TS5USBA224: Question on Implementing Analog Audio in ESP32 Application

Mark Beeman

Part Number: TS5USBA224

I am working an esp32 project and want to take analog data from an FM receiver and output through a USB. I will also be using the USB for uploading data to the esp32 and charging a lipo battery. The TS5USBA224 looks like a perfect fit for what I am doing but I have questions. I am really pretty green with some of this stuff so please be kind.

From the data sheet:

It appears from this that Vaudio actually supplies power to the chip and if Vaudio=0, you cannot get any data from the USB output (D+/R , D-/L) even if VBUS is +5V. My question is, if I am uploading data to the esp32 over the usb, does Vaudio have power while uploading? If not, then D+/D- will be off and it seems the data wont get through the switch. It seems to me that the way it SHOULD work is if Vbus is H and Vaudio is L, then D+/D- should still be enabled if Asel is low.

I am woundering if I am mission something.

Any help is appreciated!!

Mark

over 1 year ago

0 Brian Zhou over 1 year ago

TI__Guru*** 146735 points

HI Mark:

As long as Vaudio is low, Both USB2 and audio R/L will be disabled.

Regadrs

Brian

0 Mark Beeman over 1 year ago in reply to Brian Zhou

Prodigy 10 points

Hi Brian:

Yes, I see that. If the USB is being used to flash the MCU (and thus will require D+/D- to be active) that means Vaudio will have to be high during flashing. I think that is true so long as Vaudio=H on my board (I think I answered my own question). But this brings up another question:

How do I find the current draw (and minimize it) when the usb is not in use for either audio or data? The datasheet says "Ioff Supports Partial Powerdown Mode"

Would the approach for least power consumption be when neither audio nor data/power is used i.e. Vaudio = L?

If Vaudio=L is the required condition for lowest power consumtion, then I need to actively switch Vaudio=H when the audio is in use OR the usb is connected.

0 Brian Zhou over 1 year ago in reply to Mark Beeman

TI__Guru*** 146735 points

Hi Mark:

Once Vaudio is high , either Audio path or USB path will be on. Only Vaudio is low, will be lower power mode. So you may need to switch Vaudio to save power.

Regards

brian

0 Mark Beeman over 1 year ago in reply to Brian Zhou

Prodigy 10 points

o.k. Brian, last question. Is there a place on the datasheet that provides the "typical" current with Vaudio=H but no load on either Audio or USB path?

0 Brian Zhou over 1 year ago in reply to Mark Beeman

TI__Guru*** 146735 points

Sorry, I can't find typical current in datasheet when Vaudio is H but no load.

Regards

Brian

0 Mark Beeman over 1 year ago in reply to Brian Zhou

Prodigy 10 points

Yeah, maybe I am nisinterpreting the datasheets. But it says the current leakage for the switch ON with D+/R = Open is 50 nA in both the usb and the audio mode. But it also lists this as the same voltage with switch OFF and VD+/R = Open. So I am confused as to why you would say I have to set Vaudio = OFF for lower power model.

+1 Mark Beeman over 1 year ago in reply to Mark Beeman

Prodigy 10 points

Wait Under "Digital Control Inputs it shows Iin = 10uA with Vin=3.6V vs 1 uA with Vin =0. I think that is it, right?

0 Brian Zhou over 1 year ago in reply to Mark Beeman

TI__Guru*** 146735 points

50 na is IO leakage, you asked for supply current, right?

this is supply current but with wither USB or audio.

Regards

Brian

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TS5USBA224: Question on Implementing Analog Audio in ESP32 Application