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參數(shù)資料
| 型號(hào)： | ADT7462ACPZ-500RL7 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 4Cel, SQUARE, SURFACE MOUNT |
| 封裝： | 5 X 5 MM, LFCSP-32 |
| 文件頁(yè)數(shù)： | 46/88頁(yè) |
| 文件大?。?/td> | 836K |
| 代理商： | ADT7462ACPZ-500RL7 |
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ADT7462
Rev. 2 | Page 50 of 88 | www.onsemi.com
Enabling Dynamic TMIN Control Mode
Bits [1:0] of Dynamic TMIN Control Register 1 (0x0B)
enable/disable dynamic TMIN control on the temperature
channels (see Table 43).
Dynamic TMIN Control Register 1 (0x0B)
Bit 1 (Remote 2 En) = 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.
Bit 1 (Remote 2 En) = 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 0 (Remote 1 En) = 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.
Bit 0 (Remote 1 En) = 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.
STEP 10—MONITORING THERM
Using the operating point limit ensures that the dynamic TMIN
control mode is operating in the best possible acoustic position,
while ensuring that the temperature never exceeds the maxi-
mum operating temperature. Using the operating point limit
allows TMIN to be independent of system-level issues because of
its self-corrective nature. In PC design, the operating point for
the chassis is usually the worst-case internal chassis temperature.
The optimal operating point for the processor is determined by
monitoring the thermal monitor in the Intel Pentium 4 proces-
sor. To do this, the PROCHOT output of the Pentium 4 is
connected to the THERM input of the ADT7462.
The operating point for the processor can be determined by
allowing the current temperature to be copied to the operating
point register when the PROCHOT output pulls the THERM
input low on the ADT7462. This gives the maximum
temperature at which the Pentium 4 can run before clock
modulation occurs.
Enabling the THERM Trip Point as the Operating Point
Bits [5:2] of Dynamic TMIN Control Register 1 (0x0B)
enable/disable THERM monitoring to program the operating
point. Table 43 details how the remote temperatures can be
copied into the operating point registers on a THERM
assertion. Setting these bits to 1 uses the remote temperature as
the operating point temperature, overwriting the programmed
operating point value in the event of a THERM assertion.
Setting these bits to 0 ignores a THERM assertion, and the
operating point register remains at the programmed value.
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 ADT7462 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 75 gives a top-level overview of the automatic fan control
circuitry on the ADT7462 and shows where acoustic enhancement
fits in. Acoustic enhancement is intended as a postdesign tweak
made by a system or mechanical engineer evaluating best set-
tings 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.
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