Holtek Semiconductor Inc HT1611, HT1611C Datasheet

HT1611C

Timer with Dialer Interface

Block Diagram

Rev. 1.10 1 August 17, 2001

General Description

The HT1611C is a CMOS chip designed for dialer inter

­faces driving 8 or 10-digit LCDs. Various functions, such
as real time clock, dialing number and conversation time
display are provided.

The real time is displayed by default. When answering a
telephone call, the timer is activated to tell users how
long the conversation has taken. After the telephone is
hung up, the total conversation time is shown for about 5

seconds and then the real time is displayed again.
When making a phone call, the HT1611C receives the
dialing data from the dialer and displays the phone num

­ber from left to right on the LCD. However, if there is no
dialing action within 10 seconds, it restarts the timer
again. By adding a TIMER key, the HT1611C can pro­vide a stopwatch function and timer reset/hold functions
(for details, refer to the functional description).

Features

·

Operating voltage: 1.2V~1.7V

·

Low operating current: 3mA (typ.)

·

Dialing number and conversation time display

·

Conversation timer (59 mins and 59 secs max.)

·

8 or 10-digit LCD display driver; 3V,1/2 bias, 1/3 duty
(8-digit hand-held calculator LCD used for 8-digit ap

-

plications)

·

Real time clock with stopwatch

·

Built-in dialer interface

·

12-hour or 24-hour format

·

Two-button sequential operation for real time clock
setting

·

Uses 32768Hz crystal

Applications

·

Timers, clocks, watches

·

LCD display drivers

·

Telephone display interface

·

Instrument display

Patent Number: 84545 (R.O.C.)
Patent Pending: 08/214, 079 (U.S.A.)

EPN

T1

T2

SEG1

SEG30

TIM ER

S1

HK

Tim e
Base

Tim er

Shift

R egister

State

C ontrol

C ontrol

Circuit

Comm on

Circuit

D ecoder

&

MUX

Voltage
D oubler

Segm ent

Latch

&

Select

Scan
CKT

X1
X2

S2

IN T

COM 1

COM 2

COM 3

VA

VB

VC

RT

12/24

VDD VSS

DI

SK

Pad Assignment

Chip size: 122.5 ´ 124.9 (mil)

2

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

Pad Coordinates Unit: mil

Pad No. X Y Pad No. X Y Pad No. X Y

1

-55.73

37.50 18

-16.79 -54.72

35 55.46 35.51

2

-55.73

30.58 19 3.90

-54.72

36 55.46 42.86

3

-55.73

23.66 20 12.43

-54.72

37 55.46 50.20

4

-55.73

16.77 21 18.40

-54.72

38 37.60 55.02

5

-55.73

9.85 22 31.48

-54.72

39 30.26 55.02

6

-55.73

2.85 23 45.02

-54.72

40 22.91 55.02

7

-55.73 -4.07

24 55.50

-54.72

41 15.57 55.02

8

-55.73 -11.00

25 55.46

-37.96

42 8.22 55.02

9

-55.73 -17.96

26 55.46

-30.58

43 0.88 55.02

10

-55.73 -24.84

27 55.46

-23.24

44

-6.46

55.02

11

-55.73 -31.73

28 55.46

-15.89

45

-13.81

55.02

12

-55.73 -38.65

29 55.46

-8.55

46

-21.15

55.02

13

-55.73 -47.03

30 55.46

-1.21

47

-28.50

55.02

14

-52.02 -54.72

31 55.46 6.14 48

-35.84

55.02

15

-41.35 -54.72

32 55.46 13.48 49

-43.18

55.02

16

-32.86 -54.72

33 55.46 20.83 50

-50.53

55.02

17

-25.97 -54.72

34 55.46 28.17

HT1611C

Rev. 1.10 2 August 17, 2001

1

26

2

27

3

28

4

29

5

30

6

31

7

32

8

33

9

34

10

35

11

36

12

37

13

381439

15401641174218

43194420452146224723482449

25

50

(0,0)

