Is the TMGetFamilySpec function supported for the DS2431 device when using the TMEX API?

The TMGetFamilySpec function may not be supported for the DS2431 device, as it is likely reserved for other 1-Wire devices. While the DS2431 uses the standard 1-Wire protocol for communication, support for specific TMEX API functions can vary by device. If you're encountering issues, ensure that the correct device type is specified and consult the latest documentation or updates related to TMEX API compatibility with the DS2431. For more information, refer to the 1-Wire Software Resource Guide Device Description | Analog Devices .

How to check if a 1-Wire EEPROM is soldered correctly?

Answer: For example, here’s how to verify if a DS2431 is properly soldered to a PCB using a multimeter. This method does not confirm full functionality but simply checks the presence of the ESD protection diode. If you need to ensure the EEPROM was not damaged during assembly, further functional tests will be required. Steps: Set the multimeter to diode test mode. Connect the red lead to the trace that feeds to the ground connection of the DS2431. Connect the black lead to the trace that feeds to the 1-Wire I/O connection of the DS2431. A properly soldered connection should show a voltage drop of approximately 0.6V (typically between 0.5V and 0.8V). If the reading is significantly different or absent, inspect the solder joints and PCB traces for potential issues.

Does the DS2431 comply with the RoHS standard?

The DS2431+ complies with RoHS. Please see the attached letter of conformity.

After writing to the Scratchpad I am getting a correct CRC value however, that value changed when I try to read it afterward, why?

The DS2431 has a volatile scratchpad, so that may be the reason you are seeing random values. Page 8 paragraph 2 of the datasheet states that i n addition to the main EEPROM array, an 8-byte volatile scratchpad is included. Writes to the EEPROM array are a two-step process. First, data is written to the scratchpad and then copied into the main array. This allows the user to first verify the data written to the scratchpad prior to copying into the main array. The device only supports full row (8-byte) copy operations. For data in the scratchpad to be valid for a copy operation, the address supplied with a Write Scratchpad command must start on a row boundary, and 8 full bytes must be written into the scratchpad. If you try to read the scratchpad after turning the system off and then on again then the old scratch pad value will not be stored in it.

DS2431, DS28E22, one wire bus coexistence

Question: Is it possible to have both DS2431 and DS28E22 on the one-wire bus? Answer: No. The DS2431 supports both standard and overdrive 1-Wire modes, while the DS28E22 only supports overdrive. Given this, they cannot reside together on the same bus; however, we have newer secure authenticators that can support this (i.e., DS28E36, DS28E38, DS28E50).

How do I set DS2431 pages to read only and back?

The DS2431 offers write-protection for its memory pages. See page 7 of the datasheet for details. Addresses 0x80 through 0x84 are the write-protection bytes. Each of these byte-sized memory locations control write-protection for pages 0-3. For example, writing 0x55 to address 0x80 write-protects page 0, writing a 0x55 to address 0x81 write-protects page 1, etc. Keep in mind that once you set the write-protection up for a particular page, you cannot change the page back to an unprotected page. It becomes read-only with no way to write to the page again. The OneWireViewer provides an easy way to test the write-protection bytes. Simply write some data in page 0. Then write 0x55 at address 0x80 to write-protect page 0. Then, try writing to page 0 again with different data. It should be unsuccessful.

Where can I find the 64 bit ROM ID of 1-wire devices?

A 2D BARCODE should be on the shipping box, containing both the start and end ROM code for the given lot. But if you want the complete ID number you must read it electronically, for example with the Onewireviewer.

Can a DS2465 replace the older master DS2484, but still be able to read the smart cell DS2431?

Question: Can a new master DS2465 to replace the older master DS2484, but still be able to read the smart cell DS2431? Answer: Yes, the DS2465 can be utilized as a master to the DS2431.

For the newer secure authentication chips DS28E36, DS28E38, DS28E50, what master chip you would recommend that can work with both the newer chip and older DS2431?

Question: For the newer secure authentication chips DS28E36, DS28E38, DS28E50, what master chip you would recommend that can work with both the newer chip and older DS2431? Answer: The DS28E84 can support I2C to 1-Wire for DS28E36, DS28E38, and DS2431. However, if a secure coprocessor is required, then the optional DS2476 is available separately (coprocessor only, not a 1-Wire master). As for the DS28E50, we have DS2477 as well that implements as both a SHA3 secure coprocessor and I2C to 1-Wire master that could be used directly with the DS2431