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參數(shù)資料
| 型號(hào)： | ADM1031ARQ |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 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 |
| 文件頁數(shù)： | 18/35頁 |
| 文件大?。?/td> | 368K |
| 代理商： | ADM1031ARQ |
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ADM1031
Rev. 3 | Page 25 of 35 | www.onsemi.com
Example 2:
If the desired value for RPM feedback mode is 3650 RPM, the
count to be programmed is
Count = (f × 60)/R × N
Since the desired RPM value, R, is 3650 RPM, the value for
count is:
N = 2:
Count = (11250 × 60)/3650 × 2
Count = 675000/7300
Count = 92 (assumes 2 tach pulses/rev)
Once the count value has been calculated, it should be written
to the fan tach high limit register. It should be noted that in
RPM feedback mode, there is no high limit register for
underspeed detection that can be programmed as there are in
the other fan speed control modes. The only time each fan
indicates a fan failure condition is whenever the count reaches
255. Since the speed range N = 2, the fan fails if its speed drops
below 1324 RPM.
Programming RPM Values
1.
Choose the RPM value to be programmed.
2.
Set speed range value N = 2.
3.
Calculate count value based on RPM and speed range
values chosen. Use the count equation to calculate the
count value.
4.
Clear Bit 7 of Configuration Register 1 (Register 0×00) to
place the ADM1031 under software control.
5.
Write a 1 to Bit 5 of Configuration Register 1 to place the
device in RPM feedback mode.
6.
Write the calculated count value to the fan tach high limit
register (Register 0×10). The fan speed now goes to the
desired RPM value and maintains that fan speed.
RPM Feedback Mode Limitations
RPM feedback mode only controls fan RPM over a limited fan
speed range of about 75% to 100%. However, this should be
enough range to overcome fan-manufacturing tolerance. In
practice, however, the program must not function at too low an
RPM value for the fan to run at, or the RPM mode does not
operate.
To find the lowest RPM value allowed for a given fan, do the
following:
1.
Run the fan at 53% PWM duty cycle in software mode.
Clear Bit 5 and Bit 7 of Configuration Register 1 (Register
0×00) to enter PWM duty cycle mode. Write 0×08 to the
fan speed configuration register (Register 0×22) to set the
PWM output to 53% duty cycle.
2.
Measure the fan RPM. This represents the fan RPM below
which the RPM mode fails to operate. Do not program a
lower RPM than this value when using RPM feedback
mode.
3.
Ensure that speed range N = 2 when using RPM feedback
mode.
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| 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(kù) 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 |
| ADM1031ARQ-REEL7 | 功能描述:IC SENSOR 2-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(kù) 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 |
| 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(kù) 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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