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Optimised SoCs key to wearables success

Posted: 05 May 2014  Print Version  Bookmark and Share

Keywords:wearables  Linley  battery 

Wearables require a custom-designed chip, with defined use cases and low battery life support, to lead them into mainstream adoption, according to a panel at the Linley Tech Mobile Conference.

"We need to figure out a way to build a more engaging model. To be successful you need the right use case and battery life will be important. Wearables also have to be easy to use and compatible with other devices," said Linley Group principal analyst Linley Gwennap.

Many wearables may be looked at as fashion accessories where bulkiness and the need to charge more than once a month become prohibitive. Users want their wearable devices—from FitBits to Google Glass and home medical devices—to be sleek, constantly connected through Wi-Fi or Bluetooth, always on, and with an ultra long battery life, he said.

"People don't buy specs when it comes to battery life, they buy behaviour," said Pankaj Kedia, a senior director of product management at Qualcomm. "It's not enough to say low power, you have to define ambient and active modes. But if the thing doesn't last, you're dead; many users want the device to last a week, a month."

Much of the issue around battery life stems from a device's hardware components. Many chips are scaled down versions of handset SoCs, which have different processing requirements than a smartwatch or fitness tracker.

Chipmakers rush wearables to market with borrowed components
Looking inside several devices, ABI research found out that smartwatches utilise smartphone components, resulting in trade-offs involving unsatisfactory battery performance and superfluous features that impact cost and size.

"Smartphone SoCs have different design goals—do we really need that much performance in a wearable," questioned Kurt Schuler, vice president of marketing for Arteris, a provider of SoC interconnects. "We're starting to see SoCs designed for specific targets... Using clocked down SoCs designed for smartphones compromises battery life; a new computing architecture is necessary to fit the ultra low power requirement."

Optimised hardware is key to a long-lasting battery which should be between 200mAH and 300mAH for fitness bands and 300mAH and 500mAH for smartwatches. Instead of using multi-core CPUs designed for smartphones, wearables could use multiple low power CPUs with frequencies under 300MHz. Devices that don't run apps can also forego a graphics core because of small screen sizes, panelists said.

"Picking and choosing the right performance blocks will be important based on the segment you're targeting," Kedia said. "In [always on, targeted experience] devices, the GPU matters less, if at all, and signal processing is most important."

Choosing the right hardware stack and method of heat dissipation will also be among the key ingredients in a successful wearable, which shouldn't get hot with regular wear, they said.

However, the sensors often in wearables are already present in smartphones, begging the question of where wearables will fit in a user's device ecosystem. Finding use cases and proper hardware might be done more quickly in medical, industrial, and military spheres rather than for consumer products, Schuler said.

"Wearables will not save the semiconductor industry. This is the evolution rather than the revolution. This tech is an extension of where we've already been going with hardware and software," Schuler said.

- Jessica Lipsky
  EE Times





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