DS2760(3) One-Wire File System DS2760(3)

# [NAME](#NAME)

**DS2760, DS2761, DS2762** - High-Precision Li+ Battery Monitor

# [SYNOPSIS](#SYNOPSIS)

## [Temperature Voltage and Current.](#Temperature_Voltage_and_Current.)

**30** \[.]XXXXXXXXXXXX\[XX]\[/\[ **amphours** | **current** | **currentbias** | **lock.\[0-1|ALL]** | **memory** | **pages/page.\[0-1|ALL]** | **PIO** | **sensed** | **temperature** | **vbias** | **vis** | **volt** | **volthours** |  
**cc** | **ce** | **coc** | **defaultpmod** | **defaultswen** | **dc** | **de** | **doc** | **mstr** | **ov** | **ps** | **pmod** | **swen** | **uv** |

See the file man3/standard\_mini.3so.

]]

## [Thermocouple](#Thermocouple)

**30** \[.]XXXXXXXXXXXX\[XX]\[/\[ **temperature** | **typeX/range\_low** | **typeX/range\_high** | **typeX/temperature** ]]

## [Weather Station](#Weather_Station)

**30** \[.]XXXXXXXXXXXX\[XX][/[ **WS603/temperature** | **WS603/wind\_speed** | **WS603/direction** | **WS603/volt** |  
**WS603/LED/status** | **WS603/LED/control.ALL** | **WS603/LED/model** |  
**WS603/calibrationwind\_speed** | **WS603/calibration/direction** |  
**WS603/light/intensity** | **WS603/light/threshold**

# [FAMILY CODE](#FAMILY_CODE)

*30*

# [SPECIAL PROPERTIES](#SPECIAL_PROPERTIES)

## [amphours](#amphours)

*read-write, floating point*  
Accumulated amperage read by current sensor. Units are in **Amp-hr** (Assumes internal 25mOhm resistor). Derived from *volthours* / Rinternal.  
Formally *amphours* is the integral of *current - currentbias* over time.

## [current](#current)

*read-only, floating point*  
Current reading. Units are in **Amp** (Assumes internal 25 mOhm resistor). Derived from *vis* / Rinternal.

## [currentbias](#currentbias)

*read-write, floating point*  
Fixed offset applied to each *current* measurement. Used in the *amphours* value. Assumes internal 25mOhm resistor. Units are **Amp** and range from -.08A to .08A.  
Derived from *vbias* / Rinternal.

## [lock.\[0-1|ALL\]](#lock._0-1_ALL_)

*read-write, yes-no*  
Lock either of the two eprom pages to prevent further writes. Apparently setting *lock* is permanent.

## [memory](#memory)

*read-write, binary*  
Access to the full 256 byte memory range. Much of this space is reserved or special use. User space is the *page* area.  
See the *DATASHEET* for a full memory map.

## [pages/pages.\[0-1|ALL\]](#pages/pages._0-1_ALL_)

*read-write, binary* Two 16 byte areas of memory for user application. The *lock* property can prevent further alteration.  
NOTE that the *page* property is different from the common *OWFS* implementation in that all of *memory* is not accessible.

## [PIO](#PIO)

*write-only, yes-no*  
Controls the PIO pin allowing external switching.  
Writing "1" turns the PIO pin on (conducting). Writing "0" makes the pin non-conducting. The logical state of the voltage can be read with the *sensed* property. This will reflect the current voltage at the pin, not the value sent to *PIO*  
Note also that *PIO* will also be altered by the power-status of the *DS2670* See the datasheet for details.

## [sensed](#sensed)

*read-only, yes-no*  
The logical voltage at the PIO pin. Useful only if the *PIO* property is set to "0" (non-conducting).  
Value will be 0 or 1 depending on the voltage threshold.

## [temperature](#temperature)

*read-only, floating point*  
*Temperature* read by the chip at high resolution (~13 bits). Units are selected from the invoking command line. See [**owfs(1)**](/man/os/owfs/owfs.1) or [**owhttpd(1)**](/man/os/owfs/owhttpd.1) for choices. Default is Celsius.  
Conversion is continuous.

## [vbias](#vbias)

*read-write, floating point*  
Fixed offset applied to each *vis* measurement. Used for the *volthours* value. Units are in **Volts.**  
Range -2.0mV to 2.0mV

## [vis](#vis)

*read-only, floating point*  
Current sensor reading (unknown external resistor). Measures the voltage gradient between the Vis pins. Units are in **Volts**  
The *vis* readings are integrated over time to provide the *volthours* property.  
The *current* reading is derived from *vis* assuming the internal 25 mOhm resistor is employed. There is no way to know this through software.

## [volt](#volt)

*read-only, floating point*  
Voltage read at the voltage sensor;. This is separate from the *vis* voltage that is used for *current* measurement. Units are **Volts**  
Range is between 0 and 4.75V

## [volthours](#volthours)

*read-write, floating point*  
Integral of *vis - vbias* over time. Units are in **volthours**

# [THERMOCOUPLE](#THERMOCOUPLE)

## [typeX/](#typeX/)

*directory*  
Thermocouple circuit using the *DS2760* to read the Seebeck voltage and the reference temperature. Since the type interpretation of the values read depends on the type of thermocouple, the correct directory must be chosen. Supported thermocouple types include types B, E, J, K, N, R, S and T.

