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參數資料
| 型號： | ADT7463 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | dB COOL Remote Thermal Controller and Voltage Monitor |
| 中文描述： | 分貝超酷的遠程熱控制器和電壓監視器 |
| 文件頁數： | 20/53頁 |
| 文件大小： | 719K |
| 代理商： | ADT7463 |
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REV. 0
–20–
ADT7463
OOL = 1 DENOTES A PARAMETER
MONITORED THROUGH STATUS REG 2
IS OUT-OF-LIMIT
Figure 21. Status Register 1
Status Register 1 (Reg. 0x41)
Bit 7 (OOL) = 1,
denotes a bit in Status Register 2 is set and
Status Register 2 should be read.
Bit 6 (R2T) = 1,
Remote 2 Temp High or Low Limit has been
exceeded.
Bit 5 (LT) = 1,
Local Temp High or Low Limit has been
exceeded.
Bit 4 (R1T) = 1,
Remote 1 Temp High or Low Limit has been
exceeded.
Bit 3 (5 V) = 1,
5 V High or Low Limit has been exceeded.
Bit 2 (V
CC
) = 1,
V
CC
High or Low Limit has been exceeded.
Bit 1 (V
CCP
) = 1,
V
CCP
High or Low Limit has been exceeded.
Bit 0 (2.5 V) = 1,
2.5 V High or Low Limit has been exceeded.
F4P = 1, FAN4 OR
THERM
TIMER IS OUT-OF-LIMIT
Figure 22. Status Register 2
Status Register 2 (Reg. 0x42)
Bit 7 (D2) = 1,
indicates an open or short on D2+/D2– inputs.
Bit 6 (D1) = 1,
indicates an open or short on D2+/D2– inputs.
Bit 5 (F4P) = 1,
indicates Fan 4 has dropped below minimum
speed. Alternatively, indicates that
THERM
limit has been
exceeded if the
THERM
function is used.
Bit 4 (FAN3) = 1,
indicates Fan 3 has dropped below mini-
mum speed.
Bit 3 (FAN2) = 1,
indicates Fan 2 has dropped below mini-
mum speed.
Bit 2 (FAN1) = 1,
indicates Fan 1 has dropped below mini-
mum speed.
Bit 1 (OVT) = 1,
indicates that a
THERM
overtemperature
limit has been exceeded.
Bit 0 (12V/VC) = 1,
12 V High or Low Limit has been
exceeded. If the VID Code change function is used, this bit
indicates a change in VID Code on the VID0 to VID5 inputs.
SMBALERT
Interrupt Behavior
The ADT7463 can be polled for status, or an
SMBALERT
interrupt can be generated for out-of-limit conditions. It is
important to note how the
SMBALERT
output and status bits
behave when writing Interrupt Handler software.
“STICKY”
STATUS
BIT
HIGH LIMIT
TEMPERATURE
SMBALERT
CLEARED ON READ
(TEMP BELOW LIMIT)
TEMP BACK IN LIMIT
(STATUS BIT STAYS SET)
Figure 23.
SMBALERT
and Status Bit Behavior
Figure 23 shows how the
SMBALERT
output and “sticky”
status bits behave. Once a limit is exceeded, the corresponding
status bit gets set to 1. The status bit remains set until the error
condition subsides and the Status Register gets read. The status
bits are referred to as “sticky” since they remain set until read
by software. This ensures that an out-of-limit event cannot be
missed if software is polling the device periodically. Note that
the
SMBALERT
output remains low for the entire duration
that a reading is out-of-limit and until the Status Register has
been read. This has implications on how software handles the
interrupt.
HANDLING SMBALERT INTERRUPTS
To prevent the system from being tied up servicing interrupts, it
is recommend to handle the
SMBALERT
interrupt as follows:
“ STICKY”
STATUS
BIT
HIGH LIMIT
TEMPERATURE
SMBALERT
CLEARED ON READ
(TEMP BELOW LIMIT)
TEMP BACK IN LIMIT
(STATUS BIT STAYS SET)
INTERRUPT
MASK BIT SET
INTERRUPT MASK BIT
CLEARED
(
SMBALERT
REARMED)
Figure 24. How Masking the Interrupt Source
Affects
SMBALERT
Output
1. Detect the
SMBALERT
assertion.
2. Enter the interrupt handler.
3. Read the Status Registers to identify the interrupt source.
4. Mask the interrupt source by setting the appropriate Mask
bit in the Interrupt Mask Registers (Reg. 0x74, 0x75).
5. Take the appropriate action for a given interrupt source.
6. Exit the Interrupt Handler.
7. Periodically poll the Status Registers. If the interrupt status bit
has cleared, reset the corresponding Interrupt Mask Bit to 0.
This will cause the
SMBALERT
output and status bits to
behave as shown in Figure 24.
Masking Interrupt Sources
Interrupt Mask Registers 1 and 2 are located at Addresses
0x74 and 0x75. These allow individual interrupt sources to
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| ADT7463ARQ | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 標準包裝:1 系列:- 功能:溫度監控系統（傳感器） 傳感器類型:內部和外部 感應溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
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