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Temperature Monitors and
PWM Fan Controllers
18   ______________________________________________________________________________________
Addr(H)    READ/WRITE   POR STATE
DESCRIPTION
20
R/W
0101 1101
Fan characteristics register:
Bits [7:6]: N factor:
  These bits contain the N factor for the fan-speed range:
  00 = 1 (fail speed =2647RPM)
  01 = 2 (fail speed =1324RPM) (default)
  10 = 4 (fail speed = 662RPM)
  11 = 8 (fail speed = 331RPM)
Bits [5:3]: PWM frequency:
  These bits contain the nominal PWM output frequency:
  000 = 11.7Hz
  001 = 15.6Hz
  010 = 23.4Hz
  011 = 31.25Hz (default)
  100 = 37.5Hz
  101 = 46.9Hz
  110 = 62.5Hz
  111 = 93.5Hz
Bits [2:0]: Spin-up:
  These bits contain the fan spin-up time:
  000 = 200ms
  001 = 400ms
  010 = 600ms
  011 = 800ms
  100 = 1s
  101 = 2s (default)
  110 = 4s
  111 = 8s
22
R/W
MAX6653/
MAX6664
01010101
MAX6663
01011111
Fan-speed configuration register:
Bits [7:4]: Unused.
Bits [3:0]: PWM duty cycle: These bits contain the PWM duty cycle for the PWM duty
  cycle fan-control mode. They also contain the minimum duty cycle that is
  applied to the fan:
  0000 = 0% output
  0001 = 7% output
  0010 = 14% output
  0011 = 20% output
  0100 = 27% output
  0101 = 33% output (default)
  0110 = 40% output
  0111 = 47% output
  1000 = 53% output
  1001 = 60% output
  1010 = 67% output
  1011 = 73% output
  1100 = 80% output
  1101 = 87% output
  1110 = 93% output
  1111 =100% output
Register Summary (continued)
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相关代理商/技术参数
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