EMC2101-R-ACZL-TR datasheet(35/56 Pages) MICROCHIP

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 2022 Microchip Technology Inc. and its subsidiaries

DS20006703A-page 35

EMC2101

5.18

Fan Setting Register

The Fan Setting Register drives the fan driver when the

Fan Control Look-Up Table is not used (see

Section 5.16 “Fan Configuration Register”). Any

data written to the Fan Setting registers is applied

immediately to the fan driver (PWM or DAC). When the

Fan Control Look-Up Table is being used, any writes to

this register will be ignored. If the Fan Control Look-Up

Table is disabled, then the fan drive will be set at the

last value that was used by the Fan Control Look-Up

Table.

When the Fan Control Look-Up Table Registers are

being used, the register is read-only.

The register applies to the fan driver in both PWM and

DAC operating modes. The DAC output is determined

by Equation 5-3 below.

EQUATION 5-3:

These values are independent of the POLARITY bit

(see Section 5.16 “Fan Configuration Register”s).

Therefore, a value of 00h in the Fan Setting Register

will always refer to minimum output drive while a setting

of 3Fh in the Fan Setting Register will always refer to

maximum output drive.

The output of the DAC driver is dependent upon the

current load. With a low current load, the output will be

from 0V to an LSB (approximately 52 mV at

VDD =3.3V) below VDD with a maximum of 64 linear

steps.

TABLE 5-5:

SPIN-UP DRIVE

SPIN_DRIVE[1:0]

Spin-Up Drive

0 - Spin-Up Cycle bypassed

50% (half drive)

75% (3/4 drive)

100% (full drive) (default)

TABLE 5-6:

SPIN-UP TIME

SPIN_TIME[2:0]

Spin-Up Time

0 - Spin-Up Cycle bypassed

0.05 sec.

0.1 sec.

0.2 sec.

0.4 sec.

0.8 sec.

1.6 sec.

3.2 sec. (default)

FAN SETTING REGISTER (ADDRESS 4Ch)

Address

R/W

Default

4Ch

R/W

(see text)

Fan Setting

—

8421

00h

FAN

FAN_SETTING

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