LM63 datasheet(16/28 Pages) NSC

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2.0 LM63 Registers (Continued)

LM63 Register Descriptions In Functional Order

Fan Control Registers

Address

Hex

Read/

Write

Bits

POR

Value

Name

Description

HEX FAN PWM AND TACHOMETER CONFIGURATION REGISTER

R/W

7:6

PWM

Program

These bits are unused and always set to 0.

0: the PWM Value (register 4C) and the Lookup Table (50–5F) are

read-only. The PWM value (0 to 100%) is determined by the current

remote diode temperature and the Lookup Table, and can be read from

the PWM value register.

1: the PWM value (register 4C) and the Lookup Table (Register 50–5F)

are read/write enabled. Writing the PWM Value register will set the

PWM output. This is also the state during which the Lookup Table can

be written.

PWM

Output

Polarity

0: the PWM output pin will be 0 V for fan OFF and open for fan ON.

1: the PWM output pin will be open for fan OFF and 0 V for fan ON.

PWM Clock

Select

if 0, the master PWM clock is 360 kHz

if 1, the master PWM clock is 1.4 kHz.

[Reserved]

Always write 0 to this bit.

1:0

Tachometer

Mode

00: Traditional tach input monitor, false readings when under minimum

detectable RPM.

01: Traditional tach input monitor, FFFF reading when under minimum

detectable RPM.

10: Most accurate readings, FFFF reading when under minimum

detectable RPM.

11: Least effort on programmed PWM of fan, FFFF reading when under

minimum detectable RPM.

Note: If the PWM Clock is 360 kHz, mode 00 is used regardless of the

setting of these two bits.

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