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ADT7473
Programming Operating Point Registers
There are three operating point registers, one for each
temperature channel. These 8-bit registers allow the
Table 50. OPERATING POINT REGISTERS
Register Description
Default
operating point temperatures to be programmed with 1 ? C
resolution.
0x33
0x34
0x35
Remote 1 Operating Point
Local Operating Point
Remote 2 Operating Point
0xA4 (100 ? C)
0xA4 (100 ? C)
0xA4 (100 ? C)
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
OPERATING
POINT
S
RAMP
CONTROL
(ACOUSTIC
PWM
GENERATOR
PWM1
ENHANCEMENT)
REMOTE2 =
CPU TEMP
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
PWM
MIN
TACHOMETER1
MEASUREMENT
RAMP
PWM
CONFIG
TACH1
CPU FAN SINK
MUX
S
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM2
T MIN
T RANGE
0%
PWM
TACHOMETER2
MEASUREMENT
PWM
TACH2
LOCAL =
VRM TEMP
THERMAL CALIBRATION
100%
MIN
RAMP
CONFIG
FRONT CHASSIS
S
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM3
T MIN
T RANGE
0%
TACHOMETER3
AND 4
MEASUREMENT
TACH3
REMOTE1 =
AMBIENT TEMP
REAR CHASSIS
Figure 67. Operating Point Value Dynamically Adjusts Automatic Fan Control Settings
Step 10: High and Low Limits for Temperature
Channels
The low limit defines the temperature at which the T MIN
value starts to be increased, if temperature falls below this
Table 51. TEMPERATURE LIMIT REGISTERS
Register Description
0x4E Remote 1 Temperature Low Limit
Default
0x01
value. This has the net effect of reducing the fan speed,
allowing the system to get hotter. An interrupt can be
generated when the temperature drops below the low limit.
The high limit defines the temperature at which the T MIN
value starts to be reduced, if temperature increases above
this value. This has the net effect of increasing fan speed to
0x4F
0x50
0x51
0x52
0x53
Remote 1 Temperature High Limit
Local Temperature Low Limit
Local Temperature High Limit
Remote 2 Temperature Low Limit
Remote 2 Temperature High Limit
0x7F
0x01
0x7F
0x01
0x7F
cool down the system. An interrupt can be generated when
the temperature rises above the high limit.
Programming High and Low Limits
There are six limit registers; a high limit and low limit are
associated with each temperature channel. These 8-bit
registers allow the high and low limit temperatures to be
How Dynamic T MIN Control Works
The basic premise is as follows:
1. Set the target temperature for the temperature
zone, which could be, for example, the Remote 1
thermal diode. This value is programmed to the
Remote 1 operating temperature register.
programmed with 1 ? C resolution.
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