In free running mode the DLPC3470
controller generates an internal synchronization signal to display pre-stored
patterns. User sends an I2C command to instruct the DLPC3470 controller
to download the 1D patterns from flash memory into DLPC3470 controller’s internal
memory and begin display of the 1D patterns.
- The device displays multiple 1D patterns within an
internally-generated VSYNC period. tExposure (exposure
time), tDarkPre and tDarkPost (dark time) are equal
for all the 1D patterns within one internally generated VSYNC
frame.
- The blue LED is configured to be on for each pattern.
- TRIG_OUT_1 (Frame Trigger) is configured active high
polarity and will have a minimum pulse width of 20 microseconds. TRIG_OUT_1
delay (tD1) is configured with respect to internally generated
VSYNC.
- TRIG_OUT_2 (Pattern Trigger) is configured active high
polarity and stays active during the pattern exposure. TRIG_OUT_2 delay
(tD2) is configured with reference to the start of each
pattern.
- VSYNC is generated internally according to
different sets of patterns stored in the SPI flash memory.