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HDSP-2533 Datasheet(PDF) 11 Page - Agilent(Hewlett-Packard) |
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HDSP-2533 Datasheet(HTML) 11 Page - Agilent(Hewlett-Packard) |
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11 / 16 page  11 Table 2. Current Requirements at Different Brightness Levels for All Colors Except AlGaAs %VDD = 5.0 V Symbol D2 D1 D0 Brightness 25 °C Typ. Units IDD (V) 0 0 0 100 200 mA 001 80 160 mA 010 53 106 mA 0 1 1 40 80 mA 1 0 0 27 54 mA 1 0 1 20 40 mA 1 1 0 13 26 mA Figure 5. Logic Levels to Access the Flash RAM. Control Word Register Figure 6 shows how to access the Control Word Register. This is an eight bit register which performs five functions. They are Brightness control, Flash RAM control, Blinking, Self Test and Clear. Each function is independent of the others. How- ever, all bits are updated during each Control Word write cycle. Brightness (Bits 0-2) Bits 0-2 of the Control Word adjust the brightness of the display. Bits 0-2 are interpreted as a three bit binary code with code (000) corresponding to maximum brightness and code (111) corresponding to a blanked display. In addition to varying the display brightness, bits 0-2 also vary the average value of IDD. IDD can be calculated at any brightness level by multiplying the percent brightness level by the value of IDD at the 100% brightness level. These values of IDD are shown in Table 2. Flash Function (Bit 3) Bit 3 determines whether the flashing character attribute is on or off. When bit 3 is a “1,” the output of the Flash RAM is checked. If the content of a loca- tion in the Flash RAM is a “1,” the associated digit will flash at approximately 2 Hz. For an external clock, the blink rate can be calculated by dividing the clock frequency by 28,672. If the flash enable bit of the Control Word is a “0,” the content of the Flash RAM is ignored. To use this function with multiple display systems see the Reset section. Blink Function (Bit 4) Bit 4 of the Control Word is used to synchronize blinking of all eight digits of the display. When this bit is a “1” all eight digits of the display will blink at approxi- mately 2 Hz. The actual rate is dependent on the clock frequency. For an external clock, the blink rate can be calculated by dividing the clock frequency by 28,672. This function will override the Flash function when it is active. To use this function with multiple display systems see the Reset section. Figure 6. Logic Levels to Access the Control Word Register |
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