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MAX31855 Evaluation Kit

Evaluates: MAX31855

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

General Description

The MAX31855 evaluation kit (EV kit) provides the

hardware and software (GUI) necessary to evaluate the

MAX31855 cold-junction compensated thermocouple-to-

digital converter.

The MAX31855 EV kit comes with a MAX31855KASA+

soldered to the PCB. This is the K-type thermocouple ver-

sion of the MAX31855. Other thermocouple types can be

evaluated by procuring the desired thermocouple, ther-

mocouple socket, and corresponding MAX31855. Contact

the factory for free samples of the MAX31855 to match

your desired thermocouple type. See the Evaluating Other

Thermocouple Types section for part numbers and addi-

tional information regarding other thermocouple types.

EV Kit Contents

S Assembled Circuit Board Including MAX31855KASA+

S Mini-USB Cable

S K-Type Thermocouple

Features

S Includes Everything Needed to Evaluate a K-Type

Thermocouple

S EV Kit Hardware is USB Powered (USB Cable Included)

S Windows XP

, Windows Vista

, and Windows

Operating Systems-Compatible Software

S USB HID Interface

S Graphical User Interface (GUI) Consists of a

Single .EXE File

S Second Channel Allows Easy Evaluation of Other

Thermocouple Types

S RoHS Compliant

MAX31855 EV Kit Files

Ordering Information appears at end of data sheet.

MAX31855 EV Kit Board

19-6072; Rev 0; 10/11

Note: The .EXE file is downloaded as a .ZIP file.

Windows XP, Windows Vista, and Windows are registered trademarks of Microsoft Corp.

FILE DESCRIPTION

MAX31855EVkit.EXE Application program

Summary of content (12 pages)

PAGE 1
MAX31855 Evaluation Kit Evaluates: MAX31855 General Description The MAX31855 evaluation kit (EV kit) provides the hardware and software (GUI) necessary to evaluate the MAX31855 cold-junction compensated thermocouple-todigital converter. The MAX31855 EV kit comes with a MAX31855KASA+ soldered to the PCB. This is the K-type thermocouple version of the MAX31855. Other thermocouple types can be evaluated by procuring the desired thermocouple, thermocouple socket, and corresponding MAX31855.
PAGE 2
MAX31855 Evaluation Kit Evaluates: MAX31855 Quick Start Note: In the following sections, software-related items are identified by bolding. Text in bold refers to items directly from the EV kit software. Text in bold and underlined refers to items from the Windows operating system.
PAGE 3
MAX31855 Evaluation Kit Evaluates: MAX31855 Figure 1. MAX31855 EV Kit GUI Read from the MAX31855 Section Interfacing to the MAX31855 is simple. The interface is read-only and consists of one 32-bit shift register. When the Single Read button is pressed, all 32 bits are read, parsed, and then displayed. The raw data read from the device is shown in both binary and hexadecimal format in the edit boxes labeled Raw B[31:0].
PAGE 4
MAX31855 Evaluation Kit Evaluates: MAX31855 Detailed Description of Hardware The MAX31855 EV kit hardware provides everything needed to evaluate a K-type thermocouple. In addition to a thermocouple and MAX31855, the hardware includes a USB interface that is used to communicate with the PC-based software. An added feature is that the hardware is USB powered, meaning that no power supplies are needed. Thermocouple Channels The EV kit hardware features two thermocouple channels.
PAGE 5
MAX31855 Evaluation Kit Evaluates: MAX31855 Troubleshooting All effort was made to ensure that each EV kit works on the first try directly out of the box. In the rare occasion that a problem is suspected, see the table below to help troubleshoot the issue. SYMPTOM CHECK SOLUTION Is the LED labeled D1 on? If yes, then the electronic fuse, U7, is in a fault state. Inspect for electrical shorts on the PCB and make sure that the PCB is not sitting on a conductive surface.
PAGE 6
Maxim Integrated 1 1 2 2 GND BLM18PG471 0603 L4 2 BLM18PG471 0603 L2 BLM18PG471 0603 L3 1 2 3 GND BLM18PG471 0603 L1 C7 DNP C4 DNP 1 2 C3 DNP C6 0.01uF C2 0.01uF PCB Layout Notes 1. MAX31855 should be as close as possible to the thermocouple connector. 2. Use as much copper as possible between MAX31855 and connector (PCC-SMP-x-x). 3. Place decoupling CAP close to their voltage supply. 4. Use a large ground plane to improve the device’s temperature measurement accuracy.
PAGE 7
GND GND CS 1M R10 X1 D+ D- C14 DNP BOOTLOAD C15 22pF R5 DNP C16 22pF R11 0 GND R4 4.7K 4 5 R6 3V3 330 C9 0.1uF GND GND 20MHz CRYSTAL_SM 0 R15 0 VBUS ON IN OUT GND FLAG 1 2 3 GND GND GND 3V3 C17 1uF D1 1206 Fault LED GND C10 0.1uF 1uF C11 5VDD GND NOTE: All R, C and L footprints are 0805 unless otherwise stated.
PAGE 8
MAX31855 Evaluation Kit Evaluates: MAX31855 Figure 4. MAX31855 EV Kit PCB Layout—Top Figure 5.
PAGE 9
MAX31855 Evaluation Kit Evaluates: MAX31855 Component List DESIGNATION QTY C1, C5, C9, C10, C19 5 C2, C6, C13 3 DESCRIPTION 0.1FF X7R ceramic capacitors (0805) Venkel C0805X7R160-104KNE 0.
PAGE 10
MAX31855 Evaluation Kit Evaluates: MAX31855 Ordering Information PART TYPE MAX31855EVKIT# EV Kit #Denotes a RoHS-compliant device that may include lead that is exempt under the RoHS requirements.
PAGE 11
MAX31855 Evaluation Kit Evaluates: MAX31855 Revision History REVISION NUMBER REVISION DATE 0 10/11 DESCRIPTION Initial release PAGES CHANGED — Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.
PAGE 12
MAX31855 Evaluation Kit Evaluates: MAX31855 Maxim Integrated 12