DS1996(3)

💖 DS1996 — 64kbit Memory iButton 💖

okay bestie, welcome to the One-Wire File System manual page for DS1996, section 3 of the man pages. yes it's giving "tiny chip with a whole personality" and yes we're gonna get through every single detail together. grab a snack. 🍓

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✨ SYNOPSIS ✨

Non-volatile memory. periodt.

0C [.]XXXXXXXXXXXX[XX][/[ memory | pages/page.[0-255|ALL] | address |
crc8 | id | locator | r_address | r_id | r_locator | type ]]

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🌈 FAMILY CODE 🌈

• 0C — this is the family code for the DS1996. that's its little ID badge, no cap.

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🎀 SPECIAL PROPERTIES 🎀

💾 memory

read-write, binary. it's 8192 bytes of memory, bestie. eight thousand one hundred and ninety-two. iconic storage energy. 👑

📄 pages/page.0 ... pages/page.255 pages/page.ALL

read-write, binary. the memory is split into 256 pages of 32 bytes each. ALL is an aggregate of the pages (so like, all of them, the whole squad 🫶). each page is accessed sequentially.

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⭐ STANDARD PROPERTIES ⭐

🏷️ address / r_address

read-only, ascii. this is 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. yes she does a little backwards walk, she contains multitudes. 💅

🔍 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).

👪 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 the 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 — it's still here, it's just not the moment anymore. 🙈

🔤 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. literally none. she is at peace. 😌

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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. multitasking queen, providing her own 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. so yes, everything is a file, we love a consistent interface. 💖

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. she said "correct > fast" and honestly? valid. 💅

🧠 DS1996

the DS1996 (3) is an iButton with static memory. data is read/written with error checking (transparent to the user). the DS1992, DS1993, DS1995, and DS1996 differ in their function by the amount of on-board memory they possess. (the internal protocols are slightly different, but the OWFS system handles this automatically.) so you don't gotta worry about it, bestie, OWFS has it covered. 🫶

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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. (yes, MUST. no vibes-based CRCs allowed. 💀)

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📄 DATASHEET 📄

http://pdfserv.maxim-ic.com/en/ds/DS1996.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 👑

Paul Alfille (paul.alfille@gmail.com)

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okay that's the whole page, bestie, you ate that. 💅✨ this was OWFS Manpage, dated 2003, and it's the DS1996(3) page — go forth and read your iButton's memory, you main character. 🦋💖