Bluetooth Smart solution for compact wearable accessories

December 03, 2013 // By Graham Prophet
CSR's CSR1012 combines CSR µEnergy silicon to create a Bluetooth Smart platform with a small form factor for developers looking to create low-power wearable accessories. CSR1012 is part of the CSR µEnergy range, in a smaller form factor package for smart watches and activity monitors.

The platform provides a form factor small enough for wearable devices but critically still uses standard PCB technology, which allows developers to get a high-volume product to market quickly and cost effectively. It’s also the first solution to support direct connection to a lithium-ion battery without the need for an external regulator. This ensures long-battery life which is critical for wearable accessories.

In addition to wearable technology, the solution can also be used for other small form factor ‘appcessories’ and HID accessories, such as slim smartphone or tablet styluses and small advertising beacons.

The 0.4 mm pitch QFN package can be handled easily on high-volume production lines. Space beneath the device enables I/O to be routed using standard drilled vias. This coupled with a 4 x 4 package area, offers a very small final PCB to ensure developers can produce compact wearable devices with consumer appeal. The CSR1012 is available in volume. CSR will offer developers CSR1012 reference designs with full manufacturing information. These are downloadable from CSR’s support site.

 

The CSR1012 is based on CSR µEnergy silicon and is fully compatible with CSR’s existing software, enabling an easy transition for developers using CSR1010 and CSR1011 solutions looking to develop wearable accessories with CSR1012. The CSR1012 is designed to ensure the longest battery life possible for wearable accessories. It is the first solution that can be directly connected to rechargeable battery chemistries without the need for an external regulator. This not only saves cost and PCB area, but crucially saves precious quiescent leakage current in the external regulator. The quiescent of an external switcher can be 10-15 µA and of a linear 1-2 µA, which can significantly reduce the battery life of a device that is only working in the nano Amp to low micro Amp range. The platform achieves this using an on-chip switched mode power supply that operates from 1.8V to 4.3V. This enables the device to