PCF85134HL-1 NXP [NXP Semiconductors], PCF85134HL-1 Datasheet - Page 19

• Manufacturer Part Number: PCF85134HL-1
• Description: Universal LCD driver for low multiplex rates
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCF85134_1
Product data sheet
Table 7.
An additional feature is for an arbitrary selection of LCD segments to blink. This applies to
the static and 1:2 multiplex drive modes and can be implemented without any
communication overheads. By means of the output bank selector, the displayed RAM
banks are exchanged with alternate RAM banks at the blink frequency. This mode can
also be specified by the blink-select command.
In the 1:3 and 1:4 multiplex modes, where no alternate RAM bank is available, groups of
LCD segments can blink by selectively changing the display RAM data at fixed time
intervals.
The entire display can blink at a frequency other then the nominal blink frequency. This
can be effectively performed by resetting and setting the display enable bit E at the
required rate using the mode-set command (see
Blink mode
off
1
2
3
Blink frequencies
Operating mode ratio
-
---------
----------- -
1536
----------- -
3072
768
f
f
f
clk
clk
clk
Rev. 01 — 17 December 2009
Blink frequency with respect to f
f
blinking off
2.5
1.3
0.6
clk
= 1.970 kHz
Universal LCD driver for low multiplex rates
Table
10).
PCF85134
clk
© NXP B.V. 2009. All rights reserved.
(typical)
19 of 40
Unit
Hz
Hz
Hz
Hz