參數(shù)資料
型號(hào)： ADT7473ARQZ-1REEL7
廠商： ANALOG DEVICES INC
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT
封裝： ROHS COMPLIANT, MO-137AB, QSOP-16
文件頁(yè)數(shù)： 17/72頁(yè)
文件大?。?/td> 1494K
代理商： ADT7473ARQZ-1REEL7
ADT7473/ADT7473-1
Rev. C | Page 24 of 72
Configuring the THERM Behavior
1.
Configure Pin 9 as a THERM timer input.
Setting Bit 1 (THERM timer enable) of Configuration
Register 3 (0x78) enables the THERM timer monitoring
functionality. This is disabled on Pin 9 by default.
Setting Bit 0 and Bit 1 (PIN9FUNC) of Configuration
Register 4 (0x7D) enables THERM timer/output function-
ality on Pin 9 (Bit 1 of Configuration Register 3, THERM,
must also be set). Pin 9 can also be used as TACH4.
Setting Bit 5, Bit 6, and Bit 7 of Configuration Register 5
(0x7C) makes THERM bidirectional. This means that if the
appropriate temperature channel exceeds the THERM
temperature limit, the THERM output asserts. If the
ADT7473 is not pulling THERM low, but THERM is
pulled low by an external device (such as a CPU
overtemperature signal), the THERM timer also times
THERM assertions.
If Bit 5, Bit 6, and Bit 7 of Configuration Register 5 (0x7C)
are set to 0, THERM is set as a timer input only.
2.
Select the desired fan behavior for THERM timer events.
Assuming the fans are running, setting Bit 2 (BOOST) of
Configuration Register 3 (0x78) causes all fans to run at
100% duty cycle whenever THERM is asserted. This allows
fail-safe system cooling. If this bit is 0, the fans run at their
current settings and are not affected by THERM events. If
the fans are not already running when THERM is asserted,
the fans do not run at full speed.
3.
Select whether THERM timer events should generate
SMBALERT interrupts.
Bit 5 (F4P) of Interrupt Mask Register 2 (0x75), when set,
masks out the SMBALERT when the THERM timer limit
value is exceeded. This bit should be cleared if SMBALERT
is based on THERM events required.
4.
Select a suitable THERM limit value.
This value determines whether an SMBALERT is generated
on the first THERM assertion, or only if a cumulative
THERM assertion time limit is exceeded. A value of 0x00
causes an SMBALERT to be generated on the first THERM
assertion.
5.
Select a THERM monitoring time.
This value specifies how often OS or BIOS level software
checks the THERM timer. For example, BIOS could read
the THERM timer once an hour to determine the cumula-
tive THERM assertion time.
If, for example, the total THERM assertion time is
<22.76 ms in Hour 1, >182.08 ms in Hour 2, and >5.825
sec in Hour 3, this can indicate that system performance is
degrading significantly because THERM is asserting more
frequently on an hourly basis.
Alternatively, OS- or BIOS-level software can timestamp when
the system is powered on. If an SMBALERT is generated due to
the THERM timer limit being exceeded, another timestamp can
be taken. The difference in time can be calculated for a fixed
THERM timer limit time. For example, if it takes one week for a
THERM timer limit of 2.914 seconds to be exceeded and the next
time it takes only one hour, this is an indication of a serious
degradation in system performance.
22.76ms
45.52ms
91.04ms
182.08ms
364.16ms
728.32ms
1.457s
2.914s
IN
OUT
RESET
LATCH
CLEARED
ON READ
F4P BIT (BIT 5)
INTERRUPT MASK REGISTER 2
(REGISTER 0x75)
1 = MASK
F4P BIT (BIT 5)
COMPARATOR
22.76ms
45.52ms
91.04ms
182.08ms
364.16ms
728.32ms
1.457s
2.914s
7
6
5
4
3
2
1
0
7 6 543 2 10
THERM
TIMER LIMIT
(REGISTER 0x7A)
THERM TIMER
(REGISTER 0x79)
THERM TIMER CLEARED ON READ
SMBALERT
THERM
0
468
6-
032
INTERRUPT STATUS
REGISTER 2
Figure 35. Functional Block Diagram of the ADT7473 THERM Monitoring Circuitry
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參數(shù)描述
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ADT7473ARQZ-REEL 功能描述:板上安裝溫度傳感器 FAN CNTRLR/INT MON RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
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