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Q68100A1474Q Datasheet(PDF) 10 Page - OSRAM GmbH |
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Q68100A1474Q Datasheet(HTML) 10 Page - OSRAM GmbH |
10 / 16 page SCDQ5541P/Q/R, SCDQ5542P/Q/R, SCDQ5543P/Q/R, SCDQ5544P/Q/R 2010-04-13 10 Row Strobe Example The user can activate four Control functions. These include: LED Brightness Level, Lamp Test, IC Power Down, or Display Clear. OPCODEs and five bit words are used to initiate these functions. The OPCODEs and Control Words for the Character Address and Loading Column Data are shown in Instruction Set Table. The user can select seven specific LED brightness levels. These brightness levels (in percentages of full brightness of the display) include: 100% (F0HEX), 53% (F1HEX), 40% (F2HEX), 27% (F3HEX), 20% (F4HEX), 13% (F5HEX), and 6.6% (F6HEX). The brightness levels are controlled by changing the duty factor of the row strobe pulse. The SCDQ554X offers a unique Display Power Down feature which reduces I CC to less than 50 µA. When FFHEX is loaded the display is set to 0% brightness and the internal multiplex clock is stopped. When in the Power Down mode data may still be written into the RAM. The display is reactivated by loading a new right- ness Level Control Word into the display. The Lamp Test is enabled by loading F8HEX into the serial shift register. This Control Word sets all of the LEDs to a 53% bright- ness level. Operation of the Lamp Test has no affect on the RAM and is cleared by loading a Brightness Control Word. The Software Clear (C0HEX) clears the Address Register and the RAM. The display is blanked and the Character Address Register will be set to Character 0. The internal counter and the Control Word Register are unaffected. The Software Clear will remain active until the next data input cycle is initiated. Electrical & Mechanical Considerations Interconnect Considerations Optimum product performance can be had when the following electrical and mechanical recommendations are adopted. The SCDQ554XX’s IC is constructed in a high speed CMOS process, consequently high speed noise on the SERIAL DATA, SERIAL DATA CLOCK, and LOAD lines may cause incorrect data to be written into the serial shift register. Adhere to transmission line ter- mination procedures when using fast line drivers and long cables (>10 cm). Good digital grounds (pin 1) and power supply decoupling (pin 2) will insure that I CC (<350 mA peak) switching currents do not gen- erate localized ground bounce. Therefore it is recommended that each display package use a 0.1 µF and 20 µF capacitor between V CC and ground. IDXX5182 Row 0 Row 1 Row 2 Row 3 Row 4 01 2 3 4 Columns Load Row 0 Load 4 Row 4 Columns 1 0 2 3 Row 3 Row 1 Row 0 Row 2 Load Row 1 Columns Row 4 1 0 2 4 3 Load Row 2 Row 2 Row 1 Row 3 Row 0 Row 4 0 Columns 2 13 4 Load Row 3 Row 0 Row 3 Row 1 Row 2 Row 4 Columns 01 2 4 3 Row 2 Row 1 Row 3 Row 0 Load Row 4 Row Display Brightness Op code D7 D6 D5 Control Word D4 D3 D2 D1 D0 Hex Operation Level 11 1 10 0 0 0 F0 100% 11 1 10 0 0 1 F1 53% 11 1 10 0 1 0 F2 40% 11 1 10 0 1 1 F3 27% 11 1 10 1 0 0 F4 20% 11 1 10 1 0 1 F5 13% 11 1 10 1 1 0 F6 6.6% Power Down Op code D7 D6 D5 Control Word D4 D3 D2 D1 D0 Hex Operation Level 11 1 11 1 1 1 FF 0% brightness Lamp Test Op code D7 D6 D5 Control Word D4 D3 D2 D1 D0 Hex Operation Level 11 1 10 B B B Lamp Test (OFF) 11 1 11 0 0 0 F8 Lamp Test (ON) Software Clear Op code D7 D6 D5 Control Word D4 D3 D2 D1 D0 Hex Operation Level 11 0 00 0 0 0 C0 CLEAR |
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