Electronic device with flexible data and power interface
Electronic modules with small and flexible interfaces are disclosed. One example electronic module includes a power supply terminal configured to receive power for the electronic module and circuitry configured to carry out various functions. The functions carried out by the electronic module circuitry include simultaneously receiving both of the following via the power supply terminal: a power signal for carrying out a mission mode operation of the electronic module, and a data signal.
1. A sensor module, comprising:
a voltage divider network having a first node, a second node, and a third node;
a first detector having a first input terminal, a second input terminal, and an output terminal, the first input terminal of the first detector coupled to the first node and the second input terminal of the first detector coupled for receiving a first reference voltage;
a controller having a first input terminal, a second input terminal, and a first output terminal, the first input terminal of the controller coupled to the output terminal of the first detector;
a second detector having a first input terminal, a second input terminal, and an output terminal, the first input terminal of the second detector coupled to the second node and the second input terminal of the second detector coupled for receiving a second reference voltage and the output terminal of the second detector coupled to the second input terminal of the controller;
a first transistor having a control terminal, a first current carrying terminal, and a second current carrying terminal, the first current carrying terminal of the first transistor coupled to the first input terminal of the first detector and the second current carrying terminal of the first transistor coupled to the first node;
a second transistor having a control terminal, a first current carrying terminal, and a second current carrying terminal, the first current carrying terminal of the second transistor coupled to the first input terminal of the second detector and the second current carrying terminal of the second transistor coupled to the second node;
a third transistor having a control terminal, a first current carrying terminal, and a second current carrying terminal, the control terminal of the third transistor coupled to the control terminals of the first transistor and the second transistor and to a third output terminal of the controller, the first current carrying terminal of the third transistor coupled to the first terminal of the second detector through a resistor, and the second current carrying terminal of the third transistor coupled for receiving the first source of potential;
a voltage regulator having an input terminal and an output terminal, the input terminal of the voltage regulator coupled to the third node, and the output terminal of the voltage regulator coupled to the third input terminal of the controller; and
a buffer having an input and an output, the input of the buffer coupled to the first output terminal of the controller and the output of the buffer serving as a data output terminal of the sensor module.
2. The sensor module of claim 1 , further including an asynchronous receiver coupled between the output terminal of the first detector and the first input terminal of the controller.
3. The sensor module of claim 1 , wherein the voltage divider circuit comprises a resistor divider network including:
a second resistor having a first terminal and a second terminal, the first terminal of the second resistor coupled to the input terminal of the voltage regulator to form the third node, wherein the third node serves as a multi-use terminal of the sensor module that is configured for receiving calibration data from a source external to the sensor module and receiving power;
a third resistor having a first terminal and a second terminal, the second terminal of the first resistor coupled to the first terminal of the third resistor to form the first node.
4. The sensor module of claim 1 , wherein the first detector comprises a first comparator having a noninverting input terminal, an inverting input terminal, and an output terminal, the noninverting input terminal of the first comparator serving as the first input terminal of the first detector and the inverting input terminal of the first comparator serving as the second input terminal of the first detector and the second detector comprises a second comparator having a noninverting input terminal, an inverting input terminal, and an output terminal, the noninverting input terminal of the second comparator serving as the first input terminal of the second detector and the inverting input terminal of the second comparator serving as the second input terminal of the second detector.
5. The sensor module of claim 4 , wherein the controller further includes a first input/output terminal, a second input/output terminal, and a third input/output terminal, and wherein the sensor module further includes a sensor coupled to the first input/output terminal of the controller, a data storage element coupled to the second input/output terminal of the controller, and a timer coupled to the third input/output terminal of the controller.