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SLY2016 Datasheet(PDF) 5 Page - OSRAM GmbH |
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SLY2016 Datasheet(HTML) 5 Page - OSRAM GmbH |
5 / 10 page SLR2016, SLO2016, SLG2016, SLY2016, SCD5584A 2006-01-23 5 Display Blanking Blank the display by loading a blank or space into each digit of the display or by using the (BL) display blank input. Setting the (BL) input low does not affect the contents of data memory. A flashing circuit can easily be constructed using a 555 as table multivibrator. Figure 3 illustrates a circuit in which varying R1 (100K~10K) will have a flash rate of 1.0 Hz~10 Hz. The display can be dimmed by pulse width modulating the (BL) at a frequency sufficiently fast to not interfere with the internal clock. The dimming signal frequency should be 2.5 kHz or higher. Dim- ming the display also reduces power consumption. An example of a simple dimming circuit using a 556 is illustrated in Figure 4. Adjusting potentiometer R3 will dim the display by chang- ing the blanking pulse duty cycle. Flashing Circuit Using a 555 and Flashing (Blanking) Timing Dimming Circuit Using a 556 and Dimming (Blanking) Timing Typical Loading State Table WR A1 A0 D6 D5 D4 D3 D2 D1 D0 Digit 3 2 1 0 H previously loaded display G R E Y L L L H L L L H L H G R E E L L H H L H L H L H G R U E L H L H L L H H L L G L U E L H H H L L L L H L B L U E L L H H L L L H L H B L E E L L L H L H L H H H B L E W L X X see character code see char. set IDCD5033 Timer 555 1 2 3 4 7 8 6 5 1 R 4.7 k Ω 100 k R2 Ω 10 µF C3 0.01 µF C4 CC V = 5 V To BL Pin on Display IDCD5035 1 0 500 ms Blanking Pulse Width 50% Duty Factor 2 Hz Blanking Frequency ~ ~ ~ ~ ~ ~ IDCD5034 Dual Timer 556 1 2 3 4 13 14 12 11 500 k R3 Ω 1000 pF C3 CC V = 5 V 6 7 5 9 8 10 C 0.01 µF 4 0.01 µF C2 2 47 k R Ω 200 R1 Ω 4700 pF C1 Control Dimming (Blanking) To BL Pin on Display IDCD5036 1 0 200 µs Blanking Pulse Width 4 µs min., 196 µs max. 5 kHz Blanking Frequency ~ ~ ~ ~ |
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