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| 型号： | ADM1026JST-REEL |
| 厂商： | ON Semiconductor |
| 文件页数： | 23/55页 |
| 文件大小： | 0K |
| 描述： | IC CNTRL SYS REF/EEPROM 48LQFP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Obsolescence 30/Sept/2009 |
| 标准包装： | 2,000 |
| 功能： | 硬件监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | 0°C ~ 100°C |
| 精确度： | ±3°C（最小值） |
| 拓扑： | ADC，比较器，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 ~ 5.5 V |
| 工作温度： | 0°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 带卷 (TR) |
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ADM1026
When the temperature measured by any of the sensors
SPIN UP FOR 2 SECONDS
exceeds the corresponding T MIN , the fan is spun up for
2 seconds with the fan drive set to maximum (full scale from
the DAC or 100% PWM duty cycle). The fan speed is then
set to the minimum as previously defined. As the
temperature increases, the fan drive increases until the
temperature reaches T MIN + 20 ? C.
The fan drive at any temperature up to 20 ? C above T MIN
is given by:
T ACTUAL * T MIN
PWM + PWM MIN ) 100 * PWM MIN
20
255
DAC
OUTPUT
MIN
240
or
(eq. 13)
T MIN - 4 5 C
T MIN
TEMPERATURE
T MIN + 20 5 C
DAC + DAC MIN ) 240 * DAC MIN
T ACTUAL * T MIN
20
Figure 42. Automatic DAC Fan Control Transfer
Function
(eq. 14)
For simplicity of the automatic fan speed algorithm, the
DAC code increases linearly up to 240, not its full scale of
255. However, when the temperature exceeds T MIN +20 ? C,
the DAC output jumps to full scale. To ensure that the
maximum cooling capacity is always available, the fan drive
is always set by the sensor channel demanding the highest
fan speed.
If the temperature falls, the fan does not turn off until the
temperature measured by all three temperature sensors has
fallen to their corresponding T MIN ? 4 ? C. This prevents the
fan from cycling on and off continuously when the
temperature is close to T MIN .
Whenever a fan starts or stops during automatic fan speed
control, a one-off interrupt is generated at the INT output.
This is described in more detail in the section on the
ADM1026 Interrupt Structure.
SPIN UP FOR 2 SECONDS
100%
Fan Inputs
Pins 3 to 6 and 9 to 12 may be configured as fan speed
measuring inputs by clearing the corresponding bit(s) of
Configuration Register 2 (Address 01h), or as
general-purpose logic inputs/outputs by setting bits in this
register. The power-on default value for this register is 00h,
which means all the inputs are set for fan speed
measurement.
Signal conditioning in the ADM1026 accommodates the
slow rise and fall times typical of fan tachometer outputs.
The fan tach inputs have internal 10 k W pullup resistors to
3.3 V STBY. In the event that these inputs are supplied from
fan outputs that exceed the supply, either resistive
attenuation of the fan signal or diode clamping must be
included to keep inputs within an acceptable range.
Figure 43 through Figure 47 show circuits for common fan
tach outputs.
If the fan tach output is open-drain or has a resistive pullup
to V CC , then it can be connected directly to the fan input, as
shown in Figure 44.
12 V
V CC
PWM
OUTPUT
PULLUP
4.7k ?
TYP
FAN(0–7)
FAN SPEED
COUNTER
MIN
Figure 43. Fan with Tach Pullup to +V CC
T MIN ? 4 5 C T MIN T MIN + 20 5 C
TEMPERATURE
Figure 41. Automatic PWM Fan Control Transfer
Function
If the fan output has a resistive pullup to +12 V (or other
voltage greater than 3.3 V STBY), the fan output can be
clamped with a Zener diode, as shown in Figure 46. The
Zener voltage should be chosen so that it is greater than V IH
but less than 3.3 V STBY, allowing for the voltage tolerance
of the Zener.
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| ADM1026JST-REEL7 | 功能描述:IC CNTRL SYS REF/EEPROM 48LQFP RoHS:否 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:1 系列:- 功能:温度监控系统（传感器） 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:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADM1026JSTZ | 功能描述:PMIC 解决方案 HI INT SYS MONITR IC RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| ADM1026JSTZ-R7 | 功能描述:PMIC 解决方案 HI INT SYS MONITR IC RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| ADM1026JSTZ-REEL | 功能描述:板上安装温度传感器 HI INT SYS MONITR IC RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| ADM1026JSTZ-REEL7 | 制造商:Analog Devices 功能描述:IC SYSTEM MONITOR 制造商:ON Semiconductor 功能描述:IC SYSTEM MONITOR |
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