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REV. A
ADM1027
47
Table XVII. TEMP T
RANGE
/PWM Frequency Registers
Register Address
R/W
Description
Power-On Default
0x5F
Read/Write
Remote 1 T
RANGE
/PWM 1 Frequency
0xC4
0x60
Read/Write
Local Temperature T
RANGE
/PWM 2 Frequency
0xC4
0x61
Read/Write
Remote 2 T
RANGE
/PWM 3 Frequency
0xC4
Bit
Name
Read/Write
Description
<2:0>
FREQ
Read/Write
These bits control the PWMx frequency.
000 = 11.0 Hz
001 = 14.7 Hz
010 = 22.1 Hz
011 = 29.4 Hz
100 = 35.3 Hz (default)
101 = 44.1 Hz
110 = 58.8 Hz
111 = 88.2 Hz
<3>
Reserved
Read/Write
Reserved for future use.
<7:4>
RANGE
Read/Write
These bits determine the PWM duty cycle versus temperature slope for automatic
fan control.
0000 = 2
o
C
0001 = 2.5
o
C
0010 = 3.33
o
C
0011 = 4
o
C
0100 = 5
o
C
0101 = 6.67
o
C
0110 = 8
o
C
0111 = 10
o
C
1000 = 13.33
o
C
1001 = 16
o
C
1010 = 20
o
C
1011 = 26.67
o
C
1100 = 32
o
C (default)
1101 = 40
o
C
1110 = 53.33
o
C
1111 = 80
o
C
These registers become read-only when the Configuration Register 1 lock bit is set. Any further attempts to write to these registers
will have no effect.
Rev. 3 | Page 47 of 56 | www.onsemi.com
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