MAXIM MAX14550E User Manual

19-4745; Rev 2; 1/10

EVALUATION KIT

AVAILABLE

USB Host Charger Identification Analog Switch

General Description

The MAX14550E is a USB Hi-Speed analog switch with a USB host charger (dedicated charger) identification circuit. The MAX14550E supports both the USB Battery Charging Specification Revision 1.0 and a set resistor bias for AppleM-compliant devices.

The MAX14550E features a high-performance Hi-Speed USB switch with low 4pF (typ) on-capacitance and low 4I (typ) on-resistance. In addition, the MAX14550E features two digital inputs (CB0 and CB1) to switch between pass-through and charger modes. The USB host charger identification circuit allows a host USB port to support USB chargers with shorted D+/D- detection and to provide support for Apple-compliant devices using a resistor bias. When an Apple-compliant device is attached to the port, the MAX14550E provides the voltage from the resistor-divider. The MAX14550E uses the internal or external resistor based on the voltage at RDP. If a USB Revision 1.0-compliant device is attached, the MAX14550E connects a short across DP and DM to allow correct charger detection. The MAX14550E autodetection circuit can be disabled and either a DP/DM short or resistor network is chosen as the default.

The MAX14550E has enhanced high electrostatic discharge (ESD) protection on the DP and DM inputs up to Q15kV Human Body Model (HBM).

The MAX14550E is available in a 10-pin (3mm x 3mm) TDFN package and is specified over the -40NC to +85NC extended temperature range.

Features

S USB 2.0 Hi-Speed Switching

S Low 4.0pF On-Capacitance

S Low 4.0ω On-Resistance

S Ultra-Low 0.1ω On-Resistance Flatness

S +2.8V to +5.5V Supply Range

S Ultra-Low 7µA Supply Current

S Automatic USB Charger Identification Circuit

S Optional External Resistor-Divider with Auto

Selection

S ±15kV High ESD HBM Protection on DP/DM

S 3mm x 3mm, 10-Pin TDFN Package

Applications

Laptops

Netbooks

Cell Phones

Ordering Information

PART TEMP RANGE

MAX14550EETB+

+Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad.

-40NC to +85NC

PIN-

PACKAGE

10 TDFN-EP* AWG

TOP

MARK

MAX14550E

Typical Operating Circuit appears at end of data sheet.

Apple is a registered trademark of Apple, Inc.

_______________________________________________________________ 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.

USB Host Charger Identification Analog Switch

ABSOLUTE MAXIMUM RATINGS

VCC, DP, DM, TDP, TDM, RDP,

RDM, CB_ to GND ...............................................-0.3V to +6V

Continuous Current Into Any Terminal ........................... Q30mA

Continuous Power Dissipation (TA = +70NC)

10-Pin TDFN (derate 24.4mW/NC above +70NC) .......1951mW

Thermal Resistance (Note 1)

Junction-to-Ambient Thermal Resistance (BJA) ...........41NC/W

Junction-to-Case Thermal Resistance (BJC) ..................9NC/W

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

MAX14550E

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.

ELECTRICAL CHARACTERISTICS

(VCC = +2.8V to +5.5V, TA = TJ = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25NC, unless otherwise noted.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Power-Supply Voltage V

Supply Current I

Supply Current Increase Analog Signal Range VDP, V

ANALOG SWITCH

On-Resistance TDP/TDM Switch

On-Resistance Match Between Channels TDP/TDM Switch

R

DR

DI

CC

ONT

VCC = 3.3V

VCC = 5.5V

0V P V

DM

0V P V

P VIL or VIH P V

CB_

P VCC, I

DP/DM

VDP = VDM = 400mV, IDP or IDM = 10mA 0.1

Operating Temperature Range .......................... -40NC to +85NC

Maximum Junction Temperature .....................................+150NC

Storage Temperature Range ............................ -65NC to +150NC

Soldering Temperature (Reflow) .......................................260NC

2.8 5.5 V

V

= VCB = V

CB0

V

= 0V, VCB = V

CB0

CC

0.7 2

6.5 10

External resistors used, V

= VCB = 0V or

CB0

V

= VCC, VCB = 0V

CB0

7 12

Internal resistors used, V

= VCB = 0V or

CB0

V

= VCC, VCB = 0V

CB0

V

= VCB = V

CB0

V

= 0V, VCB = V

CB0

CC

76 120

2.5 7

8.5 15

External resistors used, V

= VCB = 0V or

CB0

V

= VCC, VCB = 0V

CB0

9 16

Internal resistors used, V

= VCB = 0V or

CB0

V

= VCC, VCB = 0V

CB0

or IDM = 10mA

DP

CB_

P V

CC

0 V

125 180

2

CC

4 6.5

FA

V

I

2

USB Host Charger Identification Analog Switch

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +2.8V to +5.5V, TA = TJ = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25NC, unless otherwise noted.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