## [typeX/range\_low typeX/ranges\_high](#typeX/range_low_typeX/ranges_high)

*read-only, flaoting point*  
The lower and upper temperature supported by this thermocouple (at least by the conversion routines). In the globally chosen temperature units.

## [typeX/temperature](#typeX/temperature)

*read-only, floating point*  
Thermocouple temperature. Requires a voltage and temperature conversion. Returned in globally chosen temperature units.  
Note: there are two types of temperature measurements possible. The *temperature* value in the main device directory is the reference temperature read at the chip. The *typeX/temperature* value is at the thermocouple junction, probably remote from the chip.

# [WEATHER STATION](#WEATHER_STATION)

## [WS603](#WS603)

*directory*  
Weather station from *AAG electronica* that includes temperature, wind speed, wind direction, light sensor and LED lights.

## [WS603/temperature](#WS603/temperature)

*read-only, floating-point*  
Uses the *DS2760* temperature sensor. This is equivalent to the *temperature* value. Again in the specificed temperature scale, default Celsius.

## [WS603/wind\_speed](#WS603/wind_speed)

*read\_only, floating-point*  
Readings from the anometer, scaled using the *WS603/calibration/wind\_speed*

## [WS603/direction](#WS603/direction)

*read\_only, unsigned integer*  
Wind direction, using the following table

1

N

2

NNE

3

NE

4

NEE

5

E

6

EES

7

ES

8

ESS

9

S

10

SSW

11

SW

12

SWW

13

W

14

WWN

15

WN

16

WWN

Values are adjusted (internally) by the *WS603/calibration/direction* property

## [WS603/volt](#WS603/volt)

*read-only, unsigned integer*  
Voltage value from the *WS603* device. Units and significance is unclear.

## [WS603/calibration/wind\_speed](#WS603/calibration/wind_speed)

*read-write, unsigned integer*  
Value between 1 and 200 for wind speed scaling. Values on of this range are ignored and the default value of 100 used.

## [WS603/calibration/direction](#WS603/calibration/direction)

*read-write, unsigned integer*  
Adjustment of wind direction. See datasheet.

## [WS603/light/intensity](#WS603/light/intensity)

*read-only, unsigned integer*  
Uncalibrated value from an internal light sensor. Used for control of LED display (daytime vs nighttime).

## [WS603/light/threshold](#WS603/light/threshold)

*read-only, unsigned integer*  
Threshold for internal light sensor. Used for control of LED display (daytime vs nighttime).

Value is set as value 4 of the array passed to *WS603/LED/control*

## [WS603/LED/status](#WS603/LED/status)

*read-only, unsigned integer*  
Status of LED lights intensities. See datasheet.

Value is set as values 2 and 3 of the array passed to *WS603/LED/control*

## [WS603/LED/model](#WS603/LED/model)

*read-only, unsigned integer*  
What factors control LED display. See datasheet.

Value is set as value 1 of the array passed to *WS603/LED/control.ALL*

## [WS603/LED/model](#WS603/LED/model~2)

*write-only, unsigned integer array of 4 values*  
Four integers sent to control LED display. All four values must be sent, comma separated.

0

Light mode

1

Light status

2

Light level

3

Light threshold

# [OBSCURE PROPERTIES](#OBSCURE_PROPERTIES)

## [cc ce coc dc de doc mstr ov pmod swen uv](#cc_ce_coc_dc_de_doc_mstr_ov_pmod_swen_uv)

*varies, yes-no*  
Bit flags corresponding to various battery management functions of the chip. See the *DATASHEET* for details of the identically named entries.  
In general, writing "0" corresponds to a 0 bit value, and non-zero corresponds to a 1 bit value.

## [defaultpmod defaultswen](#defaultpmod_defaultswen)

*read-write, yes-no*  
Default power-on state for the corresponding properties.

# [STANDARD PROPERTIES](#STANDARD_PROPERTIES)

See the file man3/standard.3so.

# [ALARMS](#ALARMS)

None.

# [DESCRIPTION](#DESCRIPTION)

See the file man3/description.3so.

## [DS2760 DS2761 DS2762](#DS2760_DS2761_DS2762)

The [**DS2760 (3)**](/man/os/owfs/DS2760.3) is a class of battery charging controllers. There are minor hardware difference between the **DS2760, DS2761** and **DS2762** battery chip, but they are indistinguishable to the software.

A number of interesting devices can be built with the **DS276x** including thermocouples. Support for thermocouples in built into the software, using the embedded thermister as the cold junction temperature.

For an explanation of the differences between the **DS276x** variants, see Dallas Application Note 221.

# [ADDRESSING](#ADDRESSING)

See the file man3/addressing.3so.

# [DATASHEET](#DATASHEET)

http://pdfserv.maxim-ic.com/en/ds/DS2760.pdf  
http://pdfserv.maxim-ic.com/en/an/app221.pdf  
http://www.aag.com.mx/aagusa/contents/en-us/Description%20of%20WSV3%20Interface%20(1-wire).pdf

# [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

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Document: DS2760(3) from owfs 3.2.4-r9 (Chainguard OS)
Source: https://github.com/owfs/owfs