Arcam RDAC - Service Manual - Page 3

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Main micro

circuit page 2

The main micro at location IC107 (on the diagram this is split into two area these are micro

power and config + Micro I/O) we will deal with Micro power and config 1

Micro power and config

Two separate power supplies are required by the AT91SAM these are taken from 3V3 and 1V8

for the processor core – the micro is programmed with bespoke Arcam code the oscillator for

the micro is at X101 and runs at 4MHz the TDI TDO TCK TMS ERASE NRST pins are for

development Debug use and the connecter at location CON103 is not fitted to production items

Micro I/O

Pin descriptions

Pin name

SPDIF INT

Source

Mute RLY

DAC MUTE

ENABLE KLEER

ENABLE SPDIF

SERIAL UC to KLEER Serial control to KLEER wireless option

SERIAL KLEER to UC Serial data from KLEER to UC

SCL

SDA

Enable LEDS

LED 0

LED 1

LED 3

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Description

Interrupt flag from the SPDIF receiver

To source select TACT switch

Control of mute relay via TR100

DAC MUTE signal to Pin 25 of Wolfson DAC at location IC301

To MUX at location IC205A

To MUX at location IC202A

To EEprom at location IC108 / DAC at location IC301 / USB receiver at

IC103

To EEprom at location IC108 / DAC at location IC301 / USB receiver at

IC103

LEDs on control

Binary select for LED control via 3 – 8 line decoder at location IC102