Bellevue: A 50MHz variable-width SIMD 32bit microcontroller at 0.37V for processing-intensive wireless sensor nodes

In the context of wireless sensor nodes for the Internet-of-Things, there is a need for low-power high-performance computing cores for video monitoring applications. In this paper we present a custom 50MHz 32-bit microcontroller running at 0.37V built on a 65nm LP/GP CMOS process. Part of an energy-harvesting SoC with on-chip CMOS imager, it features adaptive voltage scaling, low-power 1.55μW sleep mode, and a variable-width SIMD pipeline and multiply/divide unit, achieving 7.7μW/MHz overall.

[1]  David Bol,et al.  A 25MHz 7μW/MHz ultra-low-voltage microcontroller SoC in 65nm LP/GP CMOS for low-carbon wireless sensor nodes , 2012, 2012 IEEE International Solid-State Circuits Conference.

[2]  Jaehyuk Choi,et al.  A 3.4-$\mu$ W Object-Adaptive CMOS Image Sensor With Embedded Feature Extraction Algorithm for Motion-Triggered Object-of-Interest Imaging , 2014, IEEE Journal of Solid-State Circuits.

[3]  Ulrich Rückert,et al.  A 200mV 32b subthreshold processor with adaptive supply voltage control , 2012, 2012 IEEE International Solid-State Circuits Conference.

[4]  Jaehyuk Choi,et al.  A 3.4µW CMOS image sensor with embedded feature-extraction algorithm for motion-triggered object-of-interest imaging , 2013, 2013 IEEE International Solid-State Circuits Conference Digest of Technical Papers.

[5]  A.P. Chandrakasan,et al.  A 10-pJ/instruction, 4-MIPS micropower DSP for sensor applications , 2008, 2008 IEEE Asian Solid-State Circuits Conference.

[6]  Nathan Ickes,et al.  A 10 pJ/cycle ultra-low-voltage 32-bit microprocessor system-on-chip , 2011, 2011 Proceedings of the ESSCIRC (ESSCIRC).

[7]  David Bol,et al.  A Sizing Methodology for On-Chip Switched-Capacitor DC/DC Converters , 2014, IEEE Transactions on Circuits and Systems I: Regular Papers.