3
AN1407.0
January 23, 2009
can be plugged directly into this receptacle or through a
standard USB cable.
In USB mode, the USB host controller and USB device will
be connected through the internal USB switches of the IC.
Unlike the audio switches, the USB switches are
bi-directional, which allow the host (computer) and
downstream USB device to both send and receive data.
Note: Before connecting the USB host controller at connector
J1, the headphones must be removed from the headphone
speaker jack, J7. This will prevent the audio load from
interfering with USB signal transmission. The main purpose of
the ISL54210 device is to allow the use of a common USB and
Audio Headphone Connector in Personal Media Players and
other portable battery powered equipment. Either a headphone
will be in the common connector to play music or a USB cable
from a computer will be in the common connector to transmit
digital data, such as music, into the memory of the Media
Player.
The BNC connector J8 (COM-) is in parallel with the D- line of
the J1 USB connector. The BNC connector J9 (COM+) is in
parallel with the D+ line of the J1 USB connector.
The BNC connector J14 (D-) is in parallel with the D- line of the
J2 USB connector. The BNC connector J15 (D+) is in parallel
with the D+ line of the J2 USB connector. If you want to use the
J14 and J15 BNC connectors, you must populate R1 and R2
with 0
Ω
resistors. These BNC connectors can be used to
connect test equipment to evaluate the performance of the IC.
Board Component Definitions
DESIGNATOR
DESCRIPTION
U1
ISL54210IRUZ IC
J1
“B” type USB Receptacle
J2
“A” type USB Receptacle
J3, J5
Left Stereo Audio Input
J4, J6
Right Stereo Audio Input
J7
Headphone Speaker Jack
J8
COM- BNC Connector
J9
COM+ BNC Connector
J10
VDD Positive Connection
J11
VDD Negative Connection
J12
CTRL Logic Control
J13
V
BUS
Logic Control
J14
D- BNC Connector
J15
D+ BNC Connector
JP1, JP2
D-/D+ Differential Probe Connection
JP3
V
BUS
Pin Connector Selection
Jumper Position 2 - 3 Control through J13
Jumper Position 2 - 1 Control through J1
JP4
Connect 4M
Ω
Pull-down Resistor to IN Pin
Application Note 1407
