MAX6664AEE+ Datasheet MAX6664AEE+T, MAX6653AEE+, MAX6653AEE+T | P16-P18

MAX6653/MAX6663/MAX6664

Temperature Monitors and

PWM Fan Controllers

16 ______________________________________________________________________________________

Addr

(

)

READ/WRITE POR STATE DESCRIPTION

02 R 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.

03 R 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.

06 R 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.

08 R 1111 1111

Fan-speed reading register:

This register contains the fan-speed tachometer measurement.

MAX6653/MAX6663/MAX6664

Temperature Monitors and

PWM Fan Controllers

______________________________________________________________________________________ 17

Addr

(

)

READ/WRITE POR STATE DESCRIPTION

0A R

0001 1110

(30°C)

Local temperature data:

This register contains the 8 MSBs of the local temperature measurement.

0B R

0001 1110

(30°C)

Remote temperature data:

This register contains the 8 MSBs of the local temperature measurement.

0D R/W 0000 0000

Local temperature offset:

Bit 7: Sign bit; when zero, the offset value in bits [3:0] is added to the measured local

temperature reading. When this bit is 1, the offset value in bits [3:0] is subtracted

from the local temperature reading.

Bits [6:4] Unused. This bits normally reads back zeros.

Bits [3:0] Offset value. This is added to or subtracted from the measured local

temperature reading.

0E R/W 0000 0000

Remote temperature offset:

Bit 7: Sign bit: When 0, the offset value in bits [3:0] is added to the measured remote

temperature reading. When this bit is 1, the offset value in bits [3:0] is subtracted

from the remote temperature reading.

Bits [6:4] Unused: These bits normally read back zeros.

Bits [3:0] Offset value: This is added to or subtracted from the measured remote

temperature reading.

10 R/W 1111 1111

Fan tachometer high-limit register:

Contains the limit of the fan-speed measurement. It detects a stalled fan if the

measured fan-speed data (reg_08h; proportional to fan period) is larger than the limit.

14 R/W

0011 1100

(60°C)

Local temp high limit:

Contains the local high-temperature interrupt limit.

15 R/W

0000 0000

(0°C)

Local temp low limit:

Contains the local low-temperature interrupt limit.

16 R/W

0100 0110

(70°C)

Local temp THERM limit:

Contains the local high-temperature limit for the THERM output. Default is +70°C for

the MAX6663/MAX6664; CRIT0 and CRIT1 determine the default value for the

MAX6653 (see Table 1).

18 R/W

0101 0000

(80°C)

Remote temp high limit:

Contains the remote high-temperature interrupt limit.

19 R/W

0000 0000

(0°C)

Remote temp low limit:

Contains the remote low-temperature interrupt limit.

1A R/W

0110 0100

(100°C)

Remote temp THERM limit:

Contains the remote high-temperature limit for the THERM output. Default is +100°C

for the MAX6663/MAX6664; CRIT0 and CRIT1 determine the default value for the

MAX6653 (see Table 1).

1B R/W

0101 1111

(95°C)

Local temp shutdown limit:

Contains the local high-temperature limit for the SDL output. CRIT0 and CRIT1

determine the default value for the MAX6653 (see Table 1).

1C R/W

0111 1101

(125°C)

Remote temp shutdown limit:

Contains the remote high-temperature limit for the SDR output. CRIT0 and CRIT1

determine the default value for the MAX6653 (see Table 1).

MAX6653/MAX6663/MAX6664

Temperature Monitors and

PWM Fan Controllers

18 ______________________________________________________________________________________

Addr(H) READ/WRITE POR STATE DESCRIPTION

20 R/W 0101 1101

Fan characteristics register:

Bits [7:6]: N factor:

These bits contain the N factor for the fan-speed range:

00 = 1 (fail speed =2647RPM)

01 = 2 (fail speed =1324RPM) (default)

10 = 4 (fail speed = 662RPM)

11 = 8 (fail speed = 331RPM)

Bits [5:3]: PWM frequency:

These bits contain the nominal PWM output frequency:

000 = 11.7Hz

001 = 15.6Hz

010 = 23.4Hz

011 = 31.25Hz (default)

100 = 37.5Hz

101 = 46.9Hz

110 = 62.5Hz

111 = 93.5Hz

Bits [2:0]: Spin-up:

These bits contain the fan spin-up time:

000 = 200ms

001 = 400ms

010 = 600ms

011 = 800ms

100 = 1s

101 = 2s (default)

110 = 4s

111 = 8s

22 R/W

MAX6653/

MAX6664

01010101

MAX6663

01011111

Fan-speed configuration register:

Bits [7:4]: Unused.

Bits [3:0]: PWM duty cycle: These bits contain the PWM duty cycle for the PWM duty

cycle fan-control mode. They also contain the minimum duty cycle that is

applied to the fan:

0000 = 0% output

0001 = 7% output

0010 = 14% output

0011 = 20% output

0100 = 27% output

0101 = 33% output (default)

0110 = 40% output

0111 = 47% output

1000 = 53% output

1001 = 60% output

1010 = 67% output

1011 = 73% output

1100 = 80% output

1101 = 87% output

1110 = 93% output

1111 =100% output

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24

MAX6664AEE+

Mfr. #:

Buy MAX6664AEE+

Manufacturer:

Maxim Integrated

Description:

Board Mount Temperature Sensors Temperature Monitor & PWM Fan Controlle

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New from this manufacturer.

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MAX6664AEE+

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