Frequency diverse e-pen for touch sensor and e-pen systems

Abstract

An e-pen includes e-pen sensor electrodes (including a first and a second e-pen sensor electrode) and drive-sense circuits (DSCs) (including a first DSC and a second DSC. The first DSC drives a first e-pen signal having a first frequency via a first single line coupling to the first e-pen sensor electrode and simultaneously senses, via the first single line, the first e-pen signal. Based on e-pen/touch sensor device interaction, the first e-pen signal is coupled into at least one touch sensor electrode of the touch sensor device. The first DSC process the first e-pen signal to generate a first digital signal representative of a first electrical characteristic of the first e-pen sensor electrode. Similarly, the second DSC drives a second e-pen signal having a second frequency via a second single line coupling to the second e-pen sensor electrode and simultaneously senses, via the second single line, the second e-pen signal.

What is claimed is: 
     
         1 . A system including an electronic pen (e-pen) and a touch sensor device (TSD) comprising:
 the TSD including:
 a touch sensor electrode; and 
 a first drive-sense circuit (DSC) operably coupled to the touch sensor electrode, wherein, when enabled, the first DSC configured to drive a touch sensor signal having a first frequency via a first single line coupling to the touch sensor electrode, wherein based on interaction of the e-pen with the touch sensor device, the touch sensor signal is coupled into an e-pen sensor electrode of the e-pen; and 
   the e-pen including:
 the e-pen sensor electrode; and 
 a second DSC operably coupled to the e-pen sensor electrode, wherein, when enabled, the second DSC configured to:
 drive an e-pen signal having a second frequency via a second single line coupling to the e-pen sensor electrode and simultaneously sense, via the second single line, change of the e-pen signal including sensing the touch sensor signal coupled from touch sensor electrode into the e-pen sensor electrode; and 
 process the change of the e-pen signal to generate a digital signal that is representative of an electrical characteristic of the e-pen sensor electrode. 
 
   
     
     
         2 . The system of  claim 1 , wherein, when enabled, the first DSC of the TSD configured to:
 drive the touch sensor signal having the first frequency via the first single line coupling to the touch sensor electrode and simultaneously sense, via the first single line, change of the touch sensor signal; and   process the change of the touch sensor signal to generate another digital signal that is representative of an electrical characteristic of the touch sensor electrode.   
     
     
         3 . The system of  claim 2 , wherein the TSD further comprising:
 a memory that stores operational instructions; and   a processing module operably coupled to the first DSC and to the memory, wherein, when enabled, the processing module configured to execute the operational instructions to process the another digital signal to detect the interaction of the e-pen with the TSD.   
     
     
         4 . The system of  claim 1 , wherein the e-pen further comprising:
 a memory that stores operational instructions; and   a processing module operably coupled to the second DSC and to the memory, wherein, when enabled, the processing module configured to execute the operational instructions to process the digital signal to detect the interaction of the e-pen with the TSD.   
     
     
         5 . The system of  claim 1 , wherein the e-pen is tethered to the TSD, and the second DSC is powered by the TSD. 
     
     
         6 . The system of  claim 1 , wherein the e-pen is a wireless e-pen. 
     
     
         7 . The system of  claim 1 , wherein the second DSC further comprising:
 a power source circuit operably coupled to the e-pen sensor electrode via the second single line, wherein, when enabled, the power source circuit configured to provide the e-pen signal that includes an analog signal via the second single line coupling to the e-pen sensor electrode, and wherein the analog signal includes at least one of a DC (direct current) component or an oscillating component; and   a power source change detection circuit operably coupled to the power source circuit, wherein, when enabled, the power source change detection circuit is configured to:
 detect an effect on the analog signal that is based on the electrical characteristic of the e-pen sensor electrode; and 
 generate the digital signal that is representative of the electrical characteristic of the e-pen sensor electrode. 
   
     
     
         8 . The system of  claim 7 , wherein the second DSC further comprising:
 the power source circuit including a power source to source at least one of a voltage or a current to the e-pen sensor electrode via the second single line; and   the power source change detection circuit including:
 a power source reference circuit configured to provide at least one of a voltage reference or a current reference; and 
 a comparator configured to compare the at least one of the voltage or the current provided to the e-pen sensor electrode to the at least one of the voltage reference or the current reference in accordance with producing the analog signal. 
   
     
     
         9 . A system including an electronic pen (e-pen) and a touch sensor device (TSD) comprising:
 the TSD operably coupled and configured to drive an touch sensor signal having a first frequency to a touch sensor electrode of the TSD, wherein based on interaction of the e-pen with the TSD, the touch sensor signal is coupled from the touch sensor electrode of the TSD into an e-pen sensor electrode of the e-pen; and   the e-pen including a drive-sense circuit (DSC) operably coupled to the e-pen sensor electrode of the e-pen, wherein, when enabled, the DSC configured to:
 drive a e-pen signal having a second frequency via a single line coupling to the e-pen sensor electrode of the e-pen and simultaneously sense, via the single line, change of the e-pen signal including sensing the touch sensor signal coupled from the touch sensor electrode of the TSD into the e-pen sensor electrode of the e-pen; and 
 process the change of the e-pen signal to generate a digital signal that is representative of an electrical characteristic of the e-pen sensor electrode. 
   
