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HT7510 Clinical Thermometer
Features
* *
* *
Single-chip CMOS construction Measurement range: +32.0C~+42.0C (+90.0~+108.0F) Measurement accuracy: 0.1C (0.2F) Resolution: 0.1C (0.1F) 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
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 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.
Block Diagram
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HT7510
Pad Assignment
HT7510
Chip size: 132 x 121 (mil)2 * The IC substrate should be connected to VDD in the PCB layout artwork.
HT84018
Chip size: 2735 x 1835 (m)2 * The IC substrate should be connected to VSS in the PCB layout artwork.
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HT7510
Pad Coordinates
HT7510
Unit: mil
Pad No.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
HT84018
X
-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
Y
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
Pad No.
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
X
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
Y
-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: m
Pad No.
1 2 3 4 5 6 7 8 9
X
-1125.31 -1177.49 -939.68 -689.05 -503.45 -352.65 -167.05 -16.25 169.35
Y
249.74 -263.79 -749.61 -639.24 -639.24 -639.24 -639.24 -639.24 -639.24
Pad No.
10 11 12 13 14 15 16 17 18
X
320.15 505.75 656.55 842.15 992.95 1178.55 1167.43 1167.53 1167.53
Y
-639.24 -639.24 -639.24 -639.24 -639.24 -639.24 -382.18 -242.08 99.04
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HT7510
Pad Description
Pad No.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18~20 21~23 24~26 27~29 30 31 32 33 34 35 36
Pad Name
LOWC VSS SC RF RS VDD PSW TEST2 CLFH OSCI OSCO BZ1 BZ2 EN DATA READY BUSY COM1~COM3 SA1~SA3 SB1~SB3 SC1~SC3 SD1 CAP15V C512 TV TEST1 TTM TS816
I/O
B I B O O I I I I I O O O O O O I O O O O O O O B I I I
Description
For low voltage detector, open the pin when not in use. Power supply GND Common point, NMOS open drain Connect reference resistor, PMOS open drain Connect sensor resistor, PMOS open drain Power supply positive Pull-low input pin, press switch to turn the power on or off Pull-low test pin, for production, floating test, LCD displays the real time value, when connected to VDD, LCD displays the highest value. Connecting VSS for C, connect to VDD for F For system oscillator in For system oscillator out Buzzer output 1 Buzzer output 2 Interface with HT84018-0D Interface with HT84018-0D Interface with HT84018-0D Interface with HT84018-0D LCD backplane drive, 3 level voltage out LCD segment drive LCD segment drive LCD segment drive LCD segment drive 1.5V output for LCD display Test pin for IC (512Hz output) Test pin for IC Test pin for IC Test pin for IC Test pin for IC
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HT7510
Absolute Maximum Ratings
Supply voltage....................................... 0V to 5V Input voltage ..................VSS-0.5V to VDD+0.5V Operation Temperature............. -20C to +75C Storage Temperature................ -55Cto +125C
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.
Electrical Characteristics
Symbol
VDD IDD ISTB fOSC RC RF
Ta=25C
Parameter
Operating Voltage Operating Current Standby Current Oscillating Frequency Temperature Measurement Accuracy at Range 35C~39C Temperature Measurement Accuracy at Range 95F~102F
Test Conditions VDD
-- 3V 3V 3V -- --
Conditions
-- No load -- ROSC=1M -- --
min.
2.2 -- -- 25.6 -0.1 -0.2
Typ.
3.0 200 -- 32 -- --
Max. Unit
3.6 300 1.0 38.4 0.1 0.2 V
A A
kHz
C F
LCD Electrode Pattern
SA1 COM1 COM2 COM3 F1 E1 H1
SA2 A1 G1 D1
SA3 B1 C1 --
SB1 F2 E2 --
SB2 A2 G2 D2
SB3 B2 C2 H2
SC1 F3 E3 --
SC2 A3 G3 D3
SC3 B3 C3 H3
SD1 A4 B4 C4
Note: 1/3 duty, 1/2 bias (LCD uses 3V)
Interface with HT84018-0D
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HT7510
Functional Description
The following description is for HT7510 only.
* Power switch: press switch to turn the power
j. If the measurement is over 8 min. 40 sec. the power will automatically turn off 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. l. When beep sound is on for 4 sec, the temperature is not measured.
* When power is off: the standby current 1A. * The frequency of the buzzer is 5.3kHz * Bonding option: C or F. * Measurement to 0.1 degree in either C or F. * Sensor use 503ET. * Reference resistor value (sensor in 37.0 C) * When battery voltage is low, the battery mark
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. c. After b. shows L C (or F ) for 0.75 sec. d. After c. displays the measurement temperature, the C (or F) mark will flash at a speed of 1Hz. e. If the temperature < 32 C (or 90 F), the display shows L C (or F). f. If the temperature 42 C (or 108 F), the display shows H C (or F). g. The display always show the higher temperature during the measurement. 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. i. When measurement is over, if the temperature > 37.5 C (or 99.5 F),the buzzer alarms
"" flashes at a speed of 1 Hz and the measurement may not be accurate. The low voltage detect: 2.4V 0.05V.
* 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.
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:
Part No.
HT84018-0D
Voice Language
English
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HT7510
Flow Chart (HT7510/HT84018-0D)
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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 98.6F RENSOR is a 503ET thermistor. S3 (open=for F, short=for C)
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