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


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


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 30 [.]XXXXXXXXXXXX[XX][/[ temperature | typeX/range_low | typeX/range_high | typeX/temperature ]] 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




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 read-only, floating point Current reading. Units are in Amp (Assumes internal 25 mOhm resistor). Derived from vis / Rinternal. 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] read-write, yes-no Lock either of the two eprom pages to prevent further writes. Apparently setting lock is permanent. 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] 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 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 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 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) or owhttpd(1) for choices. Default is Celsius. Conversion is continuous. 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 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 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 read-write, floating point Integral of vis - vbias over time. Units are in volthours


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 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 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.


WS603 directory Weather station from AAG electronica that includes temperature, wind speed, wind direction, light sensor and LED lights. 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 read_only, floating-point Readings from the anometer, scaled using the WS603/calibration/wind_speed 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 read-only, unsigned integer Voltage value from the WS603 device. Units and significance is unclear. 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 read-write, unsigned integer Adjustment of wind direction. See datasheet. 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 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 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 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 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


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


See the file man3/standard.3so.




See the file man3/description.3so. DS2760 DS2761 DS2762 The 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 indistiguishable 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.


See the file man3/addressing.3so.


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 the file man3/seealso.3so.




Paul Alfille (paul.alfille@gmail.com) OWFS Manpage 2003 DS2760(3)

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