BT8014
1
DIGITAL THERMOMETER
DESCRIPTION
The BT8014 is a CMOS integrated circuit provided with digital thermometer
function.
Temperature reading from 50
o
C to +50
o
C (-57
o
F ~ +122
o
F) is detected by use of a
thermistor as a sensor and temperature is displayed on a 4 digit LCD by 0.2
o
C step. High
accuracy is obtained by providing non-linear correction circuit for thermistor inside the IC.
FEATURES
Measurement accuracy: 1
o
C
Resolution : 0.2
o
C (
o
F)
4 digits,
1
/
2
duty LCD
Low power consumption
Few external components
Easiness in adjustment
Single 1.5V battery operation
Bare chip is available
FUNCTIONS
Measurable temperature range 49
o
C ~
+49.8
o
C -57
o
F ~ +121.8
o
F
Suitable Thermistor RT=10k 1% (at
25
o
C)
Sampling Cycle selectable: 2 or 10
seconds
(Default 10 sec)
On chip oscillator
Temperature adjustment: Adjustment of
temperature is
made by adjusting fundamental resistance
against
dispersion in resistance values of
thermistors
ABSOLUTE MAXIMUM RATINGS
Characteristic Symbol
Value
Unit
Supply Voltage (V
CC
) V
CC
- 0.1 ~ + 3.0
V
Operating Temperature Range
T
opr
- 50 ~ + 50
o
C
Storage Temperature Range
T
stg
- 50 ~ + 125
o
C
ELECTRICAL CHARACTERISTICS
(Ta = 25
o
C, V
SS
= 0V, V
CC
= 1.5V unless otherwise specified)
Characteristic Symbol
Test
Condition
Min
Typ
Max
Unit
Operating Voltage
V
CC
1.20
1.50
2.00
V
Display Voltage
V
DD
3.00
V
Supply Current
I
CC
Measuring
(t
M
=0.1 sec)
50
80
A
I
STD
Operating
5
10
A