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参数资料
| 型号： | ISL54206AEVAL1Z |
| 厂商： | Intersil |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD FOR ISL54206A |
| 标准包装： | 1 |
| 主要目的： | 接口，模拟和数字式开关 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ISL54206A |
| 主要属性： | 2 x SPDT 音频和 USB 开关 |
| 次要属性： | 2.7 V ~ 5.5 V 电源 |
| 已供物品： | 板 |
ISL54206A
11
FN6515.3
October 28, 2010
the processor. The CTRL control pin is only active when
IN is logic “0”.
The IN pin does not have an internal pull-down resistor and
must not be allowed to float. It must be driven High or Low.
The voltage at the IN pin can exceed the VDD voltage by
as much as 2.55V. This allows the VBUS voltage from a
computer or USB hub (4.4V to 5.25V) to drive the IN pin
while the VDD voltage is in the range of 2.7V to 3.6V. An
external pull-down resistor is required from the IN pin to
ground when directly driving the IN pin with the
computer VBUS voltage. See “USING THE COMPUTER
Logic Control Voltage Levels
IN = Logic “0” (Low) when IN ≤0.5V
IN = Logic “1” (High) when IN ≥1.4V
CTRL = Logic “0” (Low) when ≤0.5V or floating.
CTRL = Logic “1” (High) when ≥1.4V
Audio Mode
If the IN pin = Logic “0” and CTRL pin = Logic “1,” the part
will be in the Audio mode. In Audio mode, the L (left) and R
(right) 3Ω audio switches are ON and the D- and D+ 5Ω
USB switches are OFF (high impedance).
When nothing is plugged into the common connector or a
headphone is plugged into the common connector, the
processor will sense that there is no voltage at the
VBUS pin of the connector and will drive and hold the IN
control pin of the ISL54206A low. As long as the
CTRL = Logic “1,” the ISL54206A part will be in the audio
mode and the audio drivers of the media player can drive
the headphones and play music.
USB Mode
If the IN pin = Logic “1” and CTRL pin = Logic “0” or
Logic “1” the part will go into USB mode. In USB mode,
the D- and D+ 5Ω switches are ON and the L and R 3Ω
audio switches are OFF (high impedance).
When a USB cable from a computer or USB hub is
connected at the common connector, the processor will
sense the presence of the 5V VBUS and drive the IN pin
voltage high. The ISL54206A part will go into the USB
mode. In USB mode, the computer or USB hub
transceiver and the MP3 player or cell phone USB
transceiver are connected and digital data will be able to
be transmitted back and forth.
When the USB cable is disconnected, the processor will
sense that the 5V VBUS voltage is no longer connected
and will drive the IN pin low and put the part back into
the Audio or Low Power Mode.
Low Power Mode
If the IN pin = Logic “0” and CTRL pin = Logic “0,” the
part will be in the Low Power mode. In the Low Power
mode, the audio switches and the USB switches are OFF
(high impedance). In this state, the device draws
typically 1nA of current.
USING THE COMPUTER VBUS VOLTAGE TO DRIVE
THE “IN” PIN
External IN Pull-Down Resistor
Rather than using a microprocessor to control the IN
logic pin you can directly drive the IN pin using the VBUS
voltage from the computer or USB hub. In order to do
this, you must connect an external resistor from the IN
pin to ground.
When a headphone or nothing is connected at the common
connector, the external pull-down will pull the IN pin low
putting the ISL54206A in the Audio mode or Low Power
mode depending on the condition of the CTRL pin.
When a USB cable is connected at the common
connector, the voltage at the IN pin will be driven to 5V
and the part will automatically go into the USB mode.
When the USB cable is disconnected from the common
connector, the voltage at the IN pin will be pulled low by the
pull-down resistor and return to the Audio Mode or Low
Power Mode depending on the condition of the CTRL pin.
Note: The voltage at the IN pin can exceed the VDD
voltage by as much as 2.55V. This allows the VBUS
voltage from a computer or USB hub (4.4V to 5.25V) to
drive the IN pin while the VDD voltage is in the range of
2.7V to 3.6V.
External IN Series Resistor
The ISL54206A contains a clamp circuit between IN and
VDD. Whenever the IN voltage is greater than the VDD
voltage by more than 2.55V, current will flow through
this clamp circuitry into the VDD power supply bus.
During normal USB operation, VDD is in the range of 2.7V
to 3.6V and IN (VBUS voltage from computer or USB
hub) is in the range of 4.4V to 5.25V, the clamp circuit is
not active and no current will flow through the clamp into
the VDD supply.
In a USB application, the situation can exist where the
VBUS voltage from the computer could be applied at the
IN pin before the VDD voltage is up to its normal
operating voltage range and current will flow through the
clamp into the VDD power supply bus. This current could
be quite high when VDD is OFF or at 0V and could
potentially damage other components connected in the
circuit. In the application circuit, a 22kΩ resistor has
been put in series with the IN pin to limit the current to a
safe level during this situation.
It is recommended that a current limiting resistor in the
range of 10kΩ to 50kΩ be connected in series with the IN
pin. It will have minimal impact on the logic level at the
IN pin during normal USB operation and protect the
circuit during the time VBUS is present before VDD is up
to its normal operating voltage.
Note: No external resistor is required in applications
where the voltage at the IN pin will not exceed VDD by
more than 2.55V.
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