MAX31850/MAX31851 Evaluation Kit
Evaluates:
MAX31850/MAX31851
General Description
The MAX31850/MAX31851 evaluation kit (EV kit) pro-
vides the hardware and software graphical user interface
(GUI) necessary to evaluate the MAX31850/MAX31851
cold-junction compensated, 1-Wire
®
thermocouple-to-
digital converter.
The EV kit comes with a MAX31850KATB+ soldered to
the PCB. This is the K-type thermocouple version of the
device. Other thermocouple types can be evaluated by
procuring the desired thermocouple, thermocouple sock-
et, and corresponding MAX31850 or MAX31851. Contact
the factory for free samples of the devices to match your
desired thermocouple type. See the
Evaluating Other
Thermocouple Types
section for part numbers and addi-
tional information regarding other thermocouple types.
Features
● Includes Everything Needed to Evaluate a
MAX31850K with a K-Type Thermocouple
● EV Kit Hardware is USB Powered (USB Cable
Included)
● Windows XP
®
- and Windows
®
7-Compatible
Operating System Software
● USB HID Interface
● Second Channel Allows Easy Evaluation of Other
Thermocouple Types
● Fully Assembled and Tested on Proven PCB Layout
● RoHS Compliant
EV Kit Contents
● Micro-USB Cable
MA31850/MAX31851 EV Kit Files
FILE
MAX31850_51EVKitSetup.EXE
DESCRIPTION
Application Program
Note:
The .EXE is downloaded as a .ZIP file.
Ordering Information
appears at end of data sheet.
● Assembled Circuit Board Including MAX31850K
● K-Type Thermocouple
MAX31850/MAX31851 EV Kit Board
1-Wire is a registered trademark of Maxim Integrated
Products, Inc.
Windows and Windows XP are registered trademarks and
registered service marks of Microsoft Corporation.
19-6752; Rev 0; 7/13
MAX31850/MAX31851 Evaluation Kit
Evaluates:
MAX31850/MAX31851
Component List
DESIGNATION QTY
C1, C5, C203,
C214
C2, C3, C6,
C7, C215
C4, C8, C212
C201, C202,
C204
C211
C213
D20, D21
D22
J20
J21
JP1–JP12
L1–L4
M200
R201, R202,
R214, R218
R203, R205
R204
R206
R207
R210, R217
R211, R212
R213
4
0
3
3
1
1
2
1
1
0
12
4
1
4
1
1
1
1
2
2
1
DESCRIPTION
0.01µF ceramic capacitors (0805)
Do not populate, ceramic capacitors
(0805)
0.1µF ceramic capacitors (0805)
10µF ceramic capacitors (0805)
1.0µF ceramic capacitor (0805)
0.22µF ceramic capacitor (0805)
Red/green dual LEDs
Schottky diode
5-pin female Micro-USB connector
Do not populate, 2-pin header
3-pin (1 x 3) headers, 2.54mm pitch
470Ω ferrite beads (0603)
BLM18PG471SN1D
30V, 1.2A pMOS (3 SC70)
0Ω ±1% resistors (0805)
560Ω ±1% resistors (0805)
100kΩ ±1% resistor (0805)
45.3kΩ ±1% resistor (0805)
10kΩ ±1% resistor (0805)
4.7kΩ ±1% resistors (0805)
330Ω ±1% resistors (0805)
2.2kΩ ±1% resistor (0805)
U22
X1
—
—
—
—
*EP
= Exposed pad.
DESIGNATION QTY
TH1
TH2
TP1
TP2, TP3
TP6
U1
U3
U2, U4
U20
U21
1
0
1
2
1
1
0
2
1
1
1
1
1
1
12
1
DESCRIPTION
K-type thermocouple socket
Omega PCC-SMP-K-5-ROHS
Do not populate, thermocouple socket
White test point
Black test points
Red test point
Thermocouple-to-digital converter
(10 TDFN-EP*)
Maxim MAX31850KATB+
Do not populate, MAX31850/
MAX31851
TVS diode arrays (3 SOT)
NUP2105LT1G
Microcontroller (28 SO)
Microchip PIC18LF2550-I/SO
50mA to 600mA current-limit switch
(6 SOT23)
Maxim MAX4995AAUT+
500mA LDO regulator
Maxim MAX8902BATA+
48MHz, 3.3V oscillator (SMD)
AVX KC3225A48.0000C30E00
Micro-USB cable
K-type thermocouple
Omega 5SRTC-GG-K-24-36-ROHS
Jumpers/shunts
PCB: MAX31850/51 EV Kit
Component Suppliers
SUPPLIER
AVX North America
Omega Engineering, Inc
PHONE
864-967-2150
888-826-6342
WEBSITE
www.avx.com
www.omega.com
Note:
Indicate that you are using the MAX31850/MAX31851 when contacting these component suppliers.
