MIK1089C
6 Functions 6 Digit Alarm-
Chronograph Duplexed LCD
Watch Circuit
Revised October 1999
Features
Single chip CMOS construction
Drives 6 digit duplexes LCD with 7 day mark, AM/PM
mark, date mark and alarm mark
Colon display
Direct drive of piezoelectric transducer at 3 volt peak to
peak
32,768 Hz Crystal frequency
On-chip oscillator and resistors
On-chip voltage doubler
Single 1.5 V battery operation
Low power dissipation
Debounce circuitry on switch inputs
Protection against static discharge
Functions
6 Function: Month, Date, Day-of-Week, Hour, Minute,
Second
Alarm function with 4 to 5 minute snooze
6 Digit chronograph: Autoranging after 30 minutes to hour,
minute, second
User seletable 12 hour/24 hour format
Alarm output for melody IC (KS5310, KS5381, KS5318
series)
4 Year calendar
One touch correction of time error within 30 seconds
Fast advance for time and alarm time set
Chime on every hour
Electrical Characteristics
(T
a
= 25
o
C, V
DD
= 0 V, V
SS
= -1.5 V; unless otherwise specified)
Parameter
Symbol Test
Condition Min Typ Max
Unit
V
SS
1.2 1.5 1.8 V
Operating Voltage
V
EE
2.4 3.0 3.6 V
Supply Current
I
DD
Without
Load -
2.0
A
Input High Voltage
V
IH
V
DD
-0.3
V
DD
V
Input Low Voltage
V
IL
V
SS
V
SS
+0.3
Oscillator Start Voltage
V
OSC
Within 5 sec
1.45
V
I
ala
V
sat
= 0.5 V
(Both Direction)
0.5 - mA
Alarm Driver Current
I
alb
V
sat
= 0.5 V
10
-
A
DC-DC Conversion Frequency
F
CON
C
1
= C
2
= 0.1
F
1,024 KHz
LCD Frequency
F
d
32
Hz
Time Stability
T
stb
V
SS
= -1.3
-1.8 V
- 3
ppm
Switch Debouncing Time
Tdeb
31.25
msec
Quartz Crystal Parameters: Fp=32768 Hz, C
L
=12.5 pF, C
O
=1.2pF, C
1
=3.0FF,R
r
=35K
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