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1. (WO2016057566) INTEGRATED CIRCUIT WITH EXTERNAL RESISTANCE DETECTION

Pub. No.:    WO/2016/057566    International Application No.:    PCT/US2015/054309
Publication Date: Fri Apr 15 01:59:59 CEST 2016 International Filing Date: Wed Oct 07 01:59:59 CEST 2015
IPC: H03K 19/0175
G05F 1/618
Applicants: TEXAS INSTRUMENTS INCORPORATED
TEXAS INSTRUMENTS JAPAN LIMITED
Inventors: SILVA, Faruk, Jose Nome
Title: INTEGRATED CIRCUIT WITH EXTERNAL RESISTANCE DETECTION
Abstract:
In described examples, a power supply circuit is configured to control an output voltage (Vout) based on detecting whether an external resistance network (Rtop/Rbot) is connected to an input pin (210). The power supply circuit is configured to control the output voltage (Vout) based on a voltage measured at the input pin (210), where the voltage at the input pin (210) is used for providing a feedback voltage in a control loop (235, 225). Based on the voltage at the input pin (210), the power supply circuit is configured to detect the existence of a resistance network external to the single input pin (210). If the external resistance network is detected, the power supply circuit is configured to generate the output voltage (Vout) based on a feedback voltage generated by the external resistance network (Rtop/Rbot) at the input pin (210). If no external resistance network is detected, the power supply circuit is configured to generate the output voltage (Vout) based on a feedback voltage generated by an internal resistance network (Rtopint/Rbotint).