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參數(shù)資料
| 型號(hào)： | LM92 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 【0.33∑C Accurate, 12-Bit Sign Temperature Sensor and Thermal Window Comparator with Two-Wire Interface |
| 中文描述： | 【0.33ΣC準(zhǔn)確，12位注冊(cè)溫度傳感器和熱窗口比較器的兩線接口 |
| 文件頁(yè)數(shù)： | 10/18頁(yè) |
| 文件大?。?/td> | 396K |
| 代理商： | LM92 |
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1.0 Functional Description
(Continued)
The maximum resistance of the pull up, based on LM92
specification for High Level Output Current, to provide a 2
volt high level, is 30K ohms.
1.7 FAULT QUEUE
A fault queue of 4 faults is provided to prevent false tripping
when the LM92 is used in noisy environments. The 4 faults
must occur consecutively to set flags as well as INT and
T_CRIT_A outputs. The fault queue is enabled by setting bit
4 of the Configuration Register high (see Section 1.11).
1.8 INTERNAL REGISTER STRUCTURE
There are four data registers in the LM92, selected by the
Pointer register.At power-up the Pointer is set to “00”; the lo-
cation for the Temperature Register. The Pointer register
latches the last location it was set to. In Interrupt Mode, a
read from the LM92 resets the INT output. Placing the device
in Shutdown mode resets the INT and T_CRIT_Aoutputs.All
registers are read and write, except the Temperature register
which is read only.
A write to the LM92 will always include the address byte and
the Pointer byte. A write to the Configuration register re-
quires one data byte, while the T
LOW
, T
HIGH
, and T_CRIT
registers require two data bytes.
Reading the LM92 can take place either of two ways: If the
location latched in the Pointer is correct (most of the time it is
expected that the Pointer will point to the Temperature regis-
ter because it will be the data most frequently read from the
LM92), then the read can simply consist of an address byte,
followed by retrieving the corresponding number of data
bytes. If the Pointer needs to be set, then an address byte,
pointer byte, repeat start, and another address byte plus re-
quired number of data bytes will accomplish a read.
The first data byte is the most significant byte with most sig-
nificant bit first, permitting only as much data as necessary to
be read to determine the temperature condition. For in-
stance, if the first four bits of the temperature data indicates
a critical condition, the host processor could immediately
take action to remedy the excessive temperature. At the end
of a read, the LM92 can accept either Acknowledge or No
Acknowledge from the Master (No Acknowledge is typically
used as a signal for the slave that the Master has read its
last byte).
An inadvertent 8-bit read from a 16-bit register, with the D7
bit low, can cause the LM92 to stop in a state where the SDA
line is held low as shown in Figure 4 This can prevent any
further bus communication until at least 9 additional clock
cycles have occurred. Alternatively, the master can issue
clock cycles until SDA goes high, at which time issuing a
“Stop” condition will reset the LM92.
DS101051-7
L
www.national.com
10
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| LM92_05 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:【0.33∑C Accurate, 12-Bit + Sign Temperature Sensor and Thermal Window Comparator with Two-Wire Interface |
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