Two-pin Interface Improves Smart Earbuds


Innovative interface between earbuds and cradle allows simultaneous accessory charging and communication for smart earbud

ams has announced an innovative interface technology which provides power and communication between a true wireless earbud and a charging cradle over a two-wire connection. If the earbud only needs to accommodate a two-pin connection to the cradle rather than six pins that are normally required, the designer has much more flexibility to reduce the size of the earbud or to use the space on the surface of the earbud in a way which brings more value to the user

Innovative interface for data, power simplifies earbud design

The ams POW:COM interface technology for the first time enables simultaneous data communication with 1kBit/s net data rate and over 150mA charging current supported, far more than applications need today, according to ams.


The POW:COM interface is implemented with the AS3442 host IC in the cradle, and the AS3447 client IC in each earbud.

The sophisticated POW:COM protocol provides for power transfer at 5V, I2C communication, interrupt signals and up to five GPIOs via a single transmission line between each pair of AS3442 and AS3447 devices.

The communications capability supports an enhanced user experience of the charging cradle. For instance, the earbud can request the battery information from the charger cradle and display it on a mobile app.

The POW:COM interface also allows the earbud manufacturer to implement other useful features, such as auto-recharge, automatic pairing of the earbuds with the user’s phone on opening the charging cradle’s case, and accessory firmware updating while charging.

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“The POW:COM interface from ams radically reduces the constraints on the design of true wireless earbuds,” said Christian Feierl, Marketing Manager at ams.


The AS3442 and AS3447 POW:COM devices are available now in production volumes. Some brand manufacturers have already included the ams POW:COM devices in their earbuds, with anticipated availability in December, in time for the holiday season.

An evaluation board for the POW:COM interface parts is available on ams online shop. For sample requests or for more technical information, click here.



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