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参数资料
| 型号： | ADM1031ARQZ-REEL |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT |
| 封装： | LEAD FREE, MO-137AB, QSOP-16 |
| 文件页数： | 16/36页 |
| 文件大小： | 596K |
| 代理商： | ADM1031ARQZ-REEL |
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ADM1031
Rev. B | Page 23 of 36
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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