Datasheet

Maxim Integrated │ 2
www.maximintegrated.com
Evaluates: MAX31865
MAX31865PMB1 Peripheral Module
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.
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.
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.
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 SIGNAL DESCRIPTION
1 SS Chip Select. Assert low to enable the SPI interface.
2 MOSI MAX31865 Serial-Data Input
3 MISO MAX31865 Serial-Data Output
4 SCLK MAX31865 Serial-Clock Input
5, 11 GND Ground
6, 12 V
CC
+3.3V Power Supplies
7 DRDY
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.
8–10 — No Connection