ADT7476A
http://onsemi.com
42
Table 48. THERM
LIMIT REGISTERS
Register
Description
Default
0x6A
Remote 1 THERM
Limit
0x64 (100癈)
0x6B
Local THERM
Limit
0x64 (100癈)
0x6C
Remote 2 THERM
Limit
0x64 (100癈)
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癈 default).
[3:0], Local temperature hysteresis (4癈 default).
Register 0x6E, Remote 2 Temperature Hysteresis
[7:4], Remote 2 temperature hysteresis (4癈 default).
Because each hysteresis setting is four bits, hysteresis
values are programmable from 1癈 to 15癈. It is not
recommended to program hysteresis values to 0癈, 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 T
MIN
, between normal
speed and off, creating unsettling acoustic noise.
Figure 64. How T
THERM
Relates to Automatic Fan Control
THERMAL CALIBRATION
REMOTE1 =
AMBIENT TEMP
100%
0%
T
MIN
T
RANGE
PWM
MIN
MUX
S
TACHOMETER1
MEASUREMENT
S
S
PWM
MIN
PWM
MIN
THERMAL CALIBRATION
100%
0%
T
MIN
T
RANGE
THERMAL CALIBRATION
100%
0%
T
MIN
T
RANGE
LOCAL =
VRM TEMP
REMOTE2 =
CPU TEMP
TACHOMETER2
MEASUREMENT
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
TACHOMETER3
AND 4
MEASUREMENT
PWM
CONFIG
PWM
GENERATOR
PWM1
PWM2
PWM3
TACH3
TACH2
TACH1
CPU FAN SINK
FRONT CHASSIS
REAR CHASSIS
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
CONFIG
PWM
GENERATOR
PWM
CONFIG
PWM
GENERATOR
T
MIN
100%
0%
T
THERM
T
RANGE
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