AL7102B
Fast Clinical Thermometer
Ver.01.0
Features
_°C/°F selection by On/Off (PSW) key( when
KCF=Low)
_Initial °C/°F selection by bonding option (CHFL)
_Resolution selection: 0.1°C/0.1°F
_Multi stable time selection: 4s/8s/16s/32s
_Buzzer output: 5.3KHz/8KHz by bonding option
(TONE8K)
_Measurement range: 32.0°C ~42.9°C (90°F ~
109.9°F)
_Measurement accuracy: ±0.1°C(±0.2°F)
_Highest temperature hold
_Round off function
_2 automatic power off modes(10 mins / 1 min)
_One ON/OFF(PSW) switch input key
_Display the last time measured temperature
_Alarm warning for fever
General Description
The AL7102B is CMOS digital clinical thermometer IC for
measuring body temperature from 32.0°C ~ 42.9°C (90°F
~ 109.9°F). It also provides stable alarm, fever alarm, the
last time measured temperature memory & automatic
power off function.
Block Diagram
System
Oscillator
Counter and
Comparator
Bat Low
detecting &
Buzzer
Voltage
Control Doubler
Circuit
Pulse
Counter LCD
Display
Sensor
Oscillation
S1
--
S9
VCC
CAP1
CAP2
COM1
--
COM3
OSCI
OSCO BZ1
BZ2
LVI
RF
RS
VDD
VSS
CHFL
PSW
TP1
SC
STABLE1
STABLE2
KCF
TONE8
K
S13
AL7102B
Ver.11.0
Pad Description
Pad Name I/O Function
S1 ~ S9,S13 O LCD segment driver
VCC O Generated 3V voltage
CAP1 O For positive voltage pumping, NMOS open drain output
CAP2 O For positive voltage pumping, inverter output
CHFL I
°C or °F mode selection for power on initial state
CHFL= Open or VDDΚ°C
CHFL= VSSΚ°F
LVI I/O For the supply voltage detector
VSS — Negative power supply
SC I/O Common point, NMOS open drain
RF O Connect to reference resistor, PMOS open drain
RS O Connect to sensor resistor, PMOS open drain
VDD — Positive power supply (1.5V)
PSW I Power ON/OFF input, toggle active
TP1 I
Test Pin.
TP1=Open or VDD: LCD display the highest value
TP1=VSS: LCD display the real time value
TONE8K I
Tone selection pin
TONE8K = Open or VDDΚ8KHz tone out
TONE8K = VSSΚ5.3KHz tone out
STABLE1
STABLE2 I
Stable time selection (STABLE1& STABLE2 are bonding options)
ST STABLE1 STABLE2
4 sec VSS VDD or Open
8 sec VDD or Open VSS
16 sec VDD or Open VDD or Open
32 sec VSS VSS
KCF I
KCF=Open or VDD: The unit can not be exchanged by the PSW after power on.
KCF=VSS: If the PSW switch was pushed more than 2 sec after power-on, the unit °C(°F) will
be exchanged.
OSCI I For system oscillator input
OSCO O For system oscillator output
BZ1 O Buzzer output 1
BZ2 O Buzzer output 2
COM1 ~ COM3 O LCD common driver
Absolute Maximum Ratings
Supply voltage.......................................... 0V to 2.0V
Input voltage....................... VSS–0.5V to VDD+0.5V
Operation Temperature.......................... –20°C to +75°C
Storage Temperature............................. –55°C to +125°C
AL7102B
Ver.21.0
Electrical Characteristics
Symbol Parameter Test Conditions
VDDConditions
Min. Typ. Max. Unit
VDDOperating Voltage¾ ¾1.3 1.5 1.65 V
IDDOperating Current 1.5V No Load¾25 50_A
ISTBStandby Current 1.5V OSC OFF¾ ¾1.0_A
fOSCOscillation Frequency 1.5V ROSC=1.1M_25 32 38 KHz
RBAT1Battery low resistor¾Vlow=1.25+/-0.05V¾300¾Kohm
R°C Temperature Measurement Accuracy at
Range 35°C ~ 39°C¾VDD=1.3V~1.5V – 0.1¾0.1 °C
R°F Temperature Measurement Accuracy at
Range 95°F ~ 102°F¾VDD=1.3V~1.5V – 0.2¾0.2 °F
LCD Electrode Pattern 1–
Name¾ ¾ ¾S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13
COM1 COM1¾ ¾F1 A1 B1 F2 A2 B2 F3 A3 B3 A5
COM2¾COM2¾E1 G1 C1 E2 G2 C2 E3 G3 C3 B5
COM3¾ ¾COM3 H1 D1 D2 H2 H4 D3 I4 C5
Note: The LCD uses 3V and 1/3 duty, 1/2 bias
For one-digital decimal: COM1, COM2, COM3, S1, S2, S3, S4, S5, S6, S7, S8, S9, S13.
AL7102B
Ver.31.0
Functional Description
_Power SW: push PSW switch to power on or power off.
_When power on: push the switch, a "BI" sound for 0.125sec will be generated.
_When power off: push the switch, a "BI" sound for 0.125sec will be generated.
_When power off: the stand-by current?1μA.
_The frequency of buzzer is 5.3KHz or 8KHz
_Sensor use 503ET.
_When battery voltage is low (1.25V ±0.05V), the battery-low icon flashes at the speed of 1Hz , the buzzer alarm will
be disabled & the measure display will be blanked.
