Single-wire analog output sensor architecture

Abstract

The present disclosure discloses an analog integrated sensor device having an interface with only a single ground wire and a single signal wire configured to receive power and output an analog value. A power capacitor is coupled between the ground line and the single signal line. The analog sensor circuit is operable to be powered by the power capacitor and further operable to output an analog output signal on the single signal line once the power capacitor is sufficiently charged.

Description

technical field [0001] This application relates to analog sensor devices, and in particular to analog sensor devices that may be coupled with microcontrollers or detector devices. Background technique [0002] Analog sensors (eg, thermistors) are widely used in a variety of applications to measure temperature. It can be connected via a "single-wire interface" as shown in Figure 1A. However, the output of the analog sensor is non-linear, which requires an algorithm table to interpret, which is typically processed by a microcontroller coupled to a thermal resistor using one of its analog input ports. Thus, as shown in FIG. 1A , the sensor device 110 essentially consists of a thermal resistor 115 connected to an analog input port 122 of a microcontroller 120 via a so-called “single-wire” interface 130 . A "single-wire" interface actually uses two wires, where the second wire is usually coupled to ground as a reference potential. In many environments (eg a vehicle) the ground...

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Problems solved by technology

However, as can be seen in Figure 1B, such devices require at least one other pin for the power supply V

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