On-Resistance Flatness TDP/ TDM Switch

On-Resistance RDP/RDM Switch

On-Resistance Flatness RDP/ RDM Switch

On-Resistance of DP/DM Short

R

FLATT

R

ONR

R

FLATR

R

SHORT

VDP = VDM, 0V P VDP P VCC, IDP = IDM = 10mA

0.4V P V

RDP/RDM

P VCC, I

RDP

= I

10mA

V

= V

RDP

I

= I

RDP

V

= 0V, VCB = VCC, VDP = VDM,

CB0

RDM

, 0.4V P V

= 10mA

RDP

P VCC,

0V P VDP P VCC, IDP = IDM = 1mA

RDM

=

0.1

4 7.5

0.1

50 70

I

MAX14550E

TDP/TDM Off-Leakage Current

DP/DM On-Leakage Current

I

TDPOFF

I

TDMOFF

I

DPON

I

DMON

DYNAMIC PERFORMANCE

Turn-On Time t

Turn-Off Time t

TDP/TDM Switch Propagation Delay

Output Skew Between Switches

TDP/TDM Off-Capacitance C

DP/DM On-Capacitance (Connected to TD_ )

t

PLH

ON

OFF

, t

t

SK(O)

OFF

C

ON

-3dB Bandwidth BW

Off-Isolation V

Crosstalk V

ISO

CT

INTERNAL RESISTORS

DP/DM Short Pulldown R

PD

RP1/RP2 Ratio RT RP1 + RP2 Resistance R

RP

RM1/RM2 Ratio RT RM1 + RM2 Resistance R

RM

RP

RM

,

VCC = 5.5V, V VDM = 5.5V to 0V, V

,

VCC = 5.5V, V

= VCC, VCB = 0V, VDP =

CB0

= V

TDP

TDM

= VCB = VCC,

CB0

VDP = VDM = 5.5V to 0V

V

TDP

or V

= 1.5V, RL = 300I,

TDM

CL = 35pF, VIH = VCC, VIL = 0V, Figure 1

V

TDP

or V

= 1.5V, RL = 300I,

TDM

CL = 35pF, VIH = VCC, VIL = 0V, Figure 1

RL = RS = 50I

PHL

Skew between DP and DM when connected to TDP and TDM, RL = RS = 50I, Figure 2

f = 1MHz, V

BIAS

= 0V, V

SIGNAL

(Note 3)

f = 240MHz, V V

SIGNAL

= 500mV

BIAS

= 0V,

P-P

RL = RS = 50I

V

, VDP = 0dBm, RL = RS = 50I,

TDP

f = 250MHz, Figure 3

V

, VDP = 0dBm, RL = RS = 50I,

TDP

f = 250MHz, Figure 3

= 0V to 5.5V

= 500mV

P-P

-250 +250 nA

20 100

2.5 5

Fs

60 ps

40 ps

2.0 pF

4.0 5.5 pF

1000 MHz

-20 dB

-25 dB

350 500 700

kI

1.485 1.5 1.515 Ratio

93.75 125 156.25

kI

0.854 0.863 0.872 Ratio

69.75 93 116.25

kI

3

USB Host Charger Identification Analog Switch

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +2.8V to +5.5V, TA = TJ = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25NC, unless otherwise noted.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

COMPARATORS

V

> 0.4V, DM falling 1.9 2.1 2.3 V

DM Comparator Threshold V

DP and RDP Comparator Threshold

MAX14550E

DM Comparator Hysteresis 1 %V

V

DMF

DPR

DP and RDP Comparator Hysteresis

DM Comparator Debounce Time

DP Comparator Debounce Time

t

DM

t

DP

DIGITAL I/O (CB0, CB1)

