MAX8904 Evaluation Kit Evaluates: MAX8904 General Description The MAX8904 evaluation kit (EV kit) is a fully assembled and tested PCB that evaluates the MAX8904 powermanagement IC. The MAX8904 EV kit operates from an input supply range of 3.4V to 13.2V and is controlled by an I2C interface. The MAX8904 includes five step-down converters (1V2, 1V8, 3V3, 5V0, and ADJ), a WLED step-up converter (BST), a current-limited switch (CLS), a current-sense amplifier (CSA) with differential inputs, an active-low open-drain comparator (CMP), and an 8-bit GPIO port. The MAX8904 also controls an external n-MOSFET for input overvoltage protection (13.5V, typ) and an external p-MOSFET for reverse-polarity protection (up to -28V) of downstream circuits. The I2C interface supports output-voltage setting of the ADJ power rail and BST regulator (voltage-source mode), WLED current setting for the BST regulator (WLED current regulator mode), GPIO control, and enable/disable of ADJ, 5V0, BST, CSA, CMP, and CLS blocks. The MAX8904 EV kit also includes WindowsM 2000-, Windows XPM-, and Windows VistaM-compatible software that provides a simple graphical user interface (GUI) for exercising the features of the MAX8904. To evaluate the MAX8904, order the MINIQUSB+ command module along with the MAX8904 EV kit. Features S Input-Voltage Range of 3.4V to 13.2V S 1MHz, Up to 90% Efficient, Synchronous DC-DC Step-Down Converters S Power Converters 1V2, 1V8, and ADJ Operated Out-of-Phase with Respect to 3V3 and 5V0 S 667kHz Step-Up Converter Provides Up to 32V Output for Driving Up to Eight WLEDs S Internal Compensation on All Power Converters S Fast Line- and Load-Transient Responses S Internal Soft-Start and Short-Circuit Protection on All Power Converter Outputs S Input Overvoltage and Reverse-Polarity Protection S 250ms Fault Timer-Based Protection for Overload and Short Circuit S I2C Serial Interface for On/Off Control, Output Voltage, WLED Current, GPIO Setting, and Fault Monitoring S < 10µA Standby Current S Compact, 56-Pin 7mm x 7mm TQFN Package S Fully Assembled and Tested Ordering Information PART Windows, Windows XP, and Windows Vista are registered trademarks of Microsoft Corp. TYPE MAX8904EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION C1 1 0.22FF Q10%, 16V X7R ceramic capacitor (0603) Murata GRM188R71C224KA01D C5 1 2.2FF Q10%, 16V X7R ceramic capacitor (0805) Taiyo Yuden EMK212BJ225KG C2, C10 2 1FF Q10%, 6.3V X5R ceramic capacitors (0603) Murata GRM188R60J105KA01D C6 1 1FF Q10%, 50V X7R ceramic capacitor (1206) Taiyo Yuden UMK316B7105KL C3 1 1FF Q10%, 6.3V X5R ceramic capacitor (0402) Murata GRM155R60J105K C7, C15, C18, C21, C24 5 4.7FF Q10%, 25V X7R ceramic capacitors (0805) Taiyo Yuden TMK212BJ475KG C4 1 1FF Q10%, 16V X7R ceramic capacitor (0805) Taiyo Yuden EMK212BJ105KG C8_1, C8_2 2 22FF Q20%, 4V X5R ceramic capacitors (0603) Taiyo Yuden AMK107BJ226MA For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com. 19-5160; Rev 0; 2/10 MAX8904 Evaluation Kit Evaluates: MAX8904 Component List (continued) DESIGNATION QTY C9, C12, C13, C16, C19, C22 6 0.1FF Q10%, 16V X7R ceramic capacitors (0402) Taiyo Yuden EMK105BJ104KV C11 1 680FF Q20%, 16V aluminum electrolytic capacitor SANYO 16CE680AX 6 22FF Q10%, 6.3V X5R ceramic capacitors (1206) Taiyo Yuden JMK316BJ226ML C25 0 Not installed, ceramic capacitor (0603) C26 1 0.022FF Q10%, 25V X7R ceramic capacitor (0402) Taiyo Yuden TMK105BJ223KV 1 0.01FF