ADT7463
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Table 61. PWM CONFIGURATION REGISTER BITS
Bit
Name
R/W
Description
<2:0>
SPIN
R/W
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, the TACH measurement
reads 0xFFFF and Status Register 2 reflects the fan fault. If the TACH Minimum High and Low
Byte contains 0xFFFF or 0x0000, the Status Register 2 Bit is not 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
<3>
SLOW
R/W
SLOW = 1 makes the ramp rates for acoustic enhancement four times longer.
<4>
INV
R/W
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
R/W
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 is disabled.
101 = Fastest speed calculated by Local and Remote 2 Temperature Control PWMx.
110 = Fastest speed calculated by all three Temperature Channels Control PWMx.
111 = Manual Mode. PWM duty cycle registers (Reg. 0x300x32) become writable.
Table 62. TEMP T
RANGE
/PWM FREQUENCY REGISTERS (POWERON DEFAULT = 0XC4) (Note 1)
Register Address
R/W
Description
0x5F
R/W
Remote 1 T
RANGE
/PWM1 Frequency
0x60
R/W
Local Temp T
RANGE
/PWM2 Frequency
0x61
R/W
Remote 2 T
RANGE
/PWM3 Frequency
1. These registers become readonly when the Configuration Register 1 Lock bit is set to 1. Further attempts to write to the is register have no
effect.
Table 63. TEMP T
RANGE
/PWM FREQUENCY REGISTER BITS
Bit
Name
R/W
Description
<2:0>
FREQ
R/W
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>
THRM
R/W
THRM = 1 causes the THERM
pin (Pin 14 or Pin 20) to assert low as an output when this
temperature channels THERM
limit is exceeded by 0.25癈. The THERM
pin remains asserted
until the temperature is equal to or below the THERM
limit. The minimum time that THERM
asserts for is one monitoring cycle. This allows clock modulation of devices that incorporate this
feature.
THRM = 0 makes the THERM
pin act as an input only, for example, for Pentium
?/DIV>
4 PROCHOT
monitoring, when Pin 14 or Pin 20 is configured as THERM
.
<7:4>
RANGE
R/W
These bits determine the PWM duty cycle vs. temperature slope for automatic fan control.
0000 = 2癈
0001 = 2.5癈
0010 = 3.33癈
0011 = 4癈
0100 = 5癈
0101 = 6.67癈
0110 = 8癈
0111 = 10癈
1000 = 13.33癈
1001 = 16癈
1010 = 20癈
1011 = 26.67癈
1100 = 32癈 (Default)
1101 = 40癈
1110 = 53.33癈
1111 = 80癈
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