Statement of Work

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25 Νοε 2013 (πριν από 3 χρόνια και 10 μήνες)

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Statement of Work

Data Acquisition Board

(
September 2
5
, 201
3
)


1.

Introduction

/
O
bjective



The WD Power LSI
Systems Validation

group

implements a long term power
on/off stress test called the Torture Stand

(TS) for system validation. The
Torture Stand
implements large environmental chambers that test drives at
temperature and voltage corners over a duration of time
.


The Torture S
tand uses a specially designed PCBA called the Universal Test
Observation & Po
wer Interface Adapter (UTOPIA) board to control the power
supplied to the hard drive
.
The UTOPIA board has the feature to control the
power up/down voltage slew rate
.
UTOPIA 3.0 is the latest revision of the
UTOPIA family that also has the ability to
vary the supply voltage (
voltage
margining
) to the hard drive
.


In
the
Torture Stand, a small number of oscilloscopes are used to monitor hard
drives in order to capture failures. Ideally, each drive would be monitored by an
oscilloscope, but it is not rea
listic due to limited space and limited resources. The
Tektronix DPO7254 oscilloscope require
s

substantial lab space and cost
s

approximately $40,000 for one

unit. The Data Acquisition

(DAQ) Board

is meant
to

be a

replacement
for

an
oscilloscope
as applied
to

capturing failures in
the
Torture Stand. It
must

continuously record voltage and/or current measurements
in real time and have the ability to offload

data

to a PC for graphing. The DAQ is
required
to monitor any signal from a hard

drive’s test point reg
ardless of voltage
level or frequency.



2.

Pro
blem S
tatement

/
D
esign
R
equirement
s

a.

Data Acquisition Board
:

1.

Design a test board that reads the
input/
output voltages

and
current
s

from the
various test points

on a hard drive (e.g.
spindle motor, Voice Coil
Motor and 12V/5V current
)

and store
data onto board memory
.

a)

Interface with UTOPIA 3.0 power margining board as a
daughter board

b)

On
-
board wire fixtures (clamps/clips) for

wires on drive
test points

c)

Maximum board dimensions: 80mm x 80mm x 6mm

b.

Specifications:

1.

Minimum 4 channels to read voltage or current

a)

Voltage rating:

+/
-

20V

b)

Sampling rate: 10MS/s

2.

Dedicated onboard memory to store data

a)

Large “rolling” buffer (
Minimum
1.2 Gb Non
-
volatile
Memory
)

b)

Selectable
external toggle switch to
start/
stop
trigger

3.

Temperat
ure Rating:
-
10C to 70C

4.

Operates on 3.3V power supply

c.

Design

GUI or software to offload the data for processing on a PC

1.

Transfer
data from device memory

to PC

2.

Generate
g
raphs

as Matlab figures

3.

Scope /
P
roposed work & p
rocess

a.

Understand problem

1.

Learn basics

of analog to digital converters

2.

Introduction to
WD
P
ower

LSI devices

3.

Review existing
market

solutions

b.

Identify solution

(Document each step of process)

1.

Block diagram of

design

approach

a)

Hard
ware

solution

b)

Firmware solution

2.

Component selection

3.

Schematic
(E.g.

Express PCB)

4.

Layout
Printed Circuit Board (
PCB
)

5.

Assemble PCB

6.

Test PCB
A
/Firmware

7.

System
Test
with WD PCBA and
DAQ

PCBA

c.

Written report and working prototype

1.

Present
report to PLSI Systems Validation team

and demo
prototype

2.

Include correlation

r
esults
: Oscilloscope vs
DAQ

PCBA




4.

Expected deliverables:

a.

Weekly updates,

meeting
minutes and
action items

b.

Quarterly design reviews

c.

S
chematic and
layout

d.

Written report documenting all work through project

e.

Working prototype to test at Western Digital

f.

Bill of
materials (BOM)



5.

WD Provided

a.

Procure

and assemble

PCBA test
board

b.

Equipment
to complete project

1.

Tektronix DPO 7254

Oscilloscope

and voltage probes

(Already
provided)

2.

Three Channel Power Sup
pl
y

(Already provided)

3.

Programmable load

(Already provided)

4.

Function generator (
TBD
)

5.

Misc addition items will be provided if needed

c.

Matlab Student Version

(Already provided)



6.

R
equired hardware and software

a.

Development system

(A
lready provided)

b.

Express
PCB for

sc
hematic

and
layout

capture
(
free from ExpressPCB
)



7.

Schedule

/
Projected milestone completion dates:

This schedule is based on 2 students. All milestones are to be completed by end
of specified month

except where noted
:

a.

October

2013
: Project Kick
-
Off
.
Demonstration of existing WD
method
at Cal Poly

b.

January

2014
: Initial design r
eview including component selection and
interface

at WD Irvine

c.

February 2014
: Final design review
at Cal Poly


schematic
, GUI


d.

Early
March 2014
: Layout of Board, BOM

e.

March 2014
: PCB design and procurement/fabrication

f.

April 2014
:

PCBA testing with GUI

g.

May

20
1
4
:
Valid
ation testing

h.

June

2014
:
Final report

and Presentation at WD Irvine




8.

Block Diagram



System Block Diagram


DAQ
PCBA Block

Layout

text
MCU
CH
1
CH
2
CH
3
CH
4
RAM
U
3
.
0
Interface
FTDI UART
Converter


Note: U3.0 represents UTOPIA 3.0














This section
represents the DAQ
PCBA

Hard Drive


Test Point 1



Test
Point 2



Test Point 3



Test Point 4



9.

Student Criteria


Computer Engineer/
Firmware



Required Skills



Familiar

with GUI design

preferred

( example:
MATLAB
/Visual Basic/Visual
C++)



Experience

with embedded

system design (example: PIC/Atmel
)


Proposed Work



Design GUI to interface user with
the DAQ board



Hardware selection. Select
microcontroller

and ADC components



Interface
PC tes
t system to microcontroller
on DAQ

board



Test and validate system


Electrical Engineer/Hardware


Required Skills



Experience

with
analog circuit theory



Experience

with embedded system design
(example: PIC/Atmel
)


Proposed Work



Design circuit
that gathers and stores voltage and current

measurements

via
ADC



Hardware selection. Select
microcontroller and ADC components



Interface circuit to microcontroller



T
est and validate hardware