Input Logic Voltage High V Input Logic Voltage Low V Input Logic Hysteresis V

Input Leakage Current I

IH

IL

HYST

IN

ESD PROTECTION

All Pins Human Body Model

ESD Protection Level (DP and DM Only)

RDP

V

< 0.3V, DM falling 44 45 46 %V

RDP

DP or RDP falling 0.3 0.35 0.4 V

1 %V

VDM from 2.8V to 1.5V 30 100 200

VDP from 0.7V to 0V 30 100 200

1.4 V

0.4 V

100 mV

VCC = 5.5V, 0V P V VIH P V

CB_

P V

CC

Human Body Model

CB_

P VIL or

-250 +250 nA

Q2

Q15

kV

Fs

CC

DMF

DPR

Note 2: All devices are 100% production tested at TA = +25NC. Specifications over temperature are guaranteed by design. Note 3: Guaranteed by design.

Test Circuits/Timing Diagrams

V

CC

tR < 5ns t

< 5ns

F

t

OFF

0.9 x V

OUT

TD_

V

IN

CB0

LOGIC INPUT

C

INCLUDES FIXTURE AND STRAY CAPACITANCE.

L

V

OUT

R

Figure 1. Switching Time

4

= V

GND

IN (

R

L

CB1

+ R

V

MAX14550E

L

)

ON

V

CC

D_

R

L

V

OUT

C

L

LOGIC INPUT

SWITCH OUTPUT

IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH.

IH

V

IL

0V

50%

V

OUT

0.9 x V

0UT

t

ON

USB Host Charger Identification Analog Switch

Test Circuits/Timing Diagrams (continued)

MAX14550E

IN+

R

S

R

IN-

S

MAX14550E

TDP

TDM

DP

C

L

DM

C

L

V

CC

RISE TIME DELAY = |t FALL TIME DELAY = |t RISE TIME TO FALL TIME MISMATCH = |t

OUT+

OUT-

INRISE

INFALL

- t

OUTRISE

OUTFALL

|

OUTFALL

- t

OUTRISE

|

CB0 CB1

V

CC

t

INFALL

V

CC

V

IN+

0V

V

CC

V

IN-

0V

50%

90%

10%

t

OUTFALL

t

INRISE

10%

t

OUTRISE

90%

V

CC

V

OUT+

0V

V

CC

V

OUT-

0V

Figure 2. Output Signal Skew

t

SK(0)

50%

90%

10%

90%

10%

5

USB Host Charger Identification Analog Switch

TDP/TDM ON-RESISTANCE

Test Circuits/Timing Diagrams (continued)

V

OUT

V

IN

V

OUT

V

IN

0V OR V

CC

CB1

CB0 V

MAX14550E

V

CC

TDP

DP*

V

IN

V

OUT

MEAS REF

NETWORK

ANALYZER

50I

50I 50I

50I

OFF-ISOLATION = 20log

CROSSTALK = 20log

SWITCH IS ENABLED. MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN TD_ AND "OFF" D_ TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED FROM ONE CHANNEL TO THE OTHER CHANNEL. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.

*FOR CROSSTALK, THIS PIN IS DM. TDM AND DP ARE OPEN.

Figure 3. Off-Isolation and Crosstalk

Typical Operating Characteristics

(T

= +25°C, unless otherwise noted.)

A

RDP/RDM ON-RESISTANCE

4.5

4.0

3.5

3.0

2.5

(I)

ON

R

2.0

1.5

1.0

0.5

0

0 5.5

VCC = 2.8V

vs. SUPPLY VOLTAGE

TDP/TDM ON-RESISTANCE vs. V

5.0

4.5

4.0

MAX14550E toc01

3.5

3.0

(I)

2.5

ON

VCC = 5.5V

5.04.53.5 4.01.0 1.5 2.0 2.5 3.00.5

V

(V)

TDP

R

2.0

1.5

1.0

0.5

0

0 3.3

TA = +85°C

TA = +25°C

TA = -40°C

V

TDP/TDM

(V)

TDP/TDM

VCC = 3.3V

5.0

4.5

4.0

MAX14550E toc02

3.5

3.0

(I)

2.5

ON

R

2.0

1.5

1.0

0.5

3.02.72.1 2.40.6 0.9 1.2 1.5 1.80.3

0

vs. SUPPLY VOLTAGE

VCC = 2.8V

VCC = 5.5V

V

(V)

RDP

5.55.04.0 4.51.0 1.5 2.0 2.5 3.0 3.50.50 6.0

MAX14550E toc03

6

USB Host Charger Identification Analog Switch

Typical Operating Characteristics (continued)

(T

= +25°C, unless otherwise noted.)

