SAM2695 datasheet(2/44 Pages) ETC1

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SAM2695

1- PIN DESCRIPTION

1-1- PINS BY FUNCTION – 48-lead QFN Package

5VT

indicates a 5 volt tolerant Input or I/O pin.

DR4, DR8

indicates driving capability at VOL, VOH (see § 4- D.C. CHARACTERISTICS)

Power supply group

Pin name

Pin #

Type

Description

GND

9, 13, 18, 25,

36, 45, 48

PWR

DIGITAL GROUND

All pins should be connected to a ground plane

GND

exposed die

pad

PWR

DIGITAL GROUND

Ground supply; down bonded to the exposed die pad (heatsink).

It is recommended, but not obligatory, to connect this pad to a

ground plane during PCB layout

VD33

8, 11, 20, 31,

35, 41, 46

PWR

PERIPHERY POWER SUPPLY (+2.7V to 3.6V)

All VD33 pins should be returned to nominal +3.3V.

AGND

PWR

ANALOG GROUND

This pin should be connected to an analog ground plane

VA33

PWR

CODEC PERIPHERY ANALOG SUPPLY

This pin should be connected to a nominal 3.3V power through a

serial inductor filter (better result) or a 10 ohm resistor.

Serial MIDI, parallel MIDI

Pin name

Pin #

Type

Description

MIDI_IN

IN-5VT

Serial TTL MIDI IN. Connected to the built-in synthesizer at

power-up. This pin has a built-in pull up. It should be left open or

tied HIGH if not used.

D0-D7

24, 26-30,

32, 33

I/O

-5VT-DR8

8-bit data bus to host processor.

Information on these pins is parallel MIDI

IN-5VT

Select data(0) or control(1) for write, data(0) or status(1) for

read.

CS/

IN-5VT

Chip select, active low. This pin has a built-in pull up. It should

be left unconnected if not used.

RD/

IN-5VT

Read, active low. When CS/ and RD/ are low, data (A0=0) or

status (A0=1) is read on D0-D7. Read data is acknowledged on

the rising edge of RD/.

WR/

IN-5VT

Write, active low. When CS/ and WR/ are low, data (A0=0) or

control (A0=1) is written from the D0-D7 bus to the SAM2695 on

the rising edge of WR/.

IRQ

OUT-DR4 A rising edge indicates that a MIDI byte is available for read on

D0-D7. Acknowledged by reading the byte.

Analog audio group

Pin name

Pin #

Type

Description

MICIN

Analog microphone input.

AOUTL

OUT

Left channel audio line or headphones output

AOUTR

OUT

Right channel audio line or headphones output

VCM

OUT

Analog common-mode voltage. Should be stabilized by external

capacitors 10µF // 100nF to AGND.

VCMHPOUT

OUT

Analog headphones common-mode voltage buffer output.

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