EMC2302 datasheet(38/70 Pages) MICROCHIP

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EMC2301/2/3/5

DS20006532A-page 38

 2021 Microchip Technology Inc.

6.13

PWM Divide Registers

The PWM Divide registers determine the final fre-

quency of the respective PWM Fan Driver. Each driver

base frequency is divided by the value of the respective

PWM Divide Register to determine the final frequency.

The duty cycle settings are not affected by these set-

tings, only the final frequency of the PWM driver. A

value of 00h will be decoded as 01h. The contents of

the register represent the weighting of each bit in deter-

mining the final output voltage.

6.14

Fan Configuration Registers

The Fan Configuration registers control the general

operation of the RPM-based Fan Speed Control algo-

rithm used for the respective Fan Driver (see

Section 4.3 “RPM-Based Fan Speed Control Algo-

rithm”).

PWM X DIVIDE - PWMX FREQUENCY DIVIDE REGISTER

(ADDRESSES 31H, 41H, 51H, 61H, 71H)

RW-0

PWMxD[7:0]

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 7-0

PWMxD]7:0]: PWM Frequency Divide value, where “x” represents PWM1 through 5 based on device

features.

FAN CONFIG - FAN CONFIGURATION REGISTERS

(ADDRESSES 32H, 42H, 52H, 62H, 72H)

RW-0

ENAGx

RNGx[1:0]

EDGx[1:0]

UDTx[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

ENAGx: Enable Closed Loop algorithm, where “x” is 1 to 5, depending on device features

1 = Closed Loop algorithm “x” is enabled. Changes to Fan Setting register are ignored.

0 = Closed Loop algorithm “x” is disabled, and device is placed in Direct Setting mode (see

Section 4.1 “Fan Control Modes of Operation”). Changes to the Fan Setting register will

change the PWM Duty Cycle.

bit 6-5

RNGx[1:0]: Range. Sets the minimum fan speed measured and reported, where “x” is 1 to 5,

depending on device features.

11 = 4000 RPM minimum, TACH count multiplier = 8.

10 = 2000 RPM minimum, TACH count multiplier = 4.

01 = 1000 RPM minimum, TACH count multiplier = 2.

00 = 500 RPM minimum, TACH count multiplier = 1.

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