--- name: "DS2406" section: "3" platform: "linux" package: "owfs-doc" version: "3.2p4+dfsg1-6" release: "Debian 13 (Trixie)" platforms: ["linux"] url: "https://new.carta.tech/DS2406" --- # DS2406(3) Dual Addressable Switch with 1kbit Memory, Hidable Dual Addressable Switch with 1kbit Memory ## NAME **DS2406, DS2407** - Dual Addressable Switch with 1kbit Memory, Hidable Dual Addressable Switch with 1kbit Memory ## SYNOPSIS Dual Switch, Write-once Memory **12** \[.\]XXXXXXXXXXXX\[XX\]\[/\[ **channels** \| **latch.\[A\|B\|ALL\|BYTE\]** \| **memory** \| **pages/page.\[0-3\|ALL\]** \| **PIO.\[A\|B\|ALL\|BYTE\]** \| **power** \| **sensed.\[A\|B\|ALL\|BYTE\]** \| **set\_alarm** \| **TAI8570/\[sibling\|temperature\|pressure\]** \| **T8A/volt.\[0-7,ALL\]** **address** \| **crc8** \| **id** \| **locator** \| **r\_address** \| **r\_id** \| **r\_locator** \| **type** \]\] ## FAMILY CODE *12* ## SPECIAL PROPERTIES ### channels *read-only, unsigned integer*\ Is this a 1 or 2 channel switch? The *DS2406* comes in two forms, one has only one *PIO* pin (PIO.A). Returns 1 or 2. ### latch.A latch.B latch.ALL latch.BYTE *read-write, yes-no*\ The activity latch is set to 1 with the first negative or positive edge detected on the associated PIO channel.\ Writing any data will clear latch for all (both)) channels. This is a hardware "feature" of the chip.\ *ALL* references both channels simultaneously, comma separated\ *BYTE* references both channels simultaneously as a single byte, with channel A in bit 0. ### memory *read-write, binary*\ 128 bytes of non-volatile, write-once data. ### pages/page.0 ... pages/page.3 pages/page.ALL *read-write, binary*\ Memory organized as 4 pages or 32 bytes. Memory is write-once.\ *ALL* is the aggregate of all 4 pages, sequentially accessed. ### PIO.A PIO.B PIO.ALL PIO.BYTE *read-write, yes-no*\ State of the open-drain output ( *PIO* ) pin. 0 = non-conducting (off), 1 = conducting (on).\ Writing zero will turn off the switch, non-zero will turn on the switch. Reading the *PIO* state will return the switch setting (flipflop in the data sheet). To determine the actual logic level at the switch, refer to the *sensed* property.\ Note that the actual pin setting for the chip uses the opposite polarity -- 0 for conducting, 1 for non-conducting. However, to turn a connected device on (i.e. to deliver power) we use the software concept of 1 as conducting or "on".\ *ALL* references both channels simultaneously, comma separated.\ *BYTE* references both channels simultaneously as a single byte, with channel A in bit 0. ### power *read-only, yes-no*\ Is the *DS2406* powered parasitically =0 or separately on the Vcc pin =1 ### sensed.A sensed.B sensed.ALL sensed.BYTE *read-only, yes-no*\ Logic level at the *PIO* pin. 0 = ground. 1 = high (~2.4V - 5V ). Really makes sense only if the *PIO* state is set to zero (off), else will read zero.\ *ALL* references both channels simultaneously, comma separated.\ *BYTE* references both channels simultaneously as a single byte, with channel A in bit 0. ### set\_alarm *read-write, unsigned integer (0-331)*\ A number consisting of three digits XYZ, where: - X channel selection\ *0* neither\ *1* A only\ *2* B only\ *3* A or B - Y source selection\ *0* undefined\ *1* latch\ *2* PIO\ *3* sensed - Z polarity selection\ *0* low\ *1* high All digits will be truncated to the 0-3 (or 0-1) range. Leading zeroes are optional (and may be problematic for some shells). Example: - 311 Responds on Conditional Search when either latch.A or latch.B (or both) are set to 1. - \<100 Never responds to Conditional Search. ### TAI8570/ *subdirectory*\ Properties when the *DS2406 (3)* is built into a *TAI8570.*\ If the *DS2406 (3)* is not part of a *TAI8570* or is not the controlling switch, attempts to read will result in an error. ### TAI8570/pressure *read-only, floating point*\ Barometric *pressure* in millibar. ### TAI8570/sibling *read-only, ascii*\ Hex address of the *DS2406 (3)* paired with this chip in a *TAI8570.* ### TAI8570/temperature *read-only, floating-point*\ Ambient *temperature* measured by the *TAI8570* in prevailing temperature units (Centigrade is the default). ### T8A/volt.\[0-7\|ALL\] *read-only, floating-point*\ Uses the T8A (by *Embedded Data Systems* ) 8 channel voltage converter. Units in volts, 0 to 5V range. 12 bit resolution. ## 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). ### 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? ### type *read-only, ascii*\ Part name assigned by Dallas Semi. E.g. *DS2401* Alternative packaging (iButton vs chip) will not be distiguished. ## ALARMS Use the *set\_alarm* property to set the alarm triggering criteria. ## 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. ### DS2406 The **DS2406 (3)** allows control of other devices, like LEDs and relays. It superceeds the **DS2405** and **DS2407** Alternative switches include the **DS2408** or even **DS2450**\ The **DS2407** is practically identical to the *DS2406* except for a strange *hidden* mode. It is supported just like the **DS2406** ### TAI8570 The *TAI-8570 Pressure Sensor* is based on a 1-wire composite device by *AAG Electronica.* The *TAI8570* uses 2 *DS2406 (3)* chips, paired as a reader and writer to synthesize 3-wire communication. Only 1 of the *DS2406 (3)* will allow *temperature* or *pressure* readings. It's mate's address can be shown as *sibling.* The *TAI8570* uses the *Intersema MS5534a* pressure sensor, and stores calibration and temperature compensation values internally. Design and code examples are available from AAG Electronica http://aag.com.mx , specific permission to use code in a GPL product was given by Mr. Aitor Arrieta of AAG and Dr. Simon Melhuish of OWW. ## 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. ## DATASHEET http://pdfserv.maxim-ic.com/en/ds/DS2406.pdf\ http://pdfserv.maxim-ic.com/en/ds/DS2407.pdf\ http://www.embeddeddatasystems.com/page/EDS/PROD/IO/T8A\ http://oww.sourceforge.net/hardware.html#bp ## 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 Paul Alfille (paul.alfille@gmail.com)