AIC111 & TMS320C54xx Digital Hearing Aid Application

Matt Osborne88112

Other Parts Discussed in Thread: AIC111, TMS320UC5402

Hi there,

I'm looking for some clarification as to whether the TMS320C5402 can be powered at 1.3V using a zinc-air battery.

The AIC111 datasheet (http://www.ti.com/lit/ds/symlink/aic111.pdf) shows this as being the case in figure 11 on page 23.

The "Information for Medical Applications" document (http://focus.ti.com/pdfs/vf/medeq/informationformedicalapplications.pdf) describes using the AIC111 & TMS320C54 in a zinc-air application as well on pages 28-30.

The one that really got my attention was "Low-Power Real-Time Programmable DSP Development Platform for Digital Hearing Aids" (http://www.ti.com/lit/an/spra657/spra657.pdf); where the 0.18um technology is spec'd at 0.9V/30-40MIPS/0.18mA/MHz in table 3 on page 18.

However, the lowest power variant I could find (TMS320UC5402) doesn't have any specs as low as 1V; is it possible to run at this low voltage?

Any additional information would be great.

Thanks,

Matt.

over 13 years ago

0 Matt Osborne88112 over 13 years ago

Prodigy 40 points

So are these documents correct in their assertion that the AIC111 & TSM320C54xx can be powered using a zinc-air at 1.3V?

0 Matt Osborne88112 over 13 years ago in reply to Matt Osborne88112

Prodigy 40 points

Is there any TI support here?

0 Don Dapkus over 13 years ago in reply to Matt Osborne88112

TI__Guru**** 189401 points

Hi, Matt,

Since your question is actually on the C5xxx DSP, I will move your post to the appropriate DSP forum. The DSP guys don't usually monitor this forum.

Sorry for the delay.

-d2

0 Mark M over 13 years ago in reply to Don Dapkus

TI__Mastermind 30130 points

Hi Matt,

The datasheet states that the TMS320C5402 must be powered at 1.8V for the Core and 1.8V for the I/O...

The latest C5505/15/35 family of DSPs operate at 1.05V or 1.3V Core supply voltages, but the I/O voltage is still 1.8V (1.71V - 1.98V) - this is typical across most devices.

On the I/O, a logic high is detected when the input voltage crosses 0.65 * VDD, so theoretically the I/O signal could be as low as 1.11V (.65 * 1.71V) and still show a logic high at the I/O.

The hearing aid app note mentions the use of a voltage doubler to achieve 1.8V from 1V for the I/O from the ADC.

Play around with this power estimator tool to get a feel for the power requirements of the C5505/15/35 DSPs:

http://www.ti.com/dsp/docs/litabsmultiplefilelist.tsp?sectionId=3&tabId=409&literatureNumber=sprabm0&docCategoryId=1&familyId=325

Hope this helps,
Mark

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AIC111 & TMS320C54xx Digital Hearing Aid Application