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參數(shù)資料
| 型號： | LM95221CIMM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Dual Remote Diode Digital Temperature Sensor with SMBus Interface |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 3Cel, SQUARE, SURFACE MOUNT |
| 封裝： | MO-187, MSOP-8 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大小： | 282K |
| 代理商： | LM95221CIMM |
1.0 Functional Description
(Continued)
7.
8.
Status Register: busy, diode fault
Configuration Register: resolution control, conversion
rate control, standby control
1-shot Register
10. Manufacturer ID
11. Revision ID
9.
1.1 CONVERSION SEQUENCE
The LM95221 takes approximately 66 ms to convert the
Local Temperature, Remote Temperature 1 and 2, and to
update all of its registers. Only during the conversion pro-
cess the busy bit (D7) in the Status register (02h) is high.
These conversions are addressed in a round robin se-
quence. The conversion rate may be modified by the Con-
version Rate bits found in the Configuration Register (03h).
When the conversion rate is modified a delay is inserted
between conversions, the actual conversion time remains at
66ms (26 ms for each remote and 14 ms for local). Different
conversion rates will cause the LM95221 to draw different
amounts of supply current as shown in
Figure 2
.
1.2 POWER-ON-DEFAULT STATES
LM95221 always powers up to these known default states.
The LM95221 remains in these states until after the first
conversion.
1.
Command Register set to 00h
2.
Local Temperature set to 0C
3.
Remote Diode Temperature set to 0C until the end of
the first conversion
4.
Status Register depends on state of thermal diode in-
puts
5.
Configuration register set to 00h; continuous conversion,
time = 66ms
1.3 SMBus INTERFACE
The LM95221 operates as a slave on the SMBus, so the
SMBCLK line is an input and the SMBDAT line is bidirec-
tional. The LM95221 never drives the SMBCLK line and it
does not support clock stretching. According to SMBus
specifications, the LM95221 has a 7-bit slave address. All
bitsA6 throughA0 are internally programmed and can not be
changed by software or hardware. The LM95221 has the
following SMBus slave address:
Version
LM95221
A6
0
A5
1
A4
0
A3
1
A2
0
A1
1
A0
1
1.4 TEMPERATURE DATA FORMAT
Temperature data can only be read from the Local and
Remote Temperature registers .
Remote temperature data is represented by an 11-bit, two’s
complement word or unsigned binary word with an LSb
(Least Significant Bit) equal to 0.125C. The data format is a
left justified 16-bit word available in two 8-bit registers. Un-
used bits will always report "0".
11-bit, 2’s complement (10-bit plus sign)
Temperature
Digital Output
Binary
0111 1101 0000 0000
0001 1001 0000 0000
0000 0001 0000 0000
0000 0000 0010 0000
0000 0000 0000 0000
1111 1111 1110 0000
1111 1111 0000 0000
1110 0111 0000 0000
1100 1001 0000 0000
Hex
7D00h
1900h
0100h
0020h
0000h
FFE0h
FF00h
E700h
C900h
+125C
+25C
+1C
+0.125C
0C
0.125C
1C
25C
55C
11-bit, unsigned binary
Temperature
Digital Output
Binary
1111 1111 1110 0000
1111 1111 0000 0000
1100 1001 0000 0000
0111 1101 0000 0000
0001 1001 0000 0000
0000 0001 0000 0000
0000 0000 0010 0000
0000 0000 0000 0000
Hex
FFE0h
FF00h
C900h
7D00h
1900h
0100h
0020h
0000h
+255.875C
+255C
+201C
+125C
+25C
+1C
+0.125C
0C
Local Temperature data is represented by a 10-bit, two’s
complement word with an LSb (Least Significant Bit) equal to
0.25C. The data format is a left justified 16-bit word avail-
able in two 8-bit registers. Unused bits will always report "0".
Local temperature readings greater than +127.875C are not
clamped to +127.875C, they will roll-over to negative tem-
perature readings.
Temperature
Digital Output
Binary
0111 1101 0000 0000
0001 1001 0000 0000
0000 0001 0000 0000
0000 0000 0010 0000
0000 0000 0000 0000
Hex
7D00h
1900h
0100h
0020h
0000h
+125C
+25C
+1C
+0.125C
0C
20094306
FIGURE 2. Conversion Rate Effect on Power Supply
Current
L
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| LM95221CIMM/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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
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