MAX3355EEUD Maxim Integrated Products, MAX3355EEUD Datasheet - Page 7

• Manufacturer Part Number: MAX3355EEUD
• Description: Charge Pumps
• Manufacturer: Maxim Integrated Products

Specifications of MAX3355EEUD

• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

USB OTG is an emerging USB standard that enables
devices to talk in a peer-to-peer manner on a USB bus.
OTG allows peripherals and mobile devices such as
PDAs, cellular phones, and digital cameras to be
attached directly to one another without requiring a
PC host.
The MAX3355E integrates a charge pump and compara-
tors to enable a system with an integrated USB OTG
dual-role transceiver to function as a USB OTG dual-role
device. The MAX3355E’s internal charge pump supplies
V
Supplement: USB 2.0, Revision 1.0. The MAX3355E’s
internal level-detection comparators monitor important
V
Table 1. Status Bit Significance
Table 2. Status Bit Shutdown
Functionality (SHDN = GND)
Table 3. Device ID
Table 4. Function Select
Note: The 600µA current source is supplied for t
STATUS1
BUS
BUS
STATUS1
ID_IN
Open
0
0
0
1
0
1
voltages needed to support SRP and HNP.
0
power and signaling as defined in On-the-Go
SHDN
0
1
1
1
STATUS2
STATUS2
1
0
ID_OUT
0
0
1
1
_______________________________________________________________________________________
V
0
Charge Pump and Comparators in UCSP
L
Detailed Description
OFFVBUS
V
V
THSESVLD
THSESEND
±15kV ESD-Protected USB On-the-Go
X
0
1
1
V
V
V
V
BUS
SIGNIFICANCE
BUS
SIGNIFICANCE
BUS
BUS
CONFIGURATION
< V
< V
> V
< V
< V
> V
Device A
Device B
BUS
BUS
THVBUSVLD
THSESEND
TH,SHDN
TH,SHDN
< V
< V
VBUSCHRG
THVBUSVLD
THSESVLD
ID_IN
X
X
0
1
(see the Current Generator section).
R
The MAX3355E provides power for the V
an internal charge pump. The charge pump provides
an OTG-compliant output on V
load current. The charge pump can be powered from
voltages between +2.6V and +5.5V. A 0.1µF flying
capacitor, connected between C+ and C-, and a 1µF
(min) decoupling reservoir capacitor on V
required for proper operation.
The charge pump is active if OFFVBUS is connected to
V
connected to GND). To minimize V
reservoir capacitor value between 1µF and 6.8µF. The
charge-pump output is protected from short-circuit con-
ditions on V
the V
An internal current generator injects up to 600µA of cur-
rent onto the V
over the supply voltage variation. The current generator
is connected to V
and ID_IN is open. It remains connected for t
or until the V
and 4.82V.
The MAX3355E contains internal comparators for moni-
toring the V
rized in two status outputs: STATUS1 and STATUS2.
The status outputs can be used to negotiate for the
USB OTG bus. The V
to Table 1. While in shutdown mode, the STATUS2 out-
put can be used to indicate V
Configure the MAX3355E as device A by connecting
ID_IN to GND and as device B by leaving ID_IN open
(Table 3). ID_IN is level translated to V
as an output at ID_OUT. V
level. ID_IN is internally pulled up to V
INVBUS
L
and the MAX3355E is configured as device A (ID_IN
R
R
V
INVBUS
INVBUS
BUS
BUS
5V
(Note 5)
current to 200mA.
BUS
BUS
BUS
BUS
voltage. The status of V
by an internal current clamp that limits
line voltage exceeds the lower of V
BUS
CHARGE PUMP
line. The current generator is stable
BUS
when OFFVBUS and SHDN are 1
Inactive
Inactive
Inactive
Active
status is conveyed according
L
BUS
sets the logic output high
BUS
Current Generator
voltage (Table 2).
while sourcing 8mA
BUS
CC
COMPARATORS
Charge Pump
Comparators
L
.
ripple, select a
BUS
BUS
and provided
Inactive
Active
Active
Active
Device ID
VBUSCHRG
is summa-
line using
BUS
are
CC
7