MAX14550EEVKIT [MAXIM]
Test Points for Easy Evaluation;
| 型号： | MAX14550EEVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Test Points for Easy Evaluation |
| 文件： | 总6页 (文件大小：1008K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4944; Rev 0; 9/09
MAX14550E Evaluation Kit
General Description
Features
The MAX14550E evaluation kit (EV kit) provides a proven
design to evaluate the MAX14550E USB host charger
identification analog switch. The Hi-Speed USB transmis-
sion lines (D+ and D-) have 90I differential impedance
traces to meet Hi-Speed USB specs. The MAX14550E
EV kit comes with a MAX14550EETB+ installed.
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
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
R4, R6
R5
2
1
2
2
3
3
49.9kI Q1% resistors (0603)
43.2kI Q1% resistor (0603)
0I Q5% resistors (0603)
0.1FF Q10%, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
C1, C3, C4,
C6–C9
7
R7, R8
R9, R10
470I Q5% resistors (0603)
Red multipurpose test points
Black multipurpose test points
10FF Q20%, 6.3V X5R ceramic
capacitors (0603)
Murata GRM188R60J106M
C2, C5, C10
D1, D2
3
TP1, TP3, TP5
TP2, TP4, TP6
2
4
Green LEDs (0603)
3-pin headers
Not installed, miniature test
points
TP7, TP8, TP9
0
1
1
JU1, JU2, JU5,
JU6
Host USB charger switch
(10 TDFN-EP*)
Maxim MAX14550EETB+
JU3, JU4
JU7
2
0
2-pin headers
U1
—
Not installed, 2-pin header
USB type-A, right-angle
PC-mount receptacle
USB high-speed A-to-B cables,
5ft
P1
P2
1
1
—
—
1
6
USB A-to-micro-B cable, 1m
Shunts
USB type-B, right-angle
PC-mount receptacle
R1, R2
R3
0
1
Not installed, resistors (0603)
PCB: MAX14550E EVALUATION
KIT+
—
1
75kI Q1% resistor (0603)
*EP = Exposed pad.
Component Supplier
SUPPLIER
PHONE
770-436-1300
WEBSITE
Murata Electronics North America
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.
MAX14550E Evaluation Kit
4) Set the shunt on JU5 to the 2-3 position (CB0 = 0,
Quick Start
Required Equipment
CB1 =1).
5) Under this setting, DP and DM are shorted to each
other. Measure the resistance across JU7. A resis-
tance less than 100Irepresents a short between DP
and DM.
• MAX14550E EV kit
• 5V, 10mA power supply
• Digital multimeter (DMM)
6) Set the shunt on JU5 to the 1-2 position and set the
shunt on JU6 to the 2-3 position (CB0 = 1, CB1 = 0).
Procedure
The MAX14550E EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
7) Under 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.
1) Verify that all jumpers (JU1–JU6) are in their default
positions, as shown in Table 1.
2) Connect 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.
8) Change 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.
3) Set the DMM as an ohmmeter and verify that the con-
nection 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).
Table 1. MAX14550E EV Kit Jumper Description (JU1–JU6)
SHUNT
POSITION
JUMPER
DESCRIPTION
Connects VCC to +5V from VBUS on P2. When the USB cable is plugged into the PC, VBUS volt-
age appears on TP1.
1-2*
JU1
2-3
Connects VCC to TP3 (EXTVCC). Apply an external 5V supply between TP3 and TP4.
Selects VCC as charging source for P1
1-2*
JU2
Selects TP5 (EXTCHG) as the charging source for P1. Apply the external 5V supply between TP5
and TP6.
2-3
Open*
Closed
Open
Closed*
1-2*
External voltage-divider is used
Internal voltage-divider is used
RDM test point
JU3
JU4
JU5
JU6
Normal operation
CB0 is connected to VCC (CB0 = 1)
CB0 is connected to GND (CB0 = 0)
CB1 is connected to VCC (CB1 = 1)
CB1 is connected to GND (CB1 = 0)
2-3
1-2*
2-3
*Default position.
2
______________________________________________________________________________________
MAX14550E Evaluation Kit
Control Settings for CB0 and CB1
Detailed Description of Hardware
(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.
The MAX14550E EV kit provides a proven layout to
evaluate the MAX14550E USB host charger identification
analog switch. The D+ and D- lines have 90Idifferential
impedance to meet USB 2.0 signal-integrity specifica-
tions. 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 charg-
ing 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.
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). Auto-
detection chooses one of these two states depending on
the voltage on DM.
Table 2. Digital Inputs States
INTERNAL RESISTOR-DIVIDER STATE IF NO
EXTERNAL DIVIDER IS PRESENT
CB0
CB1
DP/DM
COMMENT
Autodetection circuit
active
0
0
1
1
0
1
0
1
—
Connected
Shorted together
Auto mode disabled
Auto mode disabled
USB traffic active
Not connected
Connected
Connected to resistor-
dividers
Connected to TDP/TDM
Not connected
_______________________________________________________________________________________
3
MAX14550E Evaluation Kit
Figure 1. MAX14550E EV Kit Schematic
4
______________________________________________________________________________________
MAX14550E Evaluation Kit
1.0’’
1.0’’
Figure 3. MAX14550E EV Kit PCB Layout—Component Side
Figure 2. MAX14550E EV Kit Component Placement Guide—
Component Side
1.0’’
Figure 4. MAX14550E EV Kit PCB Layout—GND Layer 2
_______________________________________________________________________________________
5
MAX14550E Evaluation Kit
1.0’’
1.0’’
Figure 6. MAX14550E EV Kit PCB Layout—Solder Side
Figure 5. MAX14550E EV Kit PCB Layout—VCC Layer 3
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
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
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