ANALOG DEVICES MAX31732EVKIT Four Channel Temperature Sensor User Guide

ANALOG DEVICES MAX31732EVKIT Four-Channel Temperature Sensor

Specifications

• Product Name: MAX31732 Evaluation Kit (EV Kit)
• Description: Multi-channel temperature sensor for monitoring local and remote diode-connected transistors
• Power Source: USB-powered
• Interface: USB-to-SMBus/I2C
• Components: MAX31732 sensor, quad external diode-connected transistors, MAX32625 PICO board

Product Usage Instructions

Quick Start

1. Ensure the EV kit hardware is placed on a nonconductive surface.
2. Connect the USB side of the cable to the PC and the Micro-USB side to the EV kit Pico board U2. The power LED (D2) on U2 should be flashing green.
3. Download and install the MAX31732GUI.exe software from the provided link.
4. Launch the Analog Devices MAX31732 GUI software and connect to the COM port.

Setup and Operation

1. Upon successful connection, ensure “Connected” is displayed at the bottom right corner of the GUI screen.
2. Check that all green indicators under the Status tab in the GUI are green, indicating proper functionality.
3. Monitor the LEDs on both sides for temperature and diode fault indications.

FAQ

Q: What should I do if the COM port is not found by the GUI? A: Check the cable connection between the computer and the EV kit Pico board. Ensure proper connection and try reconnecting.

Q: How do I troubleshoot a red diode fault indicator? A: If a diode fault indicator is red, that channel will be skipped, and the corresponding diode temperature will not be updated. Check the connections and diode functionality for that channel.

General Description

• The MAX31732 Evaluation kit (EV kit) provides the hardware and software graphical user interface (GUI) necessary to evaluate the MAX31732, a multi-channel temperature sensor that monitors its local temperature and the temperatures of four remote diode-connected transistors.
• The MAX31732 is specified over the -40°C to +125°C operating temperature range and powered up with a 3.3V supply provided by the Micro-USB Type-B cable. It is available in a 4mm x 4mm 24-TQFN package.
• The EV kit includes an installed MAX31732, quad external diode-connected transistors, and an MAX32625 PICO board (already installed in U2) to use as a USB-to-SMBus/I2C interface.
• It connects to the PC through a MAX32625 PICO board and a Micro-USB Type-B cable.
• The EV kit is versatile, easy to use, and USB-powered. The Printed Circuit Board (PCB) layout has been carefully designed, assembled, and tested.
• A Windows® 7 or higher operating system is required to use the GUI.
• Design files for this circuit board are available.
• Ordering Information appears at the end of the datasheet.

Quick Start

Required Equipment

• MAX31732EVKIT# Hardware
• Windows 7 or higher
• Micro-USB Type-B cable is included

Required Software GUI

• MAX31732GUI.exe

Procedure

• In the following sections, software-related items are identified by bolding. Text in Bold refers to items directly from the EV kit software.

Follow the steps below to verify the board:

1. Ensure that all jumpers/shunts (J1–J10) are installed according to the EV kit Board Connections. See Figure 1.
2. Set the EV kit hardware on a nonconductive surface to ensure that nothing on the PCB gets shorted together.
3. Before starting the GUI, connect the USB side of the cable to the PC and the Micro-USB side to the EV kit Pico board U2. The power LED (D2) on U2 (PICO board MAX32625) should be slowly flashing green.
4. Visit: https://www.analog.com/en/products/max31732.html (Under the Tools & Simulation tab, download the latest version of the MAX31732GUI.exe software. Save the software to a temporary folder and unpack the zip file.) Install the EV kit software on the computer by running the MAX31732GUI.exe program inside the temporary folder.
5. Once the GUI installation is complete, find Analog Devices → MAX31732 GUI in your Windows start menu and run it. The GUI will display a splash screen.
   • Then, a Windows dialog box should appear on your screen, showing a COM port found by the GUI. Click Connect. If the COM port does not appear, check your cable connection between the computer and the EV kit Pico board.
6. After these steps, the GUI must launch on your computer.

Table 1. Jumpers Default Connections

Setup and Operation

• Once the connection has been successful, the user should see Connected at the bottom right corner of the GUI screen.
• Ensure none of the green indicators under the Status tab in the GUI are red. They all must be green, as shown in Figure 2. The LEDs on the left side show a channel over temperature or under temperature conditions, or a diode fault.
• The LEDs on the right side show what kind of a diode fault is detected. If a diode fault indicator is red, then that channel will be skipped, and the diode temperature corresponding to that channel will not be updated.

Menu and Status Bar

• Under the “File” menu the user can simply Exit.
• Under the “Option,” the user can choose the Polling Rate either in Auto or “100ms-1000ms.” If the user needs to record temperatures into a file, click Log Polling Data to File and then click Start Polling (under the status tab).
• The data can be saved as a . CSV format file.
• Under the “Device” menu, the user can choose the preferred I2C clock frequency, as well as additional choices like Target Device Address and Reset Devices is equivalent to clicking to POR on the Config tab, which performs a soft-POR function (0x0F, Bit 6).

