- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385490 > LM95235 (National Semiconductor Corporation) Precision Remote Diode Temperature Sensor with SMBus Interface and TruTherm Technology PDF資料下載
參數(shù)資料
| 型號： | LM95235 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Precision Remote Diode Temperature Sensor with SMBus Interface and TruTherm Technology |
| 中文描述： | 高精度遠程二極管溫度傳感器，帶有SMBus接口和TruTherm技術(shù) |
| 文件頁數(shù)： | 12/25頁 |
| 文件大?。?/td> | 784K |
| 代理商： | LM95235 |
1.0 Functional Description
(Continued)
1.6 SMBDAT OPEN-DRAIN OUTPUT
The SMBDAT output is an open-drain output and does not
have internal pull-ups. A “high” level will not be observed on
this pin until pull-up current is provided by some external
source, typically a pull-up resistor. Choice of resistor value
depends on many system factors but, in general, the pull-up
resistor should be as large as possible without effecting the
SMBus desired data rate. This will minimize any internal
temperature reading errors due to internal heating of the
LM95235. The maximum resistance of the pull-up to provide
a 2.1V high level, based on LM95235 specification for High
Level Output Current with the supply voltage at 3.0V, is
82 k
(5%) or 88.7 k
(1%).
1.7 T_CRIT OUTPUT AND TCRIT LIMIT
The LM95235’s T_CRIT pin is an active-low open-drain out-
put that is triggered when the local and/or the remote tem-
perature conversion is above the limits defined by the Re-
mote and/or Local Limit registers. The state of the T_CRIT
pin will return to the HIGH state when both the Local and
Remote temperatures are below the values programmed
into the Limit Registers less the value in the Common Hys-
teresis Register. Additionally, if the remote temperature ex-
ceeds the value in the Remote TCRIT Limit Register the
Status Bit for Remote TCRIT (RTCRIT), in Status Register 1,
is set to 1. In the same way if the local temperature exceeds
the value in the Local Shared OS and TCRIT Limit Register
the Status Bit for the Shared Local OS and TCRIT (LOC) bit
in Status Register 1 is set to 1.The T_CRIT output and the
Status Register flags are updated after every Local and
Remote temperature conversion. See
Figure 4
1.8 OS OUTPUT AND OS LIMIT
The LM95235’s OS/A0 pin is selected as an OS digital
output as described in Section 1.3. As an OS pin, it is
activated whenever the local and/or remote temperature
conversion is above the limits defined by the Limit registers.
If the remote temperature exceeds the value in the Remote
OS Limit Register the Status Bit for Remote OS (ROS) in
Status Register 1 is set to 1. In the same way if the local
temperature exceeds the value in the Local Shared OS and
TCRIT Limit Register the Status Bit for the Shared Local OS
and TCRIT (LOC) bit in Status Register 1 is set to 1. The
state of the T_CRIT pin output will return to the HIGH state
when both the Local and Remote temperatures are below
the values programmed into the Limit Registers less the
value in the Common Hysteresis Register. The OS output
and the Status Register flags are updated after every Local
and Remote temperature conversion. See
Figure 5
.
1.9 DIODE FAULT DETECTION
The LM95235 is equipped with operational circuitry designed
to detect fault conditions concerning the remote diodes. In
the event that the D+ pin is detected as shorted to GND, D,
V
or D+ is floating, the Remote Temperature reading is
–128.000 C if signed format is selected and +255.875 C if
unsigned format is selected. In addition, the Status Register
1 bit D2 is set.
1.10 COMMUNICATING with the LM95235
The data registers in the LM95235 are selected by the
Command Register. At power-up the Command Register is
set to “00”, the location for the Read Local Temperature
Register. The Command Register latches the last location it
was set to. Each data register in the LM95235 falls into one
of four types of user accessibility:
1.
Read only
2.
Write only
3.
Write/Read same address
4.
Write/Read different address
A
Write
to the LM95235 will always include the address byte
and the command byte. A write to any register requires one
data byte.
Reading
the LM95235 can take place either of two ways:
1.
If the location latched in the Command Register is cor-
rect (most of the time it is expected that the Command
Register will point to one of the Read Temperature Reg-
isters because that will be the data most frequently read
from the LM95235), then the read can simply consist of
an address byte, followed by retrieving the data byte.
2.
If the Command Register needs to be set, then an
address byte, command byte, repeat start, and another
address byte will accomplish a read.
The data byte has the most significant bit first. At the end of
a read, the LM95235 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). When retrieving all 11 bits from a previous remote
diode temperature measurement, the master must insure
that all 11 bits are from the same temperature conversion.
This may be achieved by reading the MSB register first. The
LSB will be locked after the MSB is read. The LSB will be
unlocked after being read. If the user reads MSBs consecu-
20174913
FIGURE 4. T_CRIT Comparator Temperature Response
Diagram
20174915
FIGURE 5. OS Temperature Response Diagram
L
www.national.com
12
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM95235CIMM | Precision Remote Diode Temperature Sensor with SMBus Interface and TruTherm Technology |
| LM95235CIMMX | Precision Remote Diode Temperature Sensor with SMBus Interface and TruTherm Technology |
| LM95241 | Dual Remote Diode Temperature Sensor with SMBus Interface and TruTherm⑩ Technology (65nm/90nm) |
| LM95241CIMM | Dual Remote Diode Temperature Sensor with SMBus Interface and TruTherm⑩ Technology (65nm/90nm) |
| LM95241CIMM-1 | Dual Remote Diode Temperature Sensor with SMBus Interface and TruTherm⑩ Technology (65nm/90nm) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM95235_08 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Precision Remote Diode Temperature Sensor with SMBus Interface and TruTherm? Technology |
| LM95235CIMM | 功能描述:板上安裝溫度傳感器 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 |
| LM95235CIMM | 制造商:Texas Instruments 功能描述:TEMP SENSE REM DIODE SMD MSOP8 |
| LM95235CIMM/NOPB | 功能描述:板上安裝溫度傳感器 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 |
| LM95235CIMMX | 功能描述:板上安裝溫度傳感器 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。