MAX6675ISA Maxim Integrated Products, MAX6675ISA Datasheet

IC CONV THERMO TO DIGITAL 8SOIC

MAX6675ISA

Manufacturer Part Number
MAX6675ISA
Description
IC CONV THERMO TO DIGITAL 8SOIC
Manufacturer
Maxim Integrated Products
Type
Thermocouple Conditionerr
Datasheet

Specifications of MAX6675ISA

Input Type
Logic
Output Type
Logic
Interface
SPI
Current - Supply
1.5mA
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Full Temp Accuracy
+/- 6 C
Digital Output - Bus Interface
Serial (SPI)
Digital Output - Number Of Bits
12 bit
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 20 C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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The MAX6675 performs cold-junction compensation
and digitizes the signal from a type-K thermocouple.
The data is output in a 12-bit resolution, SPI™-compati-
ble, read-only format.
This converter resolves temperatures to 0.25°C, allows
readings as high as +1024°C, and exhibits thermocou-
ple accuracy of 8LSBs for temperatures ranging from
0°C to +700°C.
The MAX6675 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.
19-2235; Rev 1; 3/02
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 +1024°C)
Vcc
GND
T+
T-
Applications
MAX6675
SCK
SO
CS
o Direct Digital Conversion of Type -K
o Cold-Junction Compensation
o Simple SPI-Compatible Serial Interface
o 12-Bit, 0.25°C Resolution
o Open Thermocouple Detection
MAX6675ISA
Thermocouple Output
PART
MISO
TOP VIEW
SCK
SSB
MICROCONTROLLER
Typical Application Circuit
68HC11A8
GND
V
T+
CC
T-
-20°C to +85°C
TEMP RANGE
1
2
4
3
Ordering Information
MAX6675
Pin Configuration
SO
6
8
7
5
PIN-PACKAGE
8 SO
N.C.
SO
CS
SCK
Features
1

Related parts for MAX6675ISA

MAX6675ISA Summary of contents

Page 1

... 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 Direct Digital Conversion of Type -K Thermocouple Output o Cold-Junction Compensation o Simple SPI-Compatible Serial Interface o 12-Bit, 0.25°C Resolution o Open Thermocouple Detection PART MAX6675ISA Applications TOP VIEW Vcc MAX6675 GND MISO SO SCK ...

Page 2

Cold-Junction-Compensated K-Thermocouple- to-Digital Converter (0°C to +1024°C) ABSOLUTE MAXIMUM RATINGS Supply Voltage (V to GND) ................................ -0.3V to +6V CC CS, T GND .......................-0. SO, SCK, SO Current ........................................................................ 50mA ESD Protection (Human Body Model) ........................... ...

Page 3

Cold-Junction-Compensated K-Thermocouple- to-Digital Converter (0°C to +1024°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 V Output Low ...

Page 4

Cold-Junction-Compensated K-Thermocouple- to-Digital Converter (0°C to +1024°C) Pin Description PIN NAME FUNCTION 1 GND Ground Alumel Lead of Type-K Thermocouple Should be connected to ground externally Lead of Typ e- K Ther ...

Page 5

Cold-Junction-Compensated K-Thermocouple- to-Digital Converter (0°C to +1024°C) Applications Information The Typical Application Circuit shows the MAX6675 interfaced with a microcontroller. In this example, the MAX6675 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 +1024°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 Bit 15 ...

Page 7

Cold-Junction-Compensated K-Thermocouple- to-Digital Converter (0°C to +1024° 300kΩ 30kΩ 30kΩ 300kΩ _______________________________________________________________________________________ 0.1µF COLD-JUNCTION COMPENSATION DIODE 1MΩ A1 20pF MAX6675 REFERENCE VOLTAGE 1 GND Block Diagram DIGITAL CONTROLLER S5 ADC ...

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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