LM64 datasheet(19/29 Pages) NSC

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2.0 LM64 Registers (Continued)

Fan Control Registers (Continued)

Address

Hex

Read/

Write

Bits

POR

Value

Name

Description

HEX FAN PWM FREQUENCY REGISTER

R/W

7:5

000

PWM

Frequency

These bits are unused and always set to 0

4:0

10111

The PWM Frequency = PWM_Clock / 2n, where PWM_Clock = 360

kHz or 1.4 kHz (per the PWM Clock Select bit in Register 4A), and n =

value of the register. Note: n = 0 is mapped to n = 1. See the

Application Note at the end of this datasheet.

HEX PWM VALUE REGISTER

Read

(Write

only if

reg

4A bit

5 = 1.)

7:6

PWM

Value

These bits are unused and always set to 0

5:0

000000

If PWM Program (register 4A, bit 5) = 0 this register is read only and

reflects the LM64’s current PWM value from the Lookup Table.

If PWM Program (register 4A, bit 5) = 1, this register is read/write and

the desired PWM value is written directly to this register, instead of

from the Lookup Table, for direct fan speed control.

This register will read 0 during the Spin-Up cycle.

See Application Notes section at the end of this datasheet for more

information regarding the PWM Value and Duty Cycle in %.

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