EMC2302 datasheet(47/70 Pages) MICROCHIP

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 2021 Microchip Technology Inc.

DS20006532A-page 47

EMC2301/2/3/5

6.23

TACH Reading Registers

The TACH Reading Registers describe the current

tachometer reading for each of the fans (see

Section 4.4 “Tachometer Measurement”). The con-

tents of Register 6-24 and Register 6-25 represent the

weighting of each bit in determining the current

tachometer reading for each of the fans.

TACH READING - TACHOMETER READING HIGH BYTE REGISTER

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

RW-0

U-0

FxTR[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

FxTR[12:5]: Fan Drive Tach Reading Counts, 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

TACH READING - TACHOMETER READING LOW BYTE REGISTER

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

RW-0

U-0

FxTR[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

FxTR[12:5]: Fan Drive Tach Reading Counts, where “x” represents 1 through 5 based on device

features.

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2-0

Unimplemented bit, read as ‘0’.

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