HT1611C Datasheet, PDF (1/13 Pages) Holtek Semiconductor Inc – Timer with Dialer Interface

HT1611C
Timer with Dialer Interface
Features
Patent Number: 84545 (R.O.C.)
Patent Pending: 08/214, 079 (U.S.A.)
· 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
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
X1
X2
T im e
T1
B ase
T2
T im e r
DI
S h ift
SK
R e g is te r
S2
S ta te
C o n tro l
T IM E R
1 2 /2 4
S1
HK
C o n tro l
C ir c u it
C om m on
C ir c u it
D ecoder
&
M UX
S can
CKT
V o lta g e
D o u b le r
IN T
COM 1
COM 2
COM 3
VA
VB
VC
S egm ent
L a tc h
&
S e le c t
SEG 1
S E G 30
RT
EPN
VDD VSS
Rev. 1.10
1
August 17, 2001