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1389CS–CASIC–06-Nov-06

ATC18 Summary

4.

Basic Analog Cell Library, ANA18lib, ANA25lib, ANA33lib

The Atmel basic analog library makes the following parts available:

• Multiplexer modules

– Multiplexers to minimize cross-talk (for use with high-impedance nodes).

– Multiplexers to minimize ON resistance.

• Analog input and output cells

• Analog power and ground cells

A special set of basic analog I/O cells, ANA25lib (ANA33lib), is available for interfacing with

external 2.5V (3.3V) devices.

5.

General-purpose Analog Cell Library, GPlib

The General-purpose Analog Cell Library (GPlib) is composed of cells performing various ana-

log functions.

Currently available are:

• Regulators

• Power Management Cells

•Op Amps

•Comparators

•ADCs

•DACs

•PLLs

Additional high-performance, complex analog cells can be developed according to specific cus-

tomer requirements.

6.

Oscillator Cell Library, OSC18lib

The Atmel Oscillator Library provides stable clock sources. It comprises five standard oscillators.

The Atmel two-pad oscillators are designed with the Pierce three-point oscillator structure.

For the 32.768 kHz oscillator, the load capacitance must be between 6 pF and 12.5 pF. For

high-frequency oscillators, the load capacitance must be between 15 pF and 20 pF. External

capacitors must be added in order to obtain the correct load capacitance.

Clock output is high at off state (onosc = 0). The oscillators provide a bypass mode (onosc = 0),

clock = not (xin).

Table 6-1 gives the available OSC18lib cells and their major characteristics.

Table 6-1.

Oscillator Cells

Cell Name

Description

OSC18f33K

32.786 kHz crystal

OSC18f9M

9 MHz crystal oscillator

OSC18f16M

16 MHz crystal oscillator

OSC18f27M

27 MHz crystal oscillator