LM93 datasheet(71/92 Pages) NSC

71 / 92 page

16.0 Registers (Continued)

16.8.14 Register C9h

PWM1 Control 2

Address

Read/

Write

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

Value

C9h

R/W

PWM1

Control 2

OVR_DC

EPPL

INV

OVR

00h

Bit

Name

R/W

Description

OVR

R/W

When set, enables manual duty cycle override for

PWM1.

INV

R/W

Invert PWM1 output. When 0, 100% duty cycle

corresponds to the PWM output continuously HIGH.

When 1, 100% duty cycle corresponds to the PWM

output continuously LOW.

EPPL

R/W

Enable PROCHOT PWM1 lock. When set, this bit

causes bound PROCHOT events on PWM1 to trigger

PPL (bit [3]). When cleared, PPL never gets set.

PPL

R/W

PROCHOT PWM1 lock. When set, this bit indicates

that PWM1 is currently being held at 100% because a

bound PROCHOT event occurred while EPPL (bit [2])

was set. This bit is cleared by writing a zero. Clearing

this bit allows the fans to return to normal operation.

This bit is not locked by the LOCK bit in the LM93

Configuration register.

7:4

OVR_DC

R/W

This field sets the duty cycle that will be used by

PWM1 whenever manual override mode is active.

This field accepts 16 possible values that are mapped

to duty cycles according the table in the Fan Control

section. Whenever this register is read, it returns the

duty cycle that is currently being used by PWM1

regardless of whether override mode is active or not.

The value read may not match the last value written if

another control source is requesting a greater duty

cycle. This field always returns 0h when the PWM1

spin up cycle is active.

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