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USB375x Evaluation Board User Manual
Copyright © 2011 SMSC or its subsidiaries. All rights reserved.
Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies.
SMSC reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest
specifications before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under
any patent rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently
dated version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects
or errors known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products
are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe
property damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer.
Copies of this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is
a registered trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.
SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE
OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR
CONSEQUENTIAL DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER
BASED ON CONTRACT; TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY
REMEDY OF BUYER IS HELD TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
SMSC USB375x EVB Revision 1.1 (08-29-11)
USER MANUAL
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1 Introduction
Upstream
Downstream1
Downstream2
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 I
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 I
communication.
2.1 USB Ports
USB375x EVB - Evaluation Board User Manual
2
C communication pins.
2
C header exposing the I2C pins, and additional circuitry that is used for proper I2C
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.
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.
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USB375x EVB - Evaluation Board User Manual
TP1
TP2
TP3, LED4
J6
Ω
RPU
Vcc
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.
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 I
selected for 1MHz operation. The current Aardvark speed is at a very slow clock speed.
Figure 2.3 Vcc Regulator and I
2
C pullups are10k , but a smaller value may need to be
2
C Pull-up Resistors
SMSC USB375x EVB 3 Revision 1.1 (08-29-11)
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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.
USB375x EVB - Evaluation Board User Manual
Figure 3.1 Charger Detect with No Connection and SDP Connection
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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 Revision 1.1 (08-29-11)
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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.
2
Figure 3.3 I
C Register Access
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USB375x EVB - Evaluation Board User Manual
5
5
4
4
3
3
2
2
1
1
USB3750 16-pin QFN Evaluation Board
DNPDNPDNPDNP
DNP
I2C Interface
VCC_I2C Regulator
R21 = 78.7K VCC_I2C = 1.8 V
R21 = 107 K VCC_I2C = 2.0 V
R21 = 178K VCC_I2C = 2.5 V
R21 = 243K VCC_I2C = 3.0 V
R21 = 287K VCC_I2C = 3.3 V
DNP DNP
SCL
VBUS
DP1
DP2
DM2
DM1
DM
DP
DP
DM1
DM
DP2
DM2
DP1
VOUT
SCL
SDA
INT_B
SDA
INT_B
VBUS
VOUT
VOUT
VOUT
+5.0V
+5.0V
VCC_I2C
VCC_I2C
Title
Size Document Number Rev
Date: Sheet
of
3930 East Ray Road
Suite 200
Phoenix, Arizona 85044
480-759-0200
SCH-7230AZ-C00
PCB7230: USB3750 Evaluation Board
B
11Wednesday, August 24, 2011
