DS2431(3)

💾 DS2431 — the One-Wire File System page, bestie edition 🦋

okay so welcome to the DS2431(3) page from the One-Wire File System (OWFS) manual, and lemme tell you, this little chip is giving tiny but mighty 💅

---

✨ NAME ✨

DS2431 — EEPROM (1 kBit) 💖

---

🌸 SYNOPSIS 🌸

Erasable programmable read-only memory (EEPROM)

2D [.]XXXXXXXXXXXX[XX][/[ memory | pages/page.[0-3|ALL] | address | crc8
| id | locator | r_address | r_id | r_locator | type ]]

---

🎀 FAMILY CODE 🎀

2D DS2431 — that's the family code, no cap ✨

---

💜 SPECIAL PROPERTIES 💜

memory 👑

• read-write, binary
• 128 bytes of EEPROM memory. Initially all bits are set to 1. Memory is non-volatile.

like, it remembers stuff even when the power dips. iconic behavior honestly 🫶

pages/page.0 ... pages/page.3 pages/page.ALL 📄

• read-write, yes-no
• Memory is split into 4 pages of 32 bytes each. ALL is an aggregate of the pages. Each page is accessed sequentially.

four lil pages, 32 bytes each, and ALL is just all of them holding hands 🌈

---

⭐ STANDARD PROPERTIES ⭐

address / r_address 🏠

• read-only, ascii
• The entire 64-bit unique ID. Given as upper case hexadecimal digits (0-9A-F).
• address starts with the family code
• r address is the address in reverse order, which is often used in other applications and labeling.

crc8 🔍

• read-only, ascii
• The 8-bit error correction portion. Uses cyclic redundancy check. Computed from the preceding 56 bits of the unique ID number. Given as upper case hexadecimal digits (0-9A-F).

the lil bouncer at the door checking that everything adds up 💅

family 👨👩👧

• read-only, ascii
• The 8-bit family code. Unique to each type of device. Given as upper case hexadecimal digits (0-9A-F).

id / r_id 🆔

• read-only, ascii
• The 48-bit middle portion of the unique ID number. Does not include the family code or CRC. Given as upper case hexadecimal digits (0-9A-F).
• r id is the id in reverse order, which is often used in other applications and labeling.

locator / r_locator 📍

• read-only, ascii
• Uses an extension of the 1-wire design from iButtonLink company that associated 1-wire physical connections with a unique 1-wire code. If the connection is behind a Link Locator the locator will show a unique 8-byte number (16 character hexadecimal) starting with family code FE. If no Link Locator is between the device and the master, the locator field will be all FF.
• r locator is the locator in reverse order.

present (DEPRECATED) 💀

• read-only, yes-no
• Is the device currently present on the 1-wire bus?

bestie it's DEPRECATED, so don't build your whole personality around it, mwah 💋

type 🏷️

• read-only, ascii
• Part name assigned by Dallas Semi. E.g. DS2401 Alternative packaging (iButton vs chip) will not be distiguished.

---

🚨 ALARMS 🚨

None. literally zero drama, we love a calm queen 🧘♀️

---

📖 DESCRIPTION 📖

1-Wire 🔌

1-wire is a wiring protocol and series of devices designed and manufactured by Dallas Semiconductor, Inc. The bus is a low-power low-speed low-connector scheme where the data line can also provide power.

Each device is uniquely and unalterably numbered during manufacture. There are a wide variety of devices, including memory, sensors (humidity, temperature, voltage, contact, current), switches, timers and data loggers. More complex devices (like thermocouple sensors) can be built with these basic devices. There are also 1-wire devices that have encryption included.

The 1-wire scheme uses a single bus master and multiple slaves on the same wire. The bus master initiates all communication. The slaves can be individually discovered and addressed using their unique ID.

Bus masters come in a variety of configurations including serial, parallel, i2c, network or USB adapters.

OWFS design 🌐

OWFS is a suite of programs that designed to make the 1-wire bus and its devices easily accessible. The underlying principle is to create a virtual filesystem, with the unique ID being the directory, and the individual properties of the device are represented as simple files that can be read and written.

