Interface Enables True Wireless Earbuds

The invention of ams, POW:COM is an innovative interface technology that enables power and communication between a true wireless earbud and a charging cradle over a two-wire connection. A true wireless earbud previously required as many as six pins to provide both power transfer and communication between the charging cradle and the earbud.


The ams POW:COM interface technology enables simultaneous data communication with a 1-kb/s net data rate and a greater-than 150-mA charging current. It is implemented with the AS3442 host IC in the cradle, and the AS3447 client IC in each earbud. The POW:COM protocol developed by ams 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.

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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 interface also allows the earbud manufacturer to implement other 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.


The AS3442 and AS3447 POW:COM devices are available now in production volumes. An evaluation board is also available. For more details, visit the product page as well as the AS3442 datasheet and AS3447 datasheet.

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