HT2040A datasheet(4/9 Pages) HOLTEK

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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.

HT2040A

26th Mar ’97

HT2040A Datasheet(PDF) 4 Page - Holtek Semiconductor Inc

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