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SMSC USB375x EVB Revision 1.1 (08-29-11) USER MANUAL USB375x EVB - Evaluation Board User Manual 1 Introduction This user manual is for the USB3750 Evaluation board. This board can be used to test and evaluate the functionality of the USB3750 and USB3751. The USB375x EVB exposes the upstream and downstream ports, as well as the I2C communication pins. There is also SMSC software that can be used with the USB375x EVB and a Total Phase Aardvark adaptor that can be used to communicate with the USB3750. This software can be used to evaluate the functionality of the USB3750, prototype microprocessor software, and test how the USB3750 fits into the entire system. The Total Phase Aardvark adaptor is not included with the USB375x EVB. 2 Hardware The USB375x EVB is a simple board that demonstrates the capabilities of the USB3750. The board consists of the upstream and downstream ports, a VOUT LED for visual confirmation of the switch functionality, an I2C header exposing the I2C pins, and additional circuitry that is used for proper I2C communication. 2.1 USB Ports The USB ports are mounted on the edges of the USB375x EVB. The downstream ports use the standard USB Type A receptacle. The label for the port is located below the receptacle. The upstream port can be a standard USB Type B, mini-B or micro-B receptacle. Upstream Downstream2 Downstream1 Figure 2.1 Upstream and Downstream Ports 2.2 Test Points and LEDs The USB375x EVB also breaks out the remaining pins. TP1 connects to GND, TP2 connects to the VBUS pin, and TP3 connects to the VOUT pin. The VOUT pin is also connected to LED4 to confirm that the OVP switch is enabled or disabled. When the LED turns on, the OVP switch is closed and power can flow from the upstream port to VOUT. Revision 1.1 (08-29-11) 2 USER MANUAL SMSC USB375x EVB USB375x EVB - Evaluation Board User Manual The SCL, SDA and INT_B pins are also exposed on the J6 header. These pins are compatible with the Aardvark pinout, where pin 1 of the Aardvark connector connects to pin 1 of the header or SCL. TP1 TP2 TP3, LED4 J6 Figure 2.2 Test points, LED and Header 2.3 Vcc I2C Regulator The USB375x EVB contains circuitry to pull up the I2C pins to a specified Vcc voltage. The Vcc voltage can be adjusted by choosing the proper R21 resistance. R10, R11 and R12 are used to pull the I2C pins up to Vcc. The current value of the I2C pullups are10k Ω , but a smaller value may need to be selected for 1MHz operation. The current Aardvark speed is at a very slow clock speed. RPU Vcc Figure 2.3 Vcc Regulator and I2C Pull-up Resistors SMSC USB375x EVB 3 USER MANUAL Revision 1.1 (08-29-11) USB375x EVB - Evaluation Board User Manual 3 Software The USB375x EVB comes with a CD that contains evaluation software that can be used with the Total Phase Aardvark adaptor. To install the software, run Setup.exe, found on the CD. This will install the USB3750 Evaluation Software, the LabVIEW Run-time engine (to run the executable), and the Total Phase drivers to communicate with the Aardvark. Once the software has been installed, locate and run the USB3750 Eval.exe program on the computer. The tab on the right is labeled Charger Detect; This tab shows how the USB3750 can be used to detect the connection of the upstream port. In this section the code is simply polling the status register, and updating the display accordingly. Figure 3.1 Charger Detect with No Connection and SDP Connection Revision 1.1 (08-29-11) 4 USER MANUAL SMSC USB375x EVB USB375x EVB - Evaluation Board User Manual The middle tab is labeled Switch Control; this tab is a graphical way to change which downstream port is connected to the upstream port. Simply click on the port to route it upstream, and click on the middle of the board to route none of the dowstream ports. Figure 3.2 Switch Control Options The left tab contains a general I2C register read/write screen. The boxes and strings