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Here, we present an on-chip spectrometer that leverages an integratedthin-film lithium niobate modulator to produce a frequency-agile electro-opticfrequency comb for interrogating chip-scale temperature and accelerationsensors. The low half-wave voltage, $V_{\pi}$, of the modulators and thechirped comb process allows for ultralow radiofrequency drive voltages, whichare as much as seven orders of magnitude less than the lowest found in theliterature and are generated using a chip-scale, microcontroller-driven directdigital synthesizer. The on-chip comb spectrometer is able to simultaneouslyinterrogate both the on-chip temperature sensor and an off-chip,microfabricated optomechanical accelerometer with cutting-edge sensitivities of$\approx 5 {\mu} \mathrm{K} \cdot \mathrm{Hz} ^{-1/2}$ and $\approx 130{\mu}\mathrm{m} \cdot \mathrm{s}^{-2} \cdot \mathrm{Hz}^{-1/2}$, respectively.Notable strengths of this platform include the frequency agility of the opticalfrequency combs, ultralow radiofrequency power requirements and compatibilitywith a broad range of existing photonic integrated circuit technologies.

Agile chip-scale electro-optic frequency comb spectrometer with millivolt drive voltages