CONFIGURABLE LIGHT SOURCE DRIVER DEVICE

摘要

A configurable light source driver device includes circuitry that detects the presence of a resistor when connected to a terminal of the device and automatically configures the device to operate as a differential driver circuit with low EMI emission and a level of circuit stability that is selected on the basis of parasitic impedance conditions of the differential driver circuit. When the terminal is left unconnected, the configurable light source driver device automatically configures itself to operate as a single ended driver circuit with low power consumption and a different level of circuit stability that is selected on the basis of parasitic impedance conditions of the single ended driver circuit. Furthermore, the configurable light source driver device can include a pulse width adjustment circuit for modifying certain operating characteristics of each of the differential driver circuit and the single ended driver circuit.

主权项

1. An integrated circuit comprising:
a first externally-accessible terminal; a second externally-accessible terminal; a resistor presence detector circuit; a first switch operable to draw a first pulsed current through a light source coupled to the first externally-accessible terminal; and a second switch operable to draw a second pulsed current through a resistor when the resistor presence detector circuit detects coupling of the resistor to the second externally-accessible terminal and places the integrated circuit in a differential driver circuit mode of operation.