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PCF8576D Datasheet(PDF) 20 Page - NXP Semiconductors

Part No. PCF8576D
Description  Universal LCD driver for low multiplex rates
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com

PCF8576D Datasheet(HTML) 20 Page - NXP Semiconductors

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All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 10 — 14 February 2011
20 of 50
NXP Semiconductors
Universal LCD driver for low multiplex rates
The storage arrangements described lead to extremely efficient data loading in cascaded
applications. When a series of display bytes are sent to the display RAM, automatic
wrap-over to the next PCF8576D occurs when the last RAM address is exceeded.
Subaddressing across device boundaries is successful even if the change to the next
device in the cascade occurs within a transmitted character (such as during the 14th
display data byte transmitted in 1:3 multiplex mode).
The hardware subaddress must not be changed while the device is being accessed on the
I2C-bus interface.
7.13 Output bank selector
The output bank selector selects one of the four bits per display RAM address for transfer
to the display latch. The actual bit chosen depends on the selected LCD drive mode in
operation and on the instant in the multiplex sequence.
In 1:4 mode, all RAM addresses of bit 0 are selected, these are followed by the
contents of bit 1, bit 2 and then bit 3.
In 1:3 mode, bits 0, 1 and 2 are selected sequentially
In 1:2 mode, bits 0 and 1 are selected
In static mode, bit 0 is selected
The PCF8576D includes a RAM bank switching feature in the static and 1:2 drive modes.
In the static drive mode, the bank-select command (see Section 7.17) may request the
contents of bit 2 to be selected for display instead of the contents of bit 0. In 1:2 mode, the
contents of bits 2 and 3 may be selected instead of bits 0 and 1. This gives the provision
for preparing display information in an alternative bank and to be able to switch to it once
it is assembled.
7.14 Input bank selector
The input bank selector loads display data into the display RAM in accordance with the
selected LCD drive configuration.
The bank-select command (see Section 7.17) can be used to load display data in bit 2 in
static drive mode or in bits 2 and 3 in 1:2 mode. The input bank selector functions are
independent of the output bank selector.
7.15 Blinker
The PCF8576D has a very versatile display blinking capability. The whole display can
blink at a frequency selected by the blink-select command (see Section 7.17). Each blink
frequency is a fraction of the clock frequency; the ratio between the clock frequency and
blink frequency depends on the blink mode selected (see Table 6).
An additional feature allows an arbitrary selection of LCD segments to blink 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 (see Section 7.17).

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