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參數(shù)資料
| 型號： | MPX2000 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Pressure Sensor(壓力傳感器) |
| 中文描述： | 壓力傳感器（壓力傳感器） |
| 文件頁數(shù)： | 5/6頁 |
| 文件大?。?/td> | 109K |
| 代理商： | MPX2000 |
5
Motorola Sensor Device Data
When the tolerance of the system has to be in the range of
±
1%, the designer should provide only one calibration
procedure which sets the Full Scale Output (counts) at 25
°
C
100 kPa or under the local atmospheric pressure conditions.
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PRESSURE
SENSOR
SYSTEM
MPX2100AP
MC74HC4053
1/3
MC74HC4053
V1
V2
R
f
R
g
R
f
+ 5 V
0 V
I/O
MC68HC05B6
P1
CH1
P2
VRL
V
SS
VRH
V
DD
+
Figure 11. One Channel Input and Two Output Ports are used by the MCU
Due to the high impedance input of the A/D converter of the
MC68HC05B6 MCU, another configuration may be
implemented which uses only one channel input as shown in
Figure 11. It is interesting to notice that practically any dual op
amp may be used to do the job but a global consideration must
be made to optimize the total cost of the system according the
the requested specification.
When the Full Scale Pressure has to be sent with accuracy,
the calibration procedure may be executed in different ways.
For instance, the module may be calibrated directly using
Up/Down push buttons.
The gain of the chain is set by changing the VRH voltage of
the ratiometric A/D converter with the R/2R ladder network
circuit which is directly drived by the ports of the MCU. (See
Figure 12.)
Using a communication bus, the calibration procedure may
be executed from a host computer. In both cases, the setting
value is stored in the EEROM of the MCU.
The gain may be also set using a potentiometer in place of
the resistor R
f
. But, this component is expensive, taking into
account that it must be stable over the temperature range at
long term.
MC68HC05B6
VRH
P3
P2
P1
CH1
CH2
V
DD
VRL
V
SS
2R
RO
R/2R
LADDER
NETWORK
2R
2R
2R
2R
R
R
R
I/O
+ 5 V
0 V
UP
DOWN
+ 5 V
Figure 12.
P0
BUS
Table 1. Pressure Conversion Table
Unity
Pa
mbar
Torr
atm
at=kp/cm
2
mWS
psi
1 N/m
2
= 1 Pascal
1
0.01
7.5 10
–3
—
—
—
—
1 mbar
100
1
0.75
—
—
0.0102
0.014
1 Torr = 1 mmHg
133.32
1.333
.1
—
—
—
0.019
1 atm (1)
101325
1013.2
760
1
1.033
10.33
14.69
1 at = 1 kp/cm
2
(2)
98066.5
981
735.6
0.97
1
10
14.22
1 m of water
9806.65
98.1
73.56
0.097
0.1
1
1.422
1 lb/sqin = 1 psi
6894.8
68.95
51.71
0.068
—
—
1
(1) Normal atmosphere
(2) Technical atmosphere
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MPX200A | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:0 to 200 kPa (0-29 psi) 60 mV FULL SCALE SPAN (TYPICAL) |
| MPX200AP | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:0 to 200 kPa (0-29 psi) 60 mV FULL SCALE SPAN (TYPICAL) |
| MPX200AS | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:0 to 200 kPa (0-29 psi) 60 mV FULL SCALE SPAN (TYPICAL) |
| MPX200ASX | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:0 to 200 kPa (0-29 psi) 60 mV FULL SCALE SPAN (TYPICAL) |
| MPX200D | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:X-ducer SILICON PRESSURE SENSOR |
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