Other Parts Discussed in Thread: DLP2010,
Hi All,
I am designing a projector application using the DPLC3470, DLP2010 and the DLPA2005 for high-speed 3D imaging. Most of the circuitry from the reference DLP2010 design makes sense but there are a couple of things I haven't yet figured out -- the use of DLPA2005's SENS1 and SENS2 inputs.
The reference schematic shows a thermistor and passive resistor network interfacing to the SENS2 input. So that makes sense. But I am confused by the connector J3, which presumably allows an external thermistor to monitor temperature at some other physical location. Wouldn't an external thermistor bias the resulting readings substantially lower (that without it) and distort the readings? This is quite confusing since the reference design mention any use of this connector (J3).
More confusing is the use of the SENS1 input. The literature refers to it as a light sensor input, which is for white-point correction, but again it is not used in the reference design. Further, there are two external connectors (J4, J5), I guess for photodiodes/phototransistors to monitor the projector LEDs. Since there is no mention in the documentation of how they are used, does this mean there is no monitoring of the LED drive light output? Are these optional features that typically don't need to be used?
Thanks for your help.
Best regards,
Scott