Details of the individual slave or master design are hidden behind a consistent interface. The goal is to provide an easy set of tools for a software designer to create monitoring or control applications. There are some performance enhancements in the implementation, including data caching, parallel access to bus masters, and aggregation of device communication. Still the fundamental goal has been ease of use, flexibility and correctness rather than speed.

like yes the vibe is "filesystem but make it ✨sparkly✨" and honestly it ate 🔥

DS2431 💾

The DS2431 (3) is used for storing memory which should be available even after a reset or power off. It is also switch to erase-only mode (EPROM) although this isn't implemented in OWFS. OWFS system handles this automatically.

---

🗺️ ADDRESSING 🗺️

All 1-wire devices are factory assigned a unique 64-bit address. This address is of the form:

• Family Code — 8 bits
• Address — 48 bits
• CRC — 8 bits

Addressing under OWFS is in hexadecimal, of form:

01.123456789ABC

where 01 is an example 8-bit family code, and 12345678ABC is an example 48 bit address.

The dot is optional, and the CRC code can included. If included, it must be correct.

the CRC gotta be right or the whole thing is a no from me 🙅♀️

---

📄 DATASHEET 📄

http://pdfserv.maxim-ic.com/en/ds/DS2431.pdf

---

👀 SEE ALSO 👀

Programs 🖥️

owfs (1) owhttpd (1) owftpd (1) owserver (1) owdir (1) owread (1) owwrite (1) owpresent (1) owtap (1)

Configuration and testing 🧪

owfs (5) owtap (1) owmon (1)

Language bindings 🗣️

owtcl (3) owperl (3) owcapi (3)

Clocks ⏰

DS1427 (3) DS1904 (3) DS1994 (3) DS2404 (3) DS2404S (3) DS2415 (3) DS2417 (3)

ID 🆔

DS2401 (3) DS2411 (3) DS1990A (3)

Memory 🧠

DS1982 (3) DS1985 (3) DS1986 (3) DS1991 (3) DS1992 (3) DS1993 (3) DS1995 (3) DS1996 (3) DS2430A (3) DS2431 (3) DS2433 (3) DS2502 (3) DS2506 (3) DS28E04 (3) DS28EC20 (3)

Switches 🎚️

DS2405 (3) DS2406 (3) DS2408 (3) DS2409 (3) DS2413 (3) DS28EA00 (3) InfernoEmbedded (3)

Temperature 🌡️

DS1822 (3) DS1825 (3) DS1820 (3) DS18B20 (3) DS18S20 (3) DS1920 (3) DS1921 (3) DS1821 (3) DS28EA00 (3) DS28E04 (3) EDS0064 (3) EDS0065 (3) EDS0066 (3) EDS0067 (3) EDS0068 (3) EDS0071 (3) EDS0072 (3) MAX31826 (3)

Humidity 💧

DS1922 (3) DS2438 (3) EDS0065 (3) EDS0068 (3)

Voltage ⚡

DS2450 (3)

Resistance 🧲

DS2890 (3)

Multifunction (current, voltage, temperature) 🎛️

DS2436 (3) DS2437 (3) DS2438 (3) DS2751 (3) DS2755 (3) DS2756 (3) DS2760 (3) DS2770 (3) DS2780 (3) DS2781 (3) DS2788 (3) DS2784 (3)

Counter 🔢

DS2423 (3)

LCD Screen 🖼️

LCD (3) DS2408 (3)

Crypto 🔐

DS1977 (3)

Pressure 🎈

DS2406 (3) TAI8570 (3) EDS0066 (3) EDS0068 (3)

Moisture 🌊

EEEF (3) DS2438 (3)

---

🌈 AVAILABILITY 🌈

http://www.owfs.org

---

👑 AUTHOR 👑

Christian Magnusson (mag@mag.cx)

---

and that's the whole page bestie, you ate that reading session fr fr 💖✨🦋

this lil gem came from the OWFS Manpage, dated 2003, and it lives at section DS2431(3) — stan the 1-wire girlies, periodt 💅🎀