_During the process of mass production, in order to adjust the reference resistance (RF). The low TP1 pin connects to
VSS, the measured temperature will be the actual temperature. The LCD can be up or down changed, not always
show the higher one.
_There are 4 kinds of stable time to be selected; 4 sec, 8 sec, 16 sec and 32 sec.
_The stable time start counting when temperature is more than 32.0°C or 90.0°F and the temperature is kept on stable.
a. The LCD firstly all segments are on about 2 sec.
b. When KCF is connected with VSS and the PSW switch was pushed over 2 sec after power-on, then °C(°F) unit will be
exchanged.
c. After a. The LCD shows the last-time temperature about 1sec.
d. After b., The LCD shows the self-test temperature (37.0±0.1к) is around 1 sec. The °C(°F) mark will flash at the
speed of 1Hz.
e. After c., LCD shows the higher measured temperature always, the °C(°F) mark will flash at the speed of 1Hz.
f. If the temperature < 32.0°C (or 90.0°F), the display show Lo °C (or Lo °F).
g. The system will auto power off if the temperature keep Lo (< 32.0°C or 90.0°F) or system error ( LCD show “err”)
more than 60 sec.
h. If the temperature?43.0 °C (or 109.9°F), The display show Hi °C (or Hi °F).
i. The LCD always shows the highest temperature during the temperature measurement.
j. After power on, the measured temperature does not change within the stable time, the measurement will be
terminated and the °C(°F) mark flash stop. ( The temperature must more than 32.0°C or 90.0°F)
k. For AL7102B when measurement is stop and if the temperature?37.8°C (100°F). In this case the buzzer alarms
tone “BI-BI-BI--- BI-BI-BI---” for 10 sec, as follows:
BI --- BI --- BI ---------- BI ---
BI: 0.125sec
---: 0.125sec
-----------: 0.375sec
if the temperature < 37.80°C (100°F), the buzzer alarms “BI-BI-BI-BI-” for 10 sec, as follows:
BI --- BI---
BI: 0.5sec
---: 0.5sec
l. It will automatically power off after measurement is stable and the system is still on more than 10 minutes (at Fsys =
32kHz) ( The final temperature must more than 32.0°C or 90.0°F)
m. When the measurement is terminated and the beep sound is stop, the measurement will start again if the temperature
continue rising before auto-power-off. But the °C (or °F) mark will not flash and the buzzer will not output also.
n. It will show ” Err”, when the sensor or reference resistor is open or short.
o. During bi sound is on 10 sec, the temperature is not measurement.
Time STABLE1 STABLE2
4 sec VSS VDD/ or open
8 sec VDD/or open VSS
16 sec VDD/or open VDD/or open
32 sec VSSVSS
AL7102B
Ver.41.0
Flow Chart
P ower O n
D is p la y A ll S e gm en t s
D is p la y L a s t Me a s u re d
Tem p e ra tu re
D is p la y
3 7. 0C
Me a s u re
D is p la y th e
H ig h e s t V a lu e
D is p la y
n o t c h a n g e m o re
th a n s ta b le
t im e
Tem p e rat u re
ris e s with in
10 m in
D is p la y
Hi
D is p la y
L o
No
Y e
s
Y e
s
No
V alu e < 3 2C
P u s h P SW s wit c h
1 s e c
C N o t F la s h f or 1 0 s e c
1 s e c
D is p la y th e
H ig h e s t V a lu e
Tim e is u p ?
P owe r O F F
No
Y e
s
Y e s
No
P u s h P SW s wit c h o v e r 2 s e c s
No
Y e
s
D is p la y L a s t Me as u red
Tem p e ra tu re a n d th e u n it
(C/_) will c h a n g e
Tem p era tu re >
3 7 . 8C
A la rm
No
Y e s
F e v e r A la rm
S e n so r o p e n /
S h o w sh o rt te st
_
E rr
_
Y e s
A fte r 6 0 se c No
A
B
A
B
KC F =VD D o r F ola t in g
C
C
D
Y e
s
No
D
B
2 s e c o n d s
Tim e is u p ?
E xam p l e fo rC m o de
V a lu e > 43C
AL7102B
Ver.51.0
Application Circuit
Note:
REF=30.01k_
C*=2700~3300pF
C** = 104
AL7102B
Ver.61.0
Pad Assignment
Chip size = 1400*1280(um*um)
Note: The IC substrate should be connect to VSS
Pad Coordinates
Pad No. Pad Name X(mm) Y(mm) Pad No. Pad Name X(mm) Y(mm)
1 S1 80 1225 18 RF 1225 215
2 S2 80 965 19 RS 1225 340
3 S3 80 840 20 VDD 1225 465
4 S4 80 715 21 PSW 1225 590
5 S5 80 590 22 TP1 1225 715
6 S6 80 465 23 TONE8K 1225 840
7 S7 80 340 24 STABLE1 1225 965
8 S8 80 215 25 STABLE2 1225 1100
9 S9 80 80 26 KCF 1090 1100
10 S13 215 80 27 OSCI 965 1100
11 VCC 340 80 28 OSCO 840 1100
12 CAP1 465 80 29 BZ1 715 1100
13 CAP2 590 80 30 BZ2 590 1100
14 CHFL 715 80 31 COM1 465 1100
15 LVI 840 80 31 COM2 340 1100
16 VSS 965 80 33 COM3 215 1100
17 SC 1225 80
