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MAS6502 数据表(PDF) 14 Page - Micro Analog systems

部件名 MAS6502
功能描述  Piezoresistive Sensor
PDF  20 Pages
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制造商  MAS [Micro Analog systems]
网页  http://www.mas-oy.com
标志 MAS - Micro Analog systems

MAS6502 数据表(HTML) 14 Page - Micro Analog systems

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DA6502.008
29 November 2012
14 (20)
APPLICATION INFORMATION
Input Signal Range Definitions
The input signal voltage polarity is from positive input PI to the negative input NI. MAS6502 has input signal
range (ISR) and offset (OFFSET) selection options that determines the input signal range of the A/D converter.
The minimum and maximum input signal values in the linear input signal range (ISRLIN) are calculated as
follows.
2
_
ISRLIN
OFFSET
V
MIN
IN
−
=
Equation 1.
2
_
ISRLIN
OFFSET
V
MAX
IN
+
=
Equation 2.
Table 11 shows minimum and maximum input signal values in the linear input signal range at different input
signal range and offset selection combinations.
Table 11. Minimum and maximum input signal values in the linear input signal range
OFFSET
ISR
ISRLIN
VIN_MIN
VIN_MAX
[mV]
[mV]
[mV]
[mV]
[mV]
0
325
260
-130
130
33
325
260
-97
163
0
220
176
-88
88
33
220
176
-55
121
0
150
120
-60
60
33
150
120
-27
93
0
100
80
-40
40
33
100
80
-7
73
The digital A/D conversion result, CODE, depends on the input signal as follows.
⋅
−
+
⋅
=
ISR
OFFSET
V
CODE
CODE
IN
MAX
5
.
0
Equation 3.
CODE = digital A/D-conversion output code
CODE MAX = A/D-converter maximum code (minimum code is zero)
See page 4 Electrical Characteristics for CODE MAX values at different over sampling ratio (OSR) selections.
Pressure Measurement Configuration
Piezoresistive absolute pressure sensor can be modeled roughly with following signal voltage characteristic
when including only first order pressure and temperature characteristics..
(
)
(
)
(
)
(
)
(
)
−
⋅
+
⋅
+
⋅
−
⋅
+
⋅
⋅
=
REF
OS
FS
REF
FS
REF
IN
T
T
TC
OS
p
p
T
T
TC
FS
VDD
VDD
T
p
V
1
1
,
Equation 4.
VDD = supply voltage
VDDREF = reference supply voltage at which the sensor parameters (FS, OS) have been specified (often 5V)
p = pressure [bar]
pFS = full-scale pressure range [bar]
FS = full-scale span [V]
OS = zero pressure offset [V]
TCFS = full-scale span temperature coefficient [ppm/°C]
TCOS = offset temperature coefficient [ppm/°C]
TREF = reference temperature for resistor values [°C]
T = actual temperature to be measured [°C]
The above linear approximation includes sensor full-scale span and offset signal temperature dependencies.



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