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Mark D. Studebaker
10bf57b3e7
Added some notes on w83781d. git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@328 7894878c-1315-0410-8ee3-d5d059ff63e0
109 lines
3.1 KiB
Plaintext
109 lines
3.1 KiB
Plaintext
Winbond 83781D driver
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---------------------
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Supports the following Winbond chips:
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Chip #vin #fanin #pwm #temp wchipid i2c ISA
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------------------------------------------------------------
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w83781d 7 3 0 3 0x10 yes yes
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w83782d 9 3 2-4 3 0x30 yes yes
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w83783s 5-6 3 2 1-2 0x40 yes no
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Stability
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---------
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w83781d: tested, stable
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w83782d: beta tested
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w83783s: untested
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/PROC ENTRIES
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-------------
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Varies depending on chip type.
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The driver only updates its values each 1.5 seconds; reading it more often
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will do no harm, but will return 'old' values.
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TO DO:
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-----
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782d beep 3 register
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782d programmable pins
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783s temp2 (labeled as temp1 in data sheet) at different location
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than 781d/782d, not implemented yet.
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781d R-T table
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782d/783s undocumented thermistor/PII/3904 select bits for pins 38-40
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782d/783s clock speed select
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NOTES:
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-----
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783s has no in1 for compatibility with the 781d/782d.
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783s pin is programmable for -5V or temp1; defaults to -5V,
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no control in driver so temp1 doesn't work.
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782d and 783s datasheets differ on which is pwm1 and which is pwm2.
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We chose to follow 782d.
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782d and 783s pin is programmable for fan3 input or pwm2 output;
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defaults to fan3 input.
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no control in driver so pwm2 doesn't work.
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782d has pwm1-2 for isa, pwm1-4 for i2c. (pwm3-4 share pins with
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the isa pins)
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Data sheet updates:
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------------------
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- Mask off lower bit of all ID registers.
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- PWM clock registers:
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000: master / 512
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001: master / 1024
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010: master / 2048
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011: master / 4096
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100: master / 8192
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Answers from Winbond tech support
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---------------------------------
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>
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> 1) In the W83781D data sheet section 7.2 last paragraph, it talks about
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> reprogramming the R-T table if the Beta of the thermistor is not
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> 3435K. The R-T table is described briefly in section 8.20.
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> What formulas do I use to program a new R-T table for a given Beta?
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>
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We are sorry that the calculation for R-T table value is
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confidential. If you have another Beta value of thermistor, we can help
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to calculate the R-T table for you. But you should give us real R-T
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Table which can be gotten by thermistor vendor. Therefore we will calculate
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them and obtain 32-byte data, and you can fill the 32-byte data to the
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register in Bank0.CR51 of W83781D.
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> 2) In the W83782D data sheet, it mentions that pins 38, 39, and 40 are
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> programmable to be either thermistor or Pentium II diode inputs.
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> How do I program them for diode inputs? I can't find any register
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> to program these to be diode inputs.
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--> You may program Bank0 CR[5Dh] and CR[59h] registers.
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CR[5Dh] bit 1(VTIN1) bit 2(VTIN2) bit 3(VTIN3)
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thermistor 0 0 0
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diode 1 1 1
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CR[59h] bit 4(VTIN1) bit 2(VTIN2) bit 3(VTIN3)
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PII thermal diode 1 1 1
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2N3904 diode 0 0 0
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Author/Maintainer
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-----------------
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Original 781D support: Frodo and Phil (lm78@stimpy.netroedge.com)
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782D/783S support added by: Mark D. Studebaker (mds@eng.paradyne.com)
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Send requests to the lm78@stimpy.netroedge.com mailing list.
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