MAX6664AEE+T【PDF 9/24 页】IC TEMP MON FAN CNTRL 16-QSOP

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Temperature Monitors and

PWM Fan Controllers

_______________________________________________________________________________________ 9

Temperature Comparison

and Interrupt System

At the end of each conversion cycle, the converted

temperature data are compared to various set-point

thresholds to control the INT, THERM, SDL, and SDR

outputs. All temperature threshold limits are stored in

the threshold limit registers (Table 6) and can be

changed through the SMBus digital interface.

THERM is an active-low thermal-overload output indicat-

ing that the THERM overtemperature set point is exceed-

ed. With the THERM threshold set to an appropriate value,

the THERM output can be used to control clock throttling.

When this pin is pulled low by an external signal, a status

bit (bit 7, status register 2) is set, and the fan speed is

unconditionally forced to full-on speed. The only way to

reset the status bit is to read status register 2. Connect a

10k& pullup resistor between THERM and V

Table 4. Temperature Data Low Byte Format Structure: LLLXXRRR*

Table 5. Temperature Conversion Rate Setting (Fan Filter Register (23h)POR = 111)

FRACTIONAL TEMPERATURE (?/SPAN>C)

DIGITAL OUTPUT (LOCAL)

DIGITAL OUTPUT (REMOTE)

0.000

000X XXXX

XXX XX 000

0.125

001X XXXX

XXX XX 001

0.25

010X XXXX

XXX XX 010

0.375

011X XXXX

XXX XX 011

0.5

100X XXXX

XXX XX 100

0.625

101X XXXX

XXX XX 101

0.75

110X XXXX

XXX XX 110

0.875

111X XXXX

XXX XX 111

BIT 4

BIT 3

BIT2

CONVERSION RATE (Hz)

CONVERSION TIME (s)

0.0625

0.125

0.25

0.5

0.25

*Where: LLL = local fractional temperature bits, XX = dont care, RRR = remote fractional temperature bits.

NAME

ADDRESS

R/W

MAX6653 POR VALUE

MAX6663/MAX6664 POR STATE

DESCRIPTION

LTH

14h

R/W

Set by CRIT0 and CRIT1

0011 1100

Local temp high limit

LTL

15h

R/W

Set by CRIT0 and CRIT1

0000 0000

Local temp low limit

LTHER

16h

R/W

Set by CRIT0 and CRIT1

0100 0110

Local temp THERM limit

RTH

18h

R/W

Set by CRIT0 and CRIT1

0101 0000

Remote temp high limit

RTL

19h

R/W

Set by CRIT0 and CRIT1

0000 0000

Remote temp low limit

RTHER

1Ah

R/W

Set by CRIT0 and CRIT1

0110 0100

Remote temp THERM limit

LTSD

1Bh

R/W

Set by CRIT0 and CRIT1

N/A

Local temp shutdown limit

(MAX6653 only)

RTSD

1Ch

R/W

Set by CRIT0 and CRIT1

N/A

Remote temp shutdown limit

(MAX6653 only)

Table 6. Threshold Limit Registers

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