Multiplexer for a TX/RX capacitance sensing panel
First Claim
Patent Images
1. A multiplexer circuit, comprising:
- a plurality of PTOTAL receive (RX) channel outputs coupled with a plurality of mutual capacitance sensing channels, wherein PTOTAL is a total number of the RX channel outputs;
a plurality of switches coupled to the plurality of RX channel outputs; and
a plurality of QTOTAL pins, wherein QTOTAL is a total number of the pins, each of the plurality of pins is coupled to a respective one of a plurality of sensor electrodes at a first end and a respective one of the plurality of switches at a second end, and QTOTAL is greater than PTOTAL, wherein each of a first subset and a third subset of the plurality of QTOTAL pins is switchably coupled to at least a respective one of the plurality of RX channel outputs, and wherein for each possible subset of PTOTAL contiguous pins from the plurality of QTOTAL pins, each pin in the respective possible subset is switchably coupled to a respective different RX channel output of the plurality of RX channel outputs.
6 Assignments
0 Petitions
Accused Products
Abstract
An embodiment of a multiplexer circuit may include a plurality of PTOTAL receive (RX) channel outputs and a plurality of QTOTAL pins, where QTOTAL is greater than PTOTAL. Each of a first subset and a third subset of the plurality of QTOTAL pins may be switchably coupled to at least one of the plurality of RX channels, each of a second subset of the plurality of QTOTAL pins is switchably coupled to two of the plurality of RX channels, and for each possible subset of PTOTAL contiguous pins from the plurality of QTOTAL pins, each pin in the possible subset may be switchably coupled to a different RX channel output of the plurality of RX channel outputs.
-
Citations
20 Claims
-
1. A multiplexer circuit, comprising:
-
a plurality of PTOTAL receive (RX) channel outputs coupled with a plurality of mutual capacitance sensing channels, wherein PTOTAL is a total number of the RX channel outputs; a plurality of switches coupled to the plurality of RX channel outputs; and a plurality of QTOTAL pins, wherein QTOTAL is a total number of the pins, each of the plurality of pins is coupled to a respective one of a plurality of sensor electrodes at a first end and a respective one of the plurality of switches at a second end, and QTOTAL is greater than PTOTAL, wherein each of a first subset and a third subset of the plurality of QTOTAL pins is switchably coupled to at least a respective one of the plurality of RX channel outputs, and wherein for each possible subset of PTOTAL contiguous pins from the plurality of QTOTAL pins, each pin in the respective possible subset is switchably coupled to a respective different RX channel output of the plurality of RX channel outputs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A multiplexer circuit, comprising:
-
a plurality of PTOTAL receive (RX) channel outputs, wherein PTOTAL is a total number of the RX channel outputs; a plurality of switches coupled to the plurality of RX channel outputs; and a plurality QTOTAL of pins, wherein QTOTAL is a total number of the pins, each of the plurality of pins is coupled to one of a plurality of sensor electrodes at a first end and one of the plurality of switches at a second end, the plurality of pins includes; a first subset of pins in a first mapping region, wherein each of the first subset of pins is switchably connected to a respective one of the plurality of RX channel outputs according to a first mapping order; and a third subset of pins in a third mapping region, wherein each of the third subset of pins is switchably connected to a respective one or more of the plurality of RX channel outputs according to the first mapping order and a second mapping order. - View Dependent Claims (11, 12, 13, 14, 15)
-
-
16. A system, comprising:
-
a mutual capacitance sensor, comprising; a transmit (TX) signal generator, and a plurality of PTOTAL receive (RX) channels, wherein PTOTAL is a total number of the RX channel outputs; a plurality of switches coupled to the plurality of RX channel outputs and the TX signal generator; and a plurality of QTOTAL pins, wherein QTOTAL is a total number of the pins, each of the plurality of pins is coupled to a respective one of a plurality of sensor electrodes at a first end and a respective one of the plurality of switches at a second end, and QTOTAL is greater than PTOTAL, wherein each of the pins is switchably coupled with the TX signal generator, wherein each of a first subset and a third subset of the plurality of QTOTAL pins is switchably coupled to at least a respective one of the plurality of RX channel outputs, and wherein for each possible subset of PTOTAL contiguous pins from the plurality of QTOTAL pins, each pin in the respective possible subset is switchably coupled to a respective different RX channel output of the plurality of RX channel outputs. - View Dependent Claims (17, 18, 19, 20)
-
Specification