Measuring Temperature through Stratix 10 DX

Question

Hi Intel Community Members,In the Stratix 10 DX, I wish to have the following clarification1. How to read temperature values from max6581?2. Address for reading the registers of max6581 from nios II through I2C IPcore? (Is it 0x4D or 0X9A?)3. How to convert the temperature hex value to real temperature value in Celsius or Fahrenheit?4. are the register address given in the max6581 datasheet should be considered as offset?5. Is there any reference design to read temperature values from intel of similar kind ?Kindly support me.Your comments are more valuable to me and highly appreciated.Thank you

manik · Answer

Please share your suggestions and ideas to get the above things done.

fvm · Answer

Hi,you are referring to a specific dev board? Does it come with example code for MAX6581 access?

manik · Answer

Hi @FvM,Thanks for your interest in helping me.Yes, I am referring to the board Stratix 10 Dx FPGA Development Board (https://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&amp;CategoryNo=248&amp;No=1258).No, the development board didn't come with any specific reference design to access MAX6581.For  you kind reference here with I have given the link for the FPGA Development Board manual,https://www.intel.com/content/www/us/en/docs/programmable/683561/current/supported-features.htmlBoard Schematichttps://www.intel.com/content/dam/altera-www/global/en_US/support/boards-kits/stratix10/dx_fpga/stratix-10-dx-dev-kit.pdfMAX6581 Datasheethttps://www.analog.com/media/en/technical-documentation/data-sheets/MAX6581.pdfBased on the information available over the manuals and documents, I attempted to create a system to access the temperature through Stratix 10 Dx FPGA with NIOS II and I2C(https://www.intel.com/content/www/us/en/docs/programmable/683130/22-1/fpga-i2c-host-core.html) and tried to read the temperature value through I2C functions in C, In that only I have the following queries.1. How to read the temperature values from max6581?2. Address for reading the registers of max6581 from nios II through I2C IPcore? (Is it 0x4D or 0X9A?)3. How to convert the temperature hex value to real temperature value in Celsius or Fahrenheit?4. are the registers addresses given in the max6581 datasheet should be considered as offset?5. Is there any reference design to read temperature values from intel of similar kind ? Kindy help me to get the temperature read through the FPGA.I appreciate your efforts.Thank you

fvm · Answer

Hi,o.k., no example shipped with the dev board, unfortunately.Personally, I'm accessing temperature monitors and fan controllers in HDL rather than NIOS, but embedded I2C host IP should work as well.Regarding address notation, originally I2C device addresses use 7-bit notation (0x4D, left aligned in first I2C byte. Maxim seems to prefer 8-bit notation (0x9A, right aligned). In host IP, you write 0x4D to TFR_CMD.AD (bit 7:1).As with many I2C devices, register address is written as single byte to MAX6581, then the register content is read. Typical I2C sequence is shown in datasheet.

manik · Answer

Hi,Thanks for your valuable suggestions.Yes I did it in both ways, that is with 9A and 4D but no response from the device.Could you please share me the info how you converted the register value you read through RTL from the devices to Celsius or Fahrenheit?I appreciate if there is any further references related to reading the data through NIOS II and I2C Host IPCore.

Forum Discussion

Measuring Temperature through Stratix 10 DX

10 Replies

Recent Discussions

Stratix 10 GX SI Board - issue with the Board Test System (BTS)

About PCIe Daughter Cards for Agilex™ 3 FPGA and SoC C‑Series Development Kit

DE10-Lite unable to flash?

Device stopped receiving config data: Internal error (0x0000, 0x00000000, 0x1800).

Available replacement for the discontinued P/N: MK-A5E065BB32AES1 ?