HT1350
Step Counter
Block Diagram
1
June 28, 1999
Features
Operating voltage: 1.5V
Auto walking or jogging detection
Step number/mileage/kilometer/calorie
display
LCD display
An oscillator with 32kHz
Few external components
Low power consumption
An LCD with 1/3 duty, 1/2 bias
General Description
The HT1350 is a step counter IC implemented
in the CMOS technology. It provides an LCD
with a whole course (kilometer/mile) as well as
the consumed calorie display.
The HT1350 consists of internal oscillator cir-
cuit, a step number/kilometer/mile/calorie step
counter, a voltage doubler, and an LCD display
multiplexer.
The IC can automatically distinguish walking
from jogging, thus making appropriate calcula-
tions.
O s c i l l a t o r
V D D
V S S
P r e s c a l e r
M u l t i p l e x e r C i r c u i t
C P 1 C P 2 C P 3
C O M 1 C O M 2 C O M 3
O U T 4
O U T 1 7
O S C 2
O S C 1
S t e p P u l s e
G e n e r a t o r
A u t o - D e t e c t
C i r c u i t
( J o g / W a l k )
S T E P
W A L K / R U N
A U T O / M A N U
M o d e
S w i t c h
M O D E
S t e p
C o u n t e r
M i l e
C o u n t e r
K m
C o u n t e r
C a l e s
C o u n t e r
L e v e l S h i f t
C i r c u i t
T E S T 1
T E S T 3
R E S E T
T E S T 2
Pad Assignment
Chip size: 2725 2780 (mm)
2
* The IC substrate should be connected to VDD in the PCB layout artwork.
Unit: mm
Pad No.
X
Y
Pad No.
X
Y
1
-1206.00
1159.50
17
762.00
-1190.50
2
-1206.00
994.50
18
962.00
-1190.50
3
-1206.00
661.70
19
1202.00
-1190.50
4
-1206.00
71.50
20
1202.00
-753.50
5
-1206.00
-159.50
21
1202.00
-335.50
6
-1206.00
-359.50
22
1202.00
-135.50
7
-1206.00
-624.50
23
1202.00
65.50
8
-1206.00
-824.50
24
1202.00
259.50
9
-1098.00
-1190.50
25
1202.00
537.00
10
-898.00
-1190.50
26
1078.00
1167.50
11
-633.00
-1190.50
27
812.00
1167.50
12
-433.00
-1190.50
28
631.00
1167.50
13
-168.00
-1190.50
29
447.00
1167.50
14
32.00
-1190.50
30
-59.00
1167.50
15
297.00
-1190.50
31
-259.00
1167.50
16
497.00
-1190.50
32
-966.00
1167.50
HT1350
2
June 28, 1999
AU
T
O
/
M
A
N
U
WA
L
K
/
R
U
N
1
1 7
2
1 8
3
1 9
4
2 0
5
2 1
6
2 2
7
2 3
8
2 4
9
2 5
1 0
2 6
1 1
2 7
1 2
2 8
1 3
2 9
1 4
3 0
1 5
3 1
1 6
3 2
( 0 , 0 )
T E S T 2
T E S T 1
O S C 2
RE
S
E
T
MO
D
E
VS
S
T
EST
3
VD
D
O S C 1
O U T 1 7
O U T 1 6
O U T 1 5
O U T 1 4
OU
T
1
3
OU
T
1
2
OU
T
1
1
OU
T
1
0
OU
T
9
OU
T
8
OU
T
7
OU
T
6
OU
T
5
OU
T
4
CO
M
3
C O M 2
C O M 1
C P 3
C P 2
C P 1
S T E P
Pad Description
Pad No
Pad Name
I/O
Internal
Connection
Descriptions
1
TEST2
I/O
For IC test only
2
TEST1
I/O
For IC test only
3
OSC2
O
Oscillator output
4
OSC1
I
Oscillator input
5~18
OUT17~OUT4 O
CMOS
Display data output pads for segments
19~21
COM3~COM1 O
NMOS
Display data output pads for commons
22
CP3
O
*
Bias supply voltage pad for driving the LCD panel
23~24
CP2~CP1
O
*
LCD bias supply voltage control pads
25
STEP
I
CMOS
Pull-high
Step sensor input pad
26
WALK/RUN
I
CMOS
Pull-high
Walk/Run mode manual set pad
27
AUTO/MANU
I
CMOS
Pull-high
Auto detection/Manual set selection pad
28
VDD
I
Positive power supply
29
TEST3
I/O
For IC test only
30
VSS
I
Negative power supply (GND)
31
MODE
O
CMOS
Pull-high
LCD display mode selection
32
RESET
O
CMOS
Pull-high
System reset pad
Approximate internal connection circuits
HT1350
3
June 28, 1999
N M O S O U T
( F o r C O M 1 ~ C O M 3 )
C M O S I N
P u l l - h i g h
C M O S O U T
O S C I L L A T O R
C P 1 ~ C P 3
V D D
V D D
O S C 1
O S C 2
V D D
C O M 1 ~
C O M 3
V S S
C P 1
C P 3
C P 2
Absolute Maximum Ratings
Supply Voltage.................................-0.3V to 5V
Storage Temperature.................-50C to 125C
Input Voltage.................V
SS
-0.3V to V
DD
+0.3V
Operating Temperature ..................0C to 70C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maxi-
mum Ratings may cause substantial damage to the device. Functional operation of this de-
vice at other conditions beyond those listed in the specification is not implied and prolonged
exposure to extreme conditions may affect device reliability.
