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| 型号： | ADT7490ARQZ-REEL |
| 厂商： | ON Semiconductor |
| 文件页数： | 35/75页 |
| 文件大小： | 0K |
| 描述： | IC THERM MON FAN CTLR 24QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi QSOP 24ld Pkg (MSL) Change 17/Jun/2010 |
| 标准包装： | 2,500 |
| 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) |
| 其它名称： | ADT7490ARQZ-REEL-ND ADT7490ARQZ-REELOSTR |
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ADT7490
bridge between temperature measurement channels and the
three PWM outputs.
Bits [7:5] (BHVR) of Register 0x5C, Register 0x5D, and
Register 0x5E (PWM configuration registers) control the
behavior of the fans connected to the PWM1, PWM2, and
PWM3 outputs, respectively. The values selected for these
bits determine how the multiplexer connects a temperature
measurement channel to a PWM output.
Automatic Fan Control Multiplexer Options
Bits [7:5] (BHVR) , Register 0x5C, Register 0x5D, and
Register 0x5E, with the ALT bit (Bit 3) cleared to 0.
000 = Remote 1 temperature controls PWMx
001 = Local temperature controls PWMx
010 = Remote 2 temperature controls PWMx
101 = Fastest speed calculated by local and Remote 2
temperature controls PWMx
110 = Fastest speed calculated by all three temperature
channels controls PWMx
The fastest speed calculated options pertain to controlling
one PWM output based on multiple temperature channels.
The thermal characteristics of the three temperature zones
can be set to drive a single fan. An example is the fan turning
on when the Remote 1 temperature exceeds 60 ? C or if
the local temperature exceeds 45 ? C.
Setting the ALT bit in Register 0x5C, Register 0x5D, and
Register 0x5E gives alternative behavior settings for
Bits [7:5] of the PWM configuration registers.
Bits [7:5] (BHVR), Register 0x5C, Register 0x5D, and
Register 0x5E, with the ALT bit (Bit 3) set to 1.
100 = PWMx runs at 100% duty cycle
110 = PWMx runs at 100% duty cycle
Step 3: T MIN Settings for Thermal Calibration Channels
T MIN is the temperature at which the fans start to turn on
under automatic fan control. The speed at which the fan runs
at T MIN is programmed later. The T MIN values chosen are
temperature channel specific, for example, 25 ? C for
ambient channel, 30 ? C for VRM temperature, and 40 ? C for
processor temperature.
T MIN is an 8-bit value, either twos complement or Offset
64, that can be programmed in 1 ? C increments. A T MIN
register is associated with each temperature measurement
channel: Remote 1, local, Remote 2 and PECI temperature.
When the T MIN value is exceeded, the fan turns on and runs
at the minimum PWM duty cycle. The fan turns off once the
temperature has dropped below T MIN ? T HYST .
To overcome fan inertia, the fan is spun up until two valid
TACH rising edges are counted. See the Fan Startup
Timeout section for more details. In some cases, primarily
for psycho-acoustic reasons, it is desirable that the fan never
switch off below T MIN . When set, Bits [7:5] of Enhanced
Acoustics Register 1 (0x62) keep the fans running at the
PWM minimum duty cycle if the temperature should fall
below T MIN .
Table 39. T MIN REGISTERS
Register Description Default
0x67 Remote 1 Temperature T MIN 0x5A (90 ? C)
0x68 Local Temperature T MIN 0x5A (90 ? C)
000 = PECI0 reading controls PWMx
001 = PECI1 reading controls PWMx
0x69
0x3B
Remote 2 Temperature T MIN
PECI T MIN
0x5A (90 ? C)
0xE0 ( ? 32 ? C)
010 = PECI2 reading controls PWMx
011 = PECI3 reading controls PWMx
101 = Fastest speed calculated by all four PECI
readings controls PWMx
111 = Fastest speed calculated by all thermal zones
(Local, Rem1, Rem2 and PECI) controls PWMx
Other Mux Options
Bits [7:5] (BHVR), Register 0x5C, Register 0x5D, and
Register 0x5E, with the ALT bit (Bit 3) cleared to 0.
011 = PWMx runs full speed
100 = PWMx disabled (default)
111 = Manual mode. PWMx is running under software
control. In this mode, PWM duty cycle registers
(Register 0x30 to Register 0x32) are writable and
control the PWM outputs.
Enhanced Acoustics Register 1 (Register 0x62)
Bit 7 (MIN3) = 0, PWM3 is off (0% PWM duty cycle) when
the temperature is below T MIN – T HYST .
Bit 7 (MIN3) = 1, PWM3 runs at PWM3 minimum duty
cycle below T MIN – T HYST .
Bit 6 (MIN2) = 0, PWM2 is off (0% PWM duty cycle) when
the temperature is below T MIN – T HYST .
Bit 6 (MIN2) = 1, PWM2 runs at PWM2 minimum duty
cycle below T MIN – T HYST .
Bit 5 (MIN1) = 0, PWM1 is off (0% PWM duty cycle) when
the temperature is below T MIN – T HYST .
Bit 5 (MIN1) = 1, PWM1 runs at PWM1 minimum duty
cycle below T MIN – T HYST .
Bits [7:5] (BHVR), Register 0x5C, Register 0x5D, and
Register 0x5E, with the ALT bit (Bit 3) set to 1.
http://onsemi.com
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