- 您现在的位置：买卖IC网 > PDF目录384520 > ISL54205AIRZ-T (INTERSIL CORP) MP3/USB 2.0 High Speed Switch with Negative Signal Handling PDF资料下载
参数资料
| 型号： | ISL54205AIRZ-T |
| 厂商： | INTERSIL CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | MP3/USB 2.0 High Speed Switch with Negative Signal Handling |
| 中文描述： | DUAL 1-CHANNEL, SGL POLE DOUBLE THROW SWITCH, PDSO10 |
| 封装： | 3 X 3 MM, ROHS COMPLIANT, MO-229WEED-3, TDFN-10 |
| 文件页数： | 9/14页 |
| 文件大小： | 352K |
| 代理商： | ISL54205AIRZ-T |
9
FN6342.1
December 7, 2006
The USB switches are active (turned ON) whenever the
V
BUS
voltage is
≥
to V
DD
+ 0.8V. V
BUS
is internally pulled
low, so when V
BUS
is floating, the USB switches are OFF.
Note: Whenever the USB switches are ON the audio drivers
of the CODEC need to be at AC or DC ground or floating to
keep from interfering with the data transmission.
ISL54205A Operation
The discussion that follows will discuss using the ISL54205A
in the typical application shown in the block diagram on
page 8.
LOGIC CONTROL
The state of the ISL54205A device is determined by the
voltage at the VBUS pin (pin 2) and the CTRL pin (pin 10).
Refer to truth-table on page 2 of data sheet.
The VBUS pin and CTRL pin are internally pulled low
through 4M
Ω
resistors to ground and can be left floating. The
CTRL control pin is only active when V
BUS
is logic “0”.
Logic control voltage levels:
V
BUS
= Logic “0” (Low) when V
BUS
≤
V
DD
+ 0.2V or
Floating.
V
BUS
= Logic “1” (High) when V
BUS
≥
V
DD
+ 0.8V
CTRL = Logic “0” (Low) when
≤
0.5V or floating.
CTRL = Logic “1” (High) when
≥
1.4V
Audio Mode
If the VBUS 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) 3
Ω
audio switches are ON and the D- and D+ 5
Ω
switches are OFF (high impedance). In a typical application,
V
DD
will be in the range of 2.7V to 3.6V and will be
connected to the battery or LDO of the MP3 player or cell
phone. When a headphone is plugged into the common
connector, nothing gets connected at the VBUS pin (it is
floating) and as long as the CTRL = Logic “1,” the
ISL54205A part remains in the audio mode and the audio
drivers of the player can drive the headphones and play
music.
USB Mode
If the VBUS 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+ 5
Ω
switches are ON and the L and R 3
Ω
audio
switches are OFF (high impedance). When a USB cable
from a computer or USB hub is connected at the common
connector, the voltage at the VBUS pin will be driven to be in
the range of 4.4V to 5.25V. The ISL54205A 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 ISL54205A
automatically turns the D+ and D- switches OFF.
Low Power Mode
If the VBUS 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.
EXTERNAL VBUS SERIES RESISTOR
The ISL54205A contains a clamp circuit between VBUS and
VDD. Whenever the VBUS voltage is greater than the VDD
voltage by more than 2.55V, current will flow through this
clamp circuitry into the V
DD
power supply bus.
During normal USB operation, V
DD
is in the range of 2.7V to
3.6V and V
BUS
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 V
BUS
voltage from the computer could be applied at the VBUS pin
before the V
DD
voltage is up to its normal operating voltage
range and current will flow through the clamp into the V
DD
power supply bus. This current could be quite high when
V
DD
is OFF or at 0V and could potentially damage other
components connected in the circuit. In the application
circuit, a 22k
Ω
resistor has been put in series with the VBUS
pin to limit the current to a safe level during this situation.
It is recommended that a current limiting resistor in the range
of 10k
Ω
to 50k
Ω
be connected in series with the VBUS pin. It
will have minimal impact on the logic level at the VBUS 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
V
BUS
will not exceed V
DD
by more than 2.55V.
POWER
The power supply connected at VDD (pin 1) provides power
to the ISL54205A part. Its voltage should be kept in the
range of 2.7V to 3.6V when used in a USB/Audio application
to ensure you get proper switching when the V
BUS
voltage is
at its lower limit of 4.4V.
ISL54205A
相关PDF资料 |
PDF描述 |
|---|---|
| ISL54205EVAL1Z | MP3/USB 2.0 High Speed Switch with Negative Signal Handling |
| ISL54206 | MP3/USB 2.0 High Speed Switch with Negative Signal Handling |
| ISL54206IRUZ-T | MP3/USB 2.0 High Speed Switch with Negative Signal Handling |
| ISL54206IRZ | MP3/USB 2.0 High Speed Switch with Negative Signal Handling |
| ISL54206IRZ-T | MP3/USB 2.0 High Speed Switch with Negative Signal Handling |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL54205B | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:MP3/USB 2.0 High Speed Switch with Negative Signal Handling |
| ISL54205BEVAL1Z | 功能描述:EVALUATION BOARD FOR ISL54205B RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PCI Express® (PCIe) 主要目的:接口，收发器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要属性:- 次要属性:- 已供物品:板 |
| ISL54205BIRTZ | 功能描述:IC SWITCH AUDIO/USB 10-TDFN RoHS:是 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:250 系列:- 功能:开关 电路:单刀单掷 导通状态电阻:48 欧姆 电压电源:单电源 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V 电流 - 电源:5µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:48-LQFP 供应商设备封装:48-LQFP（7x7） 包装:托盘 |
| ISL54205BIRTZ-T | 功能描述:IC USB SWITCH DUAL SPDT 10TDFN RoHS:是 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:36 系列:- 功能:多路复用器 电路:2 x 4:1 导通状态电阻:75 欧姆 电压电源:单/双电源 电压 - 电源，单路/双路(±):2 V ~ 12 V，±2 V ~ 6 V 电流 - 电源:- 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 供应商设备封装:20-SOIC W 包装:管件 |
| ISL54205BIRUZ-T | 功能描述:IC USB SWITCH DUAL SPDT 10UTQFN RoHS:是 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:36 系列:- 功能:多路复用器 电路:2 x 4:1 导通状态电阻:75 欧姆 电压电源:单/双电源 电压 - 电源，单路/双路(±):2 V ~ 12 V，±2 V ~ 6 V 电流 - 电源:- 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 供应商设备封装:20-SOIC W 包装:管件 |
发布紧急采购，3分钟左右您将得到回复。