PAD
Cell
PAD_In
Vpad shorten case
pull up
switch from Vss output
to input with pull-up enable
Vss
Vpad
iben 0->1
oben 1->0
V
SS
V
SS
V
SS
V
SS
pull up
pull up
pull up
pull up
pull up
V
DD
t
Vt
V
dd
If there’s any short case between BP and FP, V
pad
will be shorten to V
SS
and never be pulled up.
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
shorten
case
Figure 57-35. Pullup fault detect in connection/segment short case
This circuit works by measuring the capacitance of the LCD frontplane (FP) or backplane
(BP) connection and comparing it to a reference number. This reference number is
usually measured at the user's production facility (by this circuit) and stored for later
comparison in the flash. The comparison must account for fluctuations due to
temperature, voltage, and other environmental effects. Intelligent software may be able to
account for these effects more accurately by using time-dependent algorithms; but the
basic comparison to a factory-measured number should be sufficient for most
applications.
This circuit can measure the following:
• FP or BP rise time response changes, including pad, pin, board, and all pixels
connected to the measured FP or BP.
Chapter 57 LCD Controller (SLCD)
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
1783
Содержание K53 Series
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