PCF8577CT/3,118 データシートの表示（PDF） - NXP Semiconductors.

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PCF8577CT/3,118

LCD direct/duplex driver with I²C-bus interface

NXP Semiconductors. 

NXP Semiconductors

PCF8577C

LCD direct/duplex driver with I²C-bus interface

The control register also has two display control bits. These bits are named MODE and

BANK. The MODE bit selects whether the display outputs are configured for direct or

duplex drive displays. The BANK bit allows the user to display BANK A or BANK B.

7.4 Auto-incremented loading

After each segment byte is loaded, the SBV is incremented automatically. Thus

auto-incremented loading occurs if more than one segment byte is received in a data

transfer.

Since the SBV addresses both device and segment registers in all addressed chips,

auto-incremented loading may proceed across device boundaries if the hardware

subaddresses are arranged contiguously.

7.5 Direct drive mode

The PCF8577C is set to the direct drive mode by loading the MODE control bit with

logic 0. In this mode, only four bytes are required to store the data for the 32 segment

drivers. Setting the BANK bit to logic 0 selects even bytes (BANK A), setting the BANK bit

to logic 1 selects odd bytes (BANK B).

In the direct drive mode, the SBV is auto-incremented by two after the loading of each

segment byte register. This means, that auto-incremented loading of BANK A or BANK B

is possible. Either bank may be completely or partially loaded irrespective of which bank is

being displayed. Direct drive output waveforms are shown in Figure 4.

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Von(RMS) = VDD  VSS; Voff(RMS) = 0.

Fig 4. Direct drive mode display output waveforms

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7.6 Duplex mode

The PCF8577C is set to the duplex mode by loading the MODE bit with logic 1. In this

mode, a second backplane signal (BP2) is needed and pin A2/BP2 is used for this;

therefore A2 and its equivalent SBV bit V5 are undefined. The SBV auto-increments by

one between loaded bytes.

All of the segment bytes are required to store data for the 32 segment drivers and the

BANK bit is ignored.

PCF8577C

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 5 — 10 October 2014

© NXP Semiconductors N.V. 2014. All rights reserved.

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