DLPR410: A full park sequence

Hello.

The DLPR410 [DLPC410] through version 5 had a power down park sequence (PWR_FLOAT) and a “mirror float” (recoverable flat state) command for the DLP7000 and DLP9500 DMDs. 

• The PWR_FLOAT was designed for emergency shut down on loss of power or in preparation for a controlled shut down. Once asserted it performs park pulses and the logic dead ends with no recovery possible without either a full logic reset of the DLPC410 or a power cycle.
• The “mirror float” simply turned the mirror voltage to 0 V or V_offset and returned it to V_bias when operation was resumed.
• In both cases RST_ACTIVE was asserted during the operation:
  • For PWR_FLOAT, once asserted RST_ACTIVE remains asserted until the system is logic reset or power cycled.
  • For “mirror float” it was asserted for 4.5 ms as set in a ROM table in the DLPC410

DLPR410A v7 added support for the DLP650LNIR DMD. However, inadvertently the RST_ACTIVE assertion was eliminated for both PWR_FLOAT and “mirror float”.  Some customers rely on this signal to tell them when a reset or park pulses are active.

The DLPR410B firmware moves the functionality back to the DLPR410 v5 operation, please adds a few timing adjustments that are required to meet the proper floating of the mirrors either before shutdown or  recoverable “mirror float” operation.

Please let us know if this explains the changes.

Thank you,

Matt