit Schematic

3 SW3

78 GND

3 SW4

Figure 4. MAX5946L EV Kit Schematic, PCI Express-16 Connectors