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參數資料
| 型號： | ADT7466 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | dBCool Remote Thermal Controller and Voltage Monitor |
| 中文描述： | dBCool遠程熱控制器和電壓監視器 |
| 文件頁數： | 46/48頁 |
| 文件大?。?/td> | 1269K |
| 代理商： | ADT7466 |
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ADT7466
Fan Tachometer Reading
These registers count the number of 12.43 μs periods (based on a local 82 kHz clock) that occur between a number of consecutive fan
tach pulses (default = 2). The number of tach pulses used to count can be changed by using the fan pulses per revolution register (0x39).
This allows the fan speed to be accurately measured. Since a valid fan tachometer reading requires two bytes to be read, the low byte must
be read first. Both the low and high bytes are then frozen until read. At power-on, these registers contain 0x0000 until such time as the
first valid fan tach measurement is read into these registers. This prevents false interrupts from occurring while the fans are spinning up.
Rev. 0 | Page 46 of 48
A count of 0xFFFF indicates that a fan is
Stalled or blocked (object jamming the fan).
Failed (internal circuitry destroyed).
Not populated (the ADT7466 expects to see a fan connected to each tach. If a fan is not connected to that tach, its tach minimum
high and low byte should be set to 0xFFFF).
2-wire instead of 3-wire.
Table 70. Fan Tachometer Reading Registers (Power-On Default = 0xFF)
Register Address
Read/Write
Description
0x48
Read only
TACH1 low byte
0x49
Read only
TACH1 high byte
0x4A
Read only
TACH2 low byte
0x4B
Read only
TACH2 high byte
Fan Tachometer Limit
Exceeding any of the tach limit registers by 1 indicates that the fan is running too slowly or has stalled. The appropriate status bit is set in
Interrupt Status Register 1 to indicate the fan failure. Setting the Configuration Register 1 lock bit has no effect on these registers.
Table 71. Fan Tachometer Limit Registers (Power-On Default = 0xFF)
Register Address
Read/Write
Description
0x4C
Read/Write
TACH 1 minimum low byte
0x4D
Read/Write
TACH 1 minimum high byte
0x4E
Read/Write
TACH 2 minimum low byte
0x4F
Read/Write
TACH 2 minimum high byte
Manufacturer’s Test
These registers are for manufacturer’s use only and should not be read or written to in normal use.
These registers become read only when the Configuration Register 1 lock bit is set to 1. Additional attempts to write to these register have
no effect.
Table 72. Register 0x3F—Manufacturers Test Registers (Power-On Default = 0x00)
Register Address
Read/Write
Description
0x50
Read/Write
Manufacturer’s Test Register 1
0x51
Read/Write
Manufacturer’s Test Register 2
0x52
Read/Write
Manufacturer’s Test Register 3
0x53
Read/Write
Manufacturer’s Test Register 4
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