The DMD features a built-in thermal diode that measures the temperature at one corner of the die outside the micromirror array. The thermal diode can be interfaced with the TMP411 temperature sensor as shown in Figure 8-3. The serial bus from the TMP411 can be connected to the DLPC4420 display controller to enable its temperature sensing features. See the DLPC4420 Programmers’ Guide for instructions on installing the DLPC4420 controller support firmware bundle and obtaining the temperature readings.

The software application contains functions to configure the TMP411 to read the DMD temperature sensor diode. This data can be leveraged to incorporate additional functionality in the overall system design such as adjusting illumination, fan speeds, and so forth. All communication between the TMP411 and the DLPC4420 controller will be completed using the I²C interface. The TMP411 connects to the DMD via pins B17 and B18 as outlined in Pin Configuration and Functions.

A. Details omitted for clarity, see the TI Reference Design for connections to the DLPC4420 controller.

B. See the TMP411 data sheet for system board layout recommendation.

C. See the TMP411 data sheet and the TI reference design for suggested component values for R1, R2, R3, R4, and C1.

D. R5 = 0 Ω. R6 = 0 Ω. Zero ohm resistors need to be located close to the DMD package pins.

Figure 8-3 TMP411 Sample Schematic