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 pro-
vide 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.)
E P N
T 1
T 2
S E G 1
S E G 3 0
T I M E R
S 1
H K
T i m e
B a s e
T i m e r
S h i f t
R e g i s t e r
S t a t e
C o n t r o l
C o n t r o l
C i r c u i t
C o m m o n
C i r c u i t
D e c o d e r
&
M U X
V o l t a g e
D o u b l e r
S e g m e n t
L a t c h
&
S e l e c t
S c a n
C K T
X 1
X 2
S 2
I N T
C O M 1
C O M 2
C O M 3
V A
V B
V C
R T
1 2 / 2 4
V D D
V S S
D I
S K
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
38
14
39
15
40
16
41
17
42
18
43
19
44
20
45
21
46
22
47
23
48
24
49
25
50
(0,0)
DI
S1
VSS
VA
VB
VC
VD
D
COM
1
COM
3
SEG
1
SEG2
SK
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG
1
5
SEG
1
6
SEG
1
7
SEG
1
8
SEG
1
9
SEG
2
0
SEG
2
1
SEG
2
2
SEG
2
3
SEG
2
4
SEG
2
5
SEG
2
6
SEG
2
7
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 or 24-hour format option pad, connected to 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
Positive power supply
VSS
Negative power supply, ground
Approximate internal connection circuit
HT1611C
Rev. 1.10
3
August 17, 2001
N M O S O U T
C M O S I N
P u l l - l o w
C M O S I N
P u l l - h i g h
O S C I L L A T O R
C M O S O U T
X 1
X 2
1 2 p F
1 5 p F
1 0 M W
V
D D
V
D D
Absolute Maximum Ratings
Supply Voltage ...........................................-0.3V to 5V
Storage Temperature .......................... -50C to 125C
Input Voltage ................................. V
SS
-0.3 to V
DD
+0.3
Operating Temperature ......................... -20C to 75C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings 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=25C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
V
DD
Operating Voltage
1.2
1.5
1.7
V
V
IL
Input Low Voltage
1.2V~1.7V
V
SS
0.2V
DD
V
V
IH
Input High Voltage
1.2V~1.7V
0.8V
DD
V
DD
V
I
STB
Standby Current
1.5V
V
HK
=Floating (or V
DD
)
0.1
1
mA
I
DD
Operating Current
1.5V
No load
3
10
mA
I
OL
Output Sink Current of INT
1.5V
V
O
=0.3V
500
1000
mA
t
A
Data Setup Time
1.5V
1
ms
t
B
Data Hold On Time
1.5V
2
ms
t
C
Inter Digit Time
1.5V
5
ms
t
DB
Debounce Time
(HK, S1, S2, TIMER)
1.5V
31.25
ms
R
HI
Pull-high Resistance
(HK, DI, SK)
1.5V
V
IN
=0V
1
MW
R
LO
Pull-low Resistance
(TIMER, S1, S2, 12/24)
1.5V
V
TIMER
=1.5V
5
MW
f
OSC
System Frequency
1.5V
Crystal=32768Hz
32768
Hz
HT1611C
Rev. 1.10
4
August 17, 2001
Functional Description
Operational flow chart
HT1611C
Rev. 1.10
5
August 17, 2001
HK=0 ?
"HK= 1"
> 5 secs ?
HK= "0" ?
N
N
N
Y
Y
N
N
Y
Y
N
Y
Y
Reset to 00
00
start real time clock
Display real time
Trig.
TIMER key?
N
Display dialing number
Timer stops, displays
total conversation time
Over 5 secs ?
N
Y
Y
N
Y
N
Y
Y
Reset to 00
00
& start timer
Keep counting
Timer hold
> 5 secs ?
N
Y
N
Power-on
Timer keeps counting,
displays timer value
Reset to 00
00
& start timer
Dialing data input ?
Trig. TIMER key ?
HK= "0" ?
HK= "0" ?
N
Y
HK= "0" ?
No
data in > 10 s ?
Trig. TIMER key ?
Trig. TIMER key ?
Trig. TIMER key ?
N
N
Y
Y
Reset to 00
00
& start timer
Keep counting
Timer hold
Trig. TIMER key ?
Trig. TIMER key ?
HK= "0" ?
N
N
Y
Y
N
Y
N
Y
HK=1
> 5 sec?
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