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| 型号： | ADT7490ARQZ-R7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 40/75页 |
| 文件大小： | 0K |
| 描述： | IC THERM MON FAN CTLR 24-QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi QSOP 24ld Pkg (MSL) Change 17/Jun/2010 Product Discontinuation 30/Sept/2011 |
| 标准包装： | 1,000 |
| 系列： | dBCool® |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 125°C |
| 精确度： | ±1.5°C（最小值） |
| 拓扑： | ADC，比较器，风扇速度计数器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 无 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 带卷 (TR) |
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ADT7490
The T THERM limit should be considered the maximum
worst-case operating temperature of the system. Because
exceeding any T THERM limit runs all fans at 100%, it has
very negative acoustic effects. Ultimately, this limit should
be set up as a fail-safe, and one should ensure that it is not
exceeded under normal system operating conditions.
Note that T THERM limits are non-maskable and affect the
fan speed no matter how automatic fan control settings are
configured. This allows some flexibility, because a T RANGE
value can be selected based on its slope, while a hard limit
(such as 70 ? C), can be programmed as T MAX (the
temperature at which the fan reaches full speed) by setting
T THERM to that limit (for example, 70 ? C).
Table 43. THERM REGISTERS
THERM Hysteresis
THERM hysteresis on a particular channel is configured
via the hysteresis settings in the following section (0x6D and
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 Hysteresis Register
Bits [7:4], Remote 1 Temperature Hysteresis (4 ? C default)
Bits [3:0], Local Temperature Hysteresis (4 ? C default)
Register 0x6E, Remote 2, PECI Temperature Hysteresis
Register
Bits [7:4], Remote 2 Temperature Hysteresis (4 ? C default)
Bits [3:0], PECI Temperature Hysteresis (4 ? C default)
Register
0x6A
0x6B
0x6C
0x3D
Description
Remote 1 THERM Limit
Local THERM Limit
Remote 2 THERM Limit
PECI T CONTROL Limit
Default
0x64 (100 ? C)
0x64 (100 ? C)
0x64 (100 ? C)
0x00 (0 ? C)
Because each hysteresis setting is four bits, hysteresis
values are programmable from 1 ? C to 15 ? C. It is not
recommended that hysteresis values ever be programmed 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 MIN ,
between normal speed and off, creating unsettling acoustic
noise.
T RANGE
100%
0%
T MIN
T THERM
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
RAMP
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM1
REMOTE2 =
CPU TEMP
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
PWM
MIN
TACHOMETER1
MEASUREMENT
PWM
CONFIG
RAMP
TACH1
CPU FAN SINK
MUX
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM2
T MIN
T RANGE
0%
PWM
TACHOMETER2
MEASUREMENT
TACH2
LOCAL =
VRM TEMP
THERMAL CALIBRATION
100%
MIN
PWM
CONFIG
RAMP
FRONT CHASSIS
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM3
T MIN
T RANGE
0%
TACHOMETER3
AND 4
MEASUREMENT
TACH3
REMOTE1 =
AMBIENT TEMP
Figure 59. How T THERM Relates to Automatic Fan Control
http://onsemi.com
40
REAR CHASSIS
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