ISL54217IRTZ-T datasheet(11/21 Pages) INTERSIL

部品番号	ISL54217IRTZ-T

部品情報	USB 2.0 High-Speed x 2Channels/Stereo Audio Dual SP3T (Dual 3-to-1 Multiplexer)

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メーカー	INTERSIL [Intersil Corporation]

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11

FN6817.3

May 4, 2009

Logic Control Voltage Levels

With VDD in the range of 2.7V to 3.6V the logic levels are:

C1, C0 = Logic “0” (Low) when

≤ 0.5V or Floating.

C1, C0 = Logic “1” (High) when

≥ 1.4V

ALL SWITCHES OFF Mode

If the C1 pin = Logic “0” and C0 pin = Logic “0” the part will

be in the ALL SWITCHES OFF mode. In this mode the 2D-

and 2D+ USB switches, the L and R audio switches and the

1D- and 1D+ USB switches will be OFF (high impedance).

The audio click and pop shunt circuitry will be activated (ON)

and the 1k

Ω COM shunt resistors will be disconnected

(OFF).

Before powering down or powering up of the audio CODECs

drivers the ISL54217 should be put in the ALL SWITCHES

OFF mode. In this mode transients present at the L and R

signal pins due to the changing DC voltage of the audio

drivers will not pass to the headphones, preventing clicks

and pops in the headphones. See the “AC Coupled click and

pop operation” on page 12.

It is recommended that when transitioning from USB1 to

USB2 or from USB2 to USB1 that you always pass through

the All Switches OFF state.

Audio Mode

If the C1 pin = Logic “1” and C0 pin = Logic “1” the part will

be in the Audio mode. In Audio mode the L (left) and R (right)

2.3

Ω audio switches are ON. The 1D- and 1D+ 6.2Ω USB

switches and 2D- and 2D+ 6.2

Ω USB switches will be OFF

(high impedance).

The audio click and pop circuitry is de-activated. The 1k

Ω

shunts on the COM side of the switch will be disconnected

(OFF).

When a headphone is plugged into the common connector,

the µcontroller will drive the C1 and C0 logic pins “High”

putting the part in the audio mode. In the audio mode, the

audio drivers of the player can drive the headphones and

play music.

USB1 Mode

If the C1 pin = Logic “0” and C0 pin = Logic “1” the part will

go into USB1 mode. In USB1 mode the 1D- and 1D+ 6.2

Ω

switches are ON. The L and R 2.3

Ω audio switches and 2D-

and 2D+ 6.2

Ω USB switches will be OFF (high impedance).

The audio L and R click and pop shunt circuitry will be

activated and the 1k

Ω COM shunt resistors will be

disconnected (OFF).

When a USB cable from a computer or USB hub is

connected at the common connector, the µcontroller will

route the incoming USB signal to USB transceiver section #1

by taking the C1 pin “Low” and the C0 pin “High” putting the

ISL54217 part into the USB1 mode. In USB1 mode the

computer or USB hub transceiver and the MP3 player or

cellphone USB transceiver #1 are connected and digital data

will be able to be transmit back and forth.

USB2 Mode

If the C1 pin = Logic “1” and C0 pin = Logic “0” the part will

be in the USB2 mode provided that the last state was not the

Audio or Audio Mute state. In the USB2 mode the 2D- and

2D+ 6.2

Ω USB switches will be ON and audio switches and

the 1D- and 1D+ USB switches will be OFF (high

impedance).

The audio L and R click and pop shunt circuitry will be

activated and the 1k

Ω COM shunt resistors will be

disconnected (OFF).

When a USB cable from a computer or USB hub is

connected at the common connector, the

μcontroller will

route the incoming USB signal to USB transceiver section #2

by taking the C1 pin “High” and the C0 pin “Low” putting the

ISL54217 part into the USB2 mode. In USB2 mode the

computer or USB hub transceiver and the MP3 player or

cellphone USB transceiver #2 are connected and digital data

will be able to be transmit back and forth.

Audio MUTE Mode

If the C1 pin = Logic “1” and C0 pin = Logic “0” the part will

be in the Audio MUTE mode provided that the last state was

the Audio state. In the audio MUTE mode the 2D- and 2D+

USB switches, the L and R audio switches and the 1D- and

1D+ USB switches will be OFF (high impedance).

The audio click and pop shunt circuitry will be de-activated

and the 1k

Ω COM shunt resistors will be connected (ON).

Note: 1k

Ω COM shunt resistors are only ON when in Audio

MUTE mode.

The 1k

Ω shunts provide 77dB of off-isolation when driving

10k

Ω to 20kΩ amplifier inputs.

Logic Control Timing Between C1 and C0

The ISL54217 has a unique logic control architecture. The

part has five different logic states but only two external logic

control pins, C1 and C0. Refer to “State Diagram” on page 2

and “Truth Table” on page 3.

The following state transitions require both C1 and C0 logic

control bits to change their logic levels in unison:

All OFF(C1 = 0, C0 = 0) -----> Audio (C1 = 1, C0 =1)

Audio (C1 = 1, C0 = 1) -----> All OFF (C1 = 0, C0 = 0)

Audio Mute (C1 = 1, C0 = 0) -----> USB1 (C1 = 0, C0 = 1)

The delay time between transition of these bits must be

< 100ns to ensure that you directly move between these

states without momentarily transitioning to one of the other

states.

For example, if you are going from the “All OFF” state to the

“Audio” state and C0 does not go high until 100ns after C1

went high you will momentarily transition to the “USB2” state.

ISL54217

同様の部品番号 - ISL54217IRTZ-T

メーカー	部品番号	データシート	部品情報
Intersil Corporation	ISL54217IRTZ-T	1Mb / 24P	USB 2.0 High-Speed x 2 Channels/Stereo Audio Dual SP3T Dual 3-to-1 Multiplexer
Intersil Corporation	ISL54217IRTZ-T	1Mb / 24P	USB 2.0 High-Speed x 2 Channels/Stereo Audio Dual SP3T (Dual 3-to-1 Multiplexer) June 17, 2010
Renesas Technology Corp	ISL54217IRTZ-T	1Mb / 24P	USB 2.0 High-Speed x 2 Channels/Stereo Audio Dual SP3T (Dual 3-to-1 Multiplexer)

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