MAX6675ISA+ Maxim Integrated Products, MAX6675ISA+ Datasheet

IC THERMOCOUP TO DGTL 8-SOIC

MAX6675ISA+

Manufacturer Part Number
MAX6675ISA+
Description
IC THERMOCOUP TO DGTL 8-SOIC
Manufacturer
Maxim Integrated Products
Type
Thermocouple Conditionerr
Datasheet
1.MAX6675ISAT.pdf (8 pages)

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
+/- 3 C
Digital Output - Bus Interface
3-Wire, SPI
Digital Output - Number Of Bits
12 bit
Supply Voltage (max)
5.5 V
Supply Voltage (min)
3 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 20 C
Supply Current
1.5 mA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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

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MAX6675ISA+ 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 Direct Digital Conversion of Type -K Thermocouple Output o Cold-Junction Compensation o Simple SPI-Compatible Serial Interface o 12-Bit, 0.25° ...

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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