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Industry’s Smallest and Lowest (VL) Full-Speed
USB Transceivers, with Low VIO 3/5-Wire Interface
MAX14581/MAX14582
14
Interface
The MAX14581/MAX14582 control signals are used to
control the USB D+/D- lines. VL powers the logic-side
interface and sets the input and output thresholds of
these signals. The control signals for the MAX14581 are
DAT, SE0, and OE. The control signals for the MAX14582
are VP, VM, RCV, and OE.
Power-Supply Configuration
Normal Operating Mode
See
Table 1 for various power-supply configurations.
VBUS supplies power to the USB transceivers. Connect
VBUS to a +3.0V to +5.5V supply. Connect VL to a +1.2V
to +3.6V supply. VBUS is typically connected directly to
the USB connector. An internal regulator provides 3.3V to
internal circuitry, and a regulated 3.3V output at VTRM, in
addition to powering the internal D+ pullup resistor. The
ICs can be powered by connecting both VBUS and VTRM
to the same 3.3V external regulator.
VBUS can also be connected directly to a Li+ battery for
inter-chip communications, when the transceiver is used
for example as the USB analog front-end (AFE) of the 3G
modem, used to communicate with the system-on-chip
(SOC).
Suspend Mode
Operate the transceivers in low-power mode by asserting
SUS high. In suspend mode, the USB differential receiver
is turned off and VBUS consumes less than 18FA of sup-
ply current. The single-ended D+ and D- receivers are
still active when driving SUS high.
Sharing Mode
Connect VL to a system power supply and leave VBUS
(or VBUS and VTRM) unconnected or connected to GND.
D+ and D- are three-stated, allowing other circuitry to
share the USB D+ and D- line. VL consumes less than
1FA of supply current. When operating the transceivers
in sharing mode, the SUS and OE inputs are ignored,
and the interface signals (SE0, DAT, or RCV) are high
impedance.
Disable Mode
Connect VBUS to a system power supply and leave VL
unconnected or connect to ground. In disable mode,
D+ and D- are three-stated, and VBUS and/or VTRM (or
VBUS and VTRM) consume less than 13FA (typ). When
operating the transceivers in disable mode, OE, SUS,
and inputs to the interface control signals are according
Table 1. Power-Supply Configuration
Table 2a. Disable Mode and Sharing Mode Connection, 3-Wire Interface
VBUS (V)
VTRM (V)
VL (V)
CONFIGURATION
NOTES
+3.0V to +5.5
+3.0 to +3.6 output
+1.2 to +3.6V
Normal mode
—
+3.0V to +5.5
+3.0 to +3.6 output
GND or unconnected
Disable mode
Tables 2a, 2b
GND or unconnected
High impedance
+1.2 to +3.6V
Sharing mode
Tables 2a, 2b
INPUTS/OUTPUTS
DISABLE MODE
SHARING MODE
VBUS
3.0V to 5.5V
Unconnected or connected to GND
VL
Unconnected or connected to GND
1.2V to 3.6V input
D+ and D-
High impedance
DAT, SE0
High impedance
5kI pullup resistor to VL
SUS
Unconnected or connected to GND
High or low
OE
Unconnected or connected to GND
High or low
BD
Low