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HT2021

Two Lamp/LED Flash Driver

Features

·

CMOS Metal-Gate Process

·

In-Phase or Out-of-Phase selection

·

Operating voltage: 1.2V~4.5V

·

Synchronous flash with a melody interface

·

Low stand-by current: 1

mA at 3V

·

1/8 duty cycle output

·

Two lamp flash driver with a 10mA driving

capability

·

A built-in oscillator

·

Minimum external components

General Description

The HT2021 is a low cost, low-power CMOS LSI

chip designed for lamp and LED flash drivers.

It contains two 10mA flash drivers that can be

driven in-phase or out-of-phase. The chip re-

quires only one external resistor for normal

applications. It is suitable for use in products

that require flashing lights, such as Christmas

decoration, gift cards, and so on.

Pin Assignment

Block Diagram

1

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HT2021

Pad Coordinates

Unit: mil

Pad

No.

X

Y

Pad

No.

X

Y

1 –23.65 19.65 8 23.65 –26.25

2 –23.65 11.55 9 23.65 –14.35

3 –23.65 3.35 10 23.65 –4.4

4 –23.65 –4.75 11 23.65 3.65

5 –23.65 –12.85 12 23.65 11.9

6 –11.15 –26.25 13 23.65

20

7

1.35 –26.2

65 (mil) 2

*The IC substrate should be connected to VDD in the PCB layout artwork.

´

Pad Description

Pad No.

Pad Name

I/O

Description

1

OUT2

O Lamp/LED flash drive output

2

VDD

I Positive power supply

3

OPT1

I Melody Interface selection

4

TEST2

I/O For IC test only

5

OSC2

O Oscillator output

6

OSC1

I Oscillator input

7

TEST3

O For IC test only

8

TEST1

I/O For IC test only

9

ONE-SHOT

I One shot control input

10

MELODY IN

I Melody input from the melody IC

11

OPT2

I In-Phase or Out-of-Phase selection

12

VSS

I Negative power supply, GND

13

OUT1

O Lamp/LED drive output

Note: (a) OPTION 1 = 0

®

No melody interface

OPTION 1 = 1

®

Melody interface

(b) OPTION 2 = 0

®

Out-of-phase

OPTION 2 = Open

®

In-phase

2

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Chip size: 60

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HT2021

Absolute Maximum Ratings

Supply Voltage ................................. –0.3V to 5V

Storage Temperature................. –50

°C to 125°C

Input/Output Voltage ....V SS –0.3V to V DD +0.3V

Operating Temperature................... 0

°C to 70°C

Electrical Characteristics

(Ta=25

°C)

Test Condition

Symbol

Parameter

Min. Typ. Max. Unit

V DD

Condition

V DD

Operating Voltage

—

—

1.2

3

4.5

V

I STB

Stand-by Current

3V

No load

—

1

2

mA

I DD

Operating Current

3V

—

—

200

500

m

A

1.5V

V OL =0.5V

5

8

—

mA

I OL

Output Sink Current

3V

V OL =0.5V

10

15

—

mA

F OSC

Oscillator Frequency

3V

—

128k

—

Hz

Timing Diagram

In-phase output: (when fosc=128kHz)

Out-of-phase output: (when fosc=28kHz)

3

27th Mar ’97

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HT2021

Melody interface timing: (out-of-phase)

Application Circuit

One-shot mode

4

27th Mar ’97

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HT2021

Power-on mode

5

27th Mar ’97

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