     
     
         10 . The system of  claim 9 , wherein the TSD further comprising:
 another DSC operably coupled to the touch sensor electrode of the TSD, wherein, when enabled, the another DSC configured to drive the touch sensor signal having the first frequency via another single line coupling to the touch sensor electrode of the TSD.   
     
     
         11 . The system of  claim 9 , wherein the e-pen further comprising:
 a memory that stores operational instructions; and   a processing module operably coupled to the DSC and to the memory, wherein, when enabled, the processing module configured to execute the operational instructions to process the digital signal to detect the interaction of the e-pen with the TSD.   
     
     
         12 . The system of  claim 9 , wherein the e-pen is a wireless e-pen. 
     
     
         13 . The system of  claim 9 , wherein the DSC further comprising:
 a power source circuit operably coupled to the e-pen sensor electrode via the single line, wherein, when enabled, the power source circuit configured to provide the e-pen signal that includes an analog signal via the single line coupling to the touch sensor electrode, and wherein the analog signal includes at least one of a DC (direct current) component or an oscillating component; and   a power source change detection circuit operably coupled to the power source circuit, wherein, when enabled, the power source change detection circuit is configured to:
 detect an effect on the analog signal that is based on the electrical characteristic of the e-pen sensor electrode; and 
 generate the digital signal that is representative of the electrical characteristic of the e-pen sensor electrode. 
   
     
     
         14 . The system of  claim 13 , wherein the DSC further comprising:
 the power source circuit including a power source to source at least one of a voltage or a current to the e-pen sensor electrode via the single line; and   the power source change detection circuit including:
 a power source reference circuit configured to provide at least one of a voltage reference or a current reference; and 
 a comparator configured to compare the at least one of the voltage or the current provided to the e-pen sensor electrode to the at least one of the voltage reference or the current reference in accordance with producing the analog signal. 
   
     
     
         15 . A system including an electronic pen (e-pen) and a touch sensor device (TSD) comprising:
 the TSD operably coupled and configured to drive a touch sensor signal having a first frequency, wherein based on interaction of the e-pen with the TSD, the touch sensor signal is coupled into an e-pen sensor electrode of the e-pen; and   the e-pen including a drive-sense circuit (DSC) operably coupled to the e-pen sensor electrode of the e-pen, wherein, when enabled, the DSC configured to:
 drive an e-pen signal having a second frequency via a single line coupling to the e-pen sensor electrode of the e-pen and simultaneously sense, via the single line, change of the e-pen signal including sensing the touch sensor signal coupled from the TSD into the e-pen sensor electrode of the e-pen; and 
 process the change of the e-pen signal to generate a digital signal that is representative of an electrical characteristic of the e-pen sensor electrode. 
   
     
     
         16 . The system of  claim 15 , wherein the TSD further comprising:
 another DSC operably coupled to a touch sensor electrode of the TSD, wherein, when enabled, the another DSC configured to drive the touch sensor signal having the first frequency via another single line coupling to the touch sensor electrode of the TSD.   
     
     
         17 . The system of  claim 15 , wherein the e-pen further comprising:
 a memory that stores operational instructions; and   a processing module operably coupled to the DSC and to the memory, wherein, when enabled, the processing module configured to execute the operational instructions to process the digital signal to detect the interaction of the e-pen with the TSD.   
     
     
         18 . The system of  claim 15 , wherein the e-pen is a wireless e-pen. 
     
     
         19 . The system of  claim 15 , wherein the DSC further comprising:
 a power source circuit operably coupled to the e-pen sensor electrode via the single line, wherein, when enabled, the power source circuit configured to provide the e-pen signal that includes an analog signal via the single line coupling to the e-pen sensor electrode, and wherein the analog signal includes at least one of a DC (direct current) component or an oscillating component; and   a power source change detection circuit operably coupled to the power source circuit, wherein, when enabled, the power source change detection circuit is configured to:
 detect an effect on the analog signal that is based on the electrical characteristic of the e-pen sensor electrode; and 
 generate the digital signal that is representative of the electrical characteristic of the e-pen sensor electrode. 
   
     
     
         20 . The system of  claim 19 , wherein the DSC further comprising:
 the power source circuit including a power source to source at least one of a voltage or a current to the e-pen sensor electrode via the single line; and   the power source change detection circuit including:
 a power source reference circuit configured to provide at least one of a voltage reference or a current reference; and 
 a comparator configured to compare the at least one of the voltage or the current provided to the e-pen sensor electrode to the at least one of the voltage reference or the current reference in accordance with producing the analog signal.