HT7510

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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/Fahrenheitmeasurement

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Highest temperature hold

Auto power off after 8 min. 40 secOne key input switch ON/OFF

Display the last measured temperatureLow voltage detection for 2.4V

Interface with HT84018-0D to provide voicereport function (Refer to HT84XXX datasheet for detail specification)

General Description

The HT7510 is a CMOS digital clinical ther-mometer IC for measuring body temperature inCentigrade (°C) or Fahrenheit (°F) mode by itsbonding option. The main function of HT7510 isthe same as HT7500. When interfaced with

HT84018-0D, HT7510 can provide voice reportfunction. It also provides alarm and auto power offfunctions. The other electronic components areLCD display, thermister, 3.0V battery, ON/OFFswitch, buzzer, resistors and capacitors.

Block Diagram

110th Feb ’99

HT7510Pad Assignment

HT7510

HT84018

Chip size: 132 × 121 (mil)2

* The IC substrate should be connected to VDD in the PCB layout artwork.

Chip size: 2735 × 1835 (µm)2

* The IC substrate should be connected to VSS in the PCB layout artwork.

210th Feb ’99

HT7510Pad Coordinates

HT7510

Unit: mil

Pad No.123456789101112131415161718HT84018

X–59.50–59.58–59.58–59.58–59.58–59.58–59.24–57.88–51.26–44.63–37.99–16.28–3.836.8013.4320.0626.6960.05Y18.786.38–2.00–13.98–20.61–32.81–39.87–53.42–53.42–53.42–53.42–53.47–53.47–54.06–54.06–54.06–54.06–54.06Pad No.192021222324252627282930313233343536X60.0559.8859.8859.8859.8859.8859.8859.8859.8859.8844.9738.3317.38–4.89–11.52–23.93–30.56–42.97Y–47.43–5.740.8914.0720.7027.3333.9640.5947.2253.8554.6154.6153.9753.6353.8553.8553.8553.85Unit: µm

Pad No.123456789X–1125.31–1177.49–939.68–689.05–503.45–352.65–167.05–16.25169.35Y249.74–263.79–749.61–639.24–639.24–639.24–639.24–639.24–639.24Pad No.101112131415161718X320.15505.75656.55842.15992.951178.551167.431167.531167.53Y–639.24–639.24–639.24–639.24–639.24–639.24–382.18–242.0899.04310th Feb ’99

HT7510Pad Description

Pad No.123456789101112131415161718~2021~2324~2627~2930313233343536Pad NameLOWCVSSSCRFRSVDDPSWTEST2CLFHOSCIOSCOBZ1BZ2ENDATAREADYBUSYCOM1~COM3SA1~SA3SB1~SB3SC1~SC3SD1CAP15VC512TVTEST1TTMTS816I/OBIBOOIIIIIOOOOOOIOOOOOOOBIIIDescriptionFor low voltage detector, open the pin when not in use.Power supply GNDCommon point, NMOS open drainConnect reference resistor, PMOS open drainConnect sensor resistor, PMOS open drainPower supply positivePull-low input pin, press switch to turn the power on or offPull-low test pin, for production, floating test, LCD displaysthe real time value, when connected to VDD, LCD displaysthe highest value.Connecting VSS for °C, connect to VDD for °FFor system oscillator inFor system oscillator outBuzzer output 1Buzzer output 2Interface with HT84018-0DInterface with HT84018-0DInterface with HT84018-0DInterface with HT84018-0DLCD backplane drive, 3 level voltage outLCD segment driveLCD segment driveLCD segment driveLCD segment drive1.5V output for LCD displayTest pin for IC (512Hz output)Test pin for ICTest pin for ICTest pin for ICTest pin for IC410th Feb ’99

HT7510Absolute Maximum Ratings

Supply voltage.......................................0V to 5VInput voltage..................VSS–0.5V to VDD+0.5V

Operation Temperature.............–20°C to +75°CStorage Temperature................–55°Cto +125°C

Note: These are stress ratings only. Stresses exceeding the range specified under “Absolute Maxi-mum Ratings” may cause substantial damage to the device. Functional operation of this deviceat other conditions beyond those listed in the specification is not implied and prolongedexposure to extreme conditions may affect device reliability.

Electrical Characteristics

SymbolVDDIDDISTBfOSCR°CR°FTa=25°C

ParameterOperating VoltageOperating CurrentStandby CurrentOscillating FrequencyTemperature MeasurementAccuracy at Range 35°C~39°CTemperature MeasurementAccuracy at Range 95°F~102°FTest ConditionsVDD—3V3V3V——Conditions—No load—ROSC=1MΩ——min.2.2——25.6–0.1–0.2Typ.3.0200—32——Max.Unit3.63001.038.40.10.2VµAµAkHz°C°FLCD Electrode Pattern

SA1COM1COM2COM3F1E1H1SA2A1G1D1SA3B1C1—SB1F2E2—SB2A2G2D2SB3B2C2H2SC1F3E3—SC2A3G3D3SC3B3C3H3SD1A4B4C4Note: 1/3 duty, 1/2 bias (LCD uses 3V)Interface with HT84018-0D

510th Feb ’99

HT7510Functional 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 thetemperature rises within 8 min. 40 sec, the°C (or °F) mark will flash again (repeatfrom step 2-d), and starts to count againuntil 8 min. 40 sec.l. When beep sound is on for 4 sec, the tem-perature is not measured.

•When power is off: the standby current ≤ 1µA.• 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 lastreading for 2 sec.c. After b. shows L °C (or °F ) for 0.75 sec.d. After c. displays the measurement tem-perature, the °C (or °F) mark will flash at aspeed of 1Hz.e. If the temperature < 32 °C (or 90 °F), thedisplay shows L °C (or °F).f. If the temperature ≥ 42 °C (or 108 °F), thedisplay shows H °C (or °F).g. The display always show the higher tem-perature during the measurement.h. If the measured temperature does notchange for more than 16 sec, the measure-ment is over and the °C (or °F) mark flashstops.i. When measurement is over, if the tempera-ture > 37.5 °C (or 99.5 °F),the buzzer alarms

“∇” flashes at a speed of 1 Hz and the meas-urement may not be accurate. The low voltagedetect: 2.4V ± 0.05V.

•During the process of mass production, in or-

der to adjust the reference resistance (RF), lettest 2 be floating, the measured temperaturewill be the actual temperature of the meas-ured environment. It can be up or down, notalways the higher one.

Selection table for clinical thermometer“Beep-Beep-Beep---Beep-Beep-Beep---” for4 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.HT84018-0DVoice LanguageEnglish610th Feb ’99

Flow Chart (HT7510/HT84018-0D)

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 voltagedetector. Open the pin when not in use.

OSCI, OSCO are connected to an external resistor, and form an RC oscillator with a built-incapacitor for SYSTEM clock (32kHz)

RS, RF, SC constitute an alternating RC oscillator, which allows one oscillator, namely RS orRF, active at a time.

REF (reference resistor) is a resistor value equal to 503ET sensor in 37.0 °C or 98.6°FRENSOR is a 503ET thermistor.S3 (open=for °F, short=for °C)