Status Tab

• Under the Status tab sheet (Figure 2), the user can either click on One Shot Read or Start Polling to display all the fault status and temperature data.
• This screen provides the user with several options, such as Auto Scale or the ability to manually select the Maximum Temperature or Minimum Temperature on the graph and alter the Sample History from 16 to 512.
• The Read Status button is used to read the current diode over/under-temp or diode fault status when auto-polling is off. When auto-polling is on (by clicking on the Start Polling button), then the current status is read at the Polling Rate.
• The Temp (°C) column shows the current or last polled temperature. If the Highest Temperature Enabled is selected (Config Tab), then the highest temperature will be shown in the Highest Temperature (°C) box in the Status area.
• The Read MTP Fault Log button will query the MTP Fault Logging registers and display whatever is logged there in Celsius. If nothing is logged, then No entry will be displayed.

Config Tab

• The Config tab (Figure 3) displays all the current values for the configuration resistors and allows the user to change nearly every configurable setting in the MAX31732. Configuration settings related to the MTP Fault Log are located on the Multi-Time Programmable (last tab). Check boxes are used for individual bit settings, a pull-down for the Ideality settings, and a floating-point entry for any temperature limits. Beta Value is a read-only value and is only shown if Beta Compensation is enabled.
• If the MAX31732 EVKIT, EN, and WP configuration jumpers (J7/J8) are set to allow the GUI to control them (WP and EN), the EN Pin and WP Pin sliders on the lower left can be used to drive those MAX31732 input pins.
• If auto-polling is turned off on the Status tab, then the actual I2C commands sent to the MAX31732 over the I2C bus (due to interacting with the controls on this tab) are shown in the Status Log at the bottom of the screen.
• PEC Enable is not allowed to be written to the MTP using this GUI.
• Refer to the MAX31732 datasheet for more details.

Register Tab

The Register tab (Figure 4) displays the status of all 74 addresses, 0x00 – 0x4A, register names, and their current data in HEX or Decimal. To read register values, use the Deselect All or Select All, as desired, or manually use the Select column to individually select RAM addresses, and click on the Read button. The user can similarly select those RAM addresses that are writable, edit the Value column as desired, and click the Write button.
The register map can simply be saved to or read from a . CSV Excel file by clicking on the Save To File or Read From File button.

I2C/SMBus Control Tab

• The I2C/SMBus Control Tab (Figure 5) allows the user to read and write the registers using HEX values. The One or Two-Bytes operations (in HEX) group box contains controls to read/write 1 or 2 Bytes at a time.
• To read or write a register, enter the desired register address in the Addr or Start Addr edit box and press the Read or Write button. The Bitwise Read/Write group box allows the user to read/write the data in binary format.
• To read or write, enter the registered address in the Address edit box and press the Read or Write button. The data bits can be flipped by pressing the bit buttons.
• The All 0’s, All 1’s, and Invert buttons are useful shortcuts to change all the bits at one time.

Multi-Time Programmable (MTP) Tab

• The MTP tab (Figure 6) allows the user to interact with the MTP memory, addresses 0x80 to 0xB9. It shows the register names, and when read, their values are displayed.
• The user can read all the registers or select All, select the desired register, and then click on Read. The user can set any of the MTP values except for the MTP fault logging region, 0x82–0x8D.
• When the chip is powered up, the MPT configuration register values get copied to the RAM. Using the MTP Config Load button, the user can cause all MTP configuration register values to be loaded into the RAM.
• Using the MTP Config Store button, the user can write the entire range of configuration registers in RAM to be stored in the MTP.
• Note that only configurable values have an equivalent space in the MTP, i.e., not temperature status, or command bits.
• The Config Store Single Word tool allows any configuration register to be written to the MTP individually, though at two bytes at a time.
• To use this tool, the user must change the register in RAM first, then use this tool to write the value from RAM to MTP.
• The User Software Revision Registers Write tool can be used to write a user software revision code or any other value into MTP address 0x80-0x81.
• Using the Fault Log Record section, the user can set up which channels to write into the fault logging section of the MTP in the event of an ALARM1 condition.
• The MTP Fault Log Enable bit is the controller enabled for this function.
• The user can also clear the fault log using the Clear MTP Fault Log button.
• Assuming that auto-polling is off in the Status Tab, what was sent to the MAX31732 can be seen over the I2C bus in the Status Log at the bottom of the screen.

Ordering Information

Denotes RoHS-compliant

Schematic Diagram

MAX31732EVKIT# Schematic Diagram

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Documents / Resources

| ANALOG DEVICES MAX31732EVKIT Four Channel Temperature Sensor [pdf] User Guide
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References

• Mixed-signal and digital signal processing ICs | Analog Devices
• Document Feedback Form | Analog Devices
• Mixed-signal and digital signal processing ICs | Analog Devices
• Support | Analog Devices

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