display the bits descriptions found in the USB3750 datasheet. The register menu and digital display can be used to select the proper register to manipulate. The click on the value or bit box above to change the value of the register. Once the desired value and register are selected, press the Write button to change the value on the part. Click on the Read button and the Value and Bit boxes will update the current value SMSC USB375x EVB 5 USER MANUAL Revision 1.1 (08-29-11) USB375x EVB - Evaluation Board User Manual on the part. Refer to the USB3750 datasheet for a detailed description of each register and operation of the device. Figure 3.3 I2C Register Access Revision 1.1 (08-29-11) 6 USER MANUAL SMSC USB375x EVB 7 USER MANUAL A B C D +5.0V 5 INT_B SCL SDA R12 10.0k J6 2 4 6 8 10 HDR_2x5 1 3 5 7 9 I2C Interface 3 2 1 FB Vout 4 5 VCC_I2C = 1.8 V VCC_I2C = 2.0 V VCC_I2C = 2.5 V VCC_I2C = 3.0 V VCC_I2C = 3.3 V TPS77001DVBT /EN GND Vin U2 R22 169k R21 287k VCC_I2C Regulator R11 10.0k R21 = 78.7K R21 = 107 K R21 = 178K R21 = 243K R21 = 287K C3 1.0uF R10 10.0k VCC_I2C TP2 GND Black VBUS TP1 3 C4 10uF 6.3V VCC_I2C SDA SCL INT_B C1 1.0uF 50V VOUT YELLOW U1 DP_1 VBUS VBUS VBUS 4 R13 ZERO 1/10W +5.0V USB3750 1 2 3 4 DM_2 VOUT VOUT VOUT Flag 12 11 10 9 17 VOUT R1 1M DNP R2 1M DNP C2 4.7uF 3 R3 1M DNP TP3 VOUT VOUT RED R4 1M DNP R5 1M DNP 1 2 LED4 Blue R19 1.00k R6 1M DNP DP1 DM1 DP DM DP2 DM2 VBUS DM DP 2 VOUT VOUT DP2 DM2 R14 DP1 DM1 Date: Size B P1 1 2 3 4 5 6 7 8 9 P2 VBUS DD+ ID GND SHIELD1 SHIELD2 SHIELD3 SHIELD4 USB-A SHLD1 SHLD2 VCC D+ DGND USB-A P3 SHLD1 SHLD2 VCC D+ DGND 6 7 8 9 10 11 USB MICRO-AB DNP SHLD1 SHLD2 SHLD3 SHLD4 SHLD5 SHLD6 USB mini AB SMD P4 1 2 VBUS 3 D4 D+ 5 ID GND 5 6 1 3 2 4 5 6 1 3 2 4 Wednesday, August 24, 2011 Document Number SCH-7230AZ-C00 PCB7230: USB3750 Evaluation Board R20 ZERO Title ZERO ZERO R7 USB3750 16-pin QFN Evaluation Board 4 16 15 14 13 DM_1 DP DM DP_2 SDA SCL INT_B GND 5 6 7 8 R/ANGLE USB A CON R/ANGLE USB A CON SMSC USB375x EVB 2 5 1 1 of 1 3930 East Ray Road Suite 200 Phoenix, Arizona 85044 480-759-0200 Sheet 1 Rev A B C D USB375x EVB - Evaluation Board User Manual 4 USB375x EVB Schematic Figure 4.1 USB375x EVB Schematic Revision 1.1 (08-29-11) Revision 1.1 (08-29-11) Quantity 1 2 1 1 1 2 0 1 3 10 3 2 1 1 1 1 1 1 Item # 1 2 3 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Part Reference C1 C2 C4 C3 J6 LED4 P1 P3 P2 P4 R1 R2 R3 R4 R5 R6 R7 R8 R9 R13 R14 R15 R16 R17 R18 R20 R10 R11 R12 R21 R22 R23 TP1 TP2 TP3 U1 U2 RESISTOR 10.0K OHM 1/10W 1% 0603 RESISTOR 78.7K OHM 1/16W 1% 0402 SMD RESISTOR 470 OHM 1% 1/10W 0603 TEST POINT LOOP COMPACT BLACK TEST POINT TEST POINT LOOP COMPACT YELLOW USB3750 IC ADJ 50MA LDO REG SOT-23-5 RESISTOR ZERO OHM 1/10W 5% 0603 Description CAPACITOR CERAMIC 1.0UF 50V Y5V 0805 CAPACITOR CERAMIC 10UF 6.3VDC 20% X5R 08 CAPACITOR CERAMIC 1.0UF 6.3V 20% X5R 040 HEADER, 2 X 5, 0.1 INCH, VERTICAL LED GREEN SMT RECEPTACLE, USB, STYLE B, RIGHT ANGLE CONNECTOR RECEPT USB MINI AB 5POS RT ANG CONNECTOR RECEPT MICRO USB TYPE AB SMT RESISTOR 1MEG OHM 1/10W 5% 0603 8 USER MANUAL 296-2762-1-ND 311-10.0KHRCT-ND 541-78.7KLCT-ND 311-470GRCT-ND 5006K-ND 5015KCT-ND 5009K-ND 311-0.0GRCT-ND Digikey_Number 445-1364-1-ND PCC2225CT-ND 490-1319-1-ND SAM1030-05-ND 404-1005-1-ND 609-1045-ND WM17122CT-ND A97799CT-ND 311-1.0MGRCT-ND YAGEO VISHAY-DALE YAGEO KEYSTONE KEYSTONE KEYSTONE SMSC TEXAS INSTRUMENTS YAGEO Manuf TDK PANASONIC MURATA ERIE SAMTEC STANLEY FCI MOLEX TYCO ELECTRONICS YAGEO RC0603FR-0710KL CRCW040278K7FKED RC0603JR-07470RL 5006 5015 5009 USB3750 TPS77001DBVT RC0603JR-070RL Manuf_PN C2012Y5V1H105Z ECJ-2FB0J106M GRM155R60J105ME19D TSW-105-07-L-D BG1111C-TR 87520-0010BLF 56579-0576 1981584-1 RC0603JR-071ML Yes Yes Yes Yes Yes Yes Yes Yes Yes RoHS DNP Yes Yes Yes Yes Yes Yes P2 Yes Yes R1 R2 R3 R4 R5 R6 Yes USB375x EVB - Evaluation Board User Manual 5 USB375x EVB Bill of Materials Figure 5.1 USB375x EVB Bill of Materials SMSC USB375x EVB