DS28EC20(3)

💖 DS28EC20 💖

okay bestie, welcome to the manual page for DS28EC20 — that's the one from the One-Wire File System section 3 club 🎀 (like DS28EC20(3), iykyk). She's an EEPROM, she's 20 kBit, and she remembers stuff even when the lights go out. main character energy fr 💅

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✨ NAME ✨

DS28EC20 — EEPROM (20 kBit) 🧠💾

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🌸 SYNOPSIS 🌸

Erasable programmable read-only memory (EEPROM)

43 [.]XXXXXXXXXXXX[XX][/[ memory | pages/page.[0-79|ALL] | address |
crc8 | id | locator | r_address | r_id | r_locator | type ]]

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🦋 FAMILY CODE 🦋

• 23 → DS28EC20

(that's her family code bestie, her little 1-wire surname 💜)

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🎀 SPECIAL PROPERTIES 🎀

memory

read-write, binary

512 bytes of memory, periodt. Initially all bits are set to 1. And listen — writing zero permanently alters the memory. Like, gone-gone. No undo button, no take-backsies 😭 so be careful out there.

pages/page.0 ... pages/page.79 pages/page.ALL

read-write, yes-no

Memory is split into 80 pages of 32 bytes each. ALL is an aggregate of the pages. Each page is accessed sequentially. Slay 💅

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⭐ 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). She checks herself before she wrecks herself ✅

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 this one is deprecated, so maybe don't build your whole personality around it 🙈)

type

read-only, ascii

Part name assigned by Dallas Semi. E.g. DS2401. Alternative packaging (iButton vs chip) will not be distiguished. 💀

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🔔 ALARMS 🔔

None. Not a single alarm. She's chill like that 😌

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📖 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. So the wire is doing double duty, we love a multitasker 💪✨

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. One leader, many girlies, all on the same wire 💅

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. It's giving "everything is a file" and honestly? iconic 🗂️✨

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. Correct > fast, no cap 🫶

DS28EC20

The DS28EC20 (3) is used for storing memory which should be available even after a reset or power off. It's main advantage is for audit trails (i.e. a digital purse). OWFS system handles this automatically. She never forgets, bestie 👜💖

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🧭 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. No pressure but like... it must be correct 💀

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📄 DATASHEET 📄

http://datasheets.maxim-ic.com/en/ds/DS28EC20.pdf

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👀 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)

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🌈 AVAILABILITY 🌈

http://www.owfs.org

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💜 AUTHOR 💜

Christian Magnusson (mag@mag.cx)

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and that's the whole vibe bestie — go read your EEPROM, but remember: writing zero is forever 😭💅

OWFS Manpage, 2003, DS28EC20(3) — mwah, take care of her, she's fragile but iconic 🎀✨🦋🌸💖