DI

S1

VSS

VA

VB

VC

VDD

COM1

COM3

SEG1

SEG2

SK

SEG14

SEG13

SEG12

SEG11

SEG10

SEG9

SEG8

SEG7

SEG6

SEG5

SEG4

SEG3

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

SEG23

SEG24

SEG25

SEG26

SEG27

HK

INT

12/24

SEG28

SEG29

SEG30

COM2

S2

X2

X1

TIMER

T2

T1

Pad Description

Pad Name I/O

Internal

Connection

Description

SEG1~SEG30 O CMOS OUT LCD segment signal output pads

COM1~COM3 O CMOS OUT LCD common signal output pads

HK

I

CMOS IN

Pull-high

Hook switch detector input
Active low

S2 I

CMOS IN

Pull-low

Clock adjusting switch
Active high

X2 O OSCILLATOR 32768Hz crystal oscillator output

X1 I OSCILLATOR 32768Hz crystal oscillator input

T2

I

CMOS IN

Pull-high

Test pad (connected to VSS for production test)

T1

I

CMOS IN

Pull-high

Test pad (connected to VSS for production test)

INT O NMOS OUT Interrupt output, 2Hz (default) or 16Hz (by mask option)

TIMER I

CMOS IN

Pull-low

Timer reset and start/hold toggle control input pad

12/24

I

CMOS IN

Pull-low

12-hour or24-hour format option pad, connectedto VDD for 12-hour format

S1 I

CMOS IN

Pull-low

Clock setting switch
Active high

DI

I

CMOS IN

Pull-high

Serial data input pad (connected to the dialer)
Data should be valid at the falling edge of SK

SK I

CMOS IN

Pull-high

Clock input pad (connected to the dialer)

VA O CMOS OUT Voltage doubler, connected to the external capacitor

VB O CMOS OUT Voltage doubler, connected to the external capacitor

VC O CMOS OUT Voltage doubler, connected to the external capacitor

VDD

¾¾

Positive power supply

VSS

¾¾

Negative power supply, ground

Approximate internal connection circuit

HT1611C

Rev. 1.10 3 August 17, 2001

NMOS OUTCMOS IN

Pull-low

CMOS IN

Pull-high

OSCILLATORCMOS OUT

X1

X2

12pF

15pF

10M

W

V

DD

V

DD

Absolute Maximum Ratings

Supply Voltage ...........................................-0.3V to 5V

Storage Temperature .......................... -50°Cto125°C

Input Voltage ................................. V

SS

-0.3 to VDD+0.3

Operating Temperature ......................... -20°Cto75°C

Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may

cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil

-

ity.

Electrical Characteristics

f

OSC

=32768Hz, Ta=25°C

Symbol Parameter

Test Conditions

Min. Typ. Max. Unit

V

DD

Conditions

V

DD

Operating Voltage

¾¾

1.2 1.5 1.7 V

V

IL

Input Low Voltage 1.2V~1.7V

¾

V

SS

¾

0.2V

DD

V

V

IH

Input High Voltage 1.2V~1.7V

¾

0.8V

DD

¾

V

DD

V

I

STB

Standby Current 1.5V

V

HK

=Floating (or VDD)

¾

0.1 1

mA

I

DD

Operating Current 1.5V No load

¾

310

mA

I

OL

Output Sink Current of INT 1.5V

V

O

=0.3V

500 1000

¾mA

t

A

Data Setup Time 1.5V

¾

1

¾¾ms

t

B

Data Hold On Time 1.5V

¾

2

¾¾ms

t

C

Inter Digit Time 1.5V

¾

5

¾¾ms

t

DB

Debounce Time
(HK

, S1, S2, TIMER)

1.5V

¾¾

31.25

¾

ms

R

HI

Pull-high Resistance
(HK

,DI,SK)

1.5V

V

IN

=0V

¾

1

¾ MW

R

LO

Pull-low Resistance
(TIMER, S1, S2, 12/24

)

1.5V

V

TIMER

=1.5V

¾

5

¾ MW

f

OSC

System Frequency 1.5V Crystal=32768Hz

¾

32768

¾

Hz

HT1611C

Rev. 1.10 4 August 17, 2001