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SCD55104A Datasheet(PDF) 8 Page - OSRAM GmbH |
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SCD55104A Datasheet(HTML) 8 Page - OSRAM GmbH |
8 / 17 page SCD55100A, SCD55101A, SCD55102A, SCD55103A, SCD55104A 2006-02-20 8 The following explains how to format the serial data to be loaded into the display. The user supplies a string of bit mapped decoded characters. The contents of this string is shown in Figure „Loading Serial Character Data a“ (page 8). Figure „Loading Serial Charac- ter Data b“ (page 8) shows that each character consist of six 8 bit words. The first word encodes the display character location and the succeeding 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. As indicated in Figure „Loading Serial Character Data a“ (page 8), a total of 660 clock cycles (60-8 bit words) are required to load all ten characters into the display. The Character Address Register bits, D4–D0 (Table „Load Charac- ter Address“ (page 9)) and Row Address Register bits, D7–D5 (Table „Load Column Data“ (page 9)) direct the Column Data bits, D4–D0 (Table „Load Column Data“ (page 9)) to specific RAM loca- tion. Table „Character ’D’“ (page 8) shows the Row Address for the example character “D.” Column data is written and read asynchro- nously from the 250 bit RAM. Once loaded the internal oscillator and character multiplexer reads the data from the RAM. These characters are row strobed with column data as shown in Figures „Row and Column Location“ (page 9) and „Row Strobing“ (page 10). The character strobe rate is determined by the internal or user supplied external MUX Clock and the IC’s ÷ 320 counter. Loading Serial Character Data Character “D” Op code D7 D6 D5 Column Data D4 D3 D2 D1 D0 C0 C1 C2 C3 C4 Hex Row 0 00 0 11 1 1 0 1E Row 1 00 1 10 0 0 1 31 Row 2 01 0 10 0 0 1 51 Row 3 01 1 10 0 0 1 71 Row 4 10 0 11 1 1 0 9E Character 0 Character 1 Character 2 Character 3 Character 4 Character 5 Character 6 Character 7 Character 8 Character 9 660 Clock Cycles, 132 µs Example: Serial Clock = 5 MHz, Clock Period = 200 ns Time between LOADS LOAD Serial Clock DATA Clock Period t 0 D0 D1 D2 D3 D4 D5 D6 D7 11 Clock Cycles, 2.2 s Time Between Loads OPCODE Character Address OPCODE Column Data D0 C4 D1 C3 D2 C2 D3 C1 D4 C0 Character 0 Address Row 0 Column Data 66 Clock Cycles, 13.2 µs Row 1 Column Data Row 2 Column Data Row 3 Column Data Row 4 Column Data D0 0 D1 0 D2 0 D3 0 D4 0 D5 1 D6 0 D7 0 D5 D6 D7 a. b. c. d. 11 Clock Cycles, 2.2 s 600 ns(min.) Time Between Loads 600 ns(min.) |
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