HOLTEK HT7510

HT7510
Clinical Thermometer
Features
•
•
•
•
•
•
•
•
•
•
Single-chip CMOS construction
Measurement range: +32.0°C~+42.0°C
(+90.0~+108.0°F)
Measurement accuracy: ±0.1°C (±0.2°F)
Resolution: 0.1°C (0.1°F)
Single 3.0V battery operation
Bonding option for Centigrade/Fahrenheit
measurement
Highest temperature hold
Auto power off after 8 min. 40 sec
One key input switch ON/OFF
Display the last measured temperature
Low voltage detection for 2.4V
Interface with HT84018-0D to provide voice
report function (Refer to HT84XXX data
sheet for detail specification)
General Description
HT84018-0D, HT7510 can provide voice report
function. It also provides alarm and auto power off
functions. The other electronic components are
LCD display, thermister, 3.0V battery, ON/OFF
switch, buzzer, resistors and capacitors.
The HT7510 is a CMOS digital clinical thermometer IC for measuring body temperature in
Centigrade (°C) or Fahrenheit (°F) mode by its
bonding option. The main function of HT7510 is
the same as HT7500. When interfaced with
Block Diagram
1
10th Feb ’99
HT7510
Pad Assignment
HT7510
Chip size: 132 × 121 (mil)2
* The IC substrate should be connected to VDD in the PCB layout artwork.
HT84018
Chip size: 2735 × 1835 (µm)2
* The IC substrate should be connected to VSS in the PCB layout artwork.
2
10th Feb ’99
HT7510
Pad Coordinates
Unit: mil
HT7510
Pad No.
X
Y
Pad No.
X
Y
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
–59.50
–59.58
–59.58
–59.58
–59.58
–59.58
–59.24
–57.88
–51.26
–44.63
–37.99
–16.28
–3.83
6.80
13.43
20.06
26.69
60.05
18.78
6.38
–2.00
–13.98
–20.61
–32.81
–39.87
–53.42
–53.42
–53.42
–53.42
–53.47
–53.47
–54.06
–54.06
–54.06
–54.06
–54.06
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
60.05
59.88
59.88
59.88
59.88
59.88
59.88
59.88
59.88
59.88
44.97
38.33
17.38
–4.89
–11.52
–23.93
–30.56
–42.97
–47.43
–5.74
0.89
14.07
20.70
27.33
33.96
40.59
47.22
53.85
54.61
54.61
53.97
53.63
53.85
53.85
53.85
53.85
Unit: µm
HT84018
Pad No.
X
Y
Pad No.
X
Y
1
2
3
4
5
6
7
8
9
–1125.31
–1177.49
–939.68
–689.05
–503.45
–352.65
–167.05
–16.25
169.35
249.74
–263.79
–749.61
–639.24
–639.24
–639.24
–639.24
–639.24
–639.24
10
11
12
13
14
15
16
17
18
320.15
505.75
656.55
842.15
992.95
1178.55
1167.43
1167.53
1167.53
–639.24
–639.24
–639.24
–639.24
–639.24
–639.24
–382.18
–242.08
99.04
3
10th Feb ’99
HT7510
Pad Description
Pad No.
Pad Name
I/O
Description
1
LOWC
B
For low voltage detector, open the pin when not in use.
2
VSS
I
Power supply GND
3
SC
B
Common point, NMOS open drain
4
RF
O
Connect reference resistor, PMOS open drain
5
RS
O
Connect sensor resistor, PMOS open drain
6
VDD
I
Power supply positive
7
PSW
I
Pull-low input pin, press switch to turn the power on or off
8
TEST2
I
Pull-low test pin, for production, floating test, LCD displays
the real time value, when connected to VDD, LCD displays
the highest value.
