2

6308A–DRMSD–10-May-07

ATSAM2195

2.

Pin Description

2.1

Pins By Function – 44-lead QFN Package

Table 2-1.

Power Supply Group

Pin Name

Pin #

Type

Function

GND

20, 31, 33

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

21

PWR

I/O POWER SUPPLY

This pin should be connected to a nominal 3.3V power for 3.3V single supply

applications.

This pin should be connected to a nominal 1.8V power for 1.8V single supply

applications

VD18

19, 30

PWR

CORE POWER SUPPLY

These pins should be connected to nominal 1.8V.

3.3V single supply application: If the built-in regulator is used, then these pins

should be connected to the output of the regulator OUTVC18 (pin 35).

1.8V single supply application: If the built-in power switch is used for minimum

power down consumption, then all these pins should be connected to the output

of the power switch PWROUT (pin 39).

AGND

43, 44

PWR

ANALOG GROUND

These pins should be connected to an analog ground plane

VA33

4

PWR

DAC PERIPHERY ANALOG SUPPLY

3.3V single supply application: This pin should be connected to a nominal 3.3V

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

1.8V single supply application: This pin should be connected to a nominal 1.8V

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

VA18

2

PWR

DAC 1.8V ANALOG SUPPLY

This pin should be connected to a clean 1.8V.

3.3V single supply application: If the built-in regulator is used, then this pin should

be connected to the output of the regulator OUTVC18 (pin 35) through a serial

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

1.8V single supply application: If the built-in power switch is used, then this pin

should be connected to the output of the power switch PWROUT (pin 39) through

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

REGIN

34

PWR

Regulator input

This pin should be connected to a nominal 3.3V power for 3.3V single supply

applications.

This pin should be grounded for 1.8V single supply applications

PWRIN

38

PWR

Power switch input.

This pin should be left not connected for 3.3V single supply applications.

This pin should connected to a 1.8V nominal power for 1.8V single supply

applications