MAX14550EEVKIT+

19-4944; Rev 0; 9/09 MAX14550E Evaluation Kit The MAX14550E evaluation kit (EV kit) provides a proven design to evaluate the MAX14550E USB host charger identification analog switch. The Hi-Speed USB transmission lines (D+ and D-) have 90I differential impedance traces to meet Hi-Speed USB specs. The MAX14550E EV kit comes with a MAX14550EETB+ installed. Features S Hi-Speed USB (480Mbps) S 90I Differential Traces for USB 2.0 S USB Powered S Test Points for Easy Evaluation S Proven PCB Layout S Fully Assembled and Tested Ordering Information PART TYPE MAX14550EEVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY C1, C3, C4, C6–C9 7 C2, C5, C10 3 DESIGNATION QTY 0.1FF Q10%, 16V X7R ceramic capacitors (0603) Murata GRM188R71C104K R4, R6 2 49.9kI Q1% resistors (0603) R5 1 43.2kI Q1% resistor (0603) R7, R8 2 0I Q5% resistors (0603) 10FF Q20%, 6.3V X5R ceramic capacitors (0603) Murata GRM188R60J106M R9, R10 2 470I Q5% resistors (0603) TP1, TP3, TP5 3 Red multipurpose test points TP2, TP4, TP6 3 Black multipurpose test points TP7, TP8, TP9 0 Not installed, miniature test points U1 1 Host USB charger switch (10 TDFN-EP*) Maxim MAX14550EETB+ — 1 USB high-speed A-to-B cables, 5ft — 1 USB A-to-micro-B cable, 1m — 6 Shunts — 1 PCB: MAX14550E EVALUATION KIT+ DESCRIPTION D1, D2 2 Green LEDs (0603) JU1, JU2, JU5, JU6 4 3-pin headers JU3, JU4 2 2-pin headers JU7 0 Not installed, 2-pin header P1 1 USB type-A, right-angle PC-mount receptacle P2 1 USB type-B, right-angle PC-mount receptacle R1, R2 0 Not installed, resistors (0603) R3 1 75kI Q1% resistor (0603) DESCRIPTION *EP = Exposed pad. Component Supplier SUPPLIER Murata Electronics North America PHONE 770-436-1300 WEBSITE www.murata-northamerica.com Note: Indicate that you are using the MAX14550E when contacting this component supplier. ________________________________________________________________ Maxim Integrated Products   1 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. Evaluates: MAX14550E General Description Evaluates: MAX14550E MAX14550E Evaluation Kit Quick Start Required Equipment • MAX14550E EV kit • 5V, 10mA power supply • Digital multimeter (DMM) Procedure The MAX14550E EV kit is fully assembled and tested. Follow the steps below to verify board operation: 1) V  erify that all jumpers (JU1–JU6) are in their default positions, as shown in Table 1. 2) C  onnect the positive terminal of the 5V supply to TP1 (+5V) and the GND terminal to TP2 (GND). Do not apply power between TP1 and TP2 if a USB type-B cable is plugged into P2 coming from the PC. 3) S  et the DMM as an ohmmeter and verify that the connection between DP (JU7, D+) and TDP (TP7) is less than 10I. Repeat for DM (JU7, D-) and TDM (TP8). The default condition for the MAX14550E is CB0 = CB1 = 1 (USB traffic active). 4) S  et the shunt on JU5 to the 2-3 position (CB0 = 0, CB1 =1). 5) U  nder this setting, DP and DM are shorted to each other. Measure the resistance across JU7. A resistance less than 100I represents a short between DP and DM. 6) S  et the shunt on JU5 to the 1-2 position and set the shunt on JU6 to the 2-3 position (CB0 = 1, CB1 = 0). 7) U  nder this setting, RDP is shorted to DP and RDM is shorted to DM (JU3 should be open by default). DP and DM are connected to external resistor-dividers through RDP and RDM, respectively. Verify that the voltage between RDP and DP is the same. Also verify that the voltage between RDM and DM is the same. 8) C  hange the shunt on JU3 to the closed position. Shorting RDP to GND causes the MAX14550E to connect DP and DM to the internal resistor-dividers. The voltage on DP and DM is similar to the voltage on RDP and RDM when JU3 is open, because the external resistor-dividers are closely matched to the internal voltage-dividers. Table 1. MAX14550E EV Kit Jumper Description (JU1–JU6) JUMPER SHUNT POSITION JU1 JU2 JU3 JU4 JU5 JU6 DESCRIPTION 1-2* Connects VCC to +5V from VBUS on P2. When the USB cable is plugged into the PC, VBUS voltage appears on TP1. 