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AN-6066 APPLIC ATION NOTE
© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com
Rev. 1.0.0 • 2/21/08 3
Functional Descr i pti on
When a FAN3800 headset, configured as shown in Figure 1,
is connected to a device (such as a phone); a pull-down
resistor in the headset pulls ID down below the device’s
supply rail. This change in the ID voltage informs the device
that a headset is attached. The FAN3800 headset provides a
USB low (<0.8V) on D+. The device then looks for a USB
low from the headset. Once acknowledged, the device
provides VBUS to the FAN3800 headset. The FAN3800
reacts by providing a USB low (<0.8V) on D- and USB high
(>2.0V) on D+. With the FAN3800 headset detected, the
device pulls the ID line higher, >1.2V, to switch the headset
to stereo mode. The headset then places a USB low (<0.8V)
on D+. The device verifies a USB low (<0.8V) on both D+
and D-. This acknowledges a FAN3800 headset is present.
In mono mode, the ID line is in a low (<0.8V) state. The
microphone audio is routed through the D+ line and the D-
line routes speaker audio to both the right and left speakers.
In stereo mode, the ID voltage is increased (>1.2V), which
tells the headset to switch to stereo mode. The right speaker
channel from the D+ is routed to the right speaker output and
the left speaker channel from the D- line is routed to the left
speaker output. In stereo mode, the microphone is muted.
In standby, the device turns off the VBUS voltage and
configures the D- line to the internal supply rail. ID
remains biased so the device may detect when the headset
is disconnected.
Layout Considerati ons
When designing in the FAN3800, use the following
guidelines to optimize the design:
1. When possible, use a four-layer board.
2. Place decoupling capacitors (0.1µF and 1µF) as close to
the power (Vs) pins as possible.
3. Place RF bypass capacitors (33pF-100pF) on all I/O
pins, as close to the device as possible.
4. Connect all ground pins as tightly as possible,
preferably with a large ground plane.
5. Minimize all trace lengths to reduce series inductance.