- 您現(xiàn)在的位置：買賣IC網(wǎng) > Datasheet目錄39 > ADM1029ARQZ-R7 (ON Semiconductor)IC SENSOR 2TEMP/FAN CTRL 24QSOP Datasheet資料下載
參數(shù)資料
| 型號： | ADM1029ARQZ-R7 |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 15/50頁 |
| 文件大?。?/td> | 402K |
| 描述： | IC SENSOR 2TEMP/FAN CTRL 24QSOP |
| 產品變化通告： | QSOP 24ld Pkg (MSL) Change 17/Jun/2010 |
| 標準包裝： | 1,000 |
| 功能： | 風扇控制，溫度監(jiān)控器 |
| 傳感器類型： | 內部和外部 |
| 感應溫度： | 0°C ~ 100°C，外部傳感器 |
| 精確度： | ±1°C 本地，±3°C 遠程 |
| 拓撲： | ADC，風扇控制，寄存器庫 |
| 輸出類型： | 開路漏極 |
| 輸出警報： | 是 |
| 輸出風扇： | 是 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | 0°C ~ 100°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SSOP（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 24-QSOP |
| 包裝： | 帶卷 (TR) |
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頁當前第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
ADM1029
http://onsemi.com
15
Fan Speed Limits
Fans generally do not overspeed if run from the correct
voltage, so the failure condition of interest is under-speed
due to electrical or mechanical failure. For this reason only
low-speed limits are programmed into the Tach Limit
Registers for the fans. These registers are at address 78h for
Fan 1 and 79h for Fan 2. It should be noted that, since fan
period rather than speed is being measured, the fan speed
count will be larger the slower the fan speed. Therefore a fan
failure fault will occur when the measurement exceeds the
limit value.
For the most accurate fan failure indication, the oscillator
frequency should be chosen to give as large a limit value as
possible without the counter overranging. A count close to
?full-scale or 191 is the optimum value.
For example, if a fan produces two tach pulses per
revolution and the fan failure speed is to be 600 rpm, the
oscillator frequency should be set to 940 Hz. This will give
a count at the fail speed of:
(eq. 3)
940 4 606002 + 188
If the oscillator frequency were only 470 Hz, the count
would be 94, while an oscillator frequency of 1880 Hz
cannot be used because the count would be 376 and the
counter would overrange.
Fan Monitoring Cycle Time
Five complete tach periods are required to carry out a fan
speed measurement Therefore, if the start of a fan
measurement just misses a rising edge, the measurement can
take almost six tach periods for each fan.
The worst-case monitoring cycle time is when both fans
are under speed and the fan speed counter counts up to its
maximum value. The actual count takes 256 oscillator
pulses over four tach periods, plus a further two tach periods
or 128 oscillator pulses before the count starts. The total
monitoring cycle time is therefore:
(eq. 4)
t
MEAS
+ 384f
OSC(FAN 1)
) 384f
OSC(FAN 2)
In order to read a valid result from the Fan Tach Value
Registers, the total monitoring time allowed after starting
the monitoring cycle should be greater than this.
Tach Signal Conditioning
Signal conditioning in the ADM1029 accommodates the
slow rise and fall times typical of fan tachometer outputs.
The maximum input signal range is 0 V to 5 V, even if V
CC
is less than 5 V. In the event that these inputs are supplied
from fan outputs that exceed 0 V to 5 V, either resistive
attenuation of the fan signal or diode clamping must be
included to keep inputs within an acceptable range.
Figures 25 a to 28 show circuits for most common fan tach
outputs.
If the fan tach output has a resistive pull-up to V
CC
, it can
be connected directly to the fan input, as shown in Figure 25.
Figure 25. Fan with Tach Pull-up to +V
CC
12 V
V
CC
FAN SPEED
COUNTER
TACH
OUTPUT
TACH1
OR TACH 2
PULL-UP
4.7 kW
TYP
If the fan output has a resistive pull-up to 12 V (or other
voltage greater than 6.5 V), the fan output can be clamped
with a Zener diode, as shown in Figure 26. The Zener
voltage should be chosen so that it is greater than V
IH
but less
than 6.5 V, allowing for the voltage tolerance of the Zener.
A value of between 3 V and 5 V is suitable.
Figure 26. Fan with Tach. Pull-up to Voltage > 6.5 V
(e.g., 12 V) Clamped with Zener Diode
12 V
V
CC
FAN SPEED
COUNTER
TACH
OUTPUT
TACH1
OR
TACH 2
PULL-UP
4.7 kW
TYP
ZD1*
ZENER
* Choose ZD1 Voltage Approx. 0.8 ?V
CC
If the fan has a strong pull-up (less than 1 kW) to 12 V, or
a totem-pole output, a series resistor can be added to limit the
Zener current, as shown in Figure 27. Alternatively, a
resistive attenuator may be used, as shown in Figure 28.
R1 and R2 should be chosen such that:
(eq. 5)
2 V t V
PULLUP
R2(R
PULLUP
) R1 ) R2) t 5 V
The fan inputs have an input resistance of nominally
160 kW to ground, so this should be taken into account when
calculating resistor values.
With a pull-up voltage of 12 V and pull-up resistor less
than 1 kW, suitable values for R1 and R2 would be 100 kW
and 47 kW. This will give a high input voltage of 3.83 V.
相關PDF資料 |
PDF描述 |
|---|---|
| ADM1030ARQZ-RL7 | IC SNSR TEMP/FAN PWM CTRL 16QSOP |
| ADM1032ARZ-REEL | IC TEMP MONITOR 85DEG 8SOIC |
| ADM1033ARQZ-RL7 | IC THERM/FAN SPEED CTLR 16-QSOP |
| ADM1034ARQZ-REEL | IC THERM/FAN SPEED CTRLR 16-QSOP |
| ADN8810ACPZ-REEL7 | IC CURRENT SOURCE(12BIT) 24LFCSP |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADM1030 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Intelligent Temperature Monitor and PWM Fan Controller |
| ADM1030ARQ | 功能描述:IC SNSR TEMP/FAN PWM CTRL 16QSOP 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(jiān)控系統(tǒng)（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 |
| ADM1030ARQ-REEL | 功能描述:IC SNSR TEMP/FAN PWM CTRL 16QSOP 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(jiān)控系統(tǒng)（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 |
| ADM1030ARQ-REEL7 | 功能描述:IC SNSR TEMP/FAN PWM CTRL 16QSOP 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(jiān)控系統(tǒng)（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 |
| ADM1030ARQZ | 功能描述:馬達/運動/點火控制器和驅動器 TDM & PWM FAN CNTRLRS IC RoHS:否 制造商:STMicroelectronics 產品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復。