參數(shù)資料
型號(hào)： ADT7466ARQZ-REEL7
廠商： ANALOG DEVICES INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： dBCool Remote Thermal Controller and Voltage Monitor
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO16
封裝： LEAD FREE, MO-137AB, QSOP-16
文件頁數(shù)： 28/48頁
文件大?。?/td> 1269K
代理商： ADT7466ARQZ-REEL7
ADT7466
The fan tach limit registers are 16-bit values consisting of 2 bytes.
Table 25. Fan Tach Limit Registers
Register
Description
0x4C
TACH1 minimum low byte
0x4D
TACH1 minimum high byte
0x4E
TACH2 minimum low byte
0x4F
TACH2 minimum high byte
Fan Speed Measurement Rate
The fan tach readings are normally updated once every second.
Rev. 0 | Page 28 of 48
Default
0xFF
0xFF
0xFF
0xFF
The FAST bit (Bit 3) of Configuration Register 3 (0x02) updates
the fan tach readings every 250 ms, when set to 1. If any of the
fans are not being driven by a fan drive output, but are powered
directly from 5 V or 12 V, its 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 two pulses/revolution (and two
pulses/revolution being measured) fan speed is calculated by
Fan Speed
(rpm) = (82000 × 60)/
Fan Tach Reading
where
Fan Tach Reading
is the 16-bit fan tachometer reading.
For example, if
TACH1 High Byte (Reg. 0x49) = 0x17
TACH1 Low Byte (Reg. 0x48) = 0xFF
then fan speed in rpm is
Fan 1 TACH reading = 0x17FF = 6143 decimal
rpm = (82000 × 60)/Fan 1 TACH reading
rpm = (82000 × 60)/6143 = 800 = fan speed
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 is
determined, it can be programmed into the fan pulses per
revolution register (0x39) for each fan. Alternatively, this
register can be used to determine the number of
pulses/revolution output by a given fan. By plotting fan speed
measurements at 100% speed with different pulses/revolution
settings, the smoothest graph with the lowest ripple determines
the correct pulses/revolution value.
Table 26. Fan Pulses Per Revolution Register
Fan
1:0 FAN1
3:2 FAN2
Table 27. Fan Pulses Per Revolution Values
Code
00
01
10
11
The ADT7466 has a unique fan spin-up function. It spins the
fan with the fan start-up voltage until two tach pulses are
detected on the tach input. Once two pulses are detected, the
fan drive goes to the expected running value. The advantage of
this is that fans have different spin-up characteristics and take
different times to overcome inertia. The ADT7466 runs the fans
just fast enough to overcome inertia and is quieter on spin-up
than fans programmed to spin-up for a given spin-up time.
Default
2 pulses per revolution
2 pulses per revolution
Pulses per Revolution
1
2
3
4
FAN START-UP TIMEOUT
To prevent false interrupts being generated as a fan spins up
(since it is below running speed), the ADT7466 includes a fan
start-up timeout function. This is the time limit allowed for two
tach pulses to be detected on spin-up. For example, if a
2-second fan start-up timeout is chosen, and no tach pulses
occur within two seconds of the start of spin-up, a fan fault is
detected and flagged in Interrupt Status Register 1.
Start-Up Timeout Configuration (Reg. 0x38)
Bits 2:0 control the start-up timeout for DRIVE1. Bits 5:3
control the start-up timeout for DRIVE2.
Table 28. Start-Up Timeout Configuration
Code
Timeout
000
No start-up timeout
001
100 ms
010
250 ms
011
400 ms
100
667 ms
101
1 second
110
2 seconds
111
4 seconds
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADT7466ARQZ-RL7 功能描述:板上安裝溫度傳感器 RMT THRM CTR VLT MON RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
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ADT7467 制造商:AD 制造商全稱:Analog Devices 功能描述:dBCool Remote Thermal Monitor and Fan Controller
ADT7467ARQ 功能描述:IC PWM FAN CTRLR W/MONITR 16QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 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(bào):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
ADT7467ARQ-REEL 功能描述:IC REMOTE THERMAL CTRLR 16-QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 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(bào):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
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