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HSIC USB suspend, resume, and reset

Posted by Terry Moore
Terry Moore
 
User is currently offline
on Saturday, 20 October 2012
in HSIC USB

Gurinder Singh asked me a question on LinkedIn about my article in EE Times, "Measuring HSIC USB without disturbing the system". In that article, I discussed how MCCI measures HSIC USB with the Catena 1910 HSIC USB Protocol Analyser/Generator.

He asked:

How about sleep/wake. When the whole system resumes from sleep how is HSIC handle the reset condition?

Unfortunately, there's not enough room in the reply box. So I've answered the question here....

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Getting power from coin cells

Posted by Terry Moore
Terry Moore
 
User is currently offline
on Friday, 02 December 2011
in Uncategorized

Buried on TI's website, there's a very nice white paper on practical considerations for getting power from coin cells: "Coin cells and peak current draw," http://www.ti.com/lit/wp/swra349/swra349.pdf.

The author, Mathias Jensen, obtained CR2032 coin cells from a variety of vendors, and tested how much energy could be obtained in a variety of circumstances.  His key findings:

  • CR2032 cells have varying real capacities (based on the vendor).
  • Because of internal resistance, if you need bursty power, you should add a capacitor that can be trickle-charged at low current.

Out of politeness, he probably didn't mention some important additional conclusions:

  • Customers are going to buy batteries based on convenience and price, not based on vendor.
  • Many batteries don't nearly acheive their rated capacities in real-world tests.
  • If you want your customers to be satisfied, you have to design for the worst-case battery, not for the best-case.
  • Careful design for the worst-case battery can result in 1.4 times the battery capacity with low-quality batteries.

This is the kind of detail that, properly attended to, makes the difference between products that are loved, and products that are merely used.

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A brief overview of the MCCI Catena 2210

Posted by Terry Moore
Terry Moore
 
User is currently offline
on Monday, 14 November 2011
in Catena 2210

MCCI's Catena 2210 is shipping now. It's an interesting little box designed for testing and evaluating NCM 1.0 compatible host systems. As its first application, the 2210 has been selected by the Car Connectivity Consortium (www.carconnectivity.org) as a component of their test suite for car electronics and other systems that use the MirrorLink™ Specification (formerly known as Terminal Mode) for providing a remote desktop and user interface for smart phones and other intelligent mobile devices. (You might not have heard of MirrorLink - it was formerly known as Terminal Mode; and the consortium was formerly known as the Terminal Mode Consortium, www.terminalmode.org.)

Here's a front view:

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