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參數(shù)資料
型號(hào): 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(yuǎn)程熱控制器和風(fēng)扇控制器
文件頁數(shù): 37/48頁
文件大小: 695K
代理商: ADT7460
REV. 0
ADT7460
–37–
Table XVII. Fan Tachometer Limit Registers
Register Address
0x54
0x55
0x56
0x57
0x58
0x59
0x5A
0x5B
R/W
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Description
TACH 1 Minimum Low Byte
TACH 1 Minimum High Byte
TACH 2 Minimum Low Byte
TACH 2 Minimum High Byte
TACH 3 Minimum Low Byte
TACH 3 Minimum High Byte
TACH 4 Minimum Low Byte
TACH 4 Minimum High Byte
Power-On Default
0xFF
0xFF
0xFF
0xFF
0xFF
0xFF
0xFF
0xFF
Exceeding any of the TACH limit registers by 1 indicates that the fan is running too slowly or has stalled. The appropriate status bit will be set in Interrupt Status
Register 2 to indicate the fan failure. Setting the Configuration Register 1 Lock bit has no effect on these registers.
Table XVIII. PWM Configuration Registers
Register Address
0x5C
0x5D
0x5E
Bit
<2:0>
R/W
*
Read/Write
Read/Write
Read/Write
R/W
Read/Write
Description
PWM1 Configuration
PWM2 Configuration
PWM3 Configuration
Description
These bits control the startup timeout for PWMx. The PWM output stays high until
two
valid TACH rising edges are seen from the fan. If there is not a valid TACH signal
during the
fan TACH measurement directly after the Fan Startup Timeout period, then
the TACH
measurement will read 0xFFFF and Status Register 2 reflects the Fan Fault. If
the TACH
Minimum High and Low Byte contains 0xFFFF or 0x0000, then the Status
Register 2 bit will not get set, even if the fan has not started.
000 = No startup timeout
001 = 100 ms
010 = 250 ms (default)
011 = 400 ms
100 = 667 ms
101 = 1 s
110 = 2 s
111 = 4 s
SLOW = 1 makes the Ramp Rates for Acoustic Enhancement four times longer
This bit inverts the PWM output. The default is 0, which corresponds to a logic high
output for 100% duty cycle. Setting this bit to 1 inverts the PWM output, so 100% duty
cycle corresponds to a logic low output.
These bits assign each fan to a particular temperature sensor for localized cooling.
000 = Remote 1 Temp controls PWMx (Automatic Fan Control Mode)
001 = Local Temp controls PWMx (Automatic Fan Control Mode)
010 = Remote 2 Temp controls PWMx (Automatic Fan Control Mode)
011 = PWMx runs full speed (default)
100 = PWMx disabled
111 = Manual Mode. PWM Duty cycle Registers (Reg 0x30–0x32) become writable.
Power-On Default
0x62
0x62
0x62
Name
SPIN
<3>
<4>
SLOW
INV
Read/Write
Read/Write
<7:5>
BHVR
Read/Write
*
These registers become read-only when the Configuration Register 1 Lock bit is set to 1. Any subsequent attempts to write to these registers will fail.
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ADT7460ARQ dB COOL?? Remote Thermal Controller and Fan Controller
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