参数资料
型号: ADT7467BBZEVB
厂商: ON Semiconductor
文件页数: 44/72页
文件大小: 0K
描述: BOARD EVALUATION FOR ADT7467
产品变化通告: MFG CHG Notification ADI to ON Semi
标准包装: 1
系列: dBCool®
传感器类型: 温度
传感范围: -40°C ~ 120°C
接口: SMBus(2 线/I²C)
灵敏度: ±1.5°C
电源电压: 3 V ~ 5.5 V
嵌入式:
已供物品: 板,缆线,CD
已用 IC / 零件: ADT7467
其它名称: EVAL-ADT7467EBZ
EVAL-ADT7467EBZ-ND
ADT7467
point. Likewise, too high a T MIN value causes the operating
point to be exceeded, and, in turn, the ADT7467 reduces
T MIN to turn the fans on sooner to cool the system.
Programming Operating Point Registers
There are three operating point registers, one for each
temperature channel. These 8-bit registers allow the
operating point temperatures to be programmed with 1 ? C
resolution.
Operating Point Registers
Register 0x33, Remote 1 operating point = 0xA4
(100 ? C default)
Register 0x34, local temperature operating point = 0xA4
(100 ? C default)
Register 0x35, Remote 2 operating point = 0xA4
(100 ? C default)
Thermal Calibration
100%
OPERATING
POINT PWM MIN
Ramp Control
(Acoustic
Enhancement)
PWM
CONFIG
PWM
Generator
PWM1
REMOTE 2 =
CPU TEMP
T MIN T RANGE
Thermal Calibration
0%
100%
PWM
MIN
Tachometer 1
Measurement
PWM
CONFIG
TACH1
CPU FAN SINK
MUX
Ramp Control
(Acoustic
Enhancement)
PWM
Generator
PWM2
T MIN
100%
23
1
LOCAL =
VRM TEMP
REMOTE 1 =
AMBIENT TEMP
0%
T RANGE
Thermal Calibration
0%
T MIN
T RANGE
PWM
MIN
Tachometer 2
Measurement
Ramp Control
(Acoustic
Enhancement)
Tachometer 3
and 4
Measurement
PWM
CONFIG
PWM
Generator
TACH2
FRONT CHASSIS
PWM3
TACH3
Figure 68. Operating Point Value Dynamically Adjusts Automatic Fan Control Settings
REAR CHASSIS
STEP 10: High and Low Limits for Temperature Channels
If the temperature falls below the temperature channel’s
low limit, T MIN increases. This reduces fan speed, allowing
the system to heat up. An interrupt can be generated when
the temperature drops below the low limit.
If the temperature increases above the temperature
channel’s high limit, T MIN decreases. This increases fan
speed to 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 a low limit
are associated with each temperature channel. These 8-bit
registers allow the high and low limit temperatures to be
programmed with 1 ? C resolution.
Temperature Limit Registers
Register 0x4E, Remote 1 temperature low limit = 0x01
default
Register 0x4F, Remote 1 temperature high limit = 0x7F
default
Register 0x50, Local temperature low limit = 0x01 default
Register 0x51, Local temperature high limit = 0x7F default
Register 0x52, Remote 2 temperature low limit = 0x01
default
Register 0x53, Remote 2 temperature high limit = 0x7F
default
How Dynamic T MIN Control Works
The basic premise is as follows:
? Set the target temperature for the temperature zone, for
example, the Remote 1 thermal diode. This value is
programmed to the Remote 1 operating temperature
register.
? As the temperature in that zone (Remote 1 temperature)
exceeds the operating point temperature, T MIN is
reduced and the fan speed increases.
? As the temperature drops below the operating point
temperature, T MIN is increased and the fan speed is
reduced.
However, the loop operation is not as simple as described
in these steps. A number of conditions govern the situations
in which T MIN can increase or decrease.
http://onsemi.com
44
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