參數資料
型號： ADT7463ARQZ-REEL
廠商： ON Semiconductor
文件頁數： 30/50頁
文件大?。?/td> 726K
描述： IC REMOTE THERMAL CTRLR 24-QSOP
產品變化通告： MFG CHG Notification ADI to ON Semi
QSOP 24ld Pkg (MSL) Change 17/Jun/2010
標準包裝： 2,500
系列： dBCool®
功能： 風扇控制，溫度監(jiān)控器
傳感器類型： 內部和外部
感應溫度： -40°C ~ 120°C，外部傳感器
精確度： ±1.5°C（最小值）
拓撲： ADC，比較器，風扇速度計數器，多路復用器，寄存器庫
輸出類型： SMBus?
輸出警報： 無
輸出風扇： 是
電源電壓： 3 V ~ 5.5 V
工作溫度： -40°C ~ 120°C
安裝類型： 表面貼裝
封裝/外殼： 24-SSOP（0.154"，3.90mm 寬）
供應商設備封裝： 24-QSOP
包裝： 帶卷 (TR)
ADT7463
http://onsemi.com
30
The fan tachometer readings are 16bit values consisting
of a 2byte read from the ADT7463.
Table 34. FAN SPEED MEASUREMENT REGISTERS
Register
Description
Default
0x28
TACH1 Low Byte
0x00
0x29
TACH1 High Byte
0x00
0x2A
TACH2 Low Byte
0x00
0x2B
TACH2 High Byte
0x00
0x2C
TACH3 Low Byte
0x00
0x2D
TACH3 High Byte
0x00
0x2E
TACH4 Low Byte
0x00
0x2F
TACH4 High Byte
0x00
Reading Fan Speed from the ADT7463
If fan speeds are being measured, this involves a
2register read for each measurement. The low byte should
be read first. This causes the high byte to be frozen until both
high and low byte registers have been read from. This
prevents erroneous TACH readings.
The fan tachometer reading registers report back the
number of 11.11 ms period clocks (90 kHz oscillator) gated
to the fan speed counter, from the rising edge of the first fan
TACH pulse to the rising edge of the third fan TACH pulse
(assuming two pulses per revolution are being counted).
Since the device is essentially measuring the fan TACH
period, the higher the count value the slower the fan is
actually running. A 16bit fan tachometer reading of
0xFFFF indicates either that the fan has stalled or is running
very slowly (< 100 RPM).
HighLimit :u ComparisonPerformed
Since the actual fan TACH period is being measured,
exceeding a fan TACH limit by 1 sets the appropriate status
bit and can be used to generate an SMBALERT
.
The fan TACH limit registers are 16bit values consisting
of two bytes.
Table 35. FAN TACH LIMIT REGISTERS
Register
Description
Default
0x54
TACH1 Minimum Low Byte
0xFF
0x55
TACH1 Minimum High Byte
0xFF
0x56
TACH2 Minimum Low Byte
0xFF
0x57
TACH2 Minimum High Byte
0xFF
0x58
TACH3 Minimum Low Byte
0xFF
0x59
TACH3 Minimum High Byte
0xFF
0x5A
TACH4 Minimum Low Byte
0xFF
0x5B
TACH4 Minimum High Byte
0xFF
Fan Speed Measurement Rate
The fan TACH readings are normally updated once every
second.
The FAST bit (Bit 3) of Configuration Register 3
(Reg. 0x78), when set, updates the fan TACH readings every
250 ms.
If any of the fans are not being driven by a PWM channel
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 a two pulses/revolution (and two
pulses/revolution being measured), fan speed is calculated
by:
Fan Speed (RPM) + (90,000 60)Fan TACH Reading
where:
Fan TACH Reading = 16bit Fan Tachometer Reading
Example:
TACH1 HIGH Byte (Reg. 0x29) + 0x17
TACH1 LOW Byte (Reg. 0x28) + 0xFF
What is Fan 1 speed in RPM?
Fan 1 TACH Reading + 0x17FF + 6143 Decimal
RPM + (f 60)Fan 1 TACH Reading
RPM + (90, 000 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. Once the number of fan Tach pulses
has been determined, it is programmed into the fan pulses
per   revolution   register   (Reg. 0x7B)   for   each   fan.
Alternatively, this register can be used to determine the
number or pulses/revolution output by a given fan. By
plotting fan speed measurements at 100% speed with
different pulses/revolution setting, the smoothest graph with
the lowest ripple determines the correct pulses/revolution
value.
Table 36. FAN PULSES PER REVOLUTION REGISTER
(REG. 0X7B)
Bit
Mnemonic
Description
<1:0>
FAN1 Default
2 Pulses per Revolution
<3:2>
FAN2 Default
2 Pulses per Revolution
<5:4>
FAN3 Default
2 Pulses per Revolution
<7:6>
FAN4 Default
2 Pulses per Revolution
Table 37. FAN PULSES PER REVOLUTION
REGISTER BIT VALUES
Value
Description
00
1 Pulse per Revolution
01
2 Pulses per Revolution
10
3 Pulses per Revolution
11
4 Pulses per Revolution
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