MAX6674ISA+ Maxim Integrated Products, MAX6674ISA+ Datasheet

IC THERMOCOUP TO DGTL 8-SOIC

MAX6674ISA+

Manufacturer Part Number
MAX6674ISA+
Description
IC THERMOCOUP TO DGTL 8-SOIC
Manufacturer
Maxim Integrated Products
Type
Temperature Sensorr
Datasheet
1.MAX6674ISA.pdf (8 pages)

Specifications of MAX6674ISA+

Input Type
Logic
Output Type
Logic
Interface
3-Wire SPI Serial
Current - Supply
2mA
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Full Temp Accuracy
+/- 2 C
Digital Output - Bus Interface
3-Wire, SPI
Digital Output - Number Of Bits
10 bit
Supply Voltage (max)
5.5 V
Supply Voltage (min)
3 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 20 C
Supply Current
2 mA
Sensing Accuracy Range
± 2°C
Supply Voltage Range
3V To 5.5V
Resolution (bits)
10bit
Sensor Case Style
SOIC
No. Of Pins
8
Operating Temperature Range
-20°C To +85°C
Rohs Compliant
Yes
Data Interface
2-Wire, I2C, Serial
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX6674 cold-junction-compensation thermocou-
ple-to-digital converter performs cold-junction compen-
sation and digitizes the signal from a type-K
thermocouple. The data is output in a 10-bit resolution,
SPI™-compatible, read-only format.
This converter resolves temperatures to 0.125°C, allows
readings as high as +128°C, and exhibits thermocouple
accuracy of ±2°C for temperatures ranging from 0°C to
+125°C.
The MAX6674 is available in a small, 8-pin SO package.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
19-2241; Rev 1; 8/02
SPI is a trademark of Motorola, Inc.
Cold-Junction-Compensated K-Thermocouple-
Industrial
Appliances
HVAC
Automotive
________________________________________________________________ Maxim Integrated Products
General Description
0.1µF
to-Digital Converter (0°C to +128°C)
Applications
Vcc
GND
T+
T-
MAX6674
SCK
SO
CS
o Cold-Junction Compensation
o Simple SPI-Compatible Serial Interface
o 10 Bit, 0.125°C
o Open Thermocouple Detection
MAX6674ISA
TOP VIEW
PART
MISO
SCK
SSB
Typical Application Circuit
MICROCONTROLLER
GND
V
T+
CC
T-
68HC11A8
1
2
4
3
-20°C to +85°C
TEMP RANGE
Ordering Information
MAX6674
SO
Pin Configuration
6
8
7
5
N.C.
SO
CS
SCK
PIN-PACKAGE
8 SO
Features
1

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MAX6674ISA+ Summary of contents

Page 1

... Industrial Appliances HVAC Automotive SPI is a trademark of Motorola, Inc. 0.1µF ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. o Cold-Junction Compensation o Simple SPI-Compatible Serial Interface o 10 Bit, 0.125°C ...

Page 2

Cold-Junction-Compensated K-Thermocouple- to-Digital Converter (0°C to +128°C) ABSOLUTE MAXIMUM RATINGS Supply Voltage (V to GND) ................................. -0.3V to +6V CC SO, SCK, CS, T GND .......................-0. Current .........................................................................50mA ESD Protection (Human Body Model) ........................... ±2000V ...

Page 3

Cold-Junction-Compensated K-Thermocouple- to-Digital Converter (0°C to +128°C) ELECTRICAL CHARACTERISTICS (continued +3.0V to +5.5V -20°C to +85°C, unless otherwise noted. Typical values specified at +25°C.) (Note PARAMETER SYMBOL Output High Voltage Output Low Voltage ...

Page 4

Cold-Junction-Compensated K-Thermocouple- to-Digital Converter (0°C to +128°C) Pin Description PIN NAME FUNCTION 1 GND Ground Alumel Lead of Type-K Thermocouple Should be connected to ground externally Chromel Lead of Type-K Thermocouple Positive Supply. Bypass with a ...

Page 5

Cold-Junction-Compensated K-Thermocouple- to-Digital Converter (0°C to +128°C) Applications Information The Typical Application Circuit shows the MAX6674 interfaced with a microcontroller. In this example, the MAX6674 processes the reading from the thermocou- ple and transmits the data through a serial interface. ...

Page 6

Cold-Junction-Compensated K-Thermocouple- to-Digital Converter (0°C to +128°C) CS SCK SO D15 D14 D13 D12 Figure 1a. Serial Interface Protocol t CSS SCK D15 Figure 1b. Serial Interface Timing DUMMY BIT SIGN BIT TEMPERATURE READING ...

Page 7

Cold-Junction-Compensated K-Thermocouple- to-Digital Converter (0°C to +128° 300kΩ 10kΩ 10kΩ 300kΩ _______________________________________________________________________________________ 0.1µF COLD-JUNCTION COMPENSATION DIODE 1MΩ A2 20pF MAX6674 REFERENCE VOLTAGE 1 GND TRANSISTOR COUNT: 6460 PROCESS: BiCMOS ...

Page 8

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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