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)： 39/88頁(yè)
文件大?。?/td> 836K
代理商： ADT7462ACPZ-500RL7
ADT7462
Rev. 2 | Page 44 of 88 | www.onsemi.com
TEMPERATURE ABOVE TMIN
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TEMPERATURE ABOVE TMIN
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05569-
051
Figure 63. TRANGE and % Fan Speed Slopes for VRM, Ambient,
and CPU Temperature Channels
STEP 6—T
THERM FOR TEMPERATURE CHANNELS
TTHERM is the absolute maximum temperature allowed on a
temperature channel. Above this temperature, a component
such as the CPU or VRM might be operating beyond its safe
operating limit. When the measured temperature exceeds
TTHERM, all fans are driven at 100% PWM duty cycle (full speed)
to provide critical system cooling. The fans remain running at
100% until the temperature drops below TTHERM minus hysteresis,
where hysteresis is the number programmed into Local/Remote 1
Hysteresis Register 0x54 and Remote 2/Remote 3 Hysteresis
Register 0x55. The default hysteresis value is 4°C.
The TTHERM limit should be considered as the maximum worst-
case operating temperature of the system. Because exceeding
any TTHERM limit runs all fans at 100%, it has very negative
acoustic effects. Ultimately, this limit should be set up as a fail-
safe, and it must not be exceeded under normal system
operating conditions.
Note that the TTHERM limits cannot be masked, and they affect
the fan speed no matter how the automatic fan control settings
are configured. This allows some flexibility because a TRANGE
value can be selected based on its slope, while a hard limit (such
as 70°C), can be programmed as TMAX (the temperature at
which the fan reaches full speed) by setting TTHERM to that limit
(for example, 70°C).
THERM Registers
Register 0x4C, Local THERM1 temperature limit = 0xA4
(100°C default)
Register 0x4D, Remote 1 THERM1 temperature limit = 0xA4
(100°C default)
Register 0x4E, Remote 2 THERM1 temperature limit = 0xA4
(100°C default)
Register 0x4F Remote 3 THERM1 temperature limit = 0xA4
(100°C default)
Register 0x50, Local THERM2 temperature limit = 0xA4
(100°C default)
Register 0x51, Remote 1 THERM2 temperature limit = 0xA4
(100°C default)
Register 0x52, Remote 2 THERM2 temperature limit = 0xA4
(100°C default)
Register 0x53 Remote 3 THERM2 temperature limit = 0xA4
(100°C default)
Hysteresis Registers
Register 0x54, Local/Remote 1 Temperature
Hysteresis Register
Bits [7:4], local temperature hysteresis (4°C default)
Bits [3:0], Remote 1 temperature hysteresis (4°C default)
Register 0x55, Remote 2/Remote 3 Temperature
Hysteresis Register
Bits [7:4], Remote 2 temperature hysteresis (4°C default)
Bits [3:0], Remote 3 temperature hysteresis (4°C default)
Because each hysteresis setting is four bits, hysteresis values are
programmable from 1°C to 15°C. It is not recommended that
hysteresis values ever be programmed to 0°C, because this value
disables hysteresis. In effect, this value causes the fans to cycle
between normal speed and 100% speed, creating unsettling
acoustic noise.
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