Q10%, 16V X7R ceramic capacitor (0402) Murata GRM155R71C104K C14_1, C14_2, C17, C20_1, C20_2, C23 C27 DESCRIPTION C28 1 220pF Q10%, 50V X5R ceramic capacitor (0402) Taiyo Yuden UMK105BJ221KV D1, D2 2 40V, 0.5A Schottky diodes (SOD123) ON Semi MBR0540T1G D3–D10, D11 9 Surface-mount LEDs, blue (0603) Kingbright APT1608PBCA D12 1 D13 DESCRIPTION 1 10FH, 1.2A, 145mI DCR inductor TOKO DE3518 Series 1127AS-100M 2 4.7FH, 1.75A, 60mI DCR inductors TOKO DE3518 Series 1127AS-4R7M 2 4.3FH, 2.65A, 70mI DCR inductors TOKO DE4518 Series 1124BS-4R3M L6 1 10FH, 1.75A, 120mI DCR inductor TOKO DE4518 Series 1124BS-100M Q1 1 30V dual n-/p-MOSFET (8 SO) Fairchild FDS8958B R1, R3 2 10I, 1/16W Q1% resistors (0402) R2 1 0.015I, 1/4W Q1% resistor (1206) Vishay WSL1206R0150FEA L1 L2, L4 L3, L5 R4 1 0I Q1% resistor (0805) 7 0I Q1% resistors (0402) Surface-mount LED, green (0603) Kingbright APT1608CGCK R7, R25, R26, R27 0 Not installed, resistors (0402) R8–R11 4 100I Q1% resistors (0402) Surface-mount LED, yellow (0603) Kingbright APT1608SYCK R12–R19 8 100kI Q1% resistors (0402) R20–R24 5 10kI Q1% resistors (0402) R28 1 24.9kI Q1% resistor (0402) U1 1 Power-management IC (56 TQFN-EP*) Maxim MAX8904ETN+ — 9 Shunts, 2 positions Sullins STC02SYAN or equivalent — 1 PCB: MAX8904 EVALUATION KIT+ D14 1 J1 1 2 x 8 vertical male header J2 1 1 x 8 single-row female receptacle Samtec SSW-108-01-T-S 10 QTY R5, R6, R29, R30–R33 Surface-mount LED, red (0603) Kingbright APT1608SRCP JU1, JU2.0– JU2.7, JU3 2 1 DESIGNATION 2-pin headers, 0.1in Sullins PEC36SAAN or equivalent *EP = Exposed pad. Maxim Integrated MAX8904 Evaluation Kit Evaluates: MAX8904 Component Suppliers SUPPLIER PHONE WEBSITE Fairchild Semiconductor 888-522-5372 www.fairchildsemi.com Kingbright Corporation 909-468-0500 www.kingbrightusa.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Samtec, Inc. 800-726-8329 www.samtec.com SANYO Electric Co., Ltd. 619-661-6835 www.sanyodevice.com Sullins Electronics Corp. 760-744-0125 www.sullinselecstronics.com Taiyo Yuden 847-925-0888 www.yuden.co.jp TOKO 847-297-0070 www.toko.com ON Semiconductor 888-743-7826 www.onsemi.com Vishay 402-563-6866 www.vishay.com Note: Indicate that you are using the MAX8904 when contacting these component suppliers MAX8904 EV Kit Files FILES DESCRIPTION INSTALL.EXE Installs the EV kit files on your computer MAX8904.EXE Application program UNINST.INI Uninstalls the EV kit software TROUBLESHOOTING_USB.PDF Quick Start • Recommended Equipment Variable 14V power supply capable of supplying 5A of output current • Voltmeter • User-supplied Windows 2000, Windows XP, or Windows Vista PC with a spare USB port 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 underlined refers to items from the Windows operating system. Procedure The MAX8904 EV kit is a fully assembled and tested surface-mount board. Follow the steps below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. 1)Visit www.maximintegrated.com/evkitsoftware to download the latest version of the EV kit software, 8904Rxx.ZIP. Save the EV kit software to a temporary folder and uncompress the ZIP file. 2) Install the EV kit software on your computer by running the INSTALL.EXE program inside the tempoMaxim Integrated USB driver installation help file rary folder. The program files are copied and icons are created in the Windows Start | Programs menu. 3) Carefully connect the MINIQUSB+ command module with the MAX8904 EV kit by aligning the 16-pin connector J1 and 8-pin receptacle J2 of the MAX8904 EV kit with the 16-pin receptacle J3 and 8-pin header J4 of the MINIQUSB+ interface board, respectively. 