BT8016
1
3.5 DIGIT THERMOMETER
DESCRIPTION
The BT8016 is a CMOS circuit provided with digital thermometer function.
Temperature reading from 50
o
C to +50
o
C is detected by use of a thermistor as a sensor
and temperature is displayed on a LCD by 0.2
o
C step. High accuracy is obtained in wide
range of 50
o
C ~ +50
o
C by providing non-linear correction circuit on the chip.
FEATURES
Measurement accuracy: 1
o
C
Resolution : 0.2
o
C (
o
F)
3
1
/
2
+ 7 Indicators, 3
1
/
2
duty LCD
Low power consumption
Few external components
Easiness in adjustment
Single 1.5V battery operation
Package Type: Bare chip
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 1 seconds, 3 seconds, 5
seconds,
10 seconds (Default 10 sec)
Oscillation Frequency 32.768 kHz
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
LCD Voltage
V
DD
3.00
V
Supply Current
I
CC
Operating
50 80
A
I
STD
Standby
5 10
A
BT8016
2
SERIAL OUTPUT
Temperature data converted serially by MD, SHCK INT, PUR terminals.
Temperature data is output a total 15-bits data.
INT (TO CPU)
PUR
BT8016 measur e the temperature once
(FROM CPU)
FINISH
SHCK (FROM CPU)
MD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Bit No.
Function
Remark
01
Polarity
Polarity (1= Minus; 0 = Plus)
02
(Hundred digit) (
o
C no use)
03 80
04 40
05 20
06 10
07 8
08 4
09 2
10 1
11 0.8
12 0.4
13 0.2
14 0.1
15 (
o
C/
o
F) (0
=
o
C; 1 =
o
F)
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