Title
Size Document Number Rev
Date: Sheet
of
3930 East Ray Road
Suite 200
Phoenix, Arizona 85044
480-759-0200
SCH-7230AZ-C00
PCB7230: USB3750 Evaluation Board
B
11Wednesday, August 24, 2011
Title
Size Document Number Rev
Date: Sheet
of
3930 East Ray Road
Suite 200
Phoenix, Arizona 85044
480-759-0200
SCH-7230AZ-C00
PCB7230: USB3750 Evaluation Board
B
11Wednesday, August 24, 2011
P4
USB MICRO-AB
P4
USB MICRO-AB
VBUS1D-2D+3ID4GND5SHLD16SHLD27SHLD38SHLD49SHLD510SHLD6
11
TP3
VOUT
RED
TP3
VOUT
RED
R12
10.0k
R12
10.0k
C2
4.7uFC24.7uF
R61MR6
1M
U1
USB3750U1USB3750
DP_11VBUS2VBUS3VBUS
4
SDA
5
SCL
6
INT_B
7
GND
8
VOUT9VOUT10VOUT
11
DM_2
12
DP_2
13
DM
14
DP
15
DM_1
16
Flag
17
R/ANGLE USB A CON
P1
USB-A
R/ANGLE USB A CON
P1
USB-A
VCC1D-2D+3SHLD1
5
GND4SHLD2
6
C3
1.0uFC31.0uF
TP1
GND
Black
TP1
GND
Black
C4
10uF
6.3VC410uF
6.3V
R19
1.00k
R19
1.00k
R11MR1
1M
R22
169k
R22
169k
R31MR3
1M
R21
287k
R21
287k
R/ANGLE USB A CON
P3
USB-A
R/ANGLE USB A CON
P3
USB-A
VCC1D-2D+3SHLD1
5
GND4SHLD2
6
R51MR5
1M
U2
TPS77001DVBT
U2
TPS77001DVBT
Vout
5
FB
4
/EN3GND2Vin
1
R10
10.0k
R10
10.0k
P2
USB mini AB SMD
P2
USB mini AB SMD
VBUS1D+3D-2ID4GND5SHIELD16SHIELD27SHIELD38SHIELD4
9
J6
HDR_2x5J6HDR_2x5
1
3 425 6
7 8
9 10
R7 ZEROR7 ZERO
R14 ZEROR14 ZERO
R11
10.0k
R11
10.0k
R20
ZERO
R20
ZERO
TP2
VOUT
YELLOW
TP2
VOUT
YELLOW
LED4
Blue
LED4
Blue
12
R21MR2
1M
R41MR4
1M
C1
1.0uF
50VC11.0uF
50V
R13
ZERO
1/10W
R13
ZERO
1/10W
4 USB375x EVB Schematic
SMSC USB375x EVB 7 Revision 1.1 (08-29-11)
Figure 4.1 USB375x EVB Schematic
USER MANUAL
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5 USB375x EVB Bill of Materials
Item # Quantity Part Referenc
e
Description Digikey_Numbe
r
Manuf Manuf_PN RoHS DNP
1 1 C1 CAPACITOR CERAMIC 1.0UF 50V Y5V 0805 445-1364-1-ND TDK C2012Y5V1H105Z Yes
2 2 C2 C4 CAPACITOR CERAMIC 10UF 6.3VDC 20% X5R 08 PCC2225CT-ND PANASONIC ECJ-2FB0J106M Yes
3 1 C3 CAPACITOR CERAMIC 1.0UF 6.3V 20% X5R 040 490-1319-1-ND MURATA ERIE GRM155R60J105ME19D Yes
5 1 J6 HEADER, 2 X 5, 0.1 INCH, VERTICAL SAM1030-05-ND SAMTEC TSW-105-07-L-D Yes
6 1 LED4 LED GREEN SMT 404-1005-1-ND STANLEY BG1111C-TR Yes
7 2 P1 P3 RECEPTACLE, USB, STYLE B, RIGHT ANGLE 609-1045-ND FCI 87520-0010BLF Yes
8 0 P2 CONNECTOR RECEPT USB MINI AB 5POS RT ANG WM17122CT-ND MOLEX 56579-0576 YesP29 1 P4 CONNECTOR RECEPT MICRO USB TYPE AB SMT A97799CT-ND TYCO ELECTRONICS 1981584-1 Yes
10 3 R1 R2 R3 R4 R5 R6 RESISTOR 1MEG OHM 1/10W 5% 0603 311-1.0MGRCT-ND YAGEO RC0603JR-071ML Yes
R1 R2 R3 R4 R5 R6
11 10
R7 R8 R9 R13 R14 R15
R16 R17 R18 R20
RESISTOR ZERO OHM 1/10W 5% 0603 311-0.0GRCT-ND YAGEO RC0603JR-070RL Yes
12 3 R10 R11 R12 RESISTOR 10.0K OHM 1/10W 1% 0603 311-10.0KHRCT-ND YAGEO RC0603FR-0710KL Yes
13 2 R21 R22 RESISTOR 78.7K OHM 1/16W 1% 0402 SMD 541-78.7KLCT-ND VISHAY-DALE CRCW040278K7FKED Yes
14 1 R23 RESISTOR 470 OHM 1% 1/10W 0603 311-470GRCT-ND YAGEO RC0603JR-07470RL Yes
15 1 TP1 TEST POINT LOOP COMPACT BLACK 5006K-ND KEYSTONE 5006 Yes
16 1 TP2 TEST POINT 5015KCT-ND KEYSTONE 5015 Yes
17 1 TP3 TEST POINT LOOP COMPACT YELLOW 5009K-ND KEYSTONE 5009 Yes
18 1 U1 USB3750 SMSC USB3750 Yes
19 1 U2 IC ADJ 50MA LDO REG SOT-23-5 296-2762-1-N
D
TEXAS INSTRUMENTS TPS77001DBVT Yes
USB375x EVB - Evaluation Board User Manual
Figure 5.1 USB375x EVB Bill of Materials
Revision 1.1 (08-29-11) 8 SMSC USB375x EVB
USER MANUAL
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