參數(shù)資料
型號: AMD1027
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(jiān)視器
文件頁數(shù): 46/56頁
文件大?。?/td> 1072K
代理商: AMD1027
REV. A
–46–
ADM1027
Table XV. 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 XVI. PWM Configuration Registers
Register Address
0x5C
0x5D
0x5E
R/W
Read/Write
Read/Write
Read/Write
Description
PWM1 Configuration
PWM2 Configuration
PWM3 Configuration
Power-On Default
0x62
0x62
0x62
Bit
<2:0>
(Fan Startup
Timeout)
Name
SPIN
Read/Write
Read/Write
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 will reflect the fan fault. If the
TACH minimum high and low byte contains 0xFFFF or 0x0000, then the Status Register
2 bit will not be set, even if the fan has not started.
000 = No startup timeout
001 = 100 ms
010 = 250 ms (default)
011 = 400 ms
101 = 1 sec
110 = 2 sec
111 = 4 sec
Note: Do not program 100.
<3>
Reserved
Read-Only
Reserved for future use.
<4>
INV
Read/Write
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.
<7:5>
BHVR
Read/Write
These bits assign each fan to a particular temperature sensor for localized cooling.
000 = Remote 1 temperature controls PWMx (automatic fan control mode).
001 = Local temperature controls PWMx (automatic fan control mode).
010 = Remote 2 temperature controls PWMx (automatic fan control mode).
011 = PWMx runs full speed (default).
100 = PWMx disabled.
101 = Fastest speed calculated by local and Remote 2 temperature controls PWMx.
110 = Fastest speed calculated by all three temperatures controls PWMx.
111 = Manual mode. PWM duty cycle registers (Reg. 0x30 to 0x32) become writable.
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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