PC85132/232-1 データシートの表示（PDF） - NXP Semiconductors.
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PC85132/232-1 Datasheet PDF : 65 Pages
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NXP Semiconductors
PCA85132
LCD driver for low multiplex rates
7.1.6.5 Command: frequency-ctrl
Table 12. Frequency-ctrl - command bit description
Bit
Symbol
Value
Description
Equation
Nominal Nominal
clock
frame
frequency[1] frequency[1]
7 to 4 -
1110 1
fixed value
3 to 0 F[2:0]
defines the division factor
000
fclkint
=
6---4--
80
fosc
1440 Hz
60 Hz
001
fclkint
=
6---4--
74
fosc
1557 Hz
65 Hz
010
fclkint
=
6---4--
68
fosc
1694 Hz
70 Hz
011[2], 111
fclkint = fosc
1800 Hz
75 Hz
100
fclkint
=
6---4--
60
fosc
1920 Hz
80 Hz
101
fclkint
=
6---4--
56
fosc
2057 Hz
85 Hz
110
fclkint
=
6---4--
53
fosc
2174 Hz
90 Hz
[1] Calculated with the oscillator frequency of fosc = 1.800 Hz. The frame frequency is derived from the internal
clock frequency by Equation 1.
[2] Default value.
7.1.6.6 Blinking
The display blinking capabilities of the PCA85132 are very versatile. The whole display
can blink at frequencies selected by the blink-select command (see Table 11). The blink
frequencies are derived from the clock frequency (fclk). The ratios between the clock and
blink frequencies depend on the blink mode in which the device is operating (see
Table 13).
Table 13. Blink frequencies
Assuming that fclk = 1.800 kHz.
Blink mode
Operating mode ratio
off
-
1
fblink
=
-f--c--l--k-
768
2
fblink
=
--f--c---l-k---
1536
3
fblink
=
--f--c---l-k---
3072
Blink frequency
blinking off
~2.34 Hz
~1.17 Hz
~0.59 Hz
An additional feature is for an arbitrary selection of LCD elements to blink. This applies to
the static and 1:2 multiplex drive modes and can be implemented without any
communication overheads: With the output bank selector, the displayed RAM banks are
PCA85132
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 9 April 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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