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Q68100A1474R Datasheet(PDF) 8 Page - OSRAM GmbH |
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Q68100A1474R Datasheet(HTML) 8 Page - OSRAM GmbH |
8 / 16 page 2010-04-13 8 SCDQ5541P/Q/R, SCDQ5542P/Q/R, SCDQ5543P/Q/R, SCDQ5544P/Q/R SCDQ Block Diagram The following explains how to format the serial data to be loaded into the display. The user supplies a string of bit mapped decoded char- acters. The contents of this string is shown in Figure „Loading Serial Character Data A“ (page 8). Figure „Loading Serial Character Data B“ (page 8) shows that each character consists of six 8 bit words. The first word encodes the display character location and the suc- ceeding five bytes are row data. The row data represents the status (On, Off) of individual column LEDs. Figure „Loading Serial Character Data C“ (page 8) shows that each 8 bit word is formatted to include a three bit Operational Code (OPCODE) defined by bits D7–D5 and five bits (D4–D0) representing Column Data, Character Address, or Control Word Data. Figure „Loading Serial Character Data D“ (page 8) shows the sequence for loading the bytes of data. Bringing the LOAD line low enables the serial register to accept data. The shift action occurs on the low to high transition of the serial data clock (SDCLK). The least significant bit (D0) is loaded first. After eight clock pulses the LOAD line is brought high. With this transition the OPCODE is decoded. The decoded OPCODE directs D4–D0 to be latched in the Character Address register, stored in the RAM as Column data, or latched in the Control Word register. The control IC requires a minimum 600 ns delay between successive byte loads. Loading Serial Character Data IDBD5061 & 3 5 3 Display Multiplexer 20 x 5 bit Dual Port Ram Power Down Brightness Lamp Test Column Logic & Driver 20 & Driver Row Decoder 5 4 - 5 x 5 Characters Oscillator & Timing Counter Chain LOAD SDATA SDCLK 20 IDTC5043 D0 0 Character 0 D1 0 D2 0 D3 0 D4 Address Opcode D5 D7 1 0 D6 1 TBL 600 ns min. Column Data C4 D0 C3 D1 C2 D2 D4 C0 C1 D3 Opcode D5 0 D6 0 0 D7 min. 600 ns TBL D Character Address 0 Row 0 Column Data Row 1 Column Data Row 2 Column Data Row 3 Column Data Row 4 Column Data C B C A Character 0 Character 1 Character 2 Character 3 B LOAD SDCLK DATA D0 D1 D2 D3 D4 D5 D6 D7 TBL DD D |
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