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ADT7476ARQZ-R7 Datasheet(PDF) 43 Page - ON Semiconductor

Part # ADT7476ARQZ-R7
Description  dBCOOL Remote Thermal Controller and Voltage Monitor
PDF  67 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

ADT7476ARQZ-R7 Datasheet(HTML) 43 Page - ON Semiconductor

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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 = 0x64 (100
°C default)
Register 0x6B, Local THERM Limit = 0x64 (100
°C default)
Register 0x6C, Remote 2 THERM Limit = 0x64 (100
°C default)
THERM Hysteresis
THERM hysteresis on a particular channel is configured
via the hysteresis settings (Register 0x6D and Register
0x6E). For example, setting hysteresis on the Remote 1
channel also sets the hysteresis on Remote 1 THERM.
Hysteresis Registers
Register 0x6D, Remote 1, Local Temperature Hysteresis
[7:4], Remote 1 temperature hysteresis (4
°C default).
[3:0], Local temperature hysteresis (4
°C default).
Register 0x6E, Remote 2 Temperature Hysteresis
[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 not
recommended to program hysteresis values to 0
°C, because
this disables hysteresis. In effect, this causes the fans to cycle
(during a THERM event) between normal speed and 100%
speed, or, while operating close to TMIN, between normal
speed and off, creating unsettling acoustic noise.
Figure 64. How TTHERM Relates to Automatic Fan Control
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
PWM
MIN
PWM
GENERATOR
PWM
MIN
PWM
GENERATOR
TACHOMETER 3
AND 4
MEASUREMENT
PWM
MIN
TACHOMETER 1
MEASUREMENT
TACHOMETER 2
MEASUREMENT
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
100%
PWM
CONFIG
PWM
CONFIG
PWM
CONFIG



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