參數(shù)資料
型號(hào): ADT7470ARQZ
廠商: ANALOG DEVICES INC
元件分類: 溫度/濕度傳感器
英文描述: DIGITAL TEMP SENSOR-SERIAL, 7BIT(s), RECTANGULAR, SURFACE MOUNT
封裝: ROHS COMPLIANT, MO-137AB, QSOP-16
文件頁數(shù): 17/40頁
文件大?。?/td> 962K
代理商: ADT7470ARQZ
ADT7470
Rev. C | Page 24 of 4
0
Calculating Fan Speed
Assuming that the measured number of tach pulses per rotation
corresponds to the number of pulses counted as set in register
0x43, fan speed is calculated by
Fan Speed (RPM) = (90,000 × 60)/Fan Tach Reading
where Fan Tach Reading is the 16-bit fan tachometer reading.
For example:
Tach 1 High Byte (Reg 0x2B) = 0x17
Tach 1 Low Byte (Reg 0x2A) = 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. The number of tach pulses per rotation for each
fan should be programmed into the fan pulses per revolution
register (Register 0x43). If an incorrect value is programmed,
then the fan speed cannot be determined using the equation in
Alternatively, if the number of tach pulses per rotation is not
know, this register can be used in determining the number
of pulses/revolution output by a given fan. By plotting fan
speed measurements at maximum speed with different pulses/
revolution settings, the smoothest graph with the lowest ripple
determines the correct pulses/revolution value.
相關(guān)PDF資料
PDF描述
ADT7473ARQZ-1REEL7 DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT
ADT7473ARQZ-1REEL DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT
ADT7476ARQZ-REEL7 DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT
ADT7482ARMZ-RL DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 2.5Cel, SQUARE, SURFACE MOUNT
ADT7482ARMZ-U2 DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 2.5Cel, SQUARE, SURFACE MOUNT
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