Patent ID: 11967816
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A circuit having an I/O pin adapted to be coupled to an external resistor having an external resistance, comprising:
a resistance-to-current (R/I) converter coupled to the I/O pin and including:
an error amplifier having a positive input coupled to the I/O pin, a negative input coupled to a first reference voltage, and an output;
a first compensation loop coupled to the output of the error amplifier;
a second compensation loop coupled to the output of the error amplifier; and
a current mirror coupled to the output of the error amplifier and having an analog control signal output;

an internal resistor coupled to the I/O pin and to ground;
a first current source coupled to the current mirror;
a first diode coupled to the current mirror and to the I/O pin;
a second current source coupled to the current mirror and the first diode and to ground;
a second diode coupled to the I/O pin;
a third current source coupled to the second diode; and
a comparator having a positive input coupled to the I/O pin, a negative input coupled to a second reference voltage, and a digital control signal output.