4) Connect the USB cable from the PC to the MINIQUSB+ command module. A Building Driver Database window pops up in addition to a New Hardware Found message if this is the first time the EV kit board is connected to the PC. If a window is not seen that is similar to the one described above after 30s, remove the USB cable from the board and reconnect it. Administrator privileges are required to install the USB device driver on Windows. Refer to the TROUBLESHOOTING_USB.PDF document included with the software if you have any problems during this step. 5) Follow the directions of the Add New Hardware Wizard to install the USB device driver. Choose the Search for the best driver for your device option. Specify the location of the device driver to be 3 MAX8904 Evaluation Kit Evaluates: MAX8904 C:\Program Files\MAX8904 (default installation directory) using the Browse button. 6) Preset the power supply to 7.2V. Turn off the power supply. 7) Connect the positive lead of the 7.2V power supply to the VIN pad. Connect the negative lead of the 7.2V power supply to the GND pad. 8) Turn on the power supply. 9) Start the MAX8904 program by opening its icon in the Start | Programs menu. The EV kit software main window appears, as shown in Figure 1. 10) Normal device operation is verified when Command Module Connected, Device Connected is displayed at the top-left side of the MAX8904 EV kit main window (Figure 1). 11) Verify that the voltage is 1.2V at the 1V2 pad. 12) Verify that the voltage is 1.8V at the 1V8 pad. 13) Verify that the voltage is 3.3V at the 3V3 pad. 14) Verify that the voltage is 5V at the 5V0 pad. 15) Choose 4.000 from the VADJSP (V) group box to set the ADJ output voltage to 4V and check the VADJEN checkbox and press the Write button in the ENABLE/SHUTDOWN group box to turn on the ADJ step-down converter. 16) Verify that the voltage is 4V at the ADJ pad. 17) Verify that the jumper JU1 shunt is installed. 18)Choose 10 from the BSTCSP (mA) group box to set the LED current to 10mA. Choose 32 from the BSTVSP (V)-current mode group box to set the overvoltage threshold for BST current-mode operation to 32V. Check the BSTEN checkbox and press the Write button in the ENABLE/SHUTDOWN group box to turn on the BST step-up converter. 19) Verify that blue LEDs D3–D10 turn on. 20) Switch to the GPIO Configuration tab, as shown in Figure 2. Choose Open-Drain/HiZ from the GPIO Config drop-down list for GPIO4–GPIO7. 21) Verify that LEDs D11–D14 turn on. Detailed Description of Software User-Interface Panel The MAX8904 EV kit uses the MINIQUSB+ command module for an I2C interface to control the MAX8904 configurations. The EV kit software displays two tabs to set the MAX8904 configurations, Power Controller, Status 4 and GPIO Configuration. Changes to the controls followed by a Write/Write All update the appropriate registers of the MAX8904. After any write or read operation, the related command and data sent are shown in the top-middle box. Power Controller, Status Tab The MAX8904 includes five step-down converters (1V2, 1V8, 3V3, 5V0, and ADJ), a WLED step-up converter (BST), a current-limited switch (CLS), a current-sense amplifier (CSA) with differential inputs, and an activelow open-drain comparator (CMP). Their