Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - temperature management Internal, External I²C/SMBus QSOP 16

MAX6653/MAX6663/MAX6664

Temperature Monitors and

PWM Fan Controllers

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Addr

(

)

READ/WRITE POR STATE DESCRIPTION

00 R/W

MAX6653

0000 1001

MAX6663

00000001

MAX6664

10010001

Configuration register 1:

Bits [7:5]: Setting the fan-speed control mode:

Bit 7 = 1: Enables automatic fan-speed control mode.

Bits [6:5] = 00: Remote temperature controls the fan speed.

Bits [6:5] =11: Both remote and local temperature control the fan speed.

Bit 7 = 0, Enables PWM control mode or RPM control mode.

Bits [6:5] = X0: PWM duty cycle control mode.

Bits [6:5] = X1: RPM control mode.

Bit 4: FAN_FAULT output enable:

1: FAN_FAULT output enabled; 0: (default) FAN_FAULT output disabled.

Bit 3: Invert the PWM output:

0: (default) PWM active low; 1: (inverted) PWM active high.

Bit 2: TACHOMETER digital/analog input selection:

0: (default) TACHOMETER is a logic input; 1: TACHOMETER is an analog input.

Bit 1: INT output enable:

0: INT output disabled; 1: INT output enabled.

Bit 0: Monitoring:

0: sleep mode; 1: (default) active temperature monitoring and fan-speed control.

(Keep this bit set to 1 for MAX6663.) Although the default value of this bit is 1, fan

speed control for the MAX6653 and MAX6664 is inactive until a 1 is written

to this bit.

01 R/W 0111 1111

Configuration register 2:

Bit 7: Reset:

Setting this bit to 1 restores all registers to POR default states; self-clears to zero

after reset.

Bit 6: Unused.

Bit 5: Remote temperature enable:

0: interrupts disabled for remote channel; 1: interrupts enabled for remote

channel; defaults to 1 unless a diode fault is detected on power-up.

Bit 4: Local temperature enable:

0: interrupts disabled for local channel; 1: (default) interrupts enabled for local

channel.

Bit 3: INT input function mask:

0: enable INT input function; 1: (default) disable INT input function.

Bit 2: TACHOMETER input enable:

0: disable TACHOMETER input; 1: (default) enable the TACHOMETER input.

(Keep this bit set to 1 for MAX6663.)

Bit 1: SMBus timeout enable:

0: SMBus timeout disabled; 1: (default) SMBus timeout enabled.

Bit 0: PWM out enable:

0: PWM output disabled; 1: (default) PWM output enabled.