- 您现在的位置：买卖IC网 > PDF目录39250 > LMP91000SDE (NATIONAL SEMICONDUCTOR CORP) SPECIALTY ANALOG CIRCUIT, PDSO14 PDF资料下载
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： | 14/24页 |
| 文件大小： | 696K |
| 代理商： | LMP91000SDE |
POWER CONSUMPTION
The LMP91000 is intended for use in portable devices, so the
power consumption is as low as possible in order to guarantee
a long battery life. The total power consumption for the
LMP91000 is below 10A @ 3.3v average over time, (this
excludes any current drawn from any pin). A typical usage of
the LMP91000 is in a portable gas detector and its power
consumption is summarized in the Power Consumption Sce-
nario table. This has the following assumptions:
-Power On only happens a few times over life, so its power
consumption can be ignored
-Deep Sleep mode is not used
-The system is used about 8 hours a day, and 16 hours a day
it is in Standby mode.
-Temperature Measurement is done about once per minute
This results in an average power consumption of approxi-
mately 7.95 A. This can potentially be further reduced, by
using the Standby mode between gas measurements. It may
even be possible, depending on the sensor used, to go into
deep sleep for some time between measurements, further
reducing the average power consumption.
Power Consumption Scenario
Deep Sleep
StandBy
3-Lead
Amperometric
Cell
Temperature
Measurement
TIA OFF
Temperature
Measurement
TIA ON
Total
Current consumption
(A)
typical value
0.6
6.5
10
11.4
14.9
Time ON
(%)
0
60
39
0
1
Average
(A)
0
3.9
0
0.15
7.95
Notes
A1
OFF
ON
TIA
OFF
ON
OFF
ON
TEMP SENSOR
OFF
ON
I2C interface
ON
SENSOR TEST PROCEDURE
The LMP91000 has all the hardware and programmability
features to implement some test procedures. The purpose of
the test procedure is to:
a) test proper function of the sensor (status of health)
b) test proper connection of the sensor to the LMP91000
The test procedure is very easy. The variable bias block is
user programmable through the digital interface. A step volt-
age can be applied by the end user to the positive input of A1.
As a consequence a transient current will start flowing into the
sensor (to charge its internal capacitance) and it will be de-
tected by the TIA. If the current transient is not detected, either
a sensor fault or a connection problem is present. The slope
and the aspect of the transient response can also be used to
detect sensor aging (for example, a cell that is drying and no
longer efficiently conducts the current). After it is verified that
the sensor is working properly, the LMP91000 needs to be
reset to its original configuration. It is not required to observe
the full transient in order to contain the testing time. All the
needed information are included in the transient slopes (both
edges). Figure 10 shows an example of the test procedure, a
Carbon Monoxide sensor is connected to the LMP91000, two
pulses are then sequentially applied to the bias voltage:
first step: from 0mV to 40mV
second step : from 40mV to -40mV
and finally the bias is set again at 0mV since this is the normal
operation condition for this sensor.
OUTPUTT
VOLTTAGE
(1V/DIV)
TIME (25ms/DIV)
INPUT
PULSE
(100mV/DIV)
LMP91000 OUTPUT
TEST PULSE
30132561
FIGURE 10. TEST PROCEDURE EXAMPLE
21
www.national.com
LMP91000
相关PDF资料 |
PDF描述 |
|---|---|
| LMP91000SDX | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| LMS33460MGX/NOPB | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| LMS33460MWC | 1-CHANNEL POWER SUPPLY SUPPORT CKT, UUC |
| LMS500-5CC | LOW PASS FILTER |
| LMS500-5SS | LOW PASS FILTER |
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 |
发布紧急采购，3分钟左右您将得到回复。