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Evaluates: MAX31827

MAX31827 Evaluation System

Detailed Description of Software

The main window of the MAX31827 EV kit software con-

tains controls to evaluate the MAX31827 IC.

Configuration Register

The

Configuration Register groupbox allows the user to

select the resolution, conversion rate, alarm polarity, and

fault queue. Use the

Resolution drop-down list to select

between 8-, 9-, 10-, and 12-bits resolution. With each

resolution, the user can set the desired sampling rate

using the options in the

Conversion drop-down list. The

alarm polarity can be adjusted between high-active and

low-active. In addition, users can set the fault queue from

1, 2, 4, or 8 consecutive faults.

High and Low Fault

Adjust the

TH (Temperature High) and TL (Temperature

Low) edit boxes to the desired temperature threshold.

When the desired setting is set, click the

Write Registers

button to apply. When the ALARM output asserts in com-

parator mode, the

Over Temp or Under Temp indica-

tor displays red until the temperature returns within the

threshold range.

When the ALARM output asserts in interrupt mode, the

Over Temp or Under Temp indicator displays red until the

read is performed on configuration register.

The ALARM also appears at the ALARM pin of the IC. To

check if the signal is high or low, use the

Check button

for the alarm status.

Address

The address is determined by the resistor/connection on

RSEL pins of the MAX31827.

Detect Address loads bits

to status register. Refer to the IC data sheet for the list of

addresses. Addresses are displayed on the

A5-A0 drop-

down list. Once the desired address is selected, click the

Set Address button to apply.

Temperature

The temperature is displayed in the graph, hexadecimal

code, and converted temperature by clicking on the

Start

Sampling Continuously or Read Once button.

Logging Data

The temperature and raw code can be saved to a file.

Click the

Export to *.CSV button before collecting data.

Detailed Description of Hardware

The MAX31827 EV system demonstrates the MAX31827,

I2C temperature sensor with address and alarm. The

USB2PMB2 module and the EV kit complete the system.

connector J1 is a PMod™-compatible connector. If the

master does not have a PMod-compatible connector, then

make connection directly to the SCL and SDA test points.

Make sure the return ground is same. See Table 1 for

jumper user-supplied VCC.

The MAX31827 is powered through USB by default when

a PMod-compatible master module is connected to the

J1 connector of the EV kit. If the user-supplied VCC is

used, a PMod master module is not allowed on the J1

connector. In this case, apply a voltage between +1.6V

and +3.6V at the VCC test point and ground is connected

at the GND test point.

User-Supplied VPU

The J2 jumper allows the user to apply their own pullup

voltage. When a shunt is on the 1-2 position, apply a volt-

age between +1.6V and +3.6V at the VPU test point and

verify the return path is connected at the GND test point.

#Denotes RoHS compliance.

Pmod is a trademark of Digilent Inc.

Ordering Information

PART

TYPE

MAX31827EVSYS1#

EV system (EV kit + Master Board)

MAX31827EVKIT#

EV kit

USB2PMB2#

Master Board