Washing Machine SolutionsAffordable Intelligent Motion

SenseTile Hardware Design Review 1

CASL, UCD, 12 December 2008

1Confidential mSemicon & UCD19/04/23

Agenda

Current status of design work Description of design Extra features Dimensions Schedule

2Confidential mSemicon & UCD19/04/23

Current Status of Design Work

Schematic has been completed about 99% All on-board electronic components selected

Only issue remaining relates to selection of connectors Some other minor issues Some feedback required on mechanical issues

Following today’s review, layout is expected to begin immediately

3Confidential mSemicon & UCD19/04/23

General Description of Design

The schematic is divided into eight separate sheets describing: CODEC / ADC circuit FPGA circuit Audio and ultrasonic inputs Audio input circuitry (Input 1) General input circuitry (Input 2) Microcontroller circuitry Output circuitry Power supply circuitry (Prior USB circuitry, to be removed) New USB circuitry

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CODEC / ADC

Design based on two devices:

ADC for simultaneous sampling (for non-audio applications) ADS1174/8 For slowly changing signals: DC to 4kHz sampling Four channel

CODEC AD1937 Very high performance: high speed Built-in audio filters Extremely low noise

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FPGA

Design based on Xilinx XC3S250 (Spartan)

General purpose FPGA Configuration by:

JTAG (during development) SPI (direct, during test and development); SPI can be directly updated by USB (i.e. not through the microcontroller)

on deployment

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Audio Input Circuitry – Input 1

Catering for audio range (2) and ultrasonic range (2)

Number of total usable inputs depends on sample rate Extremely low noise amplifiers

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General Input Circuitry - Input 2

Catering for general inputs from sensors and switches

Four analogue inputs

Eight digital I/O User configurable via microcontroller

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Microcontroller Circuit

Based on STM32F103V9 Cortex device from ST

Latest generation Cortex ARM processor Built in RAM/Flash Multifunction I/O JTAG programmable in-circuit debugger

RS 232 debug port, allowing external programming of micro flash GSM port

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Output Circuitry

Drivers for speakers Audio Ultrasonic

On board relays (2) IR LED drivers (shown on FPGA sheet) IR detection to be added

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Power Supply

Works on 12-30Vdc in Generated on board: 1.2V, 2.5V (linear), 3.3V x 2, 5V, -11V, +11V Point of load power supply design

FPGA powered separately Analogue circuitry powered separately Microcontroller can operate on its own

Current sensor on board, monitoring total current consumption Information processed by microcontroller

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(Prior USB Design)

Until last few weeks, USB was run on a MCS7840 Four channel UART to USB device Satisfied requirements, but

Heavy load on FPGA Mandated FPGA programming indirectly

A new device is becoming available now, and will be used instead

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New USB Ciruitry

FTDI USB-high speed data port A new electronic device is being sampled at the moment, and will

enter production “in March 2009” which, on board, would allow: Direct programming of the SPI Direct access to generalised I/O CPU high-speed parallel bus interface (asynchronous) Four fold (+) increase in performance

Host can talk directly to the FPGA via file transfer

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Extra Features

Adding a port for a display: Considering making provision for LCD display This enables easier autonomous use of device Display itself not installed on boards

Other features being considered and, if possible, included

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Current Draft Connector Requirements

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Connector Type of Socket

Power StandardUSB (1) USB-B Acoustic microphone (4) [high perf.]

3.5mm jack

Acoustic speaker (1) 3.5mm jack

Ultrasonic speaker (1) 3.5mm jack

Ultrasonic microphones (4) 3.5mm jack

Digital I/O IDC 0.1”Relay contacts IDC 0.1”Analog expansion slot IDC 0.1”

External DC power supply 3.1mm power

Connectors – Sensor Inputs The selection of connectors influences overall board size

Try to be as compact as possible Another requirement is that special mating connectors should not be

necessary – for R&D work A suitable connector style is the DIN 45326

Can take up to 8 wires in one unit Suitable for sensor inputs Rotates and locks into position Wires can be soldered onto mating part

This type proposed for simultaneous inputs

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Connectors – Power Board uses 12Vin, but also supplies 12Vout to feed Processor Unit

Requires compact multi-pole solution Needs to be robust, and not subject to loosening due to vibration

Needs to snap into position Propose Mini-Fit Jr™ 5569 from Molex

Or equivalent from Würth

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Audio I/O – Audible and Ultrasonic

Both pairs of microphones will be installed on daughterboard(s) “Both” meaning audible and ultrasonic

Main board will be upside-down Daughterboard will be suspended underneath

The relative orientation of daughter-boards, if two, has to be decided

Alternative could be a small single board with four microphones, pairs mounted at extremities

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Dimensions

Circuit board layout not started yet Connectors have a very important bearing on overall size

Issue to be settled Orientation of PIR sensor and microphone daughterboard important

Propose DIN style for general inputs Can accommodate 4 pairs each

Dimensions are expect to be in the range of 120mm x 170mm

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Near-term Schedule

Layout to begin 15/12/08 Scheduled to finish late January Bare boards available first week of February Will be built up and debugged gradually

HW: PS, processor, ... SW: Linux USB driver (SPI & CPU bus), FPGA VHDL (in progress), Micro

board support Best case scenario is 6 weeks after board arrives for first sample

With partial driver and board support package functionality Likely scenario is 9 weeks after board arrives for first sample

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