EMC2302 datasheet(44/70 Pages) MICROCHIP

44 / 70 page

EMC2301/2/3/5

DS20006532A-page 44

 2021 Microchip Technology Inc.

6.21

Drive Fail Band Registers

The Drive Fail Band registers store the number of tach

counts used by the Fan Drive Fail detection circuitry.

This circuitry is activated when the fan drive setting

high byte is at FFh. When it is enabled, the actual mea-

sured fan speed is compared against the target fan

speed. These registers are only used when the FSC

algorithm is active.

This circuitry is used to indicate that the target fan

speed at full drive is higher than the fan is actually

capable of reaching. If the measured fan speed does

not exceed the target fan speed minus the Fan Drive

Fail Band register settings for a period of time longer

than set by the DFCx[1:0] bits, then the DRIVE_FAIL

status bit will be set and an interrupt generated (see

Section 4.4.4 “Aging Fan or Invalid Drive Detec-

tion”). The contents of Register 6-20 and Register 6-

21 represent the weighting of each bit in determining

the final number of tach counts used by the Fan Drive

Fail detection circuitry.

DRIVE FAIL - DRIVE FAIL BAND HIGH BYTE REGISTER

(ADDRESSES 3BH, 4BH, 5BH, 6BH, 7BH)

RW-0

FxDF[12:5]

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 7-0

FxDF[12:5]: Drive Fail Band High Byte, where “x” represents 1 through 5 based on device features.

bit 7

4096

bit 6

2048

bit 5

1024

bit 4

512

bit 3

256

bit 2

128

bit 1

bit 0

DRIVE FAIL - DRIVE FAIL BAND LOW BYTE REGISTER

(ADDRESSES 3AH, 4AH, 5AH, 6AH, 7AH)

RW-0

U-0

FxDF[4:0]

—

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 7-3

FxDF[5:0]: Drive Fail Band Low Byte, where “x” represents 1 through 5 based on device features.

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2-0

Unimplemented bits, read as ‘0’.

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