Datasheet > SM5852-003-A-5-N

SM5852-003-A-5-N

更新时间： 2022-12-18 02:56:42

品牌	Logo	应用领域
其他 - ETC		传感器压力传感器
页数	文件大小	规格书
4页	216K
描述
Amplified Pressure Sensor

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SM5852-003-A-5-N 数据手册

SM5812/SM5852

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.

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

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.

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 I²C digital interface.

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

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.

SMI Multi-Order Pressure and

+ 5 VDC

Temperature Correction ASIC

+ 5 VDC

Band-gap

External

Piezoresistive

Temp

Bridge

DSP

(multi-order

correction of

pressure and

temperature

non-

12-bit

Sigma-

Switched

MUX

11-bit ADC

Capacitor

Delta DAC

Ground

Integrateing

Amplifier

linearities)

Analog

Output

Buffer

Analog

Output

Power-On

Timing

Reset

EEPROM

Array

Control

Digital Timing

and Control

Management

SDA

SCL

2 MHz

I C Digital

Oscillator

Interface

Analog Component

Digital Component

Ground

Rev 1.4 6_05

 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

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