Electrical Characteristics
Ta=25C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
V
DD
Operating Voltage
1.3
1.5
1.7
V
I
DD
Operating Current
1.5V No load,
f
OSC
=32kHz
1.5
3
mA
I
STB
Standby Current
1.5V
0.5
1
mA
V
IL
Input Low Voltage
1.5V
0.2V
DD
V
V
IH
Input High Voltage
1.5V
0.8V
DD
V
f
OSC
System Frequency
1.5V
32
kHz
HT1350
4
June 28, 1999
Functional Description
The HT1350 is a step counter IC. It is used to au-
tomatically count the step number taken by a
runner and to display the whole course (kilome-
ter/mile) combined with the calories consumed
on the LCD.
The IC is turned on and off with respect to the
on/off status of a short of spring switch which
corresponds to the up/down motion of the steps.
The output of step number can be changed to
kilometers/miles or calories by counting the to-
tal number of times the step switch is closed.
The IC can automatically distinguish between
walking and jogging and make the according
calculations. The output of the LCD is busy
when the RESET key is pressed. Once the LCD
is in the busy state, the step counter will start
counting at 0 after 0.5 seconds till the runner
stops running and stands still. After the step
counter stops counting, pressing the MODE
key will display the step numbermilekilo-
metercalorie in sequence.
LCD Display
Application Circuit
HT1350
5
June 28, 1999
C o m 1
1
2
3
4
5
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
C o m 2
C o m 3
D 5 e
D 5 f
D 5 a
D 5 d
D 5 g
D 5 b
D 4 e
D 4 f
D 4 a
D 4 d
D 4 g
D 4 b
D 3 e
D 3 f
D 3 a
D 3 d
D 3 g
D 3 b
D 3 c
D 2 e
D 2 f
D 2 a
D 2 d
D 2 g
D 2 b
D 1 e
D 1 f
D 1 a
D 1 d
D 1 g
D 1 b
D 2 c
D 1 c
D 4 c
C a l s
M i l e s
D 5 c
K m
a
b
c
d
e
f
g
D i g i t 5
D i g i t 4
D i g i t 3
D i g i t 2
D i g i t 1
P 1
P 2
P 1
P 2
C P 3
V D D
V S S
O S C 1
O S C 2
R E S E T
M O D E
C O M 1 C O M 2 C O M 3
C P 1
C P 2
S T E P
1 0 2
O U T 4
O U T 1 7
0 6 ! #
X 1 4
1 0 2
1 . 5 V
3 2 k H z
HT1350
6
June 28, 1999
Copyright 1999 by HOL TEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek
assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are
used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications
will be suitable without further modification, nor recommends the use of its products for application that may pres-
ent a risk to human life due to malfunction or otherwise. Holtek reserves the right to alter its products without prior
notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.
Holtek Semiconductor Inc. (Headquarters)
No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C.
Tel: 886-3-563-1999
Fax: 886-3-563-1189
Holtek Semiconductor Inc. (Taipei Office)
5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C.
Tel: 886-2-2782-9635
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RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong
Tel: 852-2-745-8288
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