A

MAX14550E

RDP/RDM ON-RESISTANCE vs. V

6

5

V

RDP/RDM

TA = +85°C

TA = +25°C

TA = -40°C

(V)

4

(I)

3

ON

R

2

1

0

0 3.5

SUPPLY CURRENT

vs. LOGIC LEVEL

250

200

150

(µA)

CC

I

100

50

0

0 3.3

INTERNAL RESISTOR-

DIVIDER

EXTERNAL RESISTOR-

DIVIDER

LOGIC LEVEL (V)

RDP/RDM

VCC = 3.3V

3.02.52.01.51.00.5

TDP/DP LEAKAGE CURRENT

vs. TEMPERATURE

MAX14550E toc05

(µA) I

10

9

8

7

6

5

CC

4

3

2

1

0

2.8 5.5

100

90

80

MAX14550E toc04

70

60

50

40

30

LEAKAGE CURRENT (nA)

20

10

0

ON-LEAKAGE

OFF-LEAKAGE

-45 90 TEMPERATURE (°C)

756030 45-15 0 15-30

TURN-ON/TURN-OFF TIME

vs. SUPPLY VOLTAGE

16

14

MAX14550E toc07

12

10

8

6

4

TURN-ON/TURN-OFF TIME (µs)

2

3.02.72.42.11.81.51.20.90.60.3

0

t

ON

t

OFF

2.0 6.0

VCC (V)

5.55.02.5 3.0 3.5 4.0 4.5

1.2

1.1

MAX14550E toc08

1.0

0.9

0.8

0.7

0.6

LOGIC-INPUT THRESHOLD (V)

0.5

0.4

2.8 5.5

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

TA = +85°C

TA = +25°C

TA = -40°C

VCC (V)

LOGIC-INPUT THRESHOLD

vs. SUPPLY VOLTAGE

CB_ RISING

CB_ FALLING

VCC (V)

MAX14550E toc06

V

= V

CB0

CC

V

= 0V

CB1

V

= V

RDP

CC

5.24.94.3 4.63.4 3.7 4.03.1

MAX14550E toc09

5.24.93.1 3.4 3.7 4.34.0 4.6

0

FREQUENCY RESPONSE

-10

-20

-30 OFF-ISOLATION

-40

-50

MAGNITUDE (dB)

-60

-70

-80

1 1000

FREQUENCY (MHz)

ON-LOSS

CROSSTALK

10010

MAX14550E toc10

0.5

0.4

0.3

0.2

0.1

0.0

-0.1

-0.2

DIFFERENTIAL SIGNAL (V)

-0.3

-0.4

-0.5

0.0

EYE DIAGRAM

TIME (x 10n - 9)s

MAX14550E toc11

2.01.81.4 1.60.4 0.6 0.8 1.0 1.20.2

7

USB Host Charger Identification Analog Switch

Typical Operating Characteristics (continued)

(T

= +25°C, unless otherwise noted.)

A

AUTODETECTION MODE

MAX14550E toc12

DM 500mV/div

DP 500mV/div

DP RISING

VCC = 2.8V, RL = 300I, CL = 35pF

MAX14550E toc13

VCC = 4V, RL = 300I, CL = 35pF

DP RISING

MAX14550E toc14

MAX14550E

INTERNAL RESISTOR-

DIVIDERS ENABLED

100µs/div

Pin Configuration

0V

TOP VIEW

CB0

DM

GND

4µs/div

+

1

2 9

3

4

5 6

MAX14550E

*EP

CB1

10

TDPDP

TDM

8

V

7

CC

RDMRDP

4µs/div

TDFN

(3mm × 3mm)

*CONNECT EP TO GND.

Pin Description

PIN NAME FUNCTION

1 CB0 Switch Control Bit 0. See the Switch Control section. 2 DP USB Connector D+ Connection 3 DM USB Connector D- Connection 4 GND Ground 5 RDP External Resistor Bias Input for D+ and Selection for External Resistors in RDP and RDM 6 RDM External Resistor Bias Input for D7 V 8 TDM USB Transceiver D- Connection 9 TDP USB Transceiver D+ Connection

10 CB1 Switch Control Bit 1. See the Switch Control section.

— EP Exposed Pad. Connect EP to GND. Do not use EP as the main ground connection.

