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

Claim 0:
1. A circuit having an input terminal adapted to be coupled to an external resistor having an external resistance, comprising:
a resistance-to-current (R/I) converter circuit coupled to the input terminal and having a generated current output having a generated current based on the external resistance;
an internal resistor coupled to the input terminal and to ground;
a first current source coupled to the R/I converter circuit and operable to supply a first current;
a first diode coupled to the R/I converter circuit and to the input terminal;
a second current source coupled to the R/I converter circuit and the first diode and to ground, the second current source operable to supply a second current;
a second diode coupled to the input terminal;
a third current source coupled to the second diode and having an operable to supply a third current; and
a comparator having a positive input coupled to the input terminal, a negative input coupled to a reference voltage, and a control signal output indicative of an operating mode.