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Table 48. THERM LIMIT REGISTERS
Register
0x6A
Remote 1 THERM Limit
0x6B
Local THERM Limit
0x6C
Remote 2 THERM Limit
THERM Hysteresis
THERM hysteresis on a particular channel is configured
via
the
hysteresis
Register 0x6E). For example, setting hysteresis on the
Remote 1 channel also sets the hysteresis on Remote 1
THERM.
REMOTE2 =
CPU TEMP
LOCAL =
VRM TEMP
REMOTE1 =
AMBIENT TEMP
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Description
0x64 (100°C)
0x64 (100°C)
0x64 (100°C)
settings
(Register 0x6D
T
RANGE
100%
0%
T
T
MIN
THERM
THERMAL CALIBRATION
100%
0%
T
T
MIN
RANGE
THERMAL CALIBRATION
100%
0%
T
T
MIN
RANGE
THERMAL CALIBRATION
100%
0%
T
T
MIN
RANGE
Figure 64. How T
ADT7476A
Hysteresis Registers
Register 0x6D, Remote 1, Local Temperature Hysteresis
Default
[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
and
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 T
speed and off, creating unsettling acoustic noise.
PWM
MIN
PWM
CONFIG
PWM
S
GENERATOR
TACHOMETER1
MEASUREMENT
PWM
MIN
PWM
CONFIG
PWM
S
MUX
GENERATOR
TACHOMETER2
MEASUREMENT
PWM
MIN
PWM
CONFIG
PWM
S
GENERATOR
TACHOMETER3
AND 4
MEASUREMENT
Relates to Automatic Fan Control
THERM
www.onsemi.com
45
, between normal
MIN
RAMP
CONTROL
PWM1
(ACOUSTIC
ENHANCEMENT)
TACH1
CPU FAN SINK
RAMP
CONTROL
PWM2
(ACOUSTIC
ENHANCEMENT)
TACH2
RAMP
FRONT CHASSIS
CONTROL
PWM3
(ACOUSTIC
ENHANCEMENT)
TACH3
REAR CHASSIS
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