MAX31865EVKIT# Maxim Integrated, MAX31865EVKIT# Datasheet - Page 7

• Manufacturer Part Number: MAX31865EVKIT#
• Description: Data Conversion IC Development Tools MAX31865 Eval Kit
• Manufacturer: Maxim Integrated
• Type: RTD to Digitalr

Specifications of MAX31865EVKIT#

• Rohs: yes
• Product: Evaluation Kits
• Tool Is For Evaluation Of: MAX31865
• Interface Type: SPI, USB
• Operating Supply Voltage: 3.3 V
• Part # Aliases: 90-31865#K00

MAX31865 Evaluation Kit
Detailed Description of Hardware
User­Supplied SPI Interface
The USB-to-SPI master section of the EV kit is not nec-
essary for the proper operation of the device. If the user
wants to supply the SPI interface, the USB-to-SPI master
section of the EV kit can be disconnected by removing
resistors R7–R10. Connect test points SDO, CS, SCLK,
SDI, and GND. The DRDY output signal from the device
can also be routed to a different master by removing
resistor R6 and connecting to the DRDY and GND test
points.
User­Supplied Power Supply
To disconnect the device from the USB-powered supply
and apply an outside power source, remove resistor R5
and connect to the 3.3V and GND test points.
User­Supplied RTD
The EV kit comes with a 1kΩ resistor and two jumper
wires installed to the CON4 terminal block. This is
to allow for an out-of-the-box functioning system, but
does not provide real-world temperatures. To evaluate
Table 1. Hardware Configurations
Table 2. Description of LEDs
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D20 (POWER)
Connect User-Supplied Power
D21 (COM)
Connect User-Supplied RTD
Connect DRDY Pin to User-
Connect User-Supplied SPI
Connect User-Supplied
HARDWARE ACTION
LED
D1
Reference Resistor
Supplied Input
Interface
Supply
Flashing Orange
Red and
COLOR
Green
Red
Red
Red
Off
COMPONENTS
DRDY: LED connected to the active-low/DRDY data-ready output. The LED is red when a
new conversion result is available in the RTD Data registers.
USB Power Fault: A fault occurred due to overvoltage limit, current limit, or thermal limit.
USB Power: USB power supply is on.
Communication: After the software has initialized the hardware, the LED flashes red when
a command from the PC is received.
Initialized: Hardware has been initialized by software.
Waiting: Hardware is powered on and waiting for the software to be opened.
R7–R10
CON4
R3
R6
R5
Remove factory-installed reference resistor R3 and populate R1–R3 with
user-supplied reference.
Remove factory-installed resistor and jumpers from the terminal block
CON4 and insert user-supplied RTD.
Remove resistor R6 and connect to the DRDY test point.
Remove resistor R5 and connect the user supply to the 3.3V and GND test
points.
Remove resistors R7–R10 and connect the user SPI interface to test
points.
temperature, an RTD must be connected. Connect a
PT1000 RTD to make the RTD temperature Simple
Linearizing equation and the RTD temperature
Calendar­Van Duesen Equation in the RTD Resistance
Register group box valid. To connect a user-supplied
RTD, loosen the terminal block with a screwdriver and
remove the preinstalled resistor and jumper wires. Insert
the RTD and tighten the terminals. Note that for a 2-wire
RTD, the two jumper wires also need to be inserted in
accordance with the 2-wire RTD Sensor Connector dia-
gram on the PCB’s silkscreen. Also, for a 3-wire RTD, one
jumper wire needs to be inserted in accordance with the
3-wire RTD Sensor Connector diagram on the PCB’s silk-
screen. The 4-wire RTD does not need any jumper wires.
User­Supplied Reference Resistor
The EV kit comes equipped with a 4kΩ, 10ppm/°C
temperature coefficient, ±0.1% tolerance reference
resistor. User-supplied reference resistors can also be
used by removing R3 and populating one of the following:
R1 (0805 footprint), R2 (1206 footprint), or R3 (0.3in axial
footprint). Properly clean the PCB after any soldering
rework.
DESCRIPTION
DESCRIPTION
Evaluates: MAX31865
Maxim Integrated │ 7