參數(shù)資料
型號(hào): LM90
廠商: National Semiconductor Corporation
元件分類(lèi): 溫度/濕度傳感器
英文描述: 3 Degree Celcious Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface
中文描述: 3度Celcious精確,遠(yuǎn)程二極管和本地?cái)?shù)字溫度傳感器兩線接口
文件頁(yè)數(shù): 11/20頁(yè)
文件大?。?/td> 384K
代理商: LM90
1.0 Functional Description
(Continued)
1.9.1 SMBus Timing Diagrams
1.10 SERIAL INTERFACE RESET
In the event that the SMBus Master is RESET while the
LM90 is transmitting on the SMBData line, the LM90 must be
returned to a known state in the communication protocol.
This may be done in one of two ways:
1.
When SMBData is LOW, the LM90 SMBus state ma-
chine resets to the SMBus idle state if either SMBData
or SMBCLK are held low for more than 35ms (t
).
Note that according to SMBus specification 2.0 all de-
vices are to timeout when either the SMBCLK or SMB-
Data lines are held low for 25-35ms. Therefore, to insure
a timeout of all devices on the bus the SMBCLK or
SMBData lines must be held low for at least 35ms.
2.
When SMBData is HIGH, have the master initiate an
SMBus start. The LM90 will respond properly to an
SMBus start condition at any point during the communi-
cation. After the start the LM90 will expect an SMBus
Address address byte.
1.11 DIGITAL FILTER
In order to suppress erroneous remote temperature readings
due to noise, the LM90 incorporates a user-configured digital
filter. The filter is accessed in the FILTER and ALERT CON-
FIGURE REGISTER at BFh. The filter can be set according
to the following table.
20033710
(a) Serial Bus Write to the internal Command Register followed by a the Data Byte
20033711
(b) Serial Bus Write to the Internal Command Register
20033712
(c) Serial Bus Read from a Register with the Internal Command Register preset to desired value.
FIGURE 7. SMBus Timing Diagrams
L
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11
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