MAX6640AEE Datasheet

IC型号：
MAX6640AEE
PDF描述：
2-Channel Temperature Monitor with Dual Automatic PWM Fan-Sp...
文件大小：
722.10KB
PDF页数：
22页
芯片厂家：
MAXIM

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2-Channel Temperature Monitor with Dual

Automatic PWM Fan-Speed Controller

MAX6640

RPM

TACH

0xFFh

MIN-5

MIN

TEMPERATURE

RPM

MAX

TACH

B+1

TACH

MAX

TACH

A+1

RPM

MIN

TACH

B+1

TACH

MIN

-5

MIN

TEMPERATURE

TACH

A+1

Figure 4. Tachometer Target Calculation

Figure 5. RPM Target Calculation

stored in register 22h or 23h. Bit 0 of register 11h (fan

1) and register 15h (fan 2) selects the behavior below

MIN

. If bit 0 is equal to zero, the fan will be completely

off below T

MIN

. When the temperature is falling, it must

drop 5掳C below T

MIN

before the fan turns off. If bit 0 is

set to 1, the fan does not turn off below T

MIN

, but

instead stays at the maximum tachometer count in reg-

ister 22h or 23h.

When the measured temperature is higher than T

MIN

the MAX6640 calculates the target tachometer count

value based on two linear equations. The target

tachometer count decreases by the tach step size

value stored in bits 7 through 4 of registers 11h and

15h each time the measured temperature increases by

the temperature step size value stored in bits 2 and 3 of

registers 11h and 15h. As the measured temperature

continues to increase, a second tachometer step size

goes into effect. Bits 3 through 0 of register 12h and

16h select the number temperature/PWM steps after

which the new step size takes effect. The new step size

is selected by bits 7 to 4 of registers 12h and 16h.

and channel 2 temperature registers do not update

until at least 250ms after the access of the associated

extended temperature registers. All values below 0掳C

return 00h.

Status Register (02h)

A 1 indicates that an

ALERT, THERM, OT,

or fan fault has

occurred. Reading this register clears bits 7, 6, 1, and 0.

Reading the register also clears the

ALERT

and

FANFAIL

outputs, but not the

THERM

and

outputs. If

the fault is still present on the next temperature measure-

ment cycle, any cleared bits and outputs are set again.

A successful alert response clears the values on the out-

puts but does not clear the status register bits. The

ALERT

bits assert when the measured temperature is

higher than the respective thresholds. The

THERM

and

outputs behave like comparators with 5掳C hysteresis.

Mask Register (03h)

This register masks the

ALERT, OT, THERM,

and

FANFAIL

outputs. A 1 prevents the corresponding fail-

ures from being asserted on these outputs. The mask

bits do not affect the status register.

Global Configuration Register (04h)

The global configuration register controls the shutdown

mode, power-on reset, SMBus timeout, and tempera-

ture channel 2 source select:

鈥?/div>

D7: Run/Standby.

Normal operation is

run

(0).

Setting this bit to 1 suspends conversions and puts

the MAX6640 into low-power sleep mode.

鈥?/div>

D6: Software POR.

Writing a 1 resets all registers to

their default values.

Channel 1 and Channel 2 Temperature Registers

(00h and 01h)

These registers contain the results of temperature mea-

surements. The MSB has a weight of +128掳C and the

LSB +1掳C. Temperature data for remote diode 1 is in

the channel 1 temperature register. Temperature data

for remote diode 2 or the local sensor (selectable by bit

4 in the global configuration register) is in the channel 2

temperature register. Three additional temperature bits

provide resolution down to 0.125掳C and are in the

channel 1 extended temperature (05h) and channel 2

extended temperature (06h) registers. The channel 1

______________________________________________________________________________________

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