MAX3301EETJ Maxim Integrated, MAX3301EETJ Datasheet - Page 14

• Manufacturer Part Number: MAX3301EETJ
• Description: USB Interface IC
• Manufacturer: Maxim Integrated

Specifications of MAX3301EETJ

• Operating Supply Voltage: 3 V to 4.5 V
• Operating Supply Current: 5 uA

USB On-the-Go Transceivers and Charge Pumps
session end comparator threshold. Figure 12 shows the
level-detector comparators. The interrupt-enable regis-
ters (Tables 12 and 13) determine whether a falling or
rising edge of V
The USB OTG specification defines an ID input that
determines which dual-role device is the default host.
An OTG cable connects ID to ground in the connector
of one end and is left unconnected in the other end.
Whichever dual-role device receives the grounded end
becomes the A device. The MAX3301E/MAX3302E pro-
vide an internal pullup resistor on ID_IN. Internal com-
parators detect if ID_IN is grounded or left floating.
When OTG events require action, the MAX3301E/
MAX3302E provide an interrupt output signal on INT.
Alternatively, OE/INT can be configured to act as an
interrupt output while the device operates in USB sus-
pend mode. Program INT and OE/INT as open-drain or
push-pull interrupts with irq_mode (bit 1 of special-func-
tion register 2, see Tables 15 and 16).
V
and/or provides a power source for the internal linear reg-
ulator. The V
switching functions required by an OTG dual-role device.
These actions are programmed by the system logic using
bits 5 to 7 of control register 2 (see Table 8) to:
14
 = Enabled.
X = Disabled.
1. For the MAX3301E, enter shutdown mode by writing a 1 to sdwn (bit 0 of special-function register 2). For the MAX3302E, enter
2. Enter interrupt shutdown mode by writing a 1 to int_sdwn (bit 0 of special-function register 1).
3. Enter suspend mode by writing a 1 to spd_susp_ctl (bit 1 of special-function register 1) and suspend (bit 1 of control register 1), or
Table 1. Functional Blocks Enabled During Specific Operating Modes
BUS
Shutdown
Shutdown
Operating
Suspend
Interrupt
Normal
MODE
shutdown mode by writing a 0 to sdwn (bit 0 of special-function register 2).
by writing a 0 to spd_susp_ctl (bit 1 of special-function register 1) and driving SUS high.
______________________________________________________________________________________
is a dual-function port that powers the USB bus
3
1
2
BUS
I
2
✓
✓
✓
✓
C
BUS
power-control block performs the various
ID_IN
asserts these status bits.
✓
✓
✓
X
sess_end
COMP
V
✓
✓
X
X
BUS
Interrupt Logic
Power Control
sess _vld
COMP
✓
✓
✓
X
ID_IN
vbus_ vld
COMP
✓
✓
X
X
•
•
•
The OTG supplement allows an A device to turn V
off when the bus is not being used to conserve power.
The B device can issue a request that a new session be
started using SRP. The B device must discharge V
to a level below the session-end threshold (0.8V) to
ensure that no session is in progress before initiating
SRP. Setting bit 6 of control register 2 to 1, discharges
V
When V
from the circuit by resetting bit 6 of control register 2.
An OTG A device is required to supply power on V
The MAX3301E/MAX3302E provide power to V
V
register 2 to 1 in both cases. Bit 5 in control register 2
controls a current-limited switch, preventing damage to
the device in the event of a V
An OTG B device (peripheral mode) can request a ses-
sion using SRP. One of the steps in implementing SRP
requires pulsing V
resistor limits the current according to the OTG specifi-
cation. Pulse V
ing bit 7 of control register 2. Prior to pulsing V
7), a B device first connects an internal pulldown resis-
tor to discharge V
The discharge current is limited by the 5kΩ resistor and
set by bit 6 of control register 2. An OTG A device must
BUS
CC
Discharge V
Provide power-on or receive power from V
Charge V
COMP
cr_int
or from the internal charge pump. Set bit 5 in control
✓
✓
X
X
to GND through a 5kΩ current-limiting resistor.
BUS
BUS
has discharged, the resistor is removed
COMP
BUS
dp_hi
BUS
✓
✓
✓
X
through a resistor
BUS
BUS
through the pullup resistor by assert-
through a resistor
high for a controlled time. A 930Ω
below the session-end threshold.
COMP
dm_hi
✓
✓
✓
X
BUS
TRM
short circuit.
✓
✓
X
X
TX
✓
✓
X
X
DIFF
RX
BUS
✓
X
X
X
BUS
BUS
BUS
from
SE
RX
BUS
BUS
✓
✓
X
X
(bit
.