DS2760, DS2761, DS2762 − High-Precision Li+ Battery Monitor
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 |
]]
30 [.]XXXXXXXXXXXX[XX][/[ temperature | typeX/range_low | typeX/range_high | typeX/temperature ]]
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
30
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.
read-only,
floating point
Current reading. Units are in Amp (Assumes internal
25 mOhm resistor). Derived from vis / Rinternal.
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.
read-write,
yes-no
Lock either of the two eprom pages to prevent further
writes. Apparently setting lock is permanent.
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.
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.
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.
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.
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.
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
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.
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
read-write,
floating point
Integral of vis - vbias over time. Units are in
volthours
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.
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.
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.
directory
Weather station from AAG electronica that includes
temperature, wind speed, wind direction, light sensor and
LED lights.
read-only,
floating-point
Uses the DS2760 temperature sensor. This is
equivalent to the temperature value. Again in the
specificed temperature scale, default Celsius.
read_only,
floating-point
Readings from the anometer, scaled using the
WS603/calibration/wind_speed
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
read-only,
unsigned integer
Voltage value from the WS603 device. Units and
significance is unclear.
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.
read-write,
unsigned integer
Adjustment of wind direction. See datasheet.
read-only,
unsigned integer
Uncalibrated value from an internal light sensor. Used for
control of LED display (daytime vs nighttime).
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
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
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
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 |
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.
read-write,
yes-no
Default power-on state for the corresponding properties.
None.
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 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.
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
http://www.owfs.org
Paul Alfille ([email protected])