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PCF8577CP Datasheet(PDF) 7 Page - NXP Semiconductors |
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PCF8577CP Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 28 page  1998 Jul 30 7 Philips Semiconductors Product specification LCD direct/duplex driver with I2C-bus interface PCF8577C 6.5 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 Fig.4. 6.6 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. Duplex mode output waveforms are shown in Fig.5. Fig.5 Duplex mode display output waveforms. Von(rms) = 0.791 (VDD − VSS); Voff(rms) = 0.354 (VDD − VSS). V on rms () V off rms () ----------------------- 2.236 = MGA738 VDD VSS SS DD 0.5 (V V ) SS DD 0.5 (V V ) VDD VSS SS DD 0.5 (V V ) VDD VSS SS DD V V 0 SS DD 0.5 (V V ) SS DD (V V ) SS DD 0.5 (V V ) SS DD V V 0 SS DD 0.5 (V V ) SS DD (V V ) BP2 Sx BP1 Sx Segment x (Sx) BP1 BP2 1 f LCD OFF / OFF ON / OFF OFF / ON ON / ON |
Similar Part No. - PCF8577CP |
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Similar Description - PCF8577CP |
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