E-LS1357-V1.2 Datasheet, PDF (2/6 Pages) BOWIN ELECTRONIC CO. – 4 Digit Time With Colon Default

LSI
LS 1357
Operation Flow
(a) After the power on, it return to display shows “Default timer value”, “colon”
and “TM” always on (not flash).
(b) Countdown Timer: This timer fixed timing count down. The step is one
minute or one day (selectable by bonding option) . Press “Start/Stop” key to
start counting. The “TM” always on. The “colon” 0.5 second on and 0.5
second off at counting, no flash at stop The alarm sound generates when the
timer reached zero, press “Start/Stop” key to stop counting even the timer in
counting or reached zero, press the key again then return to continues
counting.
(c) Press “Start/Stop” and hold it for 2 second, the timer will reload “Default
timer value” and stand-by for start counting.
(d) Keys: Only “ST/SP” key for start, stop and repeat.
Pin Assignment
DESIGNATION
B0, B1
V1, V2
VEE
T1, T2
OO
OI
VDD
GND
I0, I1, I2, I3, I4 and I5
C[1:3]
S[1:10]
PB
O0, O1, O2 and O3
TYPE
OUTPUT
OUTPUT
OUTPUT
INPUT
OUTPUT
INPUT
POWER
POWER
INPUT(PL)
OUTPUT
OUTPUT
INPUT(PH)
OUTPUT
Note: (PH) - pull high , (PL) – pull low.
DESCRIPTION
Buzzer output
Doubler output
-1.5V
TEST pin
32KHz oscillator output
32KHz oscillator input
+1.5V power supply
Ground
Input key
LCD Common output
LCD Segment output
RESET
Output Pin
Absolute Maximum Ratings
Supply voltage Vdd - Vss..........................0 to 5V
Input voltage Vin.................................Vss to Vdd
Operating temperature Top .............-10°C to 60°C
Storing temperature Tst ...................-40°C to 70°C
Comments
Stress above those listed under Absolute Maximum Ratings may
cause permanent damage to the device. These are stress rating
only. Functional operation of this device at these or any other
conditions above those indicated in the operational sections of
this specification is not implied and exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
D.C. Electrical Characteristics
2
Version 1.2(24, 10, 2003)