Lines Matching +full:fan +full:- +full:0
10 Addresses scanned: I2C 0x2c - 0x2f
20 Addresses scanned: I2C 0x2c - 0x2f
24 http://pdfserv.maxim-ic.com/en/ds/DS1780.pdf
30 Addresses scanned: I2C 0x2c - 0x2f
37 - Frodo Looijaard <frodol@dds.nl>,
38 - Philip Edelbrock <phil@netroedge.com>,
39 - Michiel Rook <michiel@grendelproject.nl>,
40 - Grant Coady <gcoady.lk@gmail.com> with guidance
44 ---------
46 chip MSB 5-bit address. Each chip reports a unique manufacturer
50 -----------
52 microprocessor-based systems, providing measurement and limit comparison
54 temperature, two fan speeds and chassis intrusion. Measured values can
55 be read out via an I2C-compatible serial System Management Bus, and values
58 analog channels to ensure a fast interrupt response to any out-of-limit
67 ------------
71 each two seconds. User-space may read sysfs interface faster than the
76 with independent fan speed measurement cycles counting alternating rising
77 edges of the fan tacho inputs.
79 DS1780 measurement cycle is about once per second including fan speed.
81 LM81 measurement cycle is about once per 400ms including fan speed.
82 The LM81 12-bit extended temperature measurement mode is not supported.
85 -----------
86 On chip temperature is reported as degrees Celsius as 9-bit signed data
88 are 8-bit signed data with resolution of one degree Celsius.
93 Fan Speed
94 ---------
95 Two fan tacho inputs are provided, the ADM9240 gates an internal 22.5kHz
96 clock via a divider to an 8-bit counter. Fan speed (rpm) is calculated by:
100 Automatic fan clock divider
102 * User sets 0 to fan_min limit
104 - low speed alarm is disabled
105 - fan clock divider not changed
106 - auto fan clock adjuster enabled for valid fan speed reading
110 - low speed alarm is enabled
111 - fan clock divider set to max
112 - fan_min set to register value 254 which corresponds
114 - low speed alarm will be asserted if fan speed is
116 - auto fan clock adjuster disabled
118 * User sets reasonable fan speed
120 - low speed alarm is enabled
121 - fan clock divider set to suit fan_min
122 - auto fan clock adjuster enabled: adjusts fan_min
124 * User sets unreasonably high low fan speed limit
126 - resolution of the low speed limit may be reduced
127 - alarm will be asserted
128 - auto fan clock adjuster enabled: adjusts fan_min
130 * fan speed may be displayed as zero until the auto fan clock divider
131 adjuster brings fan speed clock divider back into chip measurement
135 -------------
136 An analog output provides a 0 to 1.25 volt signal intended for an external
137 fan speed amplifier circuit. The analog output is set to maximum value on
138 power up or reset. This doesn't do much on the test Intel SE440BX-2.
150 0 +2.5V 2500 3320 13.0
158 The reading is an unsigned 8-bit value, nominal voltage measurement is
166 -----------
167 The chip has five inputs to read the 5-bit VID and reports the mV value
171 -----------------
174 this pin. On an Intel SE440BX-2 the Chassis Intrusion header is
180 Clear the CI latch by writing value 0 to the sysfs intrusion0_alarm file.
182 Alarm flags reported as 16-bit word
187 0 +2.5 V_Error high or low limit exceeded
192 6 FAN1_Error fan low limit exceeded
193 7 FAN2_Error fan low limit exceeded
200 that alarm bits may be cleared on read, user-space may latch alarms and
201 provide the end-user with a method to clear alarm memory.