MAX14550E Maxim, MAX14550E Datasheet - Page 9

• Manufacturer Part Number: MAX14550E
• Description: The MAX14550E is a USB Hi-Speed analog switch with a USB host charger (dedicated charger) identification circuit
• Manufacturer: Maxim

The MAX14550E is a combination of a Hi-Speed USB
analog switch and a charger host identification detec-
tion 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 on-
resistance. DP and DM can survive signals between 0V
and 6V with any supply voltage.
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 V
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.
USB Host Charger Identification Analog Switch
RDP
RDM
CC
Detailed Description
0.4V
when the internal resistor-divider
GND
RM2
RP2
Resistor-Dividers
V
V
CC_SW
CC_SW
RP1
RM1
V
2.1V
CC_SW
CC
MAX14550E
) to
R
S
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 exter-
nal resistor-dividers are detected at RDP (V
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 par-
ticular 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.
TDM
Q
0.4V
TDP
500kI
CBO
CONTROL
LOGIC
CB1
Functional Diagram
PROTECTION
ESD
DM
DP
Switch Control
RDP
> 0.4V).
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