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DA852x-UG02-608 Page 14 of 47
User Guide Release 2.0
DA852X E Ink Evaluation Kit
Display Controllers
Figure 4.
Parameter Control Panel
The user is able to adjust display control timings, and activate the charge pump for a longer period to make
measurements etc.
Clock Period
This adjusts the timing of the serial interface. A clock period of 5 will result in each bit being transmitted
at a rate of 1.14Mb/s (250ns+5x125ns). The maximum rate using this software is 4Mb/s. The value
should should be adjusted to the minimum value consistent with correct transfer across the hardware.
Standby Delay
This adjusts the amount of time that the 15volt generator is allowed to charge to its final value before
data is sent and the display is enabled. A typical figure is 20ms for VDD=3.3v. It is only required that
the output voltage has reached its working voltage before the display is enabled. This can be verified
on an oscilloscope by monitoring pins BLANK and V15_OUT.
Standby Extend This adjusts the amount of time that the 15v generator is enabled after the transition is complete. This
should be small, and can usually be zero to conserve power.
Sequence Update Rate
This sets the rate at which new sequences are displayed when in “Loop” mode. This control
can be updated from within sequence files (see Section “The Slide File “).
StandbyB
Switching this to the “Always On” position allows the charge pump to be enabled for the period shown
in the box below. It will revert back at the end of the period. This is for protection of any attached
display, to avoid power being applied for a prolonged period. This control is only used during
development, investigating parameters such as the level of 15v ripple.
