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| A low-cost, low power CMOS LSI device for controlling Christmas lights, or similar low wattage mains lamps. The IC has four outputs that directly drive the SCRs controlling the lamps. The lamps can be displayed in 10 different groups which are selected by input switches. Within each group, each lamp has an individual display pattern of which there are 12. Each group can be selected by using the DK1, SK2 and K3 to K6 pins, with each pin having two functions depending on the condition of the MODE pin. In addition, all groups can be displayed automatically by momentarily connecting DK1 to VDD with MODE connected to VSS. The groups can be selected sequentially by momentarily connecting pin SK2 to VDD with MODE connected to VSS he device is designed to operated from a 5V DC supply, and has a built-in PLL circuit that can be synchronised to either 50Hz or 60Hz mains. |
| Select Pin |
MODE open |
Mode connected |
| DK1 active |
---- |
Show group 5 |
| DK1 momentarily |
Demo Function |
---- |
| closed to VDD |
MODE to VSS |
| SK2 active high |
---- |
Show group 6 |
| SK2 momentarily |
Sequential group |
| K3 active high |
Show group 1 |
Show group 7 |
| K4 active high |
Show group 2 |
Show group 8 |
| K5 active high |
Show group 3 |
Show group 9 |
| K6 active high |
Show group 4 |
Show group 10 |
| With the suggested components lamp rating for each SCR is 250W |
| R1 |
Carbon Film 100k 1W |
(C100K) |
| C1 |
Gen Elect 47╡F 16V |
(AU01B) |
| C2 |
Met Polyester 0.1╡F |
(CX00A) |
| ZD1 |
5.1V 500mW Zener |
(QH07H) |
| SW1-6,9 |
Square Locking |
(YW41U) |
| SW7,8 |
Push Button Switches |
(FF96E) |
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