參數(shù)資料
型號(hào)： ADM1031ARQ
廠商： ON SEMICONDUCTOR
元件分類(lèi)： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT
封裝： MO-137AB, QSOP-16
文件頁(yè)數(shù)： 17/35頁(yè)
文件大?。?/td> 368K
代理商： ADM1031ARQ
ADM1031
Rev. 3 | Page 24 of 35 | www.onsemi.com
PWM DUTY CYCLE SELECT MODE
The ADM1031 can operate under software control by clearing
Bit 7 of Configuration Register 1 (Register 0×00). This allows
the user to directly control PWM duty cycle for each fan.
Clearing Bit 5 and Bit 6 of Configuration Register 1 allows fan
control by varying PWM duty cycle. Values of duty cycle between
0% and 100% can be written to the fan speed configuration
register (0×22) to control the speed of each fan. Table 14 shows
the relationship between hex values written to the fan speed
configuration register and PWM duty cycle obtained.
Table 14. PWM Duty Cycle Select Mode
Hex Value
PWM Duty Cycle
00
0%
01
7%
02
14%
03
20%
04
27%
05
33%
06
40%
07
47%
08
53%
09
60%
0A
67%
0B
73%
0C
80%
0D
87%
0E
93%
0F
100%
Bits <3:0> set the PWM duty cycle for Fan 1; Bits <7:4> set the
PWM duty cycle for Fan 2.
RPM FEEDBACK MODE
The second method of fan speed control under software is RPM
feedback mode. This involves programming the desired fan
RPM value to the device to set fan speed. The advantages
include a very tightly maintained fan RPM over the fan’s life,
and virtually no acoustic pollution due to fan speed variation.
Fans typically have manufacturing tolerances of ±20%, meaning a
wide variation in speed for a typical batch of identical fan models.
If it is required that all fans run at exactly 5000 RPM, it can be
necessary to specify fans with a nominal fan speed of 6250 RPM.
However, many of these fans run too fast and make excess noise.
A fan with nominal speed of 6250 RPM could run as fast as 7000
RPM at 100% PWM duty cycle. RPM mode allows all of these
fans to be programmed to run at the desired RPM value.
Clearing Bit 7 of Configuration Register 1 (Register 0×00) to 0
places the ADM1031 under software control. Once under soft-
ware control, the device can be placed into RPM feedback mode
by writing to Bit 5 and Bit 6 of Configuration Register 1. Writing
a 1 to Bit 5 and Bit 6 selects RPM feedback mode for each fan.
Once RPM feedback mode has been selected, the required fan
RPM can be written to the fan tach high limit registers (0×10,
0×11). The RPM feedback mode function allows a fan RPM
value to be programmed into the device, and the ADM1031
maintains the selected RPM value by monitoring the fan tach
and speeding up the fan as necessary, should the fan start to
slow down. Conversely, should the fan start to speed up due to
aging, the RPM feedback slows the fan down to maintain the
correct RPM speed. The value to be programmed into each fan
tach high limit register is given by:
Count = (f × 60)/R × N
where:
f = 11.25 kHz
R = desired RPM value
N = speed range; must be set to 2
The speed range, N, really determines what the slowest fan speed
measured can be before generating an interrupt. The slowest fan
speed is measured when the count value reaches 255.
Since N = 2
Count = (f × 60)/R × N
R = (f × 60)/Count × N
R = (11250 × 60)/255 × 2
R = (675000)/510
R = 1324 RPM, fan fail detect speed
Programming RPM Values in RPM Feedback Mode
Rather than writing a value such as 5000 to a 16-bit register, an
8-bit count value is programmed instead. The count to be
programmed is given by
Count = (f × 60)/R × N
where:
f = 11.25 kHz
R = desired RPM value
N = speed range = 2
Example 1:
If the desired value for RPM feedback mode is 5000 RPM, the
count to be programmed is
Count = (f × 60)/R × N
Since the desired RPM value, R, is 5000 RPM, the value for
count is:
N = 2:
Count = (11250 × 60)/5000 × 2
Count = 675000/10000
Count = 67 (assumes 2 tach pulses/rev)
相關(guān)PDF資料
PDF描述
ADRF6604ACPZ-R7 2500 MHz - 2900 MHz RF/MICROWAVE DOUBLE BALANCED MIXER
ADRF6801ACPZ-R7 750 MHz - 1150 MHz RF/MICROWAVE I/Q DEMODULATOR
ADT14GS-REEL ANALOG TEMP SENSOR-VOLTAGE, 2.49-2.52V, 3Cel, RECTANGULAR, SURFACE MOUNT
ADT42GRT ANALOG TEMP SENSOR-VOLTAGE, 0.75V, 3Cel, RECTANGULAR, SURFACE MOUNT
ADT50GRT ANALOG TEMP SENSOR-VOLTAGE, 0.1-2V, 3Cel, RECTANGULAR, SURFACE MOUNT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADM1031ARQ-ND 制造商:ON Semiconductor 功能描述:
ADM1031ARQ-REEL 功能描述:IC SENSOR 2-TEMP/FAN CTRL 16QSOP RoHS:否 類(lèi)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(lèi)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(kù) 輸出類(lèi)型:2 線 SMBus? 輸出警報(bào):無(wú) 輸出風(fēng)扇:無(wú) 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類(lèi)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(chēng):296-22675-6
ADM1031ARQ-REEL7 功能描述:IC SENSOR 2-TEMP/FAN CTRL 16QSOP RoHS:否 類(lèi)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(lèi)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(kù) 輸出類(lèi)型:2 線 SMBus? 輸出警報(bào):無(wú) 輸出風(fēng)扇:無(wú) 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類(lèi)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(chēng):296-22675-6
ADM1031ARQZ 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 2 CH TDM PWM FAN CTRL IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
ADM1031ARQZ-R7 功能描述:IC SENSOR 2TEMP/FAN CTRL 16QSOP RoHS:是 類(lèi)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(lèi)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(kù) 輸出類(lèi)型:2 線 SMBus? 輸出警報(bào):無(wú) 輸出風(fēng)扇:無(wú) 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類(lèi)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(chēng):296-22675-6
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*