EMC2101-R-ACZL-TR datasheet(34/56 Pages) MICROCHIP

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EMC2101

DS20006703A-page 34

 2022 Microchip Technology Inc. and its subsidiaries

5.17

Fan Spin Up Configuration

The Fan Spin Up Configuration register controls the

spin-up behavior of the device. The Fan driver enters

its spin-up routine any time it transitions from a

minimum fan setting (00h) to a higher fan setting (but

does not invoke the spin-up routine upon power up).

Once the spin-up time has been met, the fan driver is

reduced to the programmed setting.

TABLE 5-4:

TACH MODES

TACH_M[1]

TACH_M[0]

TACH Mode

False readings when under minimum

detectable RPM (TACH Limit).

(Default condition, see Note)

FFFFh reading when under minimum

detectable RPM.

Note:

When the PWM base clock is set at 360kHz mode 00b is used regardless of the setting of the TACH_M[1:0]

bits.

FAN SPIN UP CONFIGURATION REGISTER (ADDRESS 4Bh)

U-0

RRRR

—

FAST_TACH

SPIN_DRIVE[1:0]

SPIN_TIME[2:0]

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as 0

-n = Value at POR

‘1’ = bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-6

Unimplemented: Read as ‘0

bit 5

FAST_TACH: Determines whether the Spin-Up routine aborts when the measured TACH is less than

the TACH Limit.

1 = (default) The Spin-Up routine will abort when the TACH measurement is less than the TACH Limit

or the programmed Spin-Up time is met, whichever is less. In this case, the SPIN_DRIVE[1:0] bits are

ignored and the drive will always be at 100%.

0 = The Spin-Up routine uses the duty cycle and spin-up time independently of the TACH reading.

This bit will be ignored if the ALT_TCH bit in the Configuration Register (see Section 5.5, Configuration

If the SPIN_TIME[2:0] bits are set at 000b, then the Spin-Up Routine is bypassed regardless of the

status of this bit.

bit 4-3

SPIN_DRIVE: Determines the setting of the drive circuit during the Spin-Up routine according to

Table 5-5.

bit 2-0

SPIN_TIME: Determines the length of time that the fan drive will remain at the SPIN_DRIVE[1:0]

setting as shown in Table 5-6.

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