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SM5852-015-D-3-N Datenblatt(PDF) 2 Page - List of Unclassifed Manufacturers

Teilenummer SM5852-015-D-3-N
Bauteilbeschribung  Amplified Pressure Sensor
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SM5812/SM5852
 2005 SMI
Silicon Microstructures, Inc.
♦ 1701 McCarthy Blvd. ♦ Milpitas, CA 95035 ♦ USA
Tel: 408-577-0100
♦ Fax: 408-577-0123 ♦ Sales@si-micro.com ♦ www.si-micro.com
Rev 1.4 6_05
THEORY OF OPERATION
The operation of the signal processor is
depicted in the block diagram below. The
external pressure sensor is a piezoresistive
bridge. This transduces the applied pressure
into an electronic signal, which is then inputted
into the integrating amplifier of the ASIC.
During the amplification step an offset
correction factor is added in order to allow
maximum gain for a given pressure while
minimizing the offset error.
The signal is then passed to an 11-bit analog
to digital converter (ADC). The ADC samples
the signal multiple times and uses the sum of
those samples as a 13-bit word.
A digital signal processor (DSP) is then used
to correct and calibrate the pressure signal.
The DSP provides multi-order correction of
both pressure and temperature non-linearity
through the use of factory-programmed
coefficients. A combined total of twenty
coefficients are available for correcting
pressure and temperature non-linearity. The
unique coefficients are determined during a
calibration process performed at the factory.
Factory calibration is the last step performed
which means the effect of the package on
the pressure signal will also be taken into
account. This provides a great advantage
over conventional laser-trimming
approaches.
The DSP outputs a corrected digital word,
which travels to a 12-bit digital to analog
converter (DAC) to provide a calibrated
analog output. In addition to the analog
output, the corrected pressure signal is
accessible through an I
2C digital interface.
See SMI application note AN05-001 for a
detailed description of how to read out the
digital corrected pressure signal using the
I2C bus interface.
Switched
Capacitor
Integrateing
Amplifier
Analog
Timing
Control
2 MHz
Oscillator
Power-On
Reset
V
Temp
11-bit ADC
MUX
EEPROM
Array
Band-gap
Output
Buffer
Analog
Output
SDA
SCL
Ground
+ 5 VDC
SMI Multi-Order Pressure and
Temperature Correction ASIC
Analog Component
Digital Component
External
Piezoresistive
Bridge
+ 5 VDC
Ground
DSP
(multi-order
correction of
pressure and
temperature
non-
linearities)
12-bit
Sigma-
Delta DAC
Digital Timing
and Control
Management
I2C Digital
Interface


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