MAX6639(2005) Просмотр технического описания (PDF) - Maxim Integrated

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MAX6639
(Rev.:2005)

2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller

Maxim Integrated 

2-Channel Temperature Monitor with Dual,

Automatic, PWM Fan-Speed Controller

Table 4. Register Map (continued)

READ/

WRITE

REGISTER

NO.

POR

STATE

FUNCTION

D7

D6

ADDRESS

W

26h

0011 Fan 1 target

1100 duty cycle

MSB

—

R

27h

0000 Fan 2 current

0000 duty cycle

MSB

—

W

27h

0011 Fan 2 target

1100 duty cycle

MSB

—

Channel 1

R/W

28h

0100

000

minimum

fan-start

MSB

—

temperature

Channel 2

R/W

29h

0100

0000

minimum

fan-start

MSB

—

temperature

R

3Dh

0101 Read device

0

1

1000

ID

R

3Eh

0100

1101

Read

manufacturer

ID

0

1

R

3Fh

0000 Read device

0000 revision

0

0

Global Configuration Register (04h)

The global configuration register controls the shutdown

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

ture channel 2 source select:

• D7: Run/Standby. Normal operation is run (0).

Setting this bit to 1 suspends conversions and puts

the MAX6639 into low-power sleep mode.

• D6: Software POR. Writing a 1 resets all registers to

their default values.

• D5: SMBus Timeout Disable. Writing a zero

enables SMBus timeout for prevention of bus lockup.

When the timeout function is enabled, the SMBus

interface is reset if SDA or SCL remains low for more

than 74ms (typ).

• D4: Temperature Channel 2 Source. Selects either

local or remote 2 as the source for temperature

channel 2 register data. Writing a zero to this bit

selects remote 2 for temperature channel 2.

• D3: PWM Output Frequency Range. Selects either

the 20Hz to 100Hz range or the 5kHz to 25kHz range

for the PWM outputs (see Table 9).

D5

D4

D3

D2

D1

D0

—

—

—

—

—

LSB

—

—

—

—

—

LSB

—

—

—

—

—

LSB

—

—

—

—

—

LSB

—

—

—

—

—

LSB

0

1

1

0

0

0

0

0

1

1

0

1

0

0

0

0

0

0

Extended Temperature Registers (05h and 06h)

These registers contain the extended temperature data

from channels 1 and 2. Bits D[7:5] contain the 3 LSBs

of the temperature data. The bit values are 0.5°C,

0.25°C, and 0.125°C. When bit 0 is set to 1, a diode

fault has been detected.

Channel 1 and Channel 2 ALERT, OT, and THERM

Limits (08h Through 0Dh)

These registers contain the temperatures above which

the ALERT, THERM, and OT status bits set and outputs

assert (for the temperature channels that are not

masked). The data format is the same as that of the

channel 1 and channel 2 temperature registers: the

LSB weight is +1°C and the MSB is +128°C.

______________________________________________________________________________________ 13

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