Improved Single-Element Resistive Sensor-to-Microcontroller Interface

Nagarajan, P.; George, Boby; Kumar, V. Jagadeesh

doi:10.1109/tim.2017.2712918

Cited by 68 publications

(57 citation statements)

References 12 publications

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“…Although peripherals can perform some actions simultaneously with the instruction execution done by the CPU, these are completely controlled by the CPU. In other words: the CPU decides when the peripheral starts its action and, once it is finished, the CPU is informed through an interruption [8], [9]; event detection through polling [10] is also possible but not suggested for low-power designs since the CPU is continuously checking the state of the peripherals. need to be done sequentially.…”

Section: Introductionmentioning

confidence: 99%

Toward Non-CPU Activity in Low-Power MCU-Based Measurement Systems

Reverter

2020

IEEE Trans. Instrum. Meas.

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This paper evaluates the benefits of having peripheral-triggered peripherals in a microcontroller unit (MCU) intended for low-power sensor applications. In such an architecture, the functionality is moved from the central processing unit (CPU) to the peripherals so that a peripheral is able to trigger another peripheral with non-CPU intervention. For the sensor data logging application under study, both energy consumption and measuring time are reduced by a factor of two with respect to the case of applying an interrupt-based approach that requires the CPU intervention.

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Section: Introductionmentioning

confidence: 99%

Toward Non-CPU Activity in Low-Power MCU-Based Measurement Systems

Reverter

2020

IEEE Trans. Instrum. Meas.

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“…Such simplicity means that this type of circuit is particularly suited for portable applications, where both the number of components and their consumption are very important. DICs are also highly versatile in terms of the PDDs used, allowing the use of both microcontrollers [4][5][6][7][8][9][10] and field-programmable gate arrays (FPGAs) [11][12][13][14][15][16]. The calculation capabilities of a PDD connected to a DIC allow them to function as smart sensors, pre-processing information from the sensor and thus reducing the workload in subsequent high-level processing and decision stages [17].…”

Section: Introductionmentioning

confidence: 99%

“…Although there are DICs for reading both capacitive and inductive sensors, those for resistive sensors have probably been the most widely used and analyzed in the literature, whether individually [3,7,18,19] or grouped in arrays [11,14]. Several issues need to be considered when designing a resistive DIC, such as accuracy, uncertainty, resolution [6,8,16,[20][21][22], and calibration points [23].…”

Section: Introductionmentioning

confidence: 99%

Reducing Measurement Time in Direct Interface Circuits for Resistive Sensor Readout

Hidalgo-López

Sánchez-Durán

Oballe-Peinado

2020

Sensors

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Direct Interface Circuits (DICs) carry out resistive sensor readings using a resistance-to-time-to-digital conversion without the need for analog-to-digital converters. The main advantage of this approach is the simplicity involved in designing a DIC, which only requires some additional resistors and a capacitor in order to perform the conversion. The main drawback is the time needed for this conversion, which is given by the sum of up to three capacitor charge times and their associated discharge times. This article presents a modification of the most widely used estimation method in a resistive DIC, which is known as the Two-Point Calibration Method (TPCM), in which a single additional programmable digital device pin in the DIC and one extra measurement in each discharge cycle, made without slowing down the cycle, allow charge times to be reduced more than 20-fold to values around 2 µs. The new method designed to achieve this reduction only penalizes relative errors with a small increase of between 0.2% and 0.3% for most values in the tested resistance range.

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“…EADING sensors through a time-to-digital converter (TDC) instead of an analog-to-digital converter (ADC) has several advantages, for instance: (1) in microcontroller-based designs, the current consumption of an embedded TDC is clearly lower than that of an ADC; and (2) in integrated designs, the layout area occupied by a TDC is one or two orders of magnitude smaller than that required by an ADC. Accordingly, timer-based circuits for resistive [1]- [3], capacitive [4], [5], inductive [6], [7], and voltage-output [8], [9] sensors have been extensively analyzed and developed in the last decade. For the case of voltage-output sensors, usually it is assumed that the sensor provides a quasi-static analog output voltage [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Rail-to-Rail Timer-Based Demodulator for AM Sensor Signals

Reverter

2019

IEEE Trans. Instrum. Meas.

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This paper proposes a novel timer-based demodulator for low-frequency amplitude-modulated (AM) sensor signals with a rail-to-rail operating range. The demodulator extracts the amplitude of the AM signal by measuring the period of a reference signal that is altered by the AM signal itself, as already suggested in a previous paper. The rail-to-rail operation, which is the main contribution of the novel circuit, is achieved by simply but cleverly incorporating a multiplexer that enables the comparison between the two signals (reference and AM) just at the beginning and at the end of the period measurement. This new topology offers an operating range that is up to more than four times wider than that reported in the literature. The input-output characteristic in such a wider operating range is not linear, but it can be accurately modelled by a second-degree polynomial.

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Improved Single-Element Resistive Sensor-to-Microcontroller Interface

Cited by 68 publications

References 12 publications

Toward Non-CPU Activity in Low-Power MCU-Based Measurement Systems

Toward Non-CPU Activity in Low-Power MCU-Based Measurement Systems

Reducing Measurement Time in Direct Interface Circuits for Resistive Sensor Readout

Rail-to-Rail Timer-Based Demodulator for AM Sensor Signals

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