REV. C

–42–

ADT7463

Register Address

R/W*

Description

Power-On Default

0x5F

Read/Write

0xC4

0x60

Read/Write

0xC4

0x61

Read/Write

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>

THRM

Read/Write

THRM = 1 causes the THERM pin (Pin 14 or 20) to assert low as an output when this

temperature channel’s THERM limit has been exceeded by 0.25�C. 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 modu-

lation of devices that incorporate this feature.

THRM = 0 makes the THERM pin act as an input only, e.g., for Pentium 4 PROCHOT

monitoring, when Pin 14 or 20 is configured as THERM.

<7:4>

RANGE

Read/Write

These bits determine the PWM duty cycle versus the temperature slope for

automatic fan control.

0000 = 2�C

0001 = 2.5�C

0010 = 3.33�C

0011 = 4�C

0100 = 5�C

0101 = 6.67�C

0110 = 8�C

0111 = 10�C

1000 = 13.33�C

1001 = 16�C

1010 = 20�C

1011 = 26.67�C

1100 = 32�C (Default)

1101 = 40�C

1110 = 53.33�C

1111 = 80�C

*These registers become read-only when the Configuration Register 1 Lock bit is set. Any further attempts to write to these registers shall have no effect.

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