PCF8533 Datasheet, PDF (17/45 Pages) NXP Semiconductors – Universal LCD driver for low multiplex rates

NXP Semiconductors
PCF8533
Universal LCD driver for low multiplex rates
An additional feature allows an arbitrary selection of LCD segments to be blinked in the
static and 1:2 drive modes. This is implemented without any communication overheads by
the output bank selector which alternates the displayed data between the data in the
display RAM bank and the data in an alternative RAM bank at the blink frequency. This
mode can also be implemented by the blink-select command.
In the 1:3 and 1:4 drive modes, where no alternate RAM bank is available, groups of LCD
elements can be blinked by selectively changing the display RAM data at fixed time
intervals.
Table 7. Blink frequencies
Blink mode
Off
1
Normal operating
mode ratio
-
-^f--^c--^l--^k-
768
2
--^f--^c---^l-^k---
1536
3
--^f--^c---^l-^k---
3072
Nominal blink frequency of f_clk Unit
typical f_clk = 1.536 kHz
blinking off
Hz
2
Hz
1
Hz
0.5
Hz
PCF8533_4
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 04 — 5 March 2010
© NXP B.V. 2010. All rights reserved.
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