參數(shù)資料
型號: ADT7460
廠商: Analog Devices, Inc.
英文描述: dB COOL?? Remote Thermal Controller and Fan Controller
中文描述: 分貝很酷吧??遠程熱控制器和風扇控制器
文件頁數(shù): 31/48頁
文件大?。?/td> 695K
代理商: ADT7460
REV. 0
ADT7460
–31–
Table V. Voltage Reading Registers (Power-On Default = 0x00)
Register Address
0x20
0x22
R/W
Read Only
Read Only
Description
2.5 V Reading (8 MSBs of reading)
V
CC
Reading: measures V
CC
through the V
CC
pin (8 MSBs of reading)
These voltage readings are in twos complement format.
If the extended resolution bits of these readings are also being read, the Extended Resolution registers (Reg. 0x76, 0x77) should be read first. Once the Extended
Resolution registers get read, the associated MSB reading registers get frozen until read. Both the Extended Resolution Registers and the MSB registers get frozen.
Table VI. Temperature Reading Registers (Power-On Default = 0x80)
Register Address
0x25
0x26
0x27
R/W
Read Only
Read Only
Read Only
Description
Remote 1 Temperature Reading
*
(8 MSBs of reading)
Local Temperature Reading (8 MSBs of reading)
Remote 2 Temperature Reading
*
(8 MSBs of reading)
These temperature readings are in twos complement format.
*Note that a reading of 0x80 in a temperature reading register indicates a diode fault (open or short) on that channel. If the extended resolution bits of these readings are
also being read, the Extended Resolution registers (Reg. 0x76, 0x77) should be read first. Once the Extended Resolution registers get read, all associated MSB reading
registers get frozen until read. Both the Extended Resolution Registers and the MSB registers get frozen.
Table VII. Fan Tachometer Reading Registers (Power-On Default = 0x00)
Register Address
0x28
0x29
0x2A
0x2B
0x2C
0x2D
0x2E
0x2F
R/W
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Description
TACH1 Low Byte
TACH1 High Byte
TACH2 Low Byte
TACH2 High Byte
TACH3 Low Byte
TACH3 High Byte
TACH4 Low Byte
TACH4 High Byte
These registers count the number of 11.11
μ
s periods (based on an internal 90 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 using the Fan Pulses Per Revolution Register (Reg. 0x7B). This allows the fan speed to be accurately
measured. Since a valid Fan Tachometer reading requires that two bytes are 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 in to these registers. This prevents false interrupts
from occurring while the fans are spinning up.
A count of 0xFFFF indicates that a fan is:
1. Stalled or Blocked
(object jamming the fan)
2. Failed
(internal circuitry destroyed)
3. Not Populated
(The ADT7460 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.)
4. Alternate Function
, e.g., TACH4 reconfigured as
THERM
pin
5. 2-Wire Instead of 3-Wire Fan
相關PDF資料
PDF描述
ADT7460ARQ dB COOL?? Remote Thermal Controller and Fan Controller
ADT7461 【1∑C Temperature Monitor with Series Resistance Cancellation
ADT7461AR 【1∑C Temperature Monitor with Series Resistance Cancellation
ADT7461AR-REEL 【1∑C Temperature Monitor with Series Resistance Cancellation
ADT7461AR-REEL7 【1∑C Temperature Monitor with Series Resistance Cancellation
相關代理商/技術參數(shù)
參數(shù)描述
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