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