8

Power Supply. Bypass VCC to GND through a 0.1FF capacitor. Place the capacitor as close as possible to the device.

CC

USB Host Charger Identification Analog Switch

Functional Diagram

MAX14550E

RP1

RM1

V

CC

MAX14550E

2.1V

RDP

RDM

0.4V

GND

RP2

RM2

V

CC_SW

V

CC_SW

Detailed Description

The MAX14550E is a combination of a Hi-Speed USB analog switch and a charger host identification detection analog switch, which allows USB hosts to identify the USB port as a charger port when the USB host is in a low-power mode and cannot enumerate USB devices. The MAX14550E features a high-performance, Hi-Speed USB switch with low 4pF on-capacitance and low 4I onresistance. DP and DM can survive signals between 0V and 6V with any supply voltage.

Resistor-Dividers

The MAX14550E features an internal resistor-divider for biasing or can operate with external resistors. Connect RDP to ground to use the internal resistor-divider (see the Typical Operating Circuit). The user must provide 5V supply voltage to VCC when the internal resistor-divider is used. When the MAX14550E is not operated with the internal resistor-dividers, the device disconnects the internal resistor-dividers’ pullup voltage (V minimize supply current requirements.

CC_SW

) to

TDPTDM

DP

0.4V

R

Q

S

500kI

CONTROL

LOGIC

CBO CB1

ESD

PROTECTION

DM

Connect RDP to a voltage above 0.4V (max) to use external resistors (Figure 4). Internal resistor-dividers are always disconnected from the supply voltage when external resistor-dividers are detected at RDP (V

RDP

> 0.4V).

Switch Control

The MAX14550E features two digital inputs, CB0 and CB1, for mode selection (Table 1). Connect CB0 and CB1 to a logic-level low voltage for autodetection mode (see the Autodetection section).

Connect CB0 and CB1 to a logic-level high voltage for normal Hi-Speed USB bypass functionality.

Connect CB0 to a logic-level low and CB1 to a logic-level high voltage to select charger mode. Optionally, CB0 and CB1 can be forced to set the detection to a particular state. The USB Implementers Forum (USB-IF) has defined that dedicated chargers have D+ and D- shorted together. In USB charger mode, DP and DM are shorted together for dedicated charging functionality. Connect CB0 to a logic-level high and CB1 to a logic-level low voltage to force the resistor network to be connected to DP and DM.

9

USB Host Charger Identification Analog Switch

3.3V TO 5.0V

USB

0.1µF

TRANSCEIVER

D-

D+

CC

MAX14550E

2.1V

5.0V

75kI

MAX14550E

49.9kI

43.2kI

49.9kI

RDP

RDM

0.4V

RP2

RM2

V

CC_SW

V

CC_SW

RP1

RM1

Figure 4. Operation with External Resistors

Autodetection

The MAX14550E features autodetection mode for dedicated chargers and USB masters. CB0 and CB1 must both be set low to activate autodetection mode.

In autodetection mode, the MAX14550E initially connects the resistor network to DP and DM. The MAX14550E monitors the voltage at DM to determine the type of device attached. If the voltage at DM is 2.1V (typ) or higher, the voltage stays as is.

If the voltage at DM is below the 2.1V (typ) threshold, the internal switch disconnects DP from the resistor network and DM. DP and DM are shorted together. The MAX14550E then monitors the voltage at DM to determine when to reconnect the resistor network. If the volt-

TDMV

0.4V

R

Q

S

TDP

500kI

CBO CB1GND

CONTROL

LOGIC

ESD

PROTECTION

DP D+

DM

D-

CB0 AND CB1 00 - AUTO MODE 01 - FORCE SHORT 10 - FORCE RESISTOR 11 - TDP = DP, TDM = DM

USB

CONNECTOR

age at DM > 0.35V (typ), the short remains connected. If the voltage at DM drops below 0.35V (typ), the short is removed and the resistor network is reconnected to DP and DM.

DP and DM feature a 100Fs (typ) debounce time to reject transients.

ESD Test Conditions

ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results.

