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| 型号： | ADT7475ARQZ |
| 厂商： | ON Semiconductor |
| 文件页数： | 37/58页 |
| 文件大小： | 0K |
| 描述： | IC REMOTE THERMAL CTRLR 16-QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation 30/Sept/2011 |
| 标准包装： | 98 |
| 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，外部传感器 |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 托盘 |
| 产品目录页面： | 1118 (CN2011-ZH PDF) |
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ADT7475
temperature drive the CPU fan connected to PWM1.
Ambient temperature drives the front chassis fan and rear
chassis fan connected to PWM2 and PWM3. The front
chassis fan is configured to run at PWM MIN = 20%. The rear
chassis fan is configured to run at PWM MIN = 30%. The
CPU fan is configured to run at PWM MIN = 10%.
Note that the control range for 4-wire fans is much wider
than that for 3-wire fans. In many cases, 4-wire fans can start
with a PWM drive of as little as 20% or less. In extreme
cases, some 3-wire fans do not run unless a PWM drive of
60% or more is applied.
100
VRM TEMP.
90
80
number programmed into the hysteresis registers (0x6D and
0x6E). The default hysteresis value is 4 ° C.
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 the designer 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).
70
60
CPU TEMPERATURE
Table 44. THERM REGISTERS
50
Register
Description
Default
40
30
20
AMBIENT TEMPERATURE
0x6A
0x6B
Remote 1 THERM
Temperature Limit
Local THERM Temperature
Limit
0x64 (100 ° C)
0x64 (100 ° C)
10
0
100
90
0
10 20 30 40 50 60 70 80
TEMPERATURE ABOVE T MIN
VRM TEMP.
90
100
0x6C Remote 2 THERM 0x64 (100 ° C)
Temperature Limit
THERM Hysteresis
THERM hysteresis on a particular channel is configured
via the hysteresis settings in Register 0x6D and
Register 0x6E. For example, setting hysteresis on the
80
Remote 1 channel also sets the hysteresis on Remote 1
70
60
50
40
CPU TEMPERATURE
AMBIENT TEMPERATURE
THERM.
Hysteresis Registers
Register 0x6D, Remote 1 and Local Temperature/T MIN
Hysteresis Register
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
TEMPERATURE ABOVE T MIN
Figure 58. T RANGE and % Fan Speed Slopes for VRM,
Ambient, and CPU Temperature Channels
Step 7: T THERM for Temperature Channels
T THERM is the absolute maximum temperature allowed
on a temperature channel. Above this temperature, a
component such as the CPU or VRM might be operating
beyond its safe operating limit. When the temperature
measured exceeds T THERM , all fans drive at 100% PWM
duty cycle (full speed) to provide critical system cooling.
The fans remain running at 100% until the temperature
drops below T THERM ? hysteresis, where hysteresis is the
Bits <7:4> (HYSR1), Remote 1 Temperature Hysteresis
(4 ° C default)
Bits <3:0> (HYSL), Local Temperature Hysteresis
(4 ° C default)
Register 0x6E, Remote 2 Temperature T MIN Hysteresis
Register
Bits <7:4> (HYSR2), Remote 2 Temperature Hysteresis
(4 ° C default)
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.
http://onsemi.com
37
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