configuration can be set by using the EV kit software. The MODE group box provides control of CSA gain, ADJ, and BST operating mode, CSA overcurrent-fault detection, and overvoltage protection. The output voltage of the ADJ and BST regulator (voltage-source mode), and WLED current for the BST regulator (current-regulator mode), are set through the VADJSP(V), BSTCSP(mA), and BSTVSP(V) group boxes. ENABLE(Checked) allows the host processor to enable/disable the individual block when needed. SHUTDOWN(Unchecked) works in conjunction with the MAX8904 SHDN pin to program which function block is turned off in the event of a power failure. The Fault Status, Overload Fault Status, and VOK Fault Register read-only registers monitor the MAX8904 operating state and fault status. They indicate any overload, short circuit, power-ok, input overvoltage fault, input overcurrent fault, or overtemperature. The STATUS indicators require a Read if a fault or event has occurred, in which case the corresponding indicator flag turns red. Press the CLRFLTS button to clear the status bit and pull FLT back to high if the fault or event is no longer present. Press the REARM button to rearm fault detections. GPIO Configuration Tab The GPIO Configuration tab sheet allows the MAX8904 to configure the GPIO0–GPIO7 to the following modes: • Schmitt-trigger input with an internal 1MI pullup resistor to GPIOPWR • Open-drain output, with an internal 10kI pullup resistor off-state, capable of sinking up to 20mA current • Open-drain output with high-impedance state, capable of sinking up to 20mA current • High-impedance output The status of eight GPIO bits can be read/written by the GPIO Data register. The GPIOs can also perform LED dimming, which is achieved by setting PWM, PWM Bank, and GPIO PWM Control boxes. Maxim Integrated MAX8904 Evaluation Kit Evaluates: MAX8904 Figure 1. MAX8904 EV Kit Software (Power Controller, Status Tab) Maxim Integrated 5 MAX8904 Evaluation Kit Evaluates: MAX8904 Figure 2. GPIO Configuration Tab 6 Maxim Integrated MAX8904 Evaluation Kit Evaluates: MAX8904 Simple I2C/SMBus Commands There are two methods for communicating with the MAX8904, through the normal user-interface panel (Figure 1), or through the SMBus commands available by choosing the Options | 2-wire Interface menu item from the menu bar. The I2C/SMBus commands allow low-level I2C commands to be sent and are typically used for debugging purposes. The Maxim Command Module Interface (CmodGUIForm) window (Figure 3) pops up and includes a 2-wire interface tab that allows for execution of the simple I2C commands. It is necessary to first properly identify the slave address of the MAX8904. This is done by pressing the Hunt for active listeners button. The PWREN pin must be driven high prior to searching for the active listeners, since PWREN enables the 3.3V step-down converter, which powers the I2C pullup resistors and the internal I2C circuitry. The WriteByte and ReadByte protocols can be used to send and receive 8-bit commands directly to the MAX8904 registers. Refer to the MAX8904 IC data sheet for command-byte format. For the Write Byte protocol, the register address is entered in the Command Byte combo box, and the 8-bit data contents are entered in the Data Out combo box. For the Read Byte protocol, the register address is entered in the Command Byte combo box, and the register contents are read back into the Data In edit box. Pressing the Execute button sends the command. The PASS/FAIL indicator flag indicates a successful transaction by turning green. 