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

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Sheet目录44

12页 13页 14页 15页 [16页]17页 18页 19页 20页

Temperature Monitors and

PWM Fan Controllers

16 ______________________________________________________________________________________

Addr H

READ/WRITE POR STATE

DESCRIPTION

0000 0000

Status register 1:

Bit 7: Local temp low:

1: Local temp low interrupt limit has been exceeded. This bit is cleared by

reading status register 1 for the MAX6653/MAX6663/MAX6664 or completing an

alert response protocol for the MAX6664. This bit is asserted on the next cycle if

the local temperature is still less than the limit.

Bit 6: Local temp high:

1: Local temp high interrupt limit has been exceeded. This bit is cleared by

reading status register 1 for the MAX6653/MAX6663/MAX6664 or completing an

alert response protocol for the MAX6664. This bit is asserted on the next cycle if

the local temperature is still greater than the limit.

Bit 5: Remote-diode error:

1: remote-diode short circuit or open circuit detected.

Bit 4: Remote temp THERM:

1: Remote temp THERM limit has been exceeded. This bit is cleared by reading

status register 1.

Bit 3: Remote temp low:

1: Remote temp low interrupt limit has been exceeded. This bit is cleared by

reading status register 1 for the MAX6653/MAX6663/MAX6664 or completing an

alert response protocol for the MAX6664. This bit is asserted on the next cycle if

the remote temperature is still less than the limit.

Bit 2: Remote temp high:

1: Remote temp high interrupt limit has been exceeded. This bit is cleared by

reading status register 1 for the MAX6653/MAX6663/ MAX6664 or completing an

alert response protocol for the MAX6664. This bit is asserted on the next cycle if

the remote temperature is still greater than the limit.

Bit 1: Fan fault:

1: The fan is running under speed. This bit is cleared by reading status register 1

or completing an alert response protocol. This bit is asserted again on the next

cycle if the fan fault still exists.

Bit 0: Alarm speed:

For MAX6663, this bit is set to 1 when the PWM duty cycle = 100%. Once read,

this bit does not reassert on the next monitoring cycle, even if the condition still

exists. It is asserted again if the condition is discontinued and then returns. For

the MAX6653/MAX6664, this bit is set to 1 when the THERM output goes to low.

0000 0000

Status register 2:

Bit 7: THERM:

1: THERM has been pulled low externally. This bit clears on a read of status

Bit 6: Local temp THERM:

1: Local temp THERM limit has been exceeded. This bit is cleared by reading

status register 2.

Bits [5:0]: Unused.

0000 0000

Extended bits of temperature data:

Bits [7:5]: Extended bits for local temperature data.

Bits [4:3]: Unused.

Bits [2:0]: Extended bits for remote temperature data.

1111 1111

Fan-speed reading register:

This register contains the fan-speed tachometer measurement.

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