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HCMS-2911 Datasheet(PDF) 9 Page - AVAGO TECHNOLOGIES LIMITED |
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HCMS-2911 Datasheet(HTML) 9 Page - AVAGO TECHNOLOGIES LIMITED |
9 / 16 page 9 HCMS-29xx Write Cycle Diagram NOTE: 1. DATA IS COPIED TO THE CONTROL REGISTER OR THE DOT LATCH AND LED OUTPUTS WHEN CE IS HIGH AND CLK IS LOW. TRSS RSH T TCLKCE CES T CLKH T CLKL T CEH T DS T DH T CEDO T DOUT T DOUTP T PREVIOUS DATA NEW DATA NEW DATA LATCHED HERE [1] CE RS CLK D IN LED OUTPUTS, CONTROL REGISTERS (SIMULTANEOUS) OUT D D (SERIAL) OUT 2 1 3 4 11 12 6 7 8 10 9 5 Control Word 0 Loading the Control Register with D7 = Logic low se- lects Control Word 0 (see Table 2). Bits D0-D3 adjust the display brightness by pulse width modulating the LED on-time, while Bits D4-D5 adjust the display brightness by changing the peak pixel current. Bit D6 selects normal operation or sleep mode. Sleep mode (Control Word 0, bit D6 = Low) turns off the Internal Display Oscillator and the LED pixel drivers. This mode is used when the IC needs to be powered up, but does not need to be active. Current draw in sleep mode is nearly zero. Data in the Dot Register and Control Words are retained during sleep mode. Control Register The Control Register allows software modification of the IC’s operation and consists of two independent 7-bit control words. Bit D7 in the shift register selects one of the two 7-bit control words. Control Word 0 performs pulse width modulation brightness control, peak pixel current brightness control, and sleep mode. Control Word 1 sets serial/simultaneous data out mode, and external oscillator prescaler. Each function is independent of the others. Control Register Data Loading Data is loaded into the Control Register, MSB first, ac- cording to the procedure shown in Table 1 and the Write Cycle Timing Diagram. First, RS is brought to logic high and then CE is brought to logic low. Next, each successive rising CLK edge will shift in the data on the DIN pin. Finally, when 8 bits have been loaded, the CE line is brought to logic high. When CLK goes to logic low, new data is copied into the selected control word. Loading data into the Control Register takes place while the previous control word configures the display. |
Similar Part No. - HCMS-2911 |
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Similar Description - HCMS-2911 |
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