EMC2302 datasheet(40/70 Pages) MICROCHIP

40 / 70 page

EMC2301/2/3/5

DS20006532A-page 40

 2021 Microchip Technology Inc.

6.16

PID Gain Register

See Section 4.3.3.2 “Setting the PID Gains”.

bit 4-3

DPTx[1:0]: Derivative Options. Determines what form of derivative will be used in the Fan Speed

Setting calculation (see Section 4.3.3.1 “Selecting the Derivative Options”).

11 = BOTH

10 = STEP

01 = BASIC

00 = NONE

bit 2-1

ERGx[1:0]: Error Window. Determines the range of the error window. When the measured fan speed

is within the programmed error window around the target speed, then the fan drive setting is not

updated. The algorithm will continue to monitor the fan speed and calculate necessary drive set-

ting changes base on the error; however, these changes are ignored (see Section 4.3.1 “Error

Window”). “X” is 1 to 5, depending on device features.

11 = 200 RPM

10 = 100 RPM

01 = 50 RPM

00 = 0 RPM

bit 0

Unimplemented bit, read as ‘0’.

FAN CONFIG 2 - FAN CONFIGURATION 2 REGISTERS

(ADDRESSES 33H, 43H, 53H, 63H, 73H) (CONTINUED)

GAIN - PIDX GAIN REGISTER (ADDRESSES 35H, 45H, 55H, 65H, 75H)

U-0

RW-0

—

GDEx[1:0]

GINx[1:0]

GPRx[1:0]

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 bits, read as ‘0’.

bit 5-4

GDEx[1:0]: Derivative Gain, where “x” is 1 to 5, depending on device features. The effective gain

applied to the KD in the PID equation.

11 = 8x

10 = 4x

01 = 2x

00 = 1x

bit 3-2

GINx[1:0]: Integral Gain, where “x” is 1 to 5, depending on device features. The effective gain applied

to the KI in the PID equation.

11 = 8x

10 = 4x

01 = 2x

00 = 1x

bit 1-0

GPRx[1:0]: Proportional Gain, where “x” is 1 to 5, depending on device features. The effective gain

applied to the KP in the PID equation.

11 = 8x

10 = 4x

01 = 2x

00 = 1x

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