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ADT7467ARQZ-R7 Datasheet(PDF) 48 Page - ON Semiconductor

Part # ADT7467ARQZ-R7
Description  dBCool Remote Thermal Monitor and Fan Controller
PDF  77 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

ADT7467ARQZ-R7 Datasheet(HTML) 48 Page - ON Semiconductor

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ADT7467
Rev. 3 | Page 48 of 77 | www.onsemi.com
Note that the TTHERM limits are nonmaskable and affect the fan
speed regardless of the configuration of the automatic fan
control settings. This allows some flexibility, because a TRANGE
value can be selected based on its slope, and a hard limit (such
as 70°C) can be programmed as TMAX (the temperature at which
the fan reaches full speed) by setting TTHERM to that limit (for
example, 70°C).
THERM Limit Registers
Register 0x6A, Remote 1 THERM limit = 0xA4 (100°C default)
Register 0x6B, local THERM limit = 0xA4 (100°C default)
Register 0x6C, Remote 2 THERM limit = 0xA4 (100°C default)
Hysteresis Registers
Register 0x6D, Remote 1 and local hysteresis register
<7:4>, Remote 1 temperature hysteresis (4°C default)
<3:0>, local temperature hysteresis (4°C default)
Register 0x6E, Remote 2 temperature hysteresis register
<7:4>, Remote 2 temperature hysteresis (4°C default)
Because each hysteresis setting is four bits, hysteresis values are
programmable from 1°C to 15°C. It is recommended that
hysteresis values are not programmed to 0°C because this
disables hysteresis. In effect, this would cause the fans to cycle
between normal speed and 100% speed, creating unsettling
acoustic noise.
TMIN
0%
100%
TTHERM
TRANGE
REAR CHASSIS
FRONT CHASSIS
CPU FAN SINK
LOCAL =
VRM TEMP
PWM1
PWM2
TACH1
TACH2
TACH3
PWM3
REMOTE 1 =
AMBIENT TEMP
REMOTE 2 =
CPU TEMP
MUX
THERMAL CALIBRATION
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
TACHOMETER 1
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 2
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 3
AND 4
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
100%
Figure 67. How T
THERM Relates to Automatic Fan Control



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