參數(shù)資料
型號(hào)： EVAL-ADT7466EB
廠商： Analog Devices, Inc.
英文描述： dBCool Remote Thermal Controller and Voltage Monitor
中文描述： dBCool遠(yuǎn)程熱控制器和電壓監(jiān)視器
文件頁(yè)數(shù)： 28/48頁(yè)
文件大小： 1269K
代理商： EVAL-ADT7466EB
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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參數(shù)描述
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EVAL-ADT7468EB 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:dBCool? Remote Thermal Controller and Voltage Monitor
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