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. See Figure 3 for an illustration of this tool. Figure 3. Maxim Command Module Interface (CmodGUIForm) Window Maxim Integrated 7 MAX8904 Evaluation Kit Evaluates: MAX8904 Detailed Description of Hardware Step-Down Converters The MAX8904 has four fixed-voltage step-down converters (1V2, 1V8, 3V3, and 5V0) and an adjustable voltage step-down converter ADJ. Table 1 lists the output voltages and currents for each converter. The ADJ converter output voltage can be programmed from 3V to 5.067V in 33.3mV increments using the MAX8904 EV kit software. The PWREN logic-high input turns on the 1V2, 1V8, 3V3, and 5V0 power converters. Once the 5V0 converter is in regulation, it can be disabled by the 5V0EN bit in the Enable register. The ADJ converter can be enabled by checking the ADJEN bit in the Enable register. BST Step-Up Converters The MAX8904 EV kit contains a BST step-up converter that can operate in either current mode or voltage mode. When the Current Mode radio button in the BSTIV group box is selected, select the value from 1mA to 63mA from the BSTCSP(mA) group box to set the current flowing through D3–D10. Select a value from the BSTVSP(V)current mode group box to set the overvoltage threshold for WLED protection. Click on the Voltage Mode radio button to operate the BST converter in voltage mode. The BST output voltage can be programmed by the BSTVSP(V) from 12.5V to 18.7V with 100mV increments. In voltage mode, the BST converter can provide up to 63mA output current. Ensure that the jumper JU1 shunt is not installed and the jumper JU3 shunt is installed to short PCS to GND in voltage mode. Current-Limit Switch The current-limited switch (CLS) allows the MAX8904 to control the amount of current that an external device draws from the input-voltage source. The CLS is connected between the input-voltage source and the target peripheral device. It provides at least 450mA current and is protected under short-circuit conditions. A short-circuit condition that lasts greater than 250ms latches the CLS Table 1. Step-Down Converter Output Voltage and Output Current 8 OUTPUT VOLTAGE (V) 1V2 1.2 CURRENT (mA) 600 1V8 1.8 975 3V3 3.3 1250 5V0 5 800 ADJ 3 to 5.067 1500 off. The CLS can be enabled/disabled by checking/ unchecking the CLSEN bit in the Enable register. Current-Sense Amplifier The current-sense amplifier (CSA) measures the MAX8904 input current and provides an analog voltage output. The CSOUT voltage is given by the following equation: VCSOUT = A V × R2 × IIN where AV = 20V/V or 40V/V (programmed by the CSAG bit in the Mode register), R2 = 0.015I, and IIN = input current. The CSA allows full-scale (1.2V) output for 4A (20V/V) and 2A (40V/V) currents. The CSFLGEN bit is used to enable/disable the CSA input overcurrent-fault-detection feature. If CSFLGEN is set to Enable, the MAX8904 sets the OCIN bit in the Fault Status register and pulls FLT to low when an input overcurrent is sensed at CSOUT. The input overcurrentfault detection is disabled if CSFLGEN is set to Disable. The CSA can be enabled or disabled by checking/ unchecking the CSAEN bit in the Enable register. Open-Drain Comparator The open-drain comparator (CMP) is an uncommitted, 14V, open-drain output comparator with 20mA of sinking capability. The