Patent ID: 7333313
Filing Date: 2008-02-19
Classification: H05B

Abstract:
1. A ballast for a high-intensity discharge (HID) lamp, comprising: HID lamp ballast circuitry that includes a microcontroller having a first analog to digital input/output pin, a second analog to digital input/output pin, and a multifunction pin; a temperature measurement circuit that includes a thermistor to sense a temperature, said temperature measurement circuit being connected to said second analog to digital input/output pin; a further circuit connected to said first analog to digital input/output pin; and a switch connected to said multifunction pin, said temperature measurement circuit and said further circuit, said switch connecting said temperature measurement circuit to said multifunction pin in a first position and disconnecting said temperature measurement circuit from said multifunction pin in a second position, wherein said temperature measurement circuit is activated when said switch is in the first position and said further circuit is operated and said temperature measurement circuit is deactivated when said switch is in the second position.