- 您現(xiàn)在的位置：買賣IC網(wǎng) > Datasheet目錄39 > ADM1027ARQZ-RL7 (ON Semiconductor)IC REMOTE THERMAL CTLR 24QSOP Datasheet資料下載
參數(shù)資料
| 型號： | ADM1027ARQZ-RL7 |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 24/56頁 |
| 文件大?。?/td> | 1822K |
| 描述： | IC REMOTE THERMAL CTLR 24QSOP |
| 產(chǎn)品變化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation Notice 25/Aug/2008 Product Obsolescence 30/Sept/2009 |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 系列： | dBCool® |
| 功能： | 風(fēng)扇控制，溫度監(jiān)控器 |
| 傳感器類型： | 內(nèi)部和外部 |
| 感應(yīng)溫度： | 0°C ~ 105°C，外部傳感器 |
| 精確度： | ±1°C |
| 拓?fù)洌?/td> | ADC，比較器，風(fēng)扇速度計數(shù)器，多路復(fù)用器，寄存器庫 |
| 輸出類型： | SMBus? |
| 輸出警報： | 無 |
| 輸出風(fēng)扇： | 是 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | 0°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)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(dāng)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
REV. A
24
ADM1027
Fan Speed Measurement Registers
The fan tachometer readings are 16-bit values consisting of a
2-byte read from the ADM1027.
Reg. 0x28 TACH1 Low Byte = 0x00 default
Reg. 0x29 TACH1 High Byte = 0x00 default
Reg. 0x2A TACH2 Low Byte = 0x00 default
Reg. 0x2B TACH2 High Byte = 0x00 default
Reg. 0x2C TACH3 Low Byte = 0x00 default
Reg. 0x2D TACH3 High Byte = 0x00 default
Reg. 0x2E TACH4 Low Byte = 0x00 default
Reg. 0x2F TACH4 High Byte = 0x00 default
Reading Fan Speed From the ADM1027
If fan speeds are being measured, this involves a 2-register read
for each measurement. The low byte should be read first. This
causes the high byte to be frozen until both high and low byte
registers have been read from. This prevents erroneous TACH
readings.
The fan tachometer reading registers report back the number of
11.11 s period clocks (90 kHz oscillator) gated to the fan
speed counter, from the rising edge of the first fan TACH pulse
to the rising edge of the third fan TACH pulse (assuming two
pulses per revolution are being counted). Since the device is
essentially measuring the fan TACH period, the higher the
count value, the slower the fan is actually running. A 16-bit fan
tachometer reading of 0xFFFF indicates that the fan either has
stalled or is running very slowly (< 100 RPM).
HIGH LIMIT: > COMPARISON PERFORMED
Since actual fan TACH period is being measured, exceeding a
fan TACH limit by 1 will set the appropriate status bit and can
be used to generate an SMBALERT.
Fan Tach Limit Registers
The fan TACH limit registers are 16-bit values consisting of
two bytes.
Reg. 0x54 TACH1 Minimum Low Byte = 0xFF default
Reg. 0x55 TACH1 Minimum High Byte = 0xFF default
Reg. 0x56 TACH2 Minimum Low Byte = 0xFF default
Reg. 0x57 TACH2 Minimum High Byte = 0xFF default
Reg. 0x58 TACH3 Minimum Low Byte = 0xFF default
Reg. 0x59 TACH3 Minimum High Byte = 0xFF default
Reg. 0x5A TACH4 Minimum Low Byte = 0xFF default
Reg. 0x5B TACH4 Minimum High Byte = 0xFF default
Fan Speed Measurement Rate
The fan TACH readings are normally updated once every second.
The fast bit (Bit 3) of Configuration Register 3 (Reg. 0x78),
when set, updates the fan TACH readings every 250 ms.
If any of the fans are not being driven by a PWM channel but
are powered directly from 5 V or 12 V, their associated dc bit in
Configuration Register 3 should be set. This allows TACH
readings to be taken on a continuous basis for fans connected
directly to a dc source.
Calculating Fan Speed
Assuming a fan with 2 pulses/revolution (and 2 pulses/rev being
measured), fan speed is calculated by:
Fan Speed RPM
Fan Tach Reading
(
)
=
?/DIV>
(
)
90 000 60
,
where Fan Tach Reading = 16-bit fan tachometer reading.
Example:
TACH1 high byte (Reg. 0x29) = 0x17
TACH1 low byte (Reg. 0x28) = 0xFF
What is Fan 1 speed in RPM?
Fan 1 TACH reading = 0x17FF = 6143 decimal
RPM = (f ?60)/fan 1 TACH reading
RPM = (90000 ?60)/6143
Fan Speed = 879 RPM
FAN PULSES PER REVOLUTION
Different fan models can output either 1, 2, 3, or 4 TACH
pulses per revolution. Once the number of fan TACH pulses
has been determined, it can be programmed into the fan pulses
per revolution register (Reg. 0x7B) for each fan. Alternatively,
this register can be used to determine the number or pulses/
revolution output by a given fan. By plotting fan speed measure-
ments at 100% speed with different pulses/rev setting, the
smoothest graph with the lowest ripple determines the correct
pulses/rev value.
Fan Pulses Per Revolution Register
<1:0> FAN1 default = 2 pulses/rev
<3:2> FAN2 default = 2 pulses/rev
<5:4> FAN3 default = 2 pulses/rev
<7:6> FAN4 default = 2 pulses/rev
00 = 1 pulse/rev
01 = 2 pulses/rev
10 = 3 pulses/rev
11 = 4 pulses/rev
Rev. 3 | Page 24 of 56 | www.onsemi.com
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADM1029ARQZ-R7 | IC SENSOR 2TEMP/FAN CTRL 24QSOP |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADM1027ARQZ-RL71 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:dBCOOLa?￠ Remote Thermal Controller and Voltage Monitor |
| ADM1028 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Remote Thermal Diode Monitor with Linear Fan Control |
| ADM1028ARQ | 功能描述:IC SENSOR TEMP/FAN CTRL 16QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)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(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風(fēng)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(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
| ADM1028ARQ-REEL7 | 制造商:Rochester Electronics LLC 功能描述:TDM + LINEAR FAN CONTROL I.C. - Tape and Reel |
| ADM1029 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual PWM Fan Controller and Temperature Monitor for High Availability Systems |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。