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參數資料
型號: ADT7466
廠商: Analog Devices, Inc.
英文描述: dBCool Remote Thermal Controller and Voltage Monitor
中文描述: dBCool遠程熱控制器和電壓監視器
文件頁數: 24/48頁
文件大小: 1269K
代理商: ADT7466
ADT7466
Measuring PROCHOT Assertion Time
Rev. 0 | Page 24 of 48
The ADT7466 has an internal timer to measure PROCHOT
assertion time. The timer is started on the assertion of the
ADT7466 PROCHOT input, and stopped on the negation of
the pin. The timer counts PROCHOT times cumulatively, that
is, the timer resumes counting on the next PROCHOT
assertion. The PROCHOT timer continues to accumulate
PROCHOT assertion times until the timer is read (it is cleared
on read) or until it reaches full scale. If the counter reaches full
scale, it stops at that reading until it is cleared.
The 8-bit PROCHOT timer register (0x0F) is designed such
that Bit 0 is set to 1 on the first PROCHOT assertion. Once the
cumulative PROCHOT assertion time exceeds 50 ms, Bit 1 of
the PROCHOT timer is set, and Bit 0 becomes the LSB of the
timer with a resolution of 22.76 ms.
0
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 1
PROCHOT
PROCHOT
TIMER
(REG. 0x0F)
PROCHOT ASSERTED < OR = 25ms
PROCHOT
ACCUMULATE PROCHOT LOW
ASSERTION TIMES
7 6 5 4 3 2 1 0
0 0 0 0 0 0 1 0
PROCHOT
TIMER
(REG. 0x0F)
PROCHOT ASSERTED > OR = 50ms
PROCHOT
ACCUMULATE PROCHOT LOW
ASSERTION TIMES
7 6 5 4 3 2 1 0
0 0 0 0 0 1 0 1
PROCHOT
TIMER
(REG. 0x0F)
PROCHOT ASSERTED > OR = 125ms
(100ms + 25ms)
Figure 30. PROCHOT Timer
Figure 30 shows how the PROCHOT timer behaves as the
PROCHOT input is asserted and negated. Bit 0 is set on the first
PROCHOT assertion that is detected. This bit remains set until
the cumulative PROCHOT assertions exceed 50 ms. At this
time, Bit 1 of the PROCHOT timer is set, and Bit 0 is cleared.
Bit 0 now reflects timer readings with a resolution of 25 ms.
When using the PROCHOT timer, be aware of the following.
After a PROCHOT timer read (0x0F):
The contents of the timer are cleared on read.
The PHOT bit (Bit 1) of Status Register 2 is cleared
automatically.
If the PROCHOT timer is read during a PROCHOT assertion,
the following happens:
The contents of the timer are cleared.
Bit 0 of the PROCHOT timer is set to 1 (since a
PROCHOT assertion is occurring).
The PROCHOT timer increments from 0.
If the PROCHOT limit (0x1E) = 0x00, the PHOT bit is set.
Generating ALERT Interrupts from PROCHOT Events
The ADT7466 can generate ALERTs when a programmable
PROCHOT limit is exceeded. This allows the systems designer
to ignore brief, infrequent PROCHOT assertions, while
capturing longer PROCHOT events that could signify a more
serious thermal problem within the system. Register 0x1E is the
PROCHOT limit register. This 8-bit register allows a limit from
0 seconds (first PROCHOT assertion) to 6.4 seconds to be set
before an ALERT is generated. The PROCHOT timer value is
compared with the contents of the PROCHOT limit register. If
the PROCHOT timer value exceeds the PROCHOT limit value,
the PHOT bit (Bit 1) of Status Register 2 is set, and an ALERT is
generated. The PHOT bit (Bit 1) of Mask Register 2 (0x13)
masks ALERTs if this bit is set to 1, although the PHOT bit of
Interrupt Status Register 2 is still set if the PROCHOT limit is
exceeded.
Figure 32 is a functional block diagram of the PROCHOT timer
limit and associated circuitry. Writing a value of 0x00 to the
PROCHOT limit register (0x21) causes ALERT to be generated
on the first PROCHOT assertion. A PROCHOT limit value of
0x01 generates an ALERT when cumulative PROCHOT
assertions exceed 50 ms.
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參數描述
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ADT7466ARQZ-RL7 功能描述:板上安裝溫度傳感器 RMT THRM CTR VLT MON RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor
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