The Challenge
Wireless remote that wakes instantly when picked up, no button press to turn it on. Had to fit a specific curved enclosure shape.
The Solution
TI CC2640 BLE SoC with an LIS2DH accelerometer configured for motion interrupt wake. The accelerometer draws ~2µA in low-power mode and wakes the CC2640 from shutdown on any movement. Custom-shaped PCB follows the enclosure contour to maximize battery volume. PCB trace antenna with a u.FL test port for antenna characterization in the actual enclosure.
Results
Users just pick it up and it's connected within 200ms. Battery lasts several months because the device spends most of its life in shutdown at ~1µA.
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Low-power wireless with custom form factors is a regular design task.
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