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Details, datasheet, quote on part number:HT7500
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Datasheet text preview:
HT7500 Clinical Thermometer
Features
· Single-chip CMOS construction · Single 1.5V battery operation · Measurement range: +32.0~+42.0°C · Alarm warning for fever · Highest temperature hold · Auto power off after 8 min 40 sec · One-key input switch for ON/OFF · Displays last time measured temperature
(+90.0~+108.0°F) Measurement accuracy: ±0.1°C (±0.2°F) Resolution: 0.1°C (0.1°F)
· Bonding option for Centigrade/Fahrenheit measure-
ment
General Description
The HT7500 is a CMOS digital clinical thermometer IC for measuring body temperature in Centigrade (°C) or Fahrenheit (°F) mode by its bonding option. It also provides alarm and auto power off functions. The other electronic components are LCD display, thermister, 1.5V battery, ON/OFF switch, buzzer, resistors and capacitors.
Block Diagram
OSCI OSCO TEST2 PSW CL.H R. RS SC VDD VSS
S y s te m OSC
C o u n te r a n d C o m p a ra to r
T IM E R
LO W C BZ1 BZ2 C512 CAP VEE
C o n tro l C ir c u it
V o lta g e D o u b le r C o u n te r , C o m p a ra to r a n d L a tc h
S ensor OSC
P u ls e G e n e ra to r
P u ls e T a b le
L C D D r iv e r
CO M 1~3 SA1~SD1
TV
T IM
TEST1
TS816
Rev. 1.10
1
November 27, 2001
HT7500
Pad Assignment
TEST1 TS816 33 C512 CAP SD1 VEE SC3 T IM 32 TV 30
31
29
28
27 26
25 24 23 22 21 SC2 SC1 SB3 SB2 SB1 SA3 SA2 SA1
LO W C 1 2 3 4 5 6 VSS SC R. RS VDD PSW
20 (0 ,0 ) 19 18 17
7 8 9 10 OSCI 11 OSCO 12 BZ1 13 BZ2 14 COM1 15 COM2 16 COM3
* The IC substrate should be connected to VDD in the PCB layout artwork.
CL.H TEST2
Chip size: 129 ´ 120 (mil)2
Pad Coordinates
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 X -58.61 -58.61 -58.61 -58.61 -58.61 -58.61 -58.61 -57.25 -50.62 -43.99 -37.36 -15.64 -3.19 7.44 26.05 58.48 58.82 Y 18.57 6.16 -1.49 -13.30 -20.95 -33.02 -40.08 -53.63 -53.63 -53.63 -53.63 -53.34 -53.34 -52.66 -52.66 -48.75 -7.14 Pin No. 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 X 58.82 58.82 58.82 58.82 58.82 58.82 58.82 46.24 38.59 31.96 24.82 7.39 -0.43 -14.28 -23.63 -42.33
Unit: mil Y 0.51 8.24 15.90 23.63 31.28 39.01 46.67 54.06 54.06 54.06 54.06 54.06 53.29 53.29 53.29 53.29
Rev. 1.10
2
November 27, 2001
HT7500
Pad Description
Pad No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14~16 17~19 20~22 23~25 26 27 28 29 30 31 32 33 Pad Name LOWC VSS SC RF RS VDD PSW TEST2 CLFH OSCI OSCO BZ1 BZ2 COM1~COM3 SA1~SA3 SB1~SB3 SC1~SC3 SD1 VEE CAP C512 TV TEST1 TIM TS816 I/O B ¾ B O O ¾ I I I I O O O O O O O O O O O B I I I Function For the supply voltage detector, open the pin when not in use. Negative power supply, GND Common point, NMOS open drain Connect reference resistor, PMOS open drain Connect sensor resistor, PMOS open drain Positive power supply Pull-low input pin, push switch to turn power on or off Pull-low test pin, for production test, floating LCD displays the real time value, when connected to VDD, LCD displays the highest value. Floating for °C, connect to VDD for °F For system oscillator in For system oscillator out Buzzer output 1 Buzzer output 2 LCD backplane drive, 3-level voltage out LCD segment drive LCD segment drive LCD segment drive LCD segment drive Generate negative voltage (-1.5V) For negative voltage, NMOS output For negative voltage, inverter output Test pin for IC Test pin for IC Test pin for IC Test pin for IC
Absolute Maximum Ratings
Supply voltage.....0V to 2.0V Input voltage ......VSS-0.5V to VDD+0.5V Operation Temperature ......-2.0°C to +75°C Storage Temperature ..-55°C to +125°C
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² 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.
Rev. 1.10
3
November 27, 2001
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