9
CLFH
I
Connecting VSS for °C, connect to VDD for °F
10
OSCI
I
For system oscillator in
11
OSCO
O
For system oscillator out
12
BZ1
O
Buzzer output 1
13
BZ2
O
Buzzer output 2
14
EN
O
Interface with HT84018-0D
15
DATA
O
Interface with HT84018-0D
16
READY
O
Interface with HT84018-0D
17
BUSY
I
Interface with HT84018-0D
18~20
COM1~COM3
O
LCD backplane drive, 3 level voltage out
21~23
SA1~SA3
O
LCD segment drive
24~26
SB1~SB3
O
LCD segment drive
27~29
SC1~SC3
O
LCD segment drive
30
SD1
O
LCD segment drive
31
CAP15V
O
1.5V output for LCD display
32
C512
O
Test pin for IC (512Hz output)
33
TV
B
Test pin for IC
34
TEST1
I
Test pin for IC
35
TTM
I
Test pin for IC
36
TS816
I
Test pin for IC
4
10th Feb ’99
HT7510
Absolute Maximum Ratings
Supply voltage....................................... 0V to 5V
Operation Temperature............. –20°C to +75°C
Input voltage ..................VSS–0.5V to VDD+0.5V
Storage Temperature................ –55°Cto +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.
Ta=25°C
Electrical Characteristics
Symbol
Test Conditions
Parameter
VDD
Operating Voltage
—
IDD
Operating Current
3V
ISTB
Standby Current
3V
fOSC
Oscillating Frequency
3V
R°C
Temperature Measurement
Accuracy at Range 35°C~39°C
—
R°F
Temperature Measurement
Accuracy at Range 95°F~102°F
—
min.
Conditions
VDD
—
Typ.
Max. Unit
2.2
3.0
3.6
V
—
200
300
µA
—
—
1.0
µA
25.6
32
38.4
kHz
—
–0.1
—
0.1
°C
—
–0.2
—
0.2
°F
No load
—
ROSC=1MΩ
LCD Electrode Pattern
SA1
SA2
SA3
SB1
SB2
SB3
SC1
SC2
SC3
SD1
COM1
F1
A1
B1
F2
A2
B2
F3
A3
B3
A4
COM2
E1
G1
C1
E2
G2
C2
E3
G3
C3
B4
COM3
H1
D1
—
—
D2
H2
—
D3
H3
C4
Note: 1/3 duty, 1/2 bias (LCD uses 3V)
Interface with HT84018-0D
5
10th Feb ’99
HT7510
Functional Description
The following description is for HT7510 only.
j. If the measurement is over 8 min. 40 sec.
the power will automatically turn off
• Power switch: press switch to turn the power
k. When the measurement is over and the
temperature rises within 8 min. 40 sec, the
°C (or °F) mark will flash again (repeat
from step 2-d), and starts to count again
until 8 min. 40 sec.
on or off.
• When power is on: press the switch, then it will
generate a “beep” sound for 0.125 sec.
a. Displays all the segments first for 2 sec.
b. After a. shows the temperature of the last
reading for 2 sec.
l. When beep sound is on for 4 sec, the temperature is not measured.
c. After b. shows L °C (or °F ) for 0.75 sec.
• When power is off: the standby current ≤ 1µA.
d. After c. displays the measurement temperature, the °C (or °F) mark will flash at a
speed of 1Hz.
• The frequency of the buzzer is 5.3kHz
• Bonding option: °C or °F.
e. If the temperature < 32 °C (or 90 °F), the
display shows L °C (or °F).
• Measurement to 0.1 degree in either °C or °F.
f. If the temperature ≥ 42 °C (or 108 °F), the
display shows H °C (or °F).
• Reference resistor value (sensor in 37.0 °C)
• Sensor use 503ET.
• When battery voltage is low, the battery mark
g. The display always show the higher temperature during the measurement.
“∇” flashes at a speed of 1 Hz and the measurement may not be accurate. The low voltage
detect: 2.4V ± 0.05V.
h. If the measured temperature does not
change for more than 16 sec, the measurement is over and the °C (or °F) mark flash
stops.
• During the process of mass production, in or-
der 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.
i. When measurement is over, if the temperature > 37.5 °C (or 99.5 °F),the buzzer alarms
Selection table for clinical thermometer
“Beep-Beep-Beep---Beep-Beep-Beep---” for
4 sec, as follows:
if the temperature ≤ 37.5 °C (or 99.5 °F),
the buzzer alarms “Beep-Beep-Beep-Beep” for 4 sec, as follows:
6
Part No.
Voice Language
HT84018-0D
English
10th Feb ’99
HT7510
Flow Chart (HT7510/HT84018-0D)
7
10th Feb ’99
HT7510
Application Circuits
Notes: HT7510’s substrate connected to VDD and HT84018-0D’s substrate connected to VSS.
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 37.0 °C or 98.6°F
RENSOR is a 503ET thermistor.
S3 (open=for °F, short=for °C)
8
10th Feb ’99