CMP can be enabled or disabled by checking/unchecking the CMPEN bit in the Enable register. Overvoltage and Reverse-Polarity Protection The MAX8904 supports input overvoltage protection (OVP) at 13.5V (typ) by controlling an external n-MOSFET and reverse-polarity protection (down to -28V) of downstream circuits by controlling an external p-MOSFET. As the VIN voltage rises above 4V, the overvoltage charge-pump gate drive is powered up and OVGATE turns on the Q1 n-MOSFET. Once VIN approaches 13.5V, OVGATE is discharged, turning off the Q1 n-MOSFET and disconnecting the downstream circuit from the high input. When the input voltage goes negative, the MAX8904 pulls RPGATE to OVPWR voltage to turn off the external p-MOSFET. When the input voltage rises in the positive direction to a maximum of 30V, RPGATE pulls low and turns on the Q1 p-MOSFET. Maxim Integrated MAX8904 Evaluation Kit Evaluates: MAX8904 GPIO Port The MAX8904 EV kit features an 8-bit GPIO port controller with PWM capability. The GPIO0–GPIO7 can be configured by using the MAX8904 EV kit software as: • Schmitt-trigger input with an internal 1MI pullup resistor to GPIOPWR • Open-drain output, with an internal 10kI pullup resistor off-state, capable of sinking up to 20mA current • Open-drain output with high-impedance state, capable of sinking up to 20mA current • High-impedance output The D11–D14 LEDs are controlled by GPIO4–GPIO7 on the MAX8904 EV kit. Their brightness can be controlled by selecting PWM Enable and setting the PWM duty cycle through PWM Bank Control. Each LED can also be switched between two intensities by toggling its PWM Bank assignment between Bank 0 and Bank 1. A VOK fault occurs either when an output voltage fails to soft-start or due to overload/short-circuit conditions under normal operation, causing the output voltage to fall below its VOK threshold. When a VOK fault occurs on a particular converter or CLS, press the Read button in the VOK Fault Register box to see the corresponding _OK indicator flag turns red. Power Enable Input (PWREN) The Overload register indicates if any overload occurs on the power converters or CLS. The corresponding _OL indicator flag turns red after pressing Read in the Overload Fault Status group box. Shutdown Input (SHDN) The Fault Status register reports all the system faults (fault on BST, VOK, overload, overtemperature, input overcurrent, or input overvoltage). Refer to the MAX8904 IC data sheet for more information. The FLT output goes low immediately after any fault detection. Driving PWREN logic input high turns on 1V2, 1V8, 3V3, and 5V0 default power rails. The 5V0 converter can also be turned on/off through the Enable register once it is in 5V regulation. The 1V2, 1V8, and 3V3 power rails can only be turned off by driving PWREN logic input low. The MAX8904 features an emergency shutdown input (SHDN) to turn off the function blocks preselected by the Shutdown register under power-fail conditions. When an active-low SHDN is asserted, the function blocks whose corresponding bits are programmed to 0 in the Shutdown register are immediately turned off, and the blocks whose bits in the Shutdown register are programmed to 1 remain enabled. The function blocks include CSA, CMP, BST, ADJ, 5V0, and CLS. Fault Handling The MAX8904 EV kit software provides all the fault information in the STATUS group box. The three read-only Maxim Integrated registers, Fault Status, Overload