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HT2040A
Christmas Light Controller
Features
·
Operating voltage: 4.5V~5.5V
·
Up to 23 patterns can be programmed inside
·
4 SCR direct drive outputs
·
Built-in PLL circuit
·
10 different groups of lighting patterns
·
50Hz or 60Hz AC power supply applications
·
Up to 8 patterns for each group
·
Default 12 patterns for standard applica-
tions
·
Demonstration function
·
One key activation function
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
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HT2040A
Pad Coordinates
Unit: mil
Pad No. X
Y Pad No. X
Y
1
–46.47 –0.17
9
46.47 –23.89
2
–46.47 –7.01
10
46.47 –16.24
3
–46.47 –14.66
11
46.47 –4.51
4
–46.47 –32.22
12
46.47 42.59
5
–46.47 –42.59
13
35.17 42.59
6
–34.74 –42.59
14
23.86 42.59
7
38.82 –42.59
15
11.62 42.59
8
46.47 –42.59
16
–0.32 42.59
99 (mil)
2
* The IC substrate should be connected to VDD in the PCB layout artwork.
´
Pad Description
Pad No. Pad Name I/O
Internal
Connection
Description
1
L4
O
CMOS
Lamp driving signal
L4 generates a high SCR trigger signal to control the
lamp intensity.
2
VDD
I
—
Power supply (positive)
3
DK1
I
CMOS
Pull-Low
Demo function or group-5 selection input
If MODE is connected to VSS or open, DK1 will enable
the demo mode, i.e., show all the configurations (group-
1 ~ group-10) by being momentarily connected to VDD.
If MODE is connected to VDD, group-5 will be shown by
connecting DK1 to VDD.
4
SK2
I
CMOS
Pull-Low
One key activated display or group-6 selection
If MODE is connected to VSS or floating, SK2 will
display the next group by being momentarily pressed.
If MODE is connected to VDD, group-6 will be shown by
connecting SK2 to VDD.
5~8
K3~K6
I
CMOS
Pull-Low
Group1 ~ Group4 selection
If MODE is connected to VSS or floating, group-7~
group-10 will be shown by connecting MODE to VDD.
9
SYNC
I
CMOS
PLL synchronous signal input
The PLL circuit is synchronized to the AC power
supply. The system can operate with a 60Hz or 50Hz
AC power supply system.
10
C
I
NMOS
For low pass PLL filters
2
26th Mar ’97
Chip size: 107
HT2040A
Pad No. Pad Name I/O
Internal
Connection
Description
11
VSS
I
—
Power supply (ground)
12
MODE
I
CMOS
Pull-Low
MODE defines the operating functions of DK1, SK2,
and K3~K6 (refer to the functional description).
13
TEST
I
CMOS
Pull-High
For IC test only
14~16
L1~L3
O
CMOS
Lamp driving signals
L1~L3 generate high SCR trigger signals to control the
lamp intensity.
Approximate internal connection circuit
Absolute Maximum Ratings
Supply Voltage .............................. –0.3V to 5.5V
Storage Temperature................. –50
°
C to 125
°
C
Input Voltage..................V
SS
–0.3V to V
DD
+0.3V
Operating Temperature............... –20
°
C to 75
°
C
Electrical Characteristics
(Ta=25
°
C)
Test Condition
Symbol
Parameter
Min. Typ. Max. Unit
V
DD
Condition
V
DD
Supply Voltage
—
—
4.5
5.0
5.5
V
I
DD
Operating Current
5V
No load
—
300
600
m
A
I
OL
L1~L4 Output Sink Current
5V
V
OL
=0.5V
2.0
4.0
—
mA
I
OH
L1~L4 Output Source Current
5V
V
OH
=4.5V
–15
–22
—
m
A
V
IH
“H” Input Voltage
—
—
0.8V
DD
——V
IL
“L” Input Voltage
—
—
—
— 0.2V
DD
V
F
OSC
Internal System Frequency
—
AC 60Hz
—
122.9
—
KHz
AC 50Hz
—
102.4
—
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26th Mar ’97
HT2040A
Functional Description
The HT2040A provides 10 different lighting
configurations. Each lighting configuration is
called a group. A group is divided into sections
(up to 8 sections maximum) where each section
contains exactly one pattern. The patterns and
the corresponding sections can be programmed
into a group from a repository of up to 23 differ-
ent patterns. The default option for the chip is
12 patterns with 10 pre-programmed groups.
The groups can be individually selected by us-
ing the DK1, SK2, and K3~K6 pins, where each
pin has 2 functions that are decided by the
status of the MODE pin. All groups will be
displayed by momentarily connecting SK2 to
VDD with the MODE pin being connected to
VSS. Given this, the HT2040A provides a very
versatile and easy way of controlling lamps.
If the MODE pin is not connected to VDD and
power is turned on, the system will enable the
DEMO mode. But if the MODE pin is connected
to VDD, the system will show the group assign-
ment of each pin as shown in the following
table.
Selected Pin
MODE
Open or VSS VDD
DK1
active high
—
Show
Group-5
momentarily Demo function
—
SK2
active high
—
Show
Group-6
momentarily One key show
—
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
Group List
The available 10 groups in which the lamps can
be displayed are illustrated in the following
diagram. Each group is comprised by sections
where each section contains only one pattern.
The approximate time of each section is based
upon the 60Hz AC power frequency.
4
26th Mar ’97
HT2040A
5
26th Mar ’97
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