MAX6616AEG+T【PDF 14/20 页】IC TEMP MON FAN CNTRL 24QSOP

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Dual-Channel Temperature Monitors and

Fan-Speed Controllers with Thermistor Inputs

14 ______________________________________________________________________________________

Table 3. Register Map (continued)

R/W ADD

POR

STATE

FUNCTION

R/W 1Ch

0000

Fan status

byte

1 = fan 1

failure

1 = fan 2

failure

1 =

disabled

fan 1

tach

1 =

disabled

fan 2 tach

1 =

measure

fan 1

when it is

full speed

1 =

measure

fan 2

when it is

full speed

1 = m ask

FAN_FAIL

i n

1 = fan 1

fail sets

fan 2

100%

1Eh

0000

Channel 1

temp LSBs

MSB

(1/2癈)

LSB

(1/8癈)

1Fh

0000

Channel 2

temp LSBs

MSB

(1/2癈)

LSB

(1/8癈)

FDh

0000

0001

Read device

revision

FEh

0110

1000

Read device

FFh

0100

1101

Read

m anufactur er

*GPIO0 POR values are set by PRESET.

Table 4. Configuration Byte Definition (02h)

BIT

NAME

POR

STATE

FUNCTION

RUN/STANDBY

Set to zero for normal operation. Set to 1 to suspend conversions and PWM outputs.

POR

Set to 1 to perform reset of all device registers.

TIMEOUT

Set TIMEOUT to zero to enable SMBus timeout for prevention of bus lockup. Set to 1 to

disable this function.

FAN1 PWM INVERT

Set fan PWM invert to zero to force PWM1 low when the duty cycle is 100%. Set to 1 to

force PWM1 high when the duty cycle is 100%.

FAN2 PWM INVERT

Set fan PWM invert to zero to force PWM2 low when the duty cycle is 100%. Set to 1 to

force PWM2 high when the duty cycle is 100%.

MIN DUTY CYCLE

Set min duty cycle to zero for a 0% duty cycle when the measured temperature is below the

fan-temperature threshold in automatic mode. When the temperature equals the fan-

temperature threshold, the duty cycle is the value in the fan-start duty-cycle register, and it

increases with increasing temperature.

Set min duty cycle to 1 to force the PWM duty cycle to the value in the fan-start duty-cycle

temperature increases above the temperature threshold, the duty cycle increases as

programmed.

TEMPERATURE

SOURCE SELECT

Selects either local or remote 2 as the source for temperature channel 2 register data.

When D1 = 0, the MAX6615/MAX6616 measure remote 2 and when D1 = 1, the

MAX6615/MAX6616 measure the internal die temperature.

SPIN-UP DISABLE

Set spin-up disable to 1 to disable spin-up. Set to zero for normal fan spin-up.

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