AT83C24B datasheet(4/42 Pages) ATMEL

4 / 42 page

4234F–SCR–10/05

AT83C24

SDA

VCC

3 kV

I/O

open-

drain

Microcontroller Interface Function

TWI serial data

SCL

VCC

3 kV

I/O

open-

drain

Microcontroller Interface Function

TWI serial clock

I/O

EVCC

3 kV

I/O

Microcontroller Interface Function

Copy of CIO pin and high level reference for EVCC.

An external pull up to EVCC is needed on IO pin.

I/O is the reference level for EVCC if EVCC is connected to a capacitor.

This feature is unused if EVCC is connected to VCC.

EVCC

3 kV

I/O

(pull-up)

Microcontroller Interface Function

Copy of Card CC4.

EVCC

3 kV

I/O

(pull-up)

Microcontroller Interface Function

Copy of Card CC8.

CLK

EVCC

3 kV

Microcontroller Interface Function

Master Clock

CIO

CVCC

8 kV+

I/O

(pull-up)

Smart card interface function

Card I/O

CC4

CVCC

8 kV+

I/O

(pull-up)

Smart card interface function

Card C4

CC8

CVCC

8 kV+

I/O

(pull-up)

Smart card interface function

Card C8

CPRES

VCC

8 kV+

(pull-up)

Smart card interface function

Card presence

An internal Pull-up to VCC can be activated in the pad if necessary using PULLUP bit

(CONFIG1 register).

CCLK

CVCC

8 kV+

Smart card interface function

Card clock

CRST

CVCC

8 kV+

Smart card interface function

Card reset

CMDVCC

EVCC

3 kV+

(pull-up)

Microcontroller Interface Function:

Activation/Shutdown of the smart card Interface.

VCC

3 kV+

PWR

Supply Voltage

CC is used to power the internal voltage regulators and I/O buffers.

3 kV+

PWR

DC/DC Input

LI must be tied to VCC pin through an external coil (typically 4.7

μH) and provides the

current for the charge pump of the DC/DC converter.

It may be directly connected to VCC if the step-up converter is not used (see STEPREG

bit in CONFIG4 register and see minimum VCC values in Table 20 (class A) and

Table 21 (class B)).

Table 1. Ports Description (Continued)

Pad Name

Pad Internal

Power Supply

ESD

Limits

Pad

Type

Description

AT83C24B Datasheet(PDF) 4 Page - ATMEL Corporation

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