Interfacing with a one-wire device that is in parallel with a low-impedance element, and related systems and devices
Some embodiments of the present disclosure relate to a system that may include a replaceable module and a user device. The replaceable module may include an element and a one-wire authentication element in parallel with the element. The user device may be configured for operable coupling with the replaceable module. The user device may include a power source configured to provide power to the element, an authentication unit configured to perform a verification process for verifying authenticity of the replaceable module, and a signal conditioning unit arranged in a communication path between the one-wire authentication element and the authentication unit.
1. A system comprising:
a replaceable module comprising:
an element electrically coupled between a first line and a second line;
and a one-wire authentication element electrically in parallel with the element between the first line and the second line; wherein the element and the one-wire authentication element form a first current path and a second current path, respectively and wherein the replaceable module to divide a first current into a second current along the first current path and a third current along the second current path and wherein the third current is usable by the one-wire authentication element to modulate the first current;
and a user device to operably couple with the replaceable module, the user device comprising:
a power source to provide power to the element;
an authentication unit to perform a verification process to verify authenticity of the replaceable module; and
a signal conditioning unit arranged in a communication path between the one-wire authentication element and the authentication unit.
2. The system of claim 1 , wherein the one-wire authentication element has an impedance of at least ten times greater than an impedance of the element.
3. The system of claim 1 , wherein the replaceable module comprises:
the first line electrically coupled to a first side of the element and to an input/output pin of the one-wire authentication element; and
the second line electrically coupled to a second side of the element and to a ground pin of the one-wire authentication element.
4. The system of claim 3 , wherein the one-wire authentication element to send and receive signals at the input/output pin.
5. The system of claim 1 , wherein the one-wire authentication element to modulate the first current by altering the third current.
6. The system of claim 1 , wherein the one-wire authentication element to provide an authentication response to an authentication challenge.
7. The system of claim 1 , wherein the signal conditioning unit to receive a signal from the one-wire authentication element, condition the signal, and provide the conditioned signal to the authentication unit.
8. The system of claim 7 , wherein conditioning the signal comprises one or more of: removing an offset voltage of the signal, filtering the signal, amplifying the signal, and shaping the signal.
9. The system of claim 1 , wherein the user device comprises a switch controlled by the authentication unit and wherein the authentication unit to use the switch to allow current to flow through the replaceable module in response to verification of the authenticity of the replaceable module and wherein the authentication unit to prevent current from flowing through the replaceable module in response to failure of verification of the authenticity of the replaceable module.
10. The system of claim 1 , comprising a switch arranged to allow current to flow through the replaceable module when the switch is closed and to prevent current from flowing through the replaceable module when the switch is open, the switch controlled by the authentication unit, the authentication unit to control the switch to communicate to the one-wire authentication element.
11. The system of claim 10 , wherein the authentication unit to communicate an authentication challenge to the replaceable module by controlling the switch and the one-wire authentication element to communicate an authentication response by altering the third current.
12. The system of claim 11 , wherein the user device comprises signal-conditioning circuitry to: receive a signal from the one-wire authentication element based on the modulated first current, condition the signal, and provide the conditioned signal to the authentication unit.