Fault Status, and VOK Fault Register monitor the MAX8904 fault status. They indicate any VOK, overload, or system fault. The STATUS indicators require a Read if a fault has occurred, in which case the corresponding indicator flag turns red. A second Read clears the status bit if the fault is no longer present. Press the Read All button to update all the fault information in the Status registers. User-Supplied I2C Interface To use the MAX8904 EV kit with a user-supplied I2C interface, connect the SDA, SCL, and GND lines from the user-supplied I2C interface to the SDA, SCL, and GND pads on the EV kit. Remove pullup resistors R21 and R22 and install resistors R26 and R27 for the usersupplied I2C interface. For resistors R26 and R27, 2.2kI is recommended. 9 MAX8904 Evaluation Kit Evaluates: MAX8904 VINT 5 R4 0Ω 1 R5 0Ω R2 0.015Ω CLSOUT VIN VSYS LVROUT Q1 6 4 3 C27 0.01µF 7 8 C11 680µF 2 14 53 R32 0Ω 54 55 56 4 R31 0Ω R30 0Ω R29 3 2 0Ω VSYS 8 C15 L3 4.7µF 4.3µ H ADJ 7 6 C13 0.1µF GPIO[0:7] PWREN TP1 SHDN FLT TP2 1 3 5 J1 2 4 6 7 8 9 10 12 14 16 11 13 15 SDA GPIO0 GPIO1 GPIO2 GPIO3 GPIO4 GPIO5 GPIO6 GPIO7 GND VSYS 50 C4 1µF 49 C6 1µF JU1 D1 D2 GND R3 10Ω TP4 51 CMPO D3 D4D5D6D7 D8D9 D10 28 VSYS R24 10kΩ CMPI R23 10kΩ CSOUT 12 CLSIN CS- 1V2LX CS+ OVGATE 1V2BST 1V2FB OVPWR RPGATE 1V8IN ADJIN 1V8LX ADJLX1 ADJLX2 1V8BST 1V8FB ADJBST ADJFB 3V3IN U1 BSTIN MAX8904 3V3LX BSTSW 3V3BST 3V3FB BSTLX 5V0IN BSTFB 5V0LX PCS 5V0BST 5V0FB CMPO TEST 38 1 39 SHDN SHDN SDA R21 10kΩ FLT R20 10kΩ 35 40 41 R28 24.9kΩ C28 220pF GPIOPWR PWREN NOTE: J2 IS FOR MECHENICAL PURPOSE PWREN SCL GPIO0 GPIO1 GPIO2 GPIO3 GPIO4 GPIO5 GPIO6 GPIO7 SDA FLT SHDN PWREN 42 C8_1 C8_2 22µF 45 46 C18 4.7µF L4 4.7µH 47 C16 0.1µF REF GND C12 0.1µF 10 1V8 C17 22µF GND 31 VSYS C21 4.7µF L5 4.3µH 32 33 3V3 C19 0.1µF 30 C20_1 C20_2 22µF 16 C24 4.7µF L6 18 GND VSYS 5V0 10µH 17 C22 0.1µF C23 22µF 15 GND 43 C25 OPEN 19 20 R6 0Ω C10 1µF TP6 3V3 5V0 R7 R8 OPEN 100Ω R9 R10 D1 100Ω 100Ω 4 D13 D12 21 22 23 24 25 26 27 5V0 R11 100Ω D11 GPIO[0:7] GPIO0 GPIO1 GPIO2 GPIO3 GPIO4 GPIO5 GPIO6 GPIO7 JU2 EP 11 GND VSYS 44 3V3 CSOUT 1V2 C9 0.1µF 36 CMPI JU2.7 JU2.6 JU2.5 JU2.4 JU2.3 JU2.2 JU2.1 JU2.0 R19 100kΩ AGND 3V3 R22 10kΩ L2 4.7µH 37 SCL 34 VSYS C7 4.7µF R25 OPEN 29 J2 13 LVRPWR LVROUT LVRIN5V CLSOUT 1V2IN JU3 52 R26 OPEN C3 1µF L1 10µH 48 SCL TP3 9 C14_1 C14_2 22µF BST R27 OPEN 5 C5 2.2µF C2 1µF C1 0.22µF R33 0Ω C26 0.022µF R1 10Ω R12 100kΩ R18 R17 R16 R15 R14 R13 100k 100k 100k 100k 100k 100k Figure 4. MAX8904 EV Kit Schematic 10 Maxim Integrated MAX8904 Evaluation Kit Evaluates: MAX8904 4362Mils 2802Mils 1.0” Figure 5. MAX8904 EV Kit Component Placement 4362Mils 2802Mils 1.0” Figure 6. MAX8904 EV Kit PCB Layout—Top Layer 1 Maxim Integrated 11 MAX8904 Evaluation Kit Evaluates: MAX8904 4362Mils 2802Mils 1.0” Figure 7. MAX8904 EV Kit PCB Layout—PGND Layer 2 4362Mils 2802Mils 1.0” Figure 8. MAX8904 EV Kit PCB Layout—Power Layer 3 12 Maxim Integrated MAX8904 Evaluation Kit Evaluates: MAX8904 4362Mils 2802Mils 1.0” Figure 9. MAX8904 EV Kit PCB Layout—Routing Layer 4 4362Mils 2802Mils 1.0” Figure 10. MAX8904 EV Kit PCB Layout—GND Layer 5 Maxim Integrated 13 MAX8904 Evaluation Kit Evaluates: MAX8904 4362Mils 2802Mils 1.0” Figure 11. MAX8904 EV Kit PCB Layout—Bottom Layer 6 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. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. 14 © 2010 Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.