- 您現在的位置：買賣IC網 > PDF目錄373995 > ADM1026 (Analog Devices, Inc.) Complete Thermal and System Management Controller PDF資料下載
參數資料
| 型號： | ADM1026 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Complete Thermal and System Management Controller |
| 中文描述： | 完整的熱和系統管理控制器 |
| 文件頁數： | 24/56頁 |
| 文件大小： | 634K |
| 代理商： | ADM1026 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁當前第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁
ADM1026
Automatic Fan Speed Control
The ADM1026 offers a simple method of controlling fan speed
according to temperature without intervention from the host
processor. Monitoring must be enabled by setting Bit 0 of
Configuration Register 1 (Address 00h), to enable automatic fan
speed control. Automatic fan speed control can be applied to the
DAC output, the PWM output, or both, by setting Bit 5 and/or
Bit 6 of Configuration Register 1.
Rev. A | Page 24 of 56
The T
MIN
registers (Addresses 10h to 12h) contain minimum
temperature values for the three temperature channels (on-chip
sensor and two remote diodes). This is the temperature at which
a fan starts to operate when the temperature sensed by the
controlling sensor exceeds T
MIN
. T
MIN
can be the same or
different for all three channels. T
MIN
is set by writing a twos
complement temperature value to the T
MIN
registers. If any
sensor channel is not required for automatic fan speed control,
T
MIN
for that channel should be set to 127°C (01111111).
In automatic fan speed control mode, (as shown Figure 42 and
Figure 43) the four MSBs of the DAC control register (Address
04h) and PWM control register (Address 05h) set the minimum
values for the DAC and PWM outputs. Note that, if both DAC
control and PWM control are enabled (Bits 5 and 6 of
Configuration Register 1 = 1), the four MSBs of the DAC
control register (Address 04h) define the minimum fan speed
values for both the DAC and PWM outputs. The value in the
PWM control register (Address 05h) has no effect.
Minimum DAC Code DAC
MIN
= 16 ×
D
256
5
=
Code
Voltage
Output
DAC
×
Minimum PWM Duty Cycle PWMMIN
= 6.67 ×
D
where
D
is the decimal equivalent of Bits 7 to 4 of the register.
When the temperature measured by any of the sensors 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
(
)
20
100
MIN
T
ACTUAL
MIN
MIN
T
PWM
PWM
PWM
×
+
=
or
(
)
20
240
MIN
T
ACTUAL
T
MIN
MIN
DAC
DAC
DAC
×
+
=
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.
PWM
OUTPUT
MIN
TEMPERATURE
T
MIN
SPIN UP FOR 2 SECONDS
100%
T
MIN
– 4°C
T
MIN
+ 20°C
0
Figure 42. Automatic PWM Fan Control Transfer Function
DAC
OUTPUT
MIN
TEMPERATURE
T
MIN
255
T
MIN
– 4°C
T
MIN
+ 20°C
SPIN UP FOR 2 SECONDS
240
0
Figure 43. Automatic DAC Fan Control Transfer Function
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.
相關PDF資料 |
PDF描述 |
|---|---|
| ADM1026JST-REEL | Complete Thermal and System Management Controller |
| ADM1026JSTZ-REEL | Complete Thermal and System Management Controller |
| ADM1026JST | Circular Connector; No. of Contacts:28; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:19; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:19-28 |
| ADM1030ARQ | Intelligent Temperature Monitor and PWM Fan Controller |
| ADM1030 | Circular Connector; No. of Contacts:66; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:19; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:19-35 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ADM1026EBZEVB | 功能描述:BOARD EVAL FOR ADM1026 RoHS:否 類別:編程器，開發系統 >> 過時/停產零件編號 系列:- 標準包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關產品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ADM1026JST | 功能描述:IC CNTRL SYS REF/EEPROM 48LQFP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:1 系列:- 功能:溫度監控系統（傳感器） 傳感器類型:內部和外部 感應溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
| ADM1026JST-REEL | 功能描述:IC CNTRL SYS REF/EEPROM 48LQFP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:1 系列:- 功能:溫度監控系統（傳感器） 傳感器類型:內部和外部 感應溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
| ADM1026JST-REEL7 | 功能描述:IC CNTRL SYS REF/EEPROM 48LQFP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:1 系列:- 功能:溫度監控系統（傳感器） 傳感器類型:內部和外部 感應溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
| ADM1026JSTZ | 功能描述:PMIC 解決方案 HI INT SYS MONITR IC RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
發布緊急采購，3分鐘左右您將得到回復。