DS2406(3) One-Wire File System DS2406(3) # [NAME](#NAME) **DS2406, DS2407** - Dual Addressable Switch with 1kbit Memory, Hidable Dual Addressable Switch with 1kbit Memory # [SYNOPSIS](#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]** See the file man3/standard\_mini.3so. ]] # [FAMILY CODE](#FAMILY_CODE) *12* # [SPECIAL PROPERTIES](#SPECIAL_PROPERTIES) ## [channels](#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](#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](#memory) *read-write, binary* 128 bytes of non-volatile, write-once data. ## [pages/page.0 ... pages/page.3 pages/page.ALL](#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](#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](#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](#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](#set_alarm) *read-write, unsigned integer (0-331)* A number consisting of three digits XYZ, where: [X](#X) channel selection *0* neither *1* A only *2* B only *3* A or B [Y](#Y) source selection *0* undefined *1* latch *2* PIO *3* sensed [Z](#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/](#TAI8570/) *subdirectory* Properties when the [*DS2406 (3)*](/man/os/owfs/DS2406.3) is built into a *TAI8570.* If the [*DS2406 (3)*](/man/os/owfs/DS2406.3) is not part of a *TAI8570* or is not the controlling switch, attempts to read will result in an error. ## [TAI8570/pressure](#TAI8570/pressure) *read-only, floating point* Barometric *pressure* in millibar. ## [TAI8570/sibling](#TAI8570/sibling) *read-only, ascii* Hex address of the [*DS2406 (3)*](/man/os/owfs/DS2406.3) paired with this chip in a *TAI8570.* ## [TAI8570/temperature](#TAI8570/temperature) *read-only, floating-point* Ambient *temperature* measured by the *TAI8570* in prevailing temperature units (Centigrade is the default). ## [T8A/volt.\[0-7|ALL\]](#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](#STANDARD_PROPERTIES) See the file man3/standard.3so. # [ALARMS](#ALARMS) Use the *set\_alarm* property to set the alarm triggering criteria. # [DESCRIPTION](#DESCRIPTION) See the file man3/description.3so. ## [DS2406](#DS2406) The [**DS2406 (3)**](/man/os/owfs/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](#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)*](/man/os/owfs/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](#ADDRESSING) See the file man3/addressing.3so. # [DATASHEET](#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](#SEE_ALSO) See the file man3/seealso.3so. # [AVAILABILITY](#AVAILABILITY) http://www.owfs.org # [AUTHOR](#AUTHOR) Paul Alfille (paul.alfille@gmail.com) 2003 OWFS Manpage --- Document: DS2406(3) from owfs 3.2.4-r10 (Chainguard OS) Source: https://github.com/owfs/owfs