The Air-Gap test involves approaching the device with a charged probe. The Contact-Discharge method connects the probe to the device before the probe is energized.

10

USB Host Charger Identification Analog Switch

Table 1. Digital Input States

INTERNAL OR

V

CC

(V)

3.3 RDP < 0.4V X X — — Not recommended

3.3 RDP > 0.4V

5.0

< 0.4V = INTERNAL RESISTOR > 0.4V = EXTERNAL RESISTOR

RDP

RDP < 0.4V

RDP > 0.4V

CB0 CB1

0 0

0 1 Shorted Not connected

1 0

1 1

0 0

0 1 Shorted Not connected

1 0

1 1

0 0

0 1 Shorted Not connected

1 0

1 1

DP/DM

POSITION

Autodetection

circuit active

Connected to

resistor-divider

Connected to

TDP/TDM

Autodetection

circuit active

Connected to

resistor-divider

Connected to

TDP/TDM

Autodetection

circuit active

Connected to

resistor-divider

Connected to

TDP/TDM

EXTERNAL

RESISTOR

CONNECTED TO

DP/DM

External resistor Auto mode

External resistor

Not connected USB traffic active

Internal resistor Auto mode

Internal resistor

Not connected USB traffic active

External resistor Auto mode

External resistor

Not connected USB traffic active

COMMENT

Auto mode

disabled

Auto mode

disabled

Auto mode

disabled

Auto mode

disabled

Auto mode

disabled

Auto mode

disabled

MAX14550E

11

USB Host Charger Identification Analog Switch

Extended ESD Protection

(Human Body Model)

ESD-protection structures are incorporated on all pins to protect against electrostatic discharges up to Q2kV (Human Body Model) encountered during handling and

up to Q15kV (Human Body Model) without damage. The ESD structures withstand high ESD both in normal operation and when the device is powered down. After an ESD event, the device continues to function without latchup (Figures 5a and 5b).

assembly. DP and DM are further protected against ESD

Table 2. Tested Portable Device

MANUFACTURER/

SPECIFICATION

MAX14550E

Apple

Motorola

RIM BlackBerry®

HTC

USB-IF Standard — Shorted D+/D-

China Standard — Shorted D+/D- Method not defined Depends on model

DEVICE IDENTIFICATION DETECTION METHOD/COMMENTS

iPod® and some

iPhones®

iPod touch®

and iPhone 3G

All phones with

mini-USB

QUALCOMM®-

based phones

None

Resistor-divider on

D+ and D-

Resistor to GND on

ID line

Some models look for

shorted D+/D-

None

Immediately draws 500mA when 5V is attached to V

USB FS/HS configuration: draws < 500mA D+/D- voltage detection: <1A

USB FS/HS configuration: draws < 500mA. Follows CEA-936-A specification, which is the only known company to use this specification.

USB FS/HS configuration: draws < 500mA. Some models look for shorted D+/D- with a pullup to 2.7V for dedicated charger.

Immediately draws 500mA when 5V is attached to V

Device uses a specific method (voltages and timing well defined)

BUS

MAX14550E

SUPPORT

iPhone 2G, 3G, and

3GS; iPod classic®;

iPod video; iPod

touch (1st and 2nd

generations);

iPod nano® (3rd,

4th, 5th generation);

and iPod mini

Depends on model

Full support

2009 and newer

LG and Samsung

models with micro-

USB connector

iPod, iPhone, iPod touch, iPod classic, and iPod nano are registered trademarks of Apple, Inc. BlackBerry is a registered trademark/servicemark of Research In Motion Limited. QUALCOMM is a registered trademark of QUALCOMM Incorporated.

12

USB Host Charger Identification Analog Switch

R

D

1500Ω

DISCHARGE

RESISTANCE

STORAGE CAPACITOR

DEVICE UNDER

TEST

AMPERES

IP 100%

90%

36.8%

10%

PEAK-TO-PEAK RINGING

I

r

(NOT DRAWN TO SCALE)

