19-4944; Rev 0; 9/09
MAX14550E Evaluation Kit
General Description
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
Features
Evaluates: MAX14550E
Ordering Information
PART
TYPE
MAX14550EEVKIT+
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
C1, C3, C4,
C6–C9
QTY
7
DESCRIPTION
0.1FF
Q10%,
16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
10FF
Q20%,
6.3V X5R ceramic
capacitors (0603)
Murata GRM188R60J106M
Green LEDs (0603)
3-pin headers
2-pin headers
Not installed, 2-pin header
USB type-A, right-angle
PC-mount receptacle
USB type-B, right-angle
PC-mount receptacle
Not installed, resistors (0603)
75kI
Q1%
resistor (0603)
—
—
—
—
*EP
= Exposed pad.
1
1
6
1
U1
1
DESIGNATION
R4, R6
R5
R7, R8
R9, R10
TP1, TP3, TP5
TP2, TP4, TP6
TP7, TP8, TP9
QTY
2
1
2
2
3
3
0
DESCRIPTION
49.9kI
Q1%
resistors (0603)
43.2kI
Q1%
resistor (0603)
0I
Q5%
resistors (0603)
470I
Q5%
resistors (0603)
Red multipurpose test points
Black multipurpose test points
Not installed, miniature test
points
Host USB charger switch
(10 TDFN-EP*)
Maxim MAX14550EETB+
USB high-speed A-to-B cables,
5ft
USB A-to-micro-B cable, 1m
Shunts
PCB: MAX14550E EVALUATION
KIT+
C2, C5, C10
D1, D2
JU1, JU2, JU5,
JU6
JU3, JU4
JU7
P1
P2
R1, R2
R3
3
2
4
2
0
1
1
0
1
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.
MAX14550E Evaluation Kit
Evaluates: MAX14550E
Quick Start
• MAX14550E EV kit
• 5V, 10mA power supply
• Digital multimeter (DMM)
The MAX14550E EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
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.
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).
Required Equipment
4) Set the shunt on JU5 to the 2-3 position (CB0 = 0,
CB1 =1).
5) Under this setting, DP and DM are shorted to each
other. Measure the resistance across JU7. A resis-
tance less than 100I represents a short between DP
and DM.
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).
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.
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.
Procedure
Table 1. MAX14550E EV Kit Jumper Description (JU1–JU6)
JUMPER
SHUNT
POSITION
1-2*
2-3
1-2*
JU2
2-3
Open*
Closed
Open
Closed*
1-2*
2-3
1-2*
2-3
DESCRIPTION
Connects VCC to +5V from VBUS on P2. When the USB cable is plugged into the PC, VBUS volt-
age appears on TP1.
Connects VCC to TP3 (EXTVCC). Apply an external 5V supply between TP3 and TP4.
Selects VCC as charging source for P1
Selects TP5 (EXTCHG) as the charging source for P1. Apply the external 5V supply between TP5
and TP6.
External voltage-divider is used
Internal voltage-divider is used
RDM test point
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)
JU1
JU3
JU4
JU5
JU6
*Default
position.
2
______________________________________________________________________________________
MAX14550E Evaluation Kit
Evaluates: MAX14550E
Detailed Description of Hardware
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 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.
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). Auto-
detection chooses one of these two states depending on
the voltage on DM.
Control Settings for CB0 and CB1
(JU5, JU6)
Table 2. Digital Inputs States
CB0
0
0
1
1
CB1
0
1
0
1
DP/DM
Autodetection circuit
active
Shorted together
Connected to resistor-
dividers
Connected to TDP/TDM
COMMENT
—
Auto mode disabled
Auto mode disabled
USB traffic active
INTERNAL RESISTOR-DIVIDER STATE IF NO
EXTERNAL DIVIDER IS PRESENT
Connected
Not connected
Connected
Not connected
_______________________________________________________________________________________
3
MAX14550E Evaluation Kit
Evaluates: MAX14550E
Figure 1. MAX14550E EV Kit Schematic
4
______________________________________________________________________________________
MAX14550E Evaluation Kit
Evaluates: MAX14550E
1.0’’
1.0’’
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
京公网安备 11010802033920号
EEWORLD
