mirror of
https://github.com/lm-sensors/lm-sensors.git
synced 2026-10-29 12:50:43 +00:00
Mark D. Studebaker
3ccf39c7d0
Added RT table read to 781d but then #undef'ed it since it was just all 1's. Changed max entries in sensor.c to 32 bytes to handle RT table. git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@335 7894878c-1315-0410-8ee3-d5d059ff63e0
125 lines
3.6 KiB
Plaintext
125 lines
3.6 KiB
Plaintext
Winbond 83781D driver
|
|
---------------------
|
|
Supports the following Winbond chips:
|
|
|
|
Chip #vin #fanin #pwm #temp wchipid i2c ISA
|
|
------------------------------------------------------------
|
|
w83781d 7 3 0 3 0x10 yes yes
|
|
w83782d 9 3 2-4 3 0x30 yes yes
|
|
w83783s 5-6 3 2 1-2 0x40 yes no
|
|
|
|
|
|
Stability
|
|
---------
|
|
w83781d: tested, stable
|
|
w83782d: beta tested
|
|
w83783s: untested
|
|
|
|
|
|
/PROC ENTRIES
|
|
-------------
|
|
Varies depending on chip type. Most are identical to the lm78 entries.
|
|
See the lm78 documentation for details.
|
|
|
|
Additional entries:
|
|
pwm[1-4]: (782d/783s only)
|
|
Controls the speed of the fans with PWM (Pulse Width Modulation)
|
|
Valid values:
|
|
0 - 255. 255 = max speed.
|
|
|
|
sensor[1-3]: (782d/783s only)
|
|
Controls the sensor type. To change to a different
|
|
sensor type, for example, do 'echo 2 > sensor1'.
|
|
Valid values:
|
|
1: Pentium II / Celeron diode
|
|
2: 2N3904 Transistor in a diode configuration
|
|
3435: Thermistor with Beta = 3435. Beta is a measure
|
|
of sensitivity to temperature.
|
|
|
|
|
|
The driver only updates its values each 1.5 seconds; reading it more often
|
|
will do no harm, but will return 'old' values.
|
|
|
|
|
|
TO DO:
|
|
-----
|
|
782d beep 3 register
|
|
782d programmable pins
|
|
783s temp2 (labeled as temp1 in data sheet) at different location
|
|
than 781d/782d, not implemented yet.
|
|
781d R-T table
|
|
782d/783s clock speed select
|
|
|
|
|
|
NOTES:
|
|
-----
|
|
783s has no in1 for compatibility with the 781d/782d.
|
|
|
|
783s pin is programmable for -5V or temp1; defaults to -5V,
|
|
no control in driver so temp1 doesn't work.
|
|
|
|
782d and 783s datasheets differ on which is pwm1 and which is pwm2.
|
|
We chose to follow 782d.
|
|
|
|
782d and 783s pin is programmable for fan3 input or pwm2 output;
|
|
defaults to fan3 input.
|
|
no control in driver so pwm2 doesn't work.
|
|
|
|
782d has pwm1-2 for isa, pwm1-4 for i2c. (pwm3-4 share pins with
|
|
the isa pins)
|
|
|
|
|
|
|
|
Data sheet updates:
|
|
------------------
|
|
- Mask off lower bit of all ID registers.
|
|
|
|
- PWM clock registers:
|
|
|
|
000: master / 512
|
|
001: master / 1024
|
|
010: master / 2048
|
|
011: master / 4096
|
|
100: master / 8192
|
|
|
|
|
|
Answers from Winbond tech support
|
|
---------------------------------
|
|
>
|
|
> 1) In the W83781D data sheet section 7.2 last paragraph, it talks about
|
|
> reprogramming the R-T table if the Beta of the thermistor is not
|
|
> 3435K. The R-T table is described briefly in section 8.20.
|
|
> What formulas do I use to program a new R-T table for a given Beta?
|
|
>
|
|
We are sorry that the calculation for R-T table value is
|
|
confidential. If you have another Beta value of thermistor, we can help
|
|
to calculate the R-T table for you. But you should give us real R-T
|
|
Table which can be gotten by thermistor vendor. Therefore we will calculate
|
|
them and obtain 32-byte data, and you can fill the 32-byte data to the
|
|
register in Bank0.CR51 of W83781D.
|
|
|
|
|
|
> 2) In the W83782D data sheet, it mentions that pins 38, 39, and 40 are
|
|
> programmable to be either thermistor or Pentium II diode inputs.
|
|
> How do I program them for diode inputs? I can't find any register
|
|
> to program these to be diode inputs.
|
|
--> You may program Bank0 CR[5Dh] and CR[59h] registers.
|
|
|
|
CR[5Dh] bit 1(VTIN1) bit 2(VTIN2) bit 3(VTIN3)
|
|
|
|
thermistor 0 0 0
|
|
diode 1 1 1
|
|
|
|
|
|
CR[59h] bit 4(VTIN1) bit 2(VTIN2) bit 3(VTIN3)
|
|
|
|
PII thermal diode 1 1 1
|
|
2N3904 diode 0 0 0
|
|
|
|
|
|
Author/Maintainer
|
|
-----------------
|
|
Original 781D support: Frodo and Phil (lm78@stimpy.netroedge.com)
|
|
782D/783S support added by: Mark D. Studebaker (mds@eng.paradyne.com)
|
|
Send requests to the lm78@stimpy.netroedge.com mailing list.
|