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MAX6674ISA+

P1-P3P4-P6P7-P8
General Description
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.
Applications
Industrial
Appliances
HVAC
Automotive
Features
♦ Cold-Junction Compensation
♦ Simple SPI-Compatible Serial Interface
♦ 10 Bit, 0.125°C
♦ Open Thermocouple Detection
MAX6674
Cold-Junction-Compensated K-Thermocouple-
to-Digital Converter (0°C to +128°C)
________________________________________________________________ Maxim Integrated Products 1
CS
SCKV
CC
1
2
8
7
N.C.
SOT-
T+
GND
SO
TOP VIEW
3
4
6
5
MAX6674
Pin Configuration
Vcc
GND
T+
T-
SO
SCK
CS
MICROCONTROLLER
68HC11A8
MISO
SCK
SSB
0.1µF
MAX6674
Typical Application Circuit
19-2241; Rev 1; 8/02
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.
Ordering Information
SPI is a trademark of Motorola, Inc.
PART TEMP RANGE PIN-PACKAGE
MAX6674ISA -20°C to +85°C 8 SO
MAX6674
Cold-Junction-Compensated K-Thermocouple-
to-Digital Converter (0°C to +128°C)
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +5.5V, T
A
= -20°C to +85°C, unless otherwise noted. Typical values specified at +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (V
CC
to GND) ................................. -0.3V to +6V
SO, SCK, CS, T-, T+ to GND .......................-0.3V to V
CC
+ 0.3V
SO Current .........................................................................50mA
ESD Protection (Human Body Model) ........................... ±2000V
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
Operating Temperature Range ...........................-20°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
SO Package
Vapor Phase (60s) ......................................................+215°C
Infrared (15s) ..............................................................+220°C
Lead Temperature (soldering, 10s) ................................ +300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
CC
= +3.3V -1 +1
T
THERMOCOUPLE
=
+100°C, T
A
= +25°C
(Note 2)
V
CC
= +5V -1.5 +1.5
V
CC
= +3.3V -2 +2
Temperature Error
T
THERMOCOUPLE
=
0°C to +125°C, T
A
=
+25°C (Note 2)
V
CC
= +5V -3 +3
°C
Temperature Conversion
Constant
5.125 µv/LSB
T
A
= +25°CV
CC
= +3.3V -1 +1
Cold-Junction Compensation
T
A
= -20°C to +85°C
(Note 2)
V
CC
= +3.3V and +5V -3 +3
°C
Resolution 0.125 °C
Thermocouple Input Impedance 20 kΩ
Supply Voltage V
CC
3.0 5.5 V
Supply Current I
CC
12mA
Power-On Reset Threshold V
CC
rising 1 2 2.5 V
Power-On Reset Hysteresis 50 mV
Conversion Time (Note 2) 0.15 0.18 s
SERIAL INTERFACE
Input Low Voltage V
IL
0.3 x
V
CC
V
Input High Voltage V
IH
0.7 x
V
CC
V
Input Leakage Current I
LEAK
V
IN
= GND or V
CC
-5 5 µA
Input Capacitance C
IN
5pF
MAX6674
Cold-Junction-Compensated K-Thermocouple-
to-Digital Converter (0°C to +128°C)
_______________________________________________________________________________________ 3
2
1
0
-1
-2
04515 30 60 75 90
OUTPUT CODE ERROR
vs. TEMPERATURE
MAX6674 toc01
TEMPERATURE (°C)
OUTPUT CODE ERROR (°C)
-2
0
-1
1
2
-1200 12000 2400 3600 4800
OUTPUT CODE ERROR
vs. VOLTAGE DIFFERENTIAL
MAX6674 toc02
VOLTAGE DIFFERENTIAL (µV)
OUTPUT CODE ERROR (°C)
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +5.5V, T
A
= -20°C to +85°C, unless otherwise noted. Typical values specified at +25°C.) (Note 1)
Note 1: All specifications are 100% tested at T
A
= +25°C. Specification limits over temperature (T
A
= -20°C to +85°C) are guaran-
teed by design and characterization, not production tested.
Note 2: Guaranteed by design. Not production tested.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output High Voltage V
OH
I
SOURCE
= 1.6mA
V
CC
-
0.4
V
Output Low Voltage V
OL
I
SINK
= 1.6mA 0.4 V
TIMING
Serial Clock Frequency f
SCL
4.3 MHz
SCK Pulse High Width t
CH
100 ns
SCK Pulse Low Width t
CL
100 ns
CSB Fall to SCK Rise t
CSS
C
L
= 10pF 100 ns
CSB Fall to Output Enable t
DV
C
L
= 10pF 100 ns
CSB Rise to Output Disable t
TR
C
L
= 10pF 100 ns
SCK Fall to Output Data Valid t
DO
C
L
= 10pF 100 ns
P1-P3P4-P6P7-P8

MAX6674ISA+

Mfr. #:
Buy MAX6674ISA+
Manufacturer:
Maxim Integrated
Description:
Sensor Interface K Thermocouple to Digital Converter
Lifecycle:
New from this manufacturer.
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