0

t

RL

TIME

t

DL

CURRENT WAVEFORM

HIGH-

VOLTAGE

DC

SOURCE

R

C

1MΩ

CHARGE-CURRENT

LIMIT RESISTOR

C

100pF

S

MAX14550E

Figure 5a. Human Body ESD Test Model

Figure 5b. Human Body Current Waveform

Timing Charts

V

BUS

HOST

SW

iPod ATTACH IN S0

USB CONNECTION

CHARGING CURRENT

V

BUS

HOST

SW

S0 S0 S0S3 S3

PT PT PTAT

S3 S3 S3S0 S0 S0

5V

ATTACH

≤ 500mA ≤ 500mA

5V

PT PT PTATAT AT

≤ 100mA

AT

ATTACHDETACH

≤ 500mA ≤ 1000mA

≤ 100mA

iPod ATTACH IN S3

USB CONNECTION

CHARGING CURRENT

NOTE: WHEN USING THIS TIMING, IT IS RECOMMENDED TO SUPPLY V

ATTACH

≤ 1000mA ≤ 1000mA ≤ 1000mA ≤ 500mA≤ 500mA

CC

WITH V

BUS

, AND V

SHOULD BE IMMEDIATELY DISCHARGED WHEN V

BUS

≤ 100mA

IS TURNED OFF.

BUS

13

USB Host Charger Identification Analog Switch

Timing Charts (continued)

S0 TO S3 TRANSITION

V

BUS

HOST

S0 S0S3 S3

SW

PT PTAT AT

MAX14550E

iPod ATTACH IN S3

USB CONNECTION

CHARGING CURRENT

5V 5V

V

BUS

HOST

5V

ATTACH

≤ 1000mA ≤ 1000mA≤ 500mA ≤ 500mA

4.0V

0.8V 0.8V

> 0.5s

< 3s

S3S0

< 1ms

14

SW

USB Host Charger Identification Analog Switch

Timing Charts (continued)

S3 TO S0 TRANSITION

MAX14550E

V

BUS

HOST

iPod ATTACH IN S3

USB CONNECTION

CHARGING CURRENT

5V 5V

V

BUS

HOST

SW

S0 S0S3 S3

PT PTAT AT

SW

S3

t

FALL TO 4.0V

t

AT TO PT

5V

ATTACH

≤ 1000mA ≤ 1000mA≤ 500mA ≤ 500mA

4.0V

0.8V 0.8V

>0.5s

<3s

S0

t

< t

AT TO PT

FALL TO 4.0V

PTAT

4.0V

NOTE: THIS TIMING IS TO AVOID THE VOLTAGE FROM THE RESISTOR-DIVIDER FROM APPEARING ON DP/DM WHILE V GROUNDED BY 15kΩ.

IS OFF BY SWITCHING DP/DM TO TDP/TDM, WHICH IS

BUS

15

USB Host Charger Identification Analog Switch

Typical Operating Circuit

5.0V

USB

0.1µF

TRANSCEIVER

D-

D+

MAX14550E

RP2

RDP

RM2

RDM

0.4V

GND

V

CC_SW

V

CC_SW

RP1

RM1

CC

MAX14550E

2.1V

TDMV

0.4V

R

Q

S

TDP

500kI

CONTROL

LOGIC

CBO CB1

MICROCONTROLLER

DP D+

ESD

PROTECTION

DM

D-

LOW = AUTO MODE (LAPTOP IN SLEEP/STANDBY)

HIGH = TDP = DP, TDM = DM (LAPTOP AWAKE - USB ACTIVE)

USB

CONNECTOR

Chip Information

PROCESS: BiCMOS

Package Information

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.

PACKAGE TYPE PACKAGE CODE DOCUMENT NO.

10 TDFN-EP T1033+1

16

21-0137

USB Host Charger Identification Analog Switch

Revision History

MAX14550E

REVISION

NUMBER

0 8/09 Initial release. —

1 11/09

2 1/10 Replaced the timing diagrams in Timing Charts. 13, 14,15

REVISION

DATE

DESCRIPTION

• Replaced the Lead Temperature with Soldering Temperature in the Absolute Maximum Ratings section.

• Changed the “DP/DM On-Capacitance” specification in the Electrical Characteristics table conditions from f = 1MHz to f = 240MHz and 6.0pF (max) to 5.5pF (max).

• Replaced TOC11 (Eye Diagram) in the Typical Operating Characteristics section.

• Replaced Table 1 and added Table 2.

• Added the Timing Chart.

PAGES

CHANGED

2, 3, 7, 11,

12, 13

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.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 17

©

2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

MAXIM MAX14550E User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual