HT2040A
Christmas Light Controller
Features
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Operating voltage: 4.5V~5.5V
4 SCR direct drive outputs
10 different groups of lighting patterns
Up to 8 patterns for each group
Demonstration function
One key activation function
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Up to 23 patterns can be programmed inside
Built-in PLL circuit
50Hz or 60Hz AC power supply applications
Default 12 patterns for standard applica-
tions
General Description
The HT2040A is a low cost, low power CMOS
LSI chip designed for use in Christmas lighting
control products. It provides 4 SCR outputs to
control the lamps. The lamps can display up to
10 different groups of lighting patterns, where
each pattern or pattern group is chosen by ap-
propriate input keys.
The available 10 groups of lighting patterns can
all be displayed automatically or sequentially
using a single key. (12 patterns and 10 pre-pro-
grammed groups are provided by default.)
The internal PLL circuit allows synchronized
control of the SCRs at either 50Hz or 60Hz AC
supply voltage.
Pin Assignment
Block Diagram
1
26th Mar ’97
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
