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ADT7473 Datasheet(PDF) 53 Page - Analog Devices |
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ADT7473 Datasheet(HTML) 53 Page - Analog Devices |
53 / 76 page ADT7473 Rev. A | Page 53 of 76 Enabling the THERM Trip Point as the Oper Bits [4:2] of Dynamic ating Point TMIN Control Register 1 (0x36) enable/disable THERM monitoring to program the operating point. Dynamic TMIN Control Register 1 (0x36) Bit [4] PHTR2 = 1, copies the Remote 2 current temperature to the Remote 2 operating point register, if THERM is asserted. ture at which THERM The operating point contains the tempera ossible with mance. PHT is asserted. This allows the system to run as quietly as p out affecting system perfor R2 = 0, ignores any THERM assertions. The Remote 2 oper rogrammed value. Bit [3] P l current temperature to the loca t register if THERM ating point register reflects its p HTL = 1, copies the loca l temperature operating poin is asse ntains the temperature at which THE rted. The operating point co RM is asserted. This allows the system to run as quietly as poss erformance. ible without affecting system p PHTL = 0, ignores any THERM assertions. The local rammed valu Bit [ ote 1 current temperature to the R ter if THERM temperature operating point register reflects its prog e. 2] PHTR1 = 1, copies the Rem emote 1 operating point regis is asserted. The e temperature at which THERM operating point contains th is as to run as quietly as possible with nce. PHT serted. This allows the system out affecting system performa R1 = 0, ignores any THERM assertions. The Remote 1 oper rogrammed value. Bits ontrol Register 1 (0x36) enab ol on the temperature chan Dynamic TMIN Control Register 1 (0x36) Bit [7] R2T = 1, enables 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 Automatic Fan Control Overview section. Bit [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 Automatic Fan Control Overview section. Bit [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. ENHANCING SYSTEM ACOUSTICS Automatic fan speed control mode reacts instantaneously to changes in temperature; that is, the PWM duty cycle responds immediately to temperature change. Any impulses in temperature can cause an impulse in fan noise. For psycho- acoustic reasons, the ADT7473 can prevent the PWM output from reacting instantaneously to temperature changes. Enhanced acoustic mode controls the maximum change in PWM duty cycle at a given time. The objective is to prevent the fan from cycling up and down, annoying the user. Acoustic Enhancement Mode Overview Figure 71 gives a top-level overview of the automatic fan control circuitry on the ADT7473 and shows where acoustic enhance- ment fits in. Acoustic enhancement is intended as a postdesign tweak made by a system or mechanical engineer evaluating best settings for the system. Having determined the optimal settings for the thermal solution, the engineer can adjust the system acoustics. The goal is to implement a system that is acoustically pleasing without causing user annoyance due to fan cycling. It is important to realize that although a system might pass an acoustic noise requirement specification (for example, 36 dB), if the fan is annoying, it fails the consumer test. ating point register reflects its p Enabling Dynamic TMIN Control Mode [7:5] of the Dynamic TMIN C le/disable dynamic TMIN contr nels. |
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