Patent ID: 8723149
Filing Date: 2014-05-13
Classification: G01J,G01S,G01V

Abstract:
1. A monitoring and control circuit comprising: a light-emitting diode (LED) driver including a control input, an output, and a node, wherein the output is coupled to an LED; a multiplexer coupled to the node of the LED driver; an analog-to-digital converter coupled to the multiplexer; and a controller coupled to the analog-to-digital converter and to the control input of the LED driver; wherein the LED driver is coupled to drive the output to illuminate the LED with a first voltage supply, wherein a second voltage supply is coupled to drive the controller, and wherein the second voltage supply is a controlled voltage derivation of the first voltage supply; wherein the LED driver comprises a voltage protection transistor in series with a current setting transistor, wherein the output of the LED driver is coupled to a drain of the voltage protection transistor, wherein the node of the LED driver is coupled to a drain of the current setting transistor.