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NCT47 High Precision Temperatureto-Voltage Converter
The NCT47 is linear output temperature sensor whose output voltage is directly proportional to measured temperature. The NCT47 can accurately measure temperature from –40°C to +125°C. For the NCT47, the output voltage range is typically 100mV at –40°C, 500mV at 0°C, 750mV at +25°C, and 1.75V at +125°C. A 10mV/°C voltage slope allows for the wide temperature range. The NCT47 is packaged in space saving 3–Pin SOT–23B packages, making them ideal for space critical applications.
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Features Wide Temperature Measurement Range: –40°C to 125°C High Temperature Converter Accuracy: ±2°C Max at 25°C Linear Temperature Slope: 10mV/°C 2.7V to 4.4V Operating Range Small 3–Pin SOT–23B Package Very Low Supply Current: 35µA typical
SOT–23B (TO–236) CASE TBD
PIN CONFIGURATION (Top View)
VDD 1 VSS
Typical Applications • Cellular Phones • Power Supply Thermal Shutdown • Temperature–Controlled Fans • Temperature Measurement / Instrumentation • Temperature Regulators • Consumer Electronic • Portable Battery Powered Equipment
FUNCTIONAL BLOCK DIAGRAM
VDD = 2.7V to 4.4V MICROCONTROLLER VDD NCT47 VOUT
3 VOUT 2
SOT–23B*
NOTE: *SOT–23B is equivalent to JEDEC (TO–236)
ORDERING INFORMATION
Device NCT47SNT1 A/D CONVERTER Package SOT–23B Shipping 3000 Tape/Reel
VSS
© Semiconductor Components Industries, LLC, 2000
1
May, 2000 – Rev. 0
Publication Order Number: NCT47/D
NCT47
ABSOLUTE MAXIMUM RATINGS*
Symbol VDD VSS TA Tstg Tsol Supply Voltage Voltage on Any Pin with Respect to Supplies Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 Seconds) Parameter Value +7.0 (VSS – 0.3) to (VDD + 0.3) –40 to +125 –55 to +150 +260 Unit V V °C °C °C
* Maximum Ratings are those values beyond which damage to the device may occur.
ELECTRICAL CHARACTERISTICS (TA = –40°C to +125°C, VDD = 2.7V to 4.4V, unless otherwise noted.)
Symbol VDD IQ AV TMPACY25 TMPACY125 TMPACY–40 VOUT–40 VOUT+25 VOUT+125 IOUT Supply Voltage Supply Current, Operating Average Slope of Output Voltage Temperature Accuracy at 25°C Temperature Accuracy Temperature Accuracy Output Voltage at –40°C Output Voltage at 25°C Output Voltage at 125°C Output Source and Sink Current TA = 25°C TA = 125°C TA = –40°C Characteristic Min 2.7 — — –2.0 –3.0 — — 730 1720 100 Typ — 35 10 ±0.5 — 1.5 100 750 1750 — Max 4.4 60 — +2.0 +3.0 — — 770 1780 — Unit V µA mV/°C °C °C °C mV mV mV µA
PIN DESCRIPTION
ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Pin No. 1 2 3 Symbol VDD Description Input Supply Voltage VOUT VSS Temperature Sensor Output Terminal Ground Terminal
DETAILED DESCRIPTION
The NCT47 has an output voltage that varies linearly with temperature in degrees Celsius. Figure 1 shows a plot of the output voltage versus temperature for the NCT47. The
temperature slope is fixed at 10 mV/°C, and the output voltage at 0°C is 500 mV.
VOUT = (10 mV/°C) (Temperature °C) + 500 mV 1.75 1.7 1.5 Vout(Volts) 1.3 1.1 0.9 0.7 0.5 0.3 0.1 –40 –30 –20–10 0 10 20 30 40 50 60 70 80 90 100110120 Temperature (°C) 125
Figure 1. Output Voltage vs. Temperature
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2
NCT47
TYPICAL CHARACTERISTICS
4 3 SUPPLY CURRENT ( mA) 2 TEMP ACC. ( C) ° 1 0 –1 –2 –3 –4 –50 –40–30 –20–10 0 10 20 30 40 50 60 70 80 90 100110 120130140 TEMPERATURE (C°) Vdd = 4.4V Vdd = 2.7V 60 50 40 30 20 10 0 –40 Vdd = 2.7V Vdd = 4.4V
–25 –10
5
20
35
50
65
80
95
110 125
TEMPERATURE (C°)
Figure 2. Temperature Accuracy vs Temperature
Figure 3. Supply Current vs Temperature
TAPING FORM
Component Taping Orientation for 3–Pin SOT–23B (JEDEC TO–236) Devices
USER DIRECTION OF FEED
DEVICE MARKING W = Width of Carrier Tape
PIN 1
P = Pitch Standard Reel Component Orientation (Mark Right Side Up)
Tape & Reel Specifications Table Package SOT–23B Carrier Width (W) 8 mm Pitch (P) 4 mm Part Per Full Reel 3000 Reel Size 7 inches
MARKING DIAGRAM
SOT–23B
x
x
Y
W
xx = part number code & temperature range YW = Date Code
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3
NCT47
PACKAGE DIMENSIONS
3–Pin SOT–23B (JEDEC TO–236)
0.021 (0.54) 0.015 (0.37)
0.103 (2.64) 0.083 (2.10)
0.055 (1.40) 0.047 (1.20)
0.040 (0.60) 0.017 (0.44)
0.120 (3.05) 0.105 (2.67) 0.040 (1.02) 0.031 (0.79)
8 ° MAX. 0.080 (2.05) 0.070 (1.78)
0.007 (0.18) 0.003 (0.085) 0.010 (0.25) 0.005 (0.13)
0.004 (0.10) 0.001 (0.02)
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” para.