18.104.22.168 DMD Park Mode
Park Mode places the DMD in a state where the micromirrors are not biased to either the plus or the minus side, but are instead floating in an unbiased and uncontrolled state. Hence, this is also referred to as Mirror Float mode. Parking (floating) the DMD mirrors should be performed when powering down the DMD to avoid leaving a static image on the DMD during down time or storage. The mirror can be Parked in one of two ways:
- PWR_FLOAT input pin (recommended method) : asserting this input to the DLPC410 will cause the DLPC410 to automatically Park the mirrors in preparation for power removal. This operation is independent of any activity on the input data bus or Block operations. It is often best to drive this pin from both a power supervisor circuit which provides immediate DMD parking upon detecting input power removal, and from a programmable/controllable output from the customer application FPGA or processor.
- DMD Park (Float Blocks 0-15) operation per Table 14: A mirror float sequence begins with a row cycle with assertion of the proper BLK_MD and BLK_AD as described in Table 14. Following the row cycle, the DMD releases the tension under each mirror so that all mirrors relax to a relatively flat position. The float operation takes approximately 3 µs to complete, during which time RST_ACTIVE is asserted.
Park the DMD only when DC power is going to be removed from the DMD. Recovery from a PWR_FLOAT input pin assertion requires either a DLPC410 logic reset or a complete power cycle.