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IZ8005

型号：

IZ8005

描述：

体温计[ CLINICAL THERMOMETER ]

品牌：

INTEGRAL[ INTEGRAL CORP. ]

页数：

6 页

PDF大小：

234 K

下载PDF手册
IZ8005  
CLINICAL THERMOMETER  
General Description  
The IZ8005 is a CMOS digital clinical thermometer IC for measuring body temperature from  
32.00°C~43.00°C. It also provides alarm, self-test, auto power off and last time measured  
temperature functions. The other electronic components are LCD display, thermister, 1.5V battery,  
ON/OFF switch, buzzer, resistors and capacitors.  
Features  
• Single-chip CMOS construction  
• Single 1.5V battery operation  
• Measurement range: +32.00°C ~ +43.00°C  
Measurement accuracy: ±0.1°C  
Resolution: 0.01°C  
• Auto self-test  
• Alarm warning for fever  
• Highest temperature hold  
• Auto power off after 8 min 40 sec  
• One-key input switch for ON/OFF  
• Displays last time measured temperature  
Block Diagram  
1
IZ8005  
Pad Assignment  
37  
Chip size: 1.97 x 2.12 mm2  
* The IC substrate should be connected to VDD in the PCB layout artwork.  
2
IZ8005  
Pad Description  
Pad  
1~3  
4~6  
7~19  
Pad Name  
SA1~SA3  
SB1~SB3  
SC1~SC3  
I/O Function  
O
O
O
O
O
O
O
O
B
I
LCD segment drive  
LCD segment drive  
LCD segment drive  
10~12 SD1~SD3  
LCD segment drive  
LCD segment drive  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
SE1  
VEE  
CAP  
C512  
TV  
Generate negative voltage (–1.5V)  
For negative voltage, NMOS output  
For negative voltage, inverter output  
Test pin for IC  
TEST1  
LOWC  
VSS  
SC  
RF  
RS  
VDD  
PSW  
TEST2  
Test pin for IC  
B
I
For the supply voltage detector. Open the pin when not in use.  
Power supply GND  
B
O
O
I
Common point, NMOS open drain  
Connect reference resistor, PMOS open drain  
Connect sensor resistor, PMOS open drain  
Positive power supply  
I
Pull low input pin, push switch to turn the power on or off  
I
Pull low test pin, for production test, floating LCD displays the real time  
value, when connected to VDD, LCD displays the highest value.  
27  
28  
29  
30  
31  
32  
33  
34  
INIT  
ML  
I
Test pin for IC  
I
Connect to VDD for memory function, otherwise floating.  
Floating with fever function, otherwise connect to VDD.  
Floating buzzer is 4kHz, connect to VDD if buzzer is 8kHz.  
For system oscillator in  
FEVL  
S804KL  
OSCI  
OSCO  
BZ1  
I
I
I
O
O
O
O
For system oscillator out  
Buzzer output 1  
Buzzer output 2  
BZ2  
35~37 COM1~COM3  
LCD backplane drive, 3-level voltage out  
Absolute Maximum Ratings  
Supply voltage.......................0V to 2.0V  
Input voltage.............. VSS–0.5V to  
Storage Temperature.............–55°Cto  
VDD+0.5V  
Operation Temperature.......–20°C to +75°C  
+125°C  
Note: These are stress ratings only. Stresses exceeding the range specified under “Absolute  
Maximum Ratings” may cause substantial damage to the device. Functional operation of this  
device at other conditions beyond those listed in the specification is not implied and prolonged  
exposure to extreme conditions may affect device reliability.  
3
IZ8005  
Electrical Characteristics  
Symbol  
Parameter  
Test Conditions  
Min.  
Typ.  
Max. Unit  
VDD  
IDD  
ISTB  
FOSC  
R°C  
Operating Voltage  
Operating Current  
Standby Current  
—
1.3  
—
1.5  
60  
0.3  
32  
—
1.65  
100  
1.0  
38.4  
0.1  
V
VDD = 1.5V, No load  
VDD = 1.5V  
mkA  
mkA  
kHz  
°C  
—
Oscillating Frequency  
VDD = 1.5V, ROSC = 820kOhm  
—
25.6  
– 0.1  
Temperature Measurement  
Accuracy at Range 35°C~39°C  
