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PDF MAX31855 Data sheet ( Hoja de datos )
| Número de pieza | MAX31855 | |
| Descripción | Thermocouple-to-Digital Converter | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX31855 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
General Description
The MAX31855 performs cold-junction compensation
and digitizes the signal from a K-, J-, N-, T-, S-, R-, or
E-type thermocouple. The data is output in a signed
14-bit, SPI-compatible, read-only format. This converter
resolves temperatures to 0.25°C, allows readings as
high as +1800°C and as low as -270°C, and exhibits
thermocouple accuracy of ±2°C for temperatures ranging
from -200°C to +700°C for K-type thermocouples. For full
range accuracies and other thermocouple types, see the
Thermal Characteristics specifications.
Applications
●● Industrial
●● Appliances
●● HVAC
Typical Application Circuit
Benefits and Features
●● Integration Reduces Design Time and Lowers
System Cost
• 14-Bit, 0.25°C Resolution Converter
• Integrated Cold-Junction Compensation
• Versions Available for Most Common Thermocouple
Types: K-, J-, N-, T-, S-, R-, and E-Type
• Detects Thermocouple Shorts to GND or VCC
• Detects Open Thermocouple
●● Interfaces to Most Microcontrollers
• Simple SPI-Compatible Interface (Read-Only)
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX31855.related.
VCC
0.1µF
MAX31855
GND
T+
T-
SO
SCK
CS
MICROCONTROLLER
MISO
SCK
SS
19-5793; Rev 5; 1/15
1 page  
MAX31855
Serial-Interface Diagrams
CS
Cold-Junction Compensated
Thermocouple-to-Digital Converter
SCK
SO
D31
Figure 1. Serial-Interface Protocol
D8 D7 D6 D5 D4 D3 D2 D1
D0
CS
SCK
tDV
SO
tCSS
tCH
D31
Figure 2. Serial-Interface Timing
tCL
tDO
tTR
D3 D2 D1 D0
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
Applications Information
Noise Considerations
Because of the small signal levels involved, thermocouple
temperature measurement is susceptible to powersupply
coupled noise. The effects of power-supply noise can be
minimized by placing a 0.1µF ceramic bypass capacitor
close to the VCC pin of the device and to GND.
The input amplifier is a low-noise amplifier designed
to enable high-precision input sensing. Keep the ther-
mocouple and connecting wires away from electrical
noise sources. It is strongly recommended to add a
10nF ceramic surface-mount differential capacitor, placed
across the T+ and T- pins, in order to filter noise on the
thermocouple lines.
Thermal Considerations
Self-heating degrades the device’s temperature measure-
ment accuracy in some applications. The magnitude of
the temperature errors depends on the thermal conduc-
tivity of the device package, the mounting technique, and
the effects of airflow. Use a large ground plane to improve
the device’s temperature measurement accuracy.
The thermocouple system’s accuracy can also be
improved by following these precautions:
• Use the largest wire possible that does not shunt heat
away from the measurement area.
• If a small wire is required, use it only in the region
of the measurement, and use extension wire for the
region with no temperature gradient.
• Avoid mechanical stress and vibration, which could
strain the wires.
• When using long thermocouple wires, use a twisted
pair extension wire.
• Avoid steep temperature gradients.
• Try to use the thermocouple wire well within its tem-
perature rating.
• Use the proper sheathing material in hostile environ-
ments to protect the thermocouple wire.
• Use extension wire only at low temperatures and only
in regions of small gradients.
• Keep an event log and a continuous record of thermo-
couple resistance.
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX31855.PDF ] | |
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