MAX31865PMB1 Peripheral Module
Evaluates: MAX31865
General Description
The MAX31865PMB1 peripheral module (Pmod™) pro-
vides the necessary hardware to interface the MAX31865
RTD-to-digital converter to any system that utilizes Pmod-
compatible expansion ports configurable for SPI com-
munication. The IC is an easy-to-use resistance-to-digital
converter optimized for platinum resistance temperature
detectors (RTDs). This module is set up to operate with a
PT100 platinum RTD.
For full range accuracies, other RTD types, and detailed
information regarding operation of the IC, refer to the
MAX31865 IC data sheet.
Features and Benefits
●
Simple Conversion of Platinum RTD Resistance to
Digital Value
● Handles 100Ω to 1kΩ (at 0°C) Platinum RTDs
(PT100 to PT1000)
●
Compatible with 2-, 3-, and 4-Wire Sensor
Connections
●
6-Pin Pmod-Compatible Connector (SPI)
●
RoHS Compliant
●
Proven PCB Layout
●
Fully Assembled and Tested
Ordering Information
appears at end of data sheet.
Peripheral Module Board Photo
Pmod is a trademark of Digilent Inc.
19-6909; Rev 0; 1/14
MAX31865PMB1 Peripheral Module
Evaluates: MAX31865
Detailed Description
SPI Interface
The MAX31865PMB1 Pmod can plug directly into a
Pmod-compatible port (configured for SPI) through
connector J1. For information on the SPI protocol, refer to
the MAX31865 IC data sheet.
J1 provides connection of the module to the Pmod host.
The pin functions and pin assignments adhere to the
Pmod standard recommended by Digilent. See
Table 1
for
detailed descriptions.
J2
Two jumpers at J2 are provided to select either 2-wire
or 3-wire RTD configuration. For 2-wire RTD, install both
jumpers, from 1-2 and 3-4. For 3-wire RTD, install jumper
from 3-4 only.
Power Supplies
The Pmod is powered directly by the +3.3V power supply
from the MAXUSB2PMB Munich board, pins 6 and 12 of
connector J1.
CON1
Connector CON1 provides connection to the IC pins, as
follows:
●
Connector CON1 pin 1 connects to FORCE+ and
FORCE2 (pins 5 and 6) of the IC.
●
Connector CON1 pin 2 connects to RTDIN+ (pin 7)
of the IC.
●
Connector CON1 pin 3 connects to RTDIN- (pin 8) of
the IC.
●
Connector CON1 pin 4 connects to FORCE- (pin 9)
of the IC.
Software Graphical User
Interface (GUI)
The Munich GUI is provided to facilitate the evaluation of
the Pmod.
Visit
www.maximintegrated.com/evkitsoftware
to
download the latest version of the Munich GUI software,
PMOD_SPI.ZIP. Refer to the MAX318650PMB1 periph-
eral module and Munich (USB2PMB1) adapter board
Quick Start Guide
for step-by-step evaluation using the
Munich GUI.
Table 1. Connector J1 (SPI Communication)
PIN
1
2
3
4
5, 11
6, 12
7
8–10
SIGNAL
SS
MOSI
MISO
SCLK
GND
V
CC
DRDY
—
MAX31865 Serial-Data Input
MAX31865 Serial-Data Output
MAX31865 Serial-Clock Input
Ground
+3.3V Power Supplies
Active-Low Push-Pull Data-Ready Output.
DRDY
goes low when a new conversion result is
available in the data register. When a read-operation of an RTD resistance data register occurs,
DRDY
returns high.
No Connection
DESCRIPTION
Chip Select. Assert low to enable the SPI interface.
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MAX31865PMB1 Peripheral Module
Evaluates: MAX31865
Component List
DESIGNATION
C1
QTY
1
DESCRIPTION
1µF ±10%, 25V X7R
ceramic capacitor (0603)
TDK C1608X7R1E105K080AB
0.1µF ±10%, 25V XR7
ceramic capacitors (0603)
TDK C1608X7R1E104K080AA
4-position screw terminal,
2.54mm pitch
Phoenix Contact 1725672
12-pin connector header,
.100 R/A 15AU
FC1 68021-212HLF
4-pin header
Molex 0757570441
DESIGNATION
R1
R2–R6
R7
R8
R9
QTY
1
5
1
0
0
DESCRIPTION
4.7kΩ ±5% resistor (0603)
150Ω ±5% resistors (0603)
400Ω ±0.1% resistor (0603)
Not installed, 400Ω ±0.1%
resistor (0805)
Not installed, 400Ω ±0.1%
resistor (1206)
RTD-to-digital converter
(20 TQFN-EP*)
Maxim MAX31865ATP+
100Ω platinum-chip temperature
sensor, leaded
Reichelt Elektronik PCA1.1505 1
or equivalent
C2–C4
3
CON1
1
U1
1
J1
J2
1
1
—
1
*EP = Exposed pad.
Component Suppliers
SUPPLIER
Molex
Phoenix Contact
Reichelt Elektronik
TDK Corp.
PHONE
800-786-6539
717-944-1300
49 (0) 4422-955-333
847-803-6100
WEBSITE
www.molex.com
www.phoenixcontact.com
www.reichelt.com
www.component.tdk.com
Note:
Indicate that you are using the MAX31865PMB1 when contacting these component suppliers.
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Maxim Integrated
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MAX31865PMB1 Peripheral Module
Evaluates: MAX31865
Figure 1. MAX31865PMB1 Peripheral Module Schematic
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Maxim Integrated
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MAX31865PMB1 Peripheral Module
Evaluates: MAX31865
Figure 2. MAX31865PMB1 Peripheral Module Component Placement Guide—Top
Figure 3. MAX31865PMB1 Peripheral Module Component Placement Guide—Bottom
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