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參數(shù)資料
| 型號(hào)： | LM95241CIMM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Dual Remote Diode Temperature Sensor with SMBus Interface and TruTherm⑩ Technology (65nm/90nm) |
| 中文描述： | DIGITAL TEMP SENSOR-DUAL TRIP POINT |
| 封裝： | MO-187, MSOP-8 |
| 文件頁數(shù)： | 8/19頁 |
| 文件大?。?/td> | 708K |
| 代理商： | LM95241CIMM |
1.0 Functional Description
(Continued)
the remote diodes to sense temperatures above 127C.
Local temperature resolution is not programmable and is
always 9-bits plus sign and has a 0.25C LSb.
The LM95241 remote diode temperature accuracy is
trimmed for the typical thermal diode of a Intel processor on
65nm or 90nm process or a typical 2N3904 transistor and
the accuracy is guaranteed only when using either of these
diodes when selected appropriately. TruTherm mode should
be enabled when measuring a Intel processor on 65nm or
90nm process and disabled when measuring a 3904 transis-
tor.
Diode fault detection circuitry in the LM95241 can detect the
presence of a remote diode.
The LM95241 register set has an 8-bit data structure and
includes:
1.
Most-Significant-Byte (MSB) Local Temperature Regis-
ter
2.
Least-Significant-Byte (LSB) Local Temperature Regis-
ter
3.
MSB Remote Temperature 1 Register
4.
LSB Remote Temperature 1 Register
5.
MSB Remote Temperature 2 Register
6.
LSB Remote Temperature 2 Register
7.
Status Register: busy, diode fault
8.
Configuration Register: resolution control, conversion
rate control, standby control
9.
Remote Diode Filter Setting
10. Remote Diode Model Select
11. Remote Diode TruTherm Mode Control
12. 1-shot Register
13. Manufacturer ID
14. Revision ID
1.1 CONVERSION SEQUENCE
In the power up default state the LM95241 typically takes
77.8 ms to convert the Local Temperature, Remote Tem-
perature 1 and 2, and to update all of its registers. Only
during the conversion process is the busy bit (D7) in the
Status register (02h) high. These conversions are addressed
in a round robin sequence. The conversion rate may be
modified by the Conversion Rate bits found in the Configu-
ration Register (03h). When the conversion rate is modified a
delay is inserted between conversions, the actual maximum
conversion time remains at 88.9 ms. Different conversion
rates will cause the LM95241 to draw different amounts of
supply current as shown in
Figure 1
.
1.2 POWER-ON-DEFAULT STATES
LM95241 always powers up to these known default states.
The LM95241 remains in these states until after the first
conversion.
1.
Command Register set to 00h
2.
Local Temperature set to 0C until the end of the first
conversion
3.
Remote Diode Temperature set to 0C until the end of
the first conversion
4.
Remote Diode digital filters are on.
5.
Remote Diode 1 model is set to Intel processor on 65nm
or 90nm process with TruTherm Mode enabled. Remote
Diode 2 model is set to 2N3904/MMBT3904 with TruTh-
erm mode disabled.
6.
Status Register depends on state of thermal diode in-
puts
7.
Configuration register set to 00h; continuous conversion
1.3 SMBus INTERFACE
The LM95241 operates as a slave on the SMBus, so the
SMBCLK line is an input and the SMBDAT line is bidirec-
tional. The LM95241 never drives the SMBCLK line and it
does not support clock stretching. According to SMBus
specifications, the LM95241 has a 7-bit slave address. All
bits A6 through A0 are internally programmed and cannot be
changed by software or hardware. The SMBus slave ad-
dress is dependent on the LM95241 part number ordered:
Version
LM95241CIMM
LM95241CIMM-1
LM95241CIMM-2
A6
0
0
0
A5
1
0
1
A4
0
1
0
A3
1
1
1
A2
0
0
0
A1 A0
1
0
1
1
1
0
1.4 TEMPERATURE DATA FORMAT
Temperature data can only be read from the Local and
Remote Temperature registers .
Remote temperature data with the digital filter off is repre-
sented by an 11-bit, two’s complement word or unsigned
binary word with an LSb (Least Significant Bit) equal to
20199706
FIGURE 1. Conversion Rate Effect on Power Supply
Current
L
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8
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM95241CIMM/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 |
| LM95241CIMM-1 | 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 |
| LM95241CIMM-1/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 |
| LM95241CIMM-2 | 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 |
| LM95241CIMM-2/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 |
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