LCD Electrode Pattern  
SA1  
SA2  
A1  
G1  
D1  
SA3  
B1  
C1  
—
SB1  
F2  
E2  
—
SB2  
A2  
G2  
D2  
SB3  
B2  
SC1  
F3  
E3  
—
SC2  
A3  
G3  
D3  
SC3  
B3  
C3  
—
SD1  
F4  
E4  
I4  
SD2  
SD3  
SE1  
COM1 F1  
COM2 E1  
COM3 H1  
A4  
G4  
D4  
B4  
C4  
H4  
A5  
B5  
C5  
C2  
H2  
Note: 1/3 duty, 1/2 bias (LCD uses 3V)  
Functional Description  
• Power sw: push switch to turn the power on or off.  
• When power on: push the switch, then it will generate a “beep” sound for 0.125 sec.  
a. First displays all the segments on for 2 sec.  
b. After a., as described above, then shows the last-time measured temperature for 2.8 sec.  
c. After b., shows the self-test temperature (37.00±0.01°C ) for 1 sec. The °C mark  
will flash at a speed of  
1Hz.  
d. After c., displays the highest measured temperature, then the °C mark will flash at a speed of 1Hz.  
e. If the temperature is < 32.00°C, the display shows Lo °C.  
f. If the temperature is . 43.00°C, the display shows Hi °C.  
g. The display always shows the higher temperature during the temperature measurement.  
h. If the measured temperature does not change for more than 8 sec, the measurement is over and  
the °C mark flash stops.  
i. When measurement is over, if the temperature > 37.50°C the buzzer alarms  
“beep-beep-beep---beep-beep-beep---” for 4 sec, as follows:  
BI  
———  
BI  
———  
BI  
——— ———  
(0.175S) (0.175S) (0.175S) (0.175S) (0.175S) (0.175S) (0.375S)  
if the temperature . 37.50°C, the buzzer alarms “beep-beep-beep-beep-” for 4 sec, as follows:  
BI  
——  
(0.5S) (0.5S)  
j. It will automatically turn the power off when measurement is over for 8 min 40 sec.  
k. When measurement is over, but if the temperature rises within 8 min 40 sec, the °C mark will flash  
again ( repeat from step 2-d), and starts to count 8 min 40 sec again.  
4
IZ8005  
l. When beep sound is on for 4 sec, the temperature is not measured.  
• When “Power OFF” type standby current is 0.3 mkA.  
• The frequency of the buzzer is 4kHz or 8kHz by pin option.  
• Fever alarm is pin option.  
• Measurement to 0.01 degree at °C.  
• Sensor use 503ET.  
• Reference resistor is the value (sensor in 37.00°C)  
• The low battery and “M” flag cannot display when the temperature shows Hi or Lo.  
•
When battery voltage is low, the battery mark “N” flashes at a speed of 1Hz and the  
measurement may not be accurate. The low voltage detect: 1.35V ± 0.05V.  
• During the process of mass production, in order to adjust the reference resistance (RF), let test 2  
be floating, the measured temperature will be the actual temperature of the measured environment. It can be  
up or down, not always the higher one.  
Flow Chart  
5
IZ8005  
Application Circuits  
IZ8005  
Notes:  
• Substrate connect to VDD.  
• VEE, CAP and C512 are externally connected to capacitors for stabilizing  
VEE (=1.5V).  
• BZ1 and BZ2 are connected to an external Buzzer for generating sounds.  
• LOWC is connected to an external resistor for adjusting the detector level of a low  
voltage detector. Open the pin when not in use.  
• OSCI, OSCO are connected to an external resistor, and form an RC oscillator  
with a built-in capacitor for SYSTEM clock (=32kHz)  
•
RS, RF, SC constitute an alternating RC oscillator, which allows one  
oscillator, namely RS or RF, active at a time.  
• REF (reference resistor) is a resistor value equal to 503ET sensor in 37.00°C.  
• SENSOR is a 503ET thermistor.  
6
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