www.maximintegrated.com
Maxim Integrated │ 2
MAX31850/MAX31851 Evaluation Kit
Evaluates:
MAX31850/MAX31851
6)
Once the device driver installation is complete,
visit
www.maximintegrated.com/evkitsoftware
to
download the latest version of the EV kit software,
titled MAX31850_51EVKitSetup.ZIP. Save the EV kit
software to a temporary folder.
Unzip the .ZIP file and double click the .EXE file to run
the installer. A message box stating
The publisher
could not be verified. Are you sure you want to
run this software?
may appear. If so, click
Yes.
Follow the instructions on the installer and once com-
plete, click
Finish.
The default location of the GUI is
in the program files directory.
When the GUI appears, the status bar should display
EV kit hardware Connected
in the bottom right
hand corner. The com LED (D21) on the EV kit board
should turn green.
Quick Start
Required Equipment
● MAX31850/MAX31851 EV kit hardware
● Windows XP or Windows 7 PC with a spare USB
port
● USB Port
● Micro-USB cable (included)
● K-type thermocouple (included)
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.
7)
8)
9)
Procedure
Follow the steps below to get started measuring
temperature using the device interfaced to a K-type
thermocouple.
1)
Connect the included K-type thermocouple to TH1
(thermocouple socket) of the EV kit hardware. One
terminal of the thermocouple is wider than the other,
ensuring proper polarity.
Ensure that jumpers/shunts are installed on JP1–
JP6. JP1 and JP2 should both be either positioned
on the left for parasitic power mode or positioned on
the right to be externally powered. JP3–JP6 jumpers
can be in either position depending on the desired
location address.
Set the EV kit hardware on a nonconductive surface
to ensure that nothing on the PCB gets shorted
together.
Prior to starting the GUI, connect the EV kit hard-
ware to a PC using the supplied Micro-USB cable,
or equivalent. The power LED (D20) should be green
and the com LED (D21) should be red and slowly
flash orange.
Windows should automatically begin installing the
necessary device driver. The USB interface of the
EV kit hardware is configured as an HID device and
therefore does not require a unique/custom device
driver. Once the driver installation is complete, a
Windows message appears near the
System Icon
menu indicating that the hardware is ready to use.
Do not attempt to run the GUI prior to this message.
If you do, you must close the application and restart
it once the driver installation is complete. On some
versions of Windows, Administrator privileges may be
required to install the USB device.
Detailed Description of Software
Software Startup
If the MAX31850/MAX31851 EV kit is connected when
the software is opened, the software first initializes the
hardware to communicate. Then the software searches
for all ROM codes on the bus and lists them in the
ROM
Code
drop-down lists. If a ROM code is found with the
correct family code (3Bh), the software reads all data from
the device. If the software is started without the hardware
connected, the initialization sequence above is executed
once the EV kit is connected.
When the
Read Data
tab sheet (Figure
1)
is selected, a
temperature conversion is performed and the scratchpad
and power-supply mode are read from the device. The
Read Power Mode
button executes the Match ROM
(55h) and Read Power Supply (B4h) command and
displays the data in the
Power Supply Mode
edit field.
The
Read Temperature
button executes the Match ROM
(55h), Convert T (44h), and Read Scratchpad (BEh)
commands. This reads the
Thermocouple Temp, Cold
Junction Temp, Fault Status,
and
Location Address,
and then the
Linearized Temp
is calculated. If the
Power Supply Mode
is parasite, then a strong pullup
is enabled while the device converts temperature. If a
fault is detected, then the color indicator turns red and
the status bar displays
FAULT!.
Both buttons match the
ROM code selected in the
ROM Code
drop-down list. The
Thermocouple Type
drop-down list is used to calculate
the linearized temperature and should be changed to
match the hardware thermocouple type.
Table 1
lists all
2)
3)
Read Data Tab
4)
5)
www.maximintegrated.com
Maxim Integrated │ 3
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