A Crystal-Free Single-Chip Micro Mote with Integrated 802.15.4 Compatible Transceiver, sub-mW BLE Compatible Beacon Transmitter, and Cortex M0

Maksimovic, Filip; Wheeler, Brad; Burnett, D.; Khan, Osama; Mesri, Sahar; Suciu, Ioana; Lee, Lydia; Moreno, Álex; Sundararajan, Arvind; Zhou, Bob; Zoll, Rachel; Ng, Andrew H.; Chang, Tengfei; Villajosana, Xavier; Watteyne, Thomas; Niknejad, Ali M.; Pister, Kristofer S. J.

doi:10.23919/vlsic.2019.8777971

Cited by 40 publications

(36 citation statements)

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“…The Single Chip micro-Mote, or SCµM, is a true crystal-free chip we taped out in 2019 [8]. It is a 2×3 mm 2 single-chip crystal-free mote-on-chip which contains an ARM Cortex-M0 micro-controller, a 2.4 GHz IEEE802.15.4 radio, and an optical receiver for optical programming.…”

Section: Introductionmentioning

confidence: 99%

6TiSCH on SCμM: Running a Synchronized Protocol Stack without Crystals

Chang

Watteyne

Wheeler

et al. 2020

Sensors

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We report the first time-synchronized protocol stack running on a crystal-free device. We use an early prototype of the Single-Chip micro Mote, SCμM, a single-chip 2 × 3 mm2 mote-on-a-chip, which features an ARM Cortex-M0 micro-controller and an IEEE802.15.4 radio. This prototype consists of an FPGA version of the micro-controller, connected to the SCμM chip which implements the radio front-end. We port OpenWSN, a reference implementation of a synchronized protocol stack, onto SCμM. The challenge is that SCμM has only on-chip oscillators, with no absolute time reference such as a crystal. We use two calibration steps – receiving packets via the on-chip optical receiver and RF transceiver – to initially calibrate the oscillators on SCμM so that it can send frames to an off-the-shelf IEEE802.15.4 radio. We then use a digital trimming compensation algorithm based on tick skipping to turn a 567 ppm apparent drift into a 10 ppm drift. This allows us to run a full-featured standards-compliant 6TiSCH network between one SCμM and one OpenMote. This is a step towards realizing the smart dust vision of ultra-small and cheap ubiquitous wireless devices.

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Section: Introductionmentioning

confidence: 99%

6TiSCH on SCμM: Running a Synchronized Protocol Stack without Crystals

Chang

Watteyne

Wheeler

et al. 2020

Sensors

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“…Autonomous microsystems, such as microrobots, have limited payload capabilities, which require their processing and communication platforms to be highly miniaturized. The 2×3×0.3 mm 3 , 5 mg, Single Chip Micro Mote (SCµM) [1] is an example of a suitable system for microrobots, containing an ARM Cortex-M0 microprocessor and a crystal-free 2.4 GHz radio with full IEEE 802.15.4 compatibility and limited Bluetooth Low Energy transmit capabilities. Localization of these systems is important for them to perform intelligent tasks in the real world.…”

Section: Introductionmentioning

confidence: 99%

Accurate 3D Lighthouse Localization of a Low-Power Crystal-Free Single-Chip Mote

Kilberg

Campos

Maksimovic

et al. 2020

J. Microelectromech. Syst.

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We present a system for centimeter-precision 3 dimensional localization of a 2×3×0.3 mm 3 , 5 mg, wireless systemon-chip by utilizing a temporally-structured infrared illumination scheme generated by a set of base stations. This 3D localization system builds on previous work by adding a second lighthouse station to enable 3D localization and using the integrated wireless radio, making the localization system fully wireless. We demonstrate 3D tracking with mean absolute errors of 1.54 cm, 1.50 cm, and 5.1 cm for the X, Y, and Z dimensions. This is the first time such a lighthouse localization system has been able to localize a monolithic single-chip wireless system.

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“…The Single-Chip Micro Mote (SCµM, Fig. 1) is a 2×3×0.3 mm 3 system-on-chip that contains an ARM Cortex-M0 and a 2.4 GHz radio compatible with IEEE802.15.4 and BLE [1]. Unlike existing radios, SCµM only requires an antenna and a power source, no external crystal oscillator.…”

Section: Introductionmentioning

confidence: 99%

“…Future work involves the extension of the temperature compensation used in [1] to apply frequency corrections derived from network traffic to all the free-running oscillators. Fig.…”

Section: Introductionmentioning

confidence: 99%