2-3 Connects VCC to TP3 (EXTVCC). Apply an external 5V supply between TP3 and TP4. 1-2* Selects VCC as charging source for P1 2-3 Selects TP5 (EXTCHG) as the charging source for P1. Apply the external 5V supply between TP5 and TP6. Open* External voltage-divider is used Closed Internal voltage-divider is used Open Closed* RDM test point Normal operation 1-2* CB0 is connected to VCC (CB0 = 1) 2-3 CB0 is connected to GND (CB0 = 0) 1-2* CB1 is connected to VCC (CB1 = 1) 2-3 CB1 is connected to GND (CB1 = 0) *Default position. 2   _______________________________________________________________________________________ MAX14550E Evaluation Kit The MAX14550E EV kit provides a proven layout to evaluate the MAX14550E USB host charger identification analog switch. The D+ and D- lines have 90I differential impedance to meet USB 2.0 signal-integrity specifications. The MAX14550E is powered by VBUS by default. Jumpers and shunts are on the EV kit to separate VBUS from VCC and the charger voltage. VBUS can be limited to 100mA or 500mA due to USB current-limit specs, but when the host acts as a stand-alone charger, the charging current can be much greater. Change the shunt on JU1 to the 2-3 position to power VCC externally from a 5V regulated supply. VCC is by default the charger voltage. The charger voltage can be isolated from VCC by changing the shunt on JU2 to the 2-3 position. Green LEDs on the EV kit indicate power at each USB connector. Control Settings for CB0 and CB1 (JU5, JU6) JU5 and JU6 correspond to CB0 and CB1, respectively. Table 2 shows the different MAX14550E states. The external resistor-divider on RDP/RDM is connected to DP/DM if JU3 is open. When JU3 is closed, DP and DM are connected to the internal resistor-divider. Autodetection Autodetection chooses between the charger detection states. The first state causes D+ and D- to be shorted to each other (CB0 = 0, CB1 = 1). The second state causes D+ and D- to be connected to an internal or external resistor-divider from VBUS (CB0 = 1, CB1 = 0). Autodetection chooses one of these two states depending on the voltage on DM. Table 2. Digital Inputs States CB0 CB1 DP/DM COMMENT INTERNAL RESISTOR-DIVIDER STATE IF NO EXTERNAL DIVIDER IS PRESENT 0 0 Autodetection circuit active — Connected 0 1 Shorted together Auto mode disabled Not connected 1 0 Connected to resistordividers Auto mode disabled Connected 1 1 Connected to TDP/TDM USB traffic active Not connected _______________________________________________________________________________________   3 Evaluates: MAX14550E Detailed Description of Hardware Evaluates: MAX14550E MAX14550E Evaluation Kit Figure 1. MAX14550E EV Kit Schematic 4   _______________________________________________________________________________________ MAX14550E Evaluation Kit Figure 2. MAX14550E EV Kit Component Placement Guide— Component Side Figure 3. MAX14550E EV Kit PCB Layout—Component Side 1.0’’ Figure 4. MAX14550E EV Kit PCB Layout—GND Layer 2 _______________________________________________________________________________________   5 Evaluates: MAX14550E 1.0’’ 1.0’’ Evaluates: MAX14550E MAX14550E Evaluation Kit 1.0’’ Figure 5. MAX14550E EV Kit PCB Layout—VCC Layer 3 1.0’’ Figure 6. MAX14550E EV Kit PCB 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. 6 ©  2009 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.