acceleration sensor spi emulator universitatea “politehnica” din timiŞoara facultatea de...

Acceleration Sensor SPI Emulator

UNIVERSITATEA “POLITEHNICA” DIN TIMIŞOARAFACULTATEA DE ELECTRONICĂ ŞI TELECOMUNICAŢII

DEPARTAMENTUL DE ELECTRONICĂ APLICATĂ

Author: MIHĂILESCU Andrei-Bogdan

Thesis adviser:Associate Professor Ph.D. Eng. JIVEŢ Ioan

TIMIŞOARA2010

© TRW Automotive Inc. 20092

Acknowledgement

The present diploma project has been developed in the period 15th September 2009- 30th June 2010 as a research project in collaboration with “Politehnica” University Timişoara,

„eAustria” Research Institute Timişoara and “BeeSpeed Automatizări” Timişoara (as a subcontractor for TRW, CIAT

department, from Koblenz, Germany).

© TRW Automotive Inc. 20093

Presentation Overview

1. Why this project?

2. Architecture overview

3. Sensor

4. CPLD

5. Microcontroller

6. Big Picture

7. Questions

© TRW Automotive Inc. 20094

Why this project?

1. Title explanation SPI

(Serial Peripheral Interface)

with

2. Target use

© TRW Automotive Inc. 20095

Architecture overview

© TRW Automotive Inc. 20096

Sensor

VTI SCA2120-D07 Accelerometer:

© TRW Automotive Inc. 20097

CPLD

Xilinx XC95288XL CPLD:•6 ns. pin to pin login delay•System frequency up to 208 Mhz•Available in 144 pin TQFP package (easy soldering, even by hand)•Low power operation•5V tolerant I/O pins accept 5V, 3.3 V and 2.5 V signals•In-system programmable•Local clock inversion with 3 global and 1 product-term clocks•Full IEEE Standard 1149.1 boundary scan (JTAG)•6400 usable gates•288 macrocells

© TRW Automotive Inc. 20098

CPLD role

MISO

MOSI

VSC_CLK

CSB

VSCCPLD

Sensor

uC

Data

Sync

CLK_C164

MISOOperation:-Step 1: ‘understand’ request from the VSC-Step 2: see if data is available from the uC or information is to be parsed directly from the sensor-Step 3:send the data to the VSC.

uC-CPLD SPI timing diagram

© TRW Automotive Inc. 20099

uC

uC Board:TQM164C minimodule

uC Role:•ADC port information •CAN (Controller Area Network)•Hardware-in-the-Loop interface•Transmission of simulation valuesTo the CPLD (3-wire SPI)

© TRW Automotive Inc. 200910

uC Role

X_axis

Y_axis

Z_axis

ADC

Input

Data

Sync

CLKTemperature

CAN

ADC information processing:

Acceleration:Voltage range is 0…3.3V.0g value = 1.65 VResolution: 0.59V/g

Temperature:Voltage range is 0… 3.3V23°C value= 1.65 VResolution: 10mV/°C

uC-CPLD SPI timing diagram

Frame D15

D14

D13

D12

D11

D10

D9 D8

D7 D6 D5 D4 D3 D2 D1 D0

X x x 0 0 12bit Data ( Dout15…4)

Y x x 0 1 12bit Data ( Dout15…4)

Z x x 1 0 12bit Data

Temp x x 1 1 x x 10bit Data

© TRW Automotive Inc. 200911

“Big picture”

CPLD uC

ADC interface

Sensor

© TRW Automotive Inc. 200912

Conclusion

TRW Hardware-in-the-Loop System

Circuit capabilities:

-Simulation capabilities of the acceleration sensor

-Analogical input for simulation values thru ADC port;

-Fault injection capabilities

-CAN simulation values injection and debugging (in progress)

-Integration with Hardware-in-the-Loop system for TRW