HT1611C
Timer with Dialer Interface
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
Patent Number: 84545 (R.O.C.)
Patent Pending: 08/214, 079 (U.S.A.)
·
Real time clock with stopwatch
·
Built-in dialer interface
·
12-hour or 24-hour format
·
Two-button sequential operation for real time clock
setting
(8-digit hand-held calculator LCD used for 8-digit ap-
plications)
·
Uses 32768Hz crystal
Applications
·
Timers, clocks, watches
·
LCD display drivers
·
Telephone display interface
·
Instrument display
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 pro-
vide a stopwatch function and timer reset/hold functions
(for details, refer to the functional description).
Block Diagram
X 1
X 2
T 1
T 2
T im e r
D I
S K
S 2
S h ift
R e g is te r
S ta te
C o n tro l
S e g m e n t
L a tc h
&
S e le c t
C o n tro l
C ir c u it
S c a n
C K T
S E G 3 0
D e c o d e r
&
M U X
S E G 1
V o lta g e
D o u b le r
T im e
B a s e
C o m m o n
C ir c u it
IN T
C O M 1
C O M 2
C O M 3
V A
V B
V C
T IM E R
1 2 /2 4
S 1
H K
R T
E P N
V D D
V S S
Rev. 1.10
1
August 17, 2001
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
