Abstract:
A method for determining the position (O) of a contact on a panel (2) envisages, during a detection operation, detecting vibration signals at a plurality of detection areas fixed with respect to the panel as a function of vibrations generated by the contact; determining detection values of temporal differences (Δtf) between times of detection of the vibrations at pairs of said detection areas; and determining the position of the contact as a function of said temporal differences. A characterization operation, preceding that of detection, envisages defining contact areas (key1-keyn) on the panel (2) and associating to these contact areas respective ranges of admissible values for the temporal differences (Δtf). In order to determine the position of the contact in a given contact area, the membership of the detection values of the temporal differences to the respective ranges of admissible values of the given contact area is verified.
Abstract:
Described herein is a method for biasing an EEPROM array (10) formed by memory cells (2) arranged in rows and columns, each operatively coupled to a first switch (3) and to a second switch (4) and having a first current-conduction terminal selectively connectable to a bitline (BL) through the first switch (3) and a control terminal selectively connectable to a gate-control line (Cgt) through the second switch (4), wherein associated to each row are a first wordline (WL seltr) and a second wordline (WL bsw), connected to the control terminals of the first switches (3) and, respectively, of the second switches (4) operatively coupled to the memory cells (2) of the same row. The method envisages selecting at least one memory cell (2) for a given memory operation, biasing the first wordline and the second wordline of the row associated thereto, and in particular biasing the first and second wordlines with voltages different from one another and having values that are higher than an internal supply voltage (V DD ) and are a function of the given memory operation.
Abstract:
A method and apparatus for programming a phase change memory cell (2) is disclosed. A phase change memory cell (2) includes a memory element (10) of a phase change material having a first state ("11"), in which the phase change material is crystalline and has a minimum resistance level, a second state ("00") in which the phase change material is amorphous and has a maximum resistance level, and a plurality of intermediate states with resistance levels there between. The method includes using programming pulses to program the phase change memory cell (2) in either the set, reset, or one of the intermediate states. To program in the intermediate states, a programming pulse creates a crystalline percolation path having an average diameter (D) through amorphous phase change material and a second programming pulse modifies the diameter (D) of the crystalline percolation path to program the phase change memory cell to the proper current level.