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参数资料
| 型号： | LMP91000SDE |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| 封装： | LLP-14 |
| 文件页数： | 4/24页 |
| 文件大小： | 696K |
| 代理商： | LMP91000SDE |
The Internal zero is provided through an internal voltage di-
vider (Vref divider box in Figure 2). The divider is programmed
through the I2C interface.
Temperature sensor
The embedded temperature sensor can be switched off dur-
ing gas concentration measurement to save power. The tem-
perature measurement is triggered through the I2C interface.
The temperature output is available at the VOUT pin until the
configuration bit is reset. The output signal of the temperature
sensor is a voltage, referred to the ground of the LMP91000
(AGND).
Temperature Sensor Transfer Table
Temperature
(°C)
Output
Voltage
(mV)
Temperature
(°C)
Output
Voltage
(mV)
-40
1875
23
1375
-39
1867
24
1367
-38
1860
25
1359
-37
1852
26
1351
-36
1844
27
1342
-35
1836
28
1334
-34
1828
29
1326
-33
1821
30
1318
-32
1813
31
1310
-31
1805
32
1302
-30
1797
33
1293
-29
1789
34
1285
-28
1782
35
1277
-27
1774
36
1269
-26
1766
37
1261
-25
1758
38
1253
-24
1750
39
1244
-23
1742
40
1236
-22
1734
41
1228
-21
1727
42
1220
-20
1719
43
1212
-19
1711
44
1203
-18
1703
45
1195
-17
1695
46
1187
-16
1687
47
1179
-15
1679
48
1170
-14
1671
49
1162
-13
1663
50
1154
-12
1656
51
1146
-11
1648
52
1137
-10
1640
53
1129
-9
1632
54
1121
-8
1624
55
1112
-7
1616
56
1104
-6
1608
57
1096
-5
1600
58
1087
-4
1592
59
1079
-3
1584
60
1071
-2
1576
61
1063
-1
1568
62
1054
0
1560
63
1046
1
1552
64
1038
2
1544
65
1029
3
1536
66
1021
4
1528
67
1012
5
1520
68
1004
6
1512
69
996
7
1504
70
987
8
1496
71
979
9
1488
72
971
10
1480
73
962
11
1472
74
954
12
1464
75
945
13
1456
76
937
14
1448
77
929
15
1440
78
920
16
1432
79
912
17
1424
80
903
18
1415
81
895
19
1407
82
886
20
1399
83
878
21
1391
84
870
22
1383
85
861
Although the temperature sensor is very linear, its response
does have a slight downward parabolic shape. This shape is
very accurately reflected in the temperature sensor Transfer
Table. For a linear approximation, a line can easily be calcu-
lated over the desired temperature range from the Table using
the two-point equation:
V-V
1=((V2–V1)/(T2–T1))*(T-T1)
Where V is in mV, T is in °C, T
1 and V1 are the coordinates of
the lowest temperature, T
2 and V2 are the coordinates of the
highest temperature.
For example, if we want to determine the equation of a line
over a temperature range of 20°C to 50°C, we would proceed
as follows:
V-1399mV=((1154mV - 1399mV)/(50°C -20°C))*(T-20°C)
V-1399mV= -8.16mV/°C*(T-20°C)
V=(-8.16mV/°C)*T+1562.2mV
Using this method of linear approximation, the transfer func-
tion can be approximated for one or more temperature ranges
of interest.
I2C INTERFACE
The I2C compatible interface operates in Standard mode
(100kHz). Pull-up resistors or current sources are required on
the SCL and SDA pins to pull them high when they are not
being driven low. A logic zero is transmitted by driving the
output low. A logic high is transmitted by releasing the output
and allowing it to be pulled-up externally. The appropriate
pull-up resistor values will depend upon the total bus capac-
itance and operating speed. The LMP91000 comes with a 7
bit bus fixed address: 1001 000.
www.national.com
12
LMP91000
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMP91000SDE/NOPB | 功能描述:空气质量传感器 RoHS:否 制造商:GE M&C / Telaire 类型:CO2 Module 检测灵敏度: 工作电源电压:5 V 最大工作温度:+ 50 C 最小工作温度:0 C |
| LMP91000SDEVAL | 制造商:Texas Instruments 功能描述: |
| LMP91000SDEVAL/NOPB | 功能描述:多功能传感器开发工具 GAS SENSOR AFE EVAL BOARDLMP91 RoHS:否 制造商:Texas Instruments 工具用于评估:LMP91200 接口类型:SPI 工作电压:1.8 V to 5.5 V 最大工作温度: |
| LMP91000SDX | 制造商:TI 制造商全称:Texas Instruments 功能描述:Sensor AFE System: Configurable AFE Potentiostat for Low-Power Chemical Sensing Applications |
| LMP91000SDX/NOPB | 功能描述:空气质量传感器 RoHS:否 制造商:GE M&C / Telaire 类型:CO2 Module 检测灵敏度: 工作电源电压:5 V 最大工作温度:+ 50 C 最小工作温度:0 C |
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