公开(公告)号：US11967816B2

公开(公告)日：2024-04-23

申请号：US17244692

申请日：2021-04-29

Applicant: Texas Instruments Incorporated

Inventor： Ishaan Kubba ,  Sreeram Nasum Subramanyam ,  Shishir Goyal ,  Deep Banerjee

IPC: H02H3/00 ,  H03K5/01 ,  H03K5/24

CPC classification number: H02H3/003 ,  H03K5/01 ,  H03K5/24

Abstract: An input/output (I/O) interface includes a resistance-to-current (R/I) converter; an internal resistor; first, second, and third current sources; first and second diodes; and a comparator. The R/I converter is coupled to an I/O pin and generates an output current based on an external resistance at the I/O pin during an analog operating mode. The internal resistor is coupled to the I/O pin and to ground. The first current source is coupled to the R/I converter circuit. The first diode is coupled to the R/I converter and to the I/O pin. The second current source is coupled to the R/I converter and the first diode and to ground. The second diode is coupled to the I/O pin and to the third current source. The comparator has inputs coupled to the I/O pin and to a reference voltage, and outputs a control signal indicative of a digital operating mode.