ADT7467ARQZ-R7 datasheet(54/77 Pages) ONSEMI

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ADT7467

Rev. 3 | Page 54 of 77 | www.onsemi.com

Enabling the THERM Trip Point as the Operating Point

Bits <4:2> of the dynamic TMIN control Register 1 (0x36)

enable/disable THERM monitoring to program the operating

point.

Dynamic TMIN Control Register 1 (0x36)

<2> PHTR1 = 1 copies the Remote 1 current temperature to the

Remote 1 operating point register if THERM is asserted. The

operating point contains the temperature at which THERM is

asserted. This allows the system to run as quietly as possible

without affecting system performance.

PHTR1 = 0 ignores THERM assertions. The Remote 1

operating point register reflects its programmed value.

<3> PHTL = 1 copies the local current temperature to the local

temperature operating point register if THERM is asserted. The

operating point contains the temperature at which THERM is

asserted. This allows the system to run as quietly as possible

without affecting system performance.

PHTL = 0 ignores THERM assertions. The local temperature

operating point register reflects its programmed value.

<4> PHTR2 = 1 copies the Remote 2 current temperature to the

Remote 2 operating point register if THERM is asserted. The

operating point contains the temperature at which THERM is

asserted. This allows the system to run as quietly as possible

without affecting system performance.

PHTR2 = 0 ignores THERM assertions. The Remote 2

operating point register reflects its programmed value.

Enabling Dynamic TMIN Control Mode

Bits <7:5> of the dynamic TMIN control Register 1 (0x36)

enable/disable dynamic TMIN control on the temperature

channels.

Dynamic TMIN Control Register 1 (0x36)

<5> R1T = 1 enables dynamic TMIN control on the Remote 1

temperature channel. The chosen TMIN value is dynamically

adjusted based on the current temperature, operating point, and

high and low limits for this zone.

R1T = 0 disables dynamic TMIN control. The TMIN value chosen

is not adjusted, and the channel behaves as described in the

Automatic Fan Control Overview section.

<6> LT = 1 enables dynamic TMIN control on the local

temperature channel. The chosen TMIN value is dynamically

adjusted based on the current temperature, operating point, and

high and low limits for this zone.

LT = 0 disables dynamic TMIN control. The TMIN value chosen

is not adjusted, and the channel behaves as described in the

Enhancing System Acoustics section.

<7> R2T = 1 enables the dynamic TMIN control on the Remote 2

temperature channel. The chosen TMIN value is dynamically

adjusted based on the current temperature, operating point, and

high and low limits for this zone.

R2T = 0 disables dynamic TMIN control. The TMIN value chosen

is not adjusted, and the channel behaves as described in the

Enhancing System Acoustics section.

STEP 12: RAMP RATE FOR ACOUSTIC

ENHANCEMENT

The optimal ramp rate for acoustic enhancement can be

determined through system characterization after completing

the thermal optimization. If possible, the effect of each ramp

rate should be logged to determine the best setting for a given

solution.

Enhanced Acoustics Register 1 (0x62)

<2:0> ACOU selects the ramp rate for PWM1.

000 = 1 time slot = 35 sec

001 = 2 time slots = 17.6 sec

010 = 3 time slots = 11.8 sec

011 = 5 time slots = 7 sec

100 = 8 time slots = 4.4 sec

101 = 12 time slots = 3 sec

110 = 24 time slots = 1.6 sec

111 = 48 time slots = 0.8 sec

Enhanced Acoustics Register 2 (0x63)

<2:0> ACOU3 selects the ramp rate for PWM3.

000 = 1 time slot = 35 sec

001 = 2 time slots = 17.6 sec

010 = 3 time slots = 11.8 sec

011 = 5 time slots = 7 sec

100 = 8 time slots = 4.4 sec

101 = 12 time slots = 3 sec

110 = 24 time slots = 1.6 sec

111 = 48 time slots = 0.8 sec

<6:4> ACOU2 selects the ramp rate for PWM2.

000 = 1 time slot = 35 sec

001 = 2 time slots = 17.6 sec

010 = 3 time slots = 11.8 sec

011 = 5 time slots = 7 sec

100 = 8 time slots = 4.4 sec

101 = 12 time slots = 3 sec

110 = 24 time slots = 1.6 sec

111 = 48 time slots = 0.8 sec

Another way to view the ramp rates is as the time it takes for

the PWM output to ramp up from 0% to 100% duty cycle for an

instantaneous change in temperature. This can be tested by

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