公开(公告)号：US11275100B2

公开(公告)日：2022-03-15

申请号：US16781598

申请日：2020-02-04

Applicant: STMicroelectronics S.r.l.

Inventor： Michele Vaiana ,  Calogero Marco Ippolito ,  Angelo Recchia ,  Antonio Cicero ,  Pierpaolo Lombardo

IPC: H03F1/02 ,  G01R19/00 ,  G05F3/08 ,  H03B5/04 ,  H03F3/45

Abstract: An amplification interface includes an input terminal receiving a sensor current and an output terminal supplying an output voltage. An analog integrator is connected to the input terminal and supplies the output voltage. A current generator is connected to the input of the analog integrator and generates a compensation current based on a drive signal. A control circuit generates the drive signal for the current generator based on a control signal representing an offset in the sensor current supplied by the sensor. The current generator generates, based on the driving signal, a positive or negative current. The control circuit determines a first duration and a second duration as a function of the control signal representing the offset in the sensor current, during the measurement interval, and sets the driving signal to a first logic value for the first duration and to a second logic value for the second duration.

公开(公告)号：US20210011569A1

公开(公告)日：2021-01-14

申请号：US17038546

申请日：2020-09-30

Applicant: STMicroelectronics S.r.l.

Inventor： Calogero Marco Ippolito ,  Angelo Recchia ,  Antonio Cicero ,  Pierpaolo Lombardo ,  Michele Vaiana

IPC: G06F3/045 ,  G06F3/041 ,  G01R31/28 ,  G09G3/00

Abstract: A touchscreen resistive sensor includes a network of resistive sensor branches coupled to a number of sensor nodes arranged at touch locations of the touchscreen. A test sequence is performed by sequentially applying to each sensor node a reference voltage level, jointly coupling to a common line the other nodes, sensing a voltage value at the common line, and declaring a short circuit condition as a result of the voltage value sensed at the common line reaching a short circuit threshold. A current value level flowing at the sensor node to which the reference voltage level is applied is sensed and a malfunction of the resistive sensor branch coupled with the sensor node to which a reference voltage level is applied is generated as a result of the current value sensed at the sensor node reaching an upper threshold or lower threshold.

公开(公告)号：US10193581B2

公开(公告)日：2019-01-29

申请号：US15468306

申请日：2017-03-24

Applicant: STMicroelectronics S.r.l.

Inventor： Egidio Ragonese ,  Nunzio Spina ,  Alessandro Parisi ,  Pierpaolo Lombardo ,  Nunzio Greco ,  Giuseppe Palmisano

IPC: H04B1/10 ,  H01F19/04 ,  H03F3/45 ,  H04L25/02 ,  H01F19/08

Abstract: A galvanic isolation circuit is formed by a differential transformer having primary and secondary windings for transmission of signals over a carrier between the primary and the secondary windings of the transformer. A galvanic isolation oxide layer is provide between the primary and secondary windings. Each winding includes include a center tap providing a low-impedance paths for dc and low frequency components of common-mode currents through the differential transformer. A pass-band stage is coupled to the secondary winding of the transformer and configured to permit propagation of signals over said carrier through the pass-band amplifier stage while providing for a rejection of common-mode noise.