AT89C5122D-RDRUM datasheet(14/208 Pages) ATMEL

14 / 208 page

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

PSEN

VCC

Program Strobe Enable:

The read strobe to external program

memory. When executing code from the external program memory,

PSEN is activated twice each machine cycle, except that two PSEN

activations are skipped during each access to external data memory.

PSEN is not activated during fetches from internal program memory.

PLLF

AVCC

PLL Low Pass Filter input

Receives the RC network of the PLL low pass filter.

AVCC

PWR

Analog Supply Voltage

AVCC is used to supply the internal 3.3V analog regulator which

supplies the internal USB driver

VCC

2012

PWR

Supply Voltage

VCC is used to supply the internal 3.3V digital regulator which

supplies the PLL, CPU core and internal I/O’s

PWR

DC/DC Input

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

- LI tied directly to VCC : the DC/DC converter must be configured in

regulator mode.

- LI tied to VCC through an external 10μH coil : the DC/DC converter

can be configured either in regulator or in pump mode.

CVCC

PWR

Card Supply Voltage

CVCC is the ouput of internal DC/DC converter which supplies the

Smart Card Interface. It must be connected to an external decoupling

capacitor of 10 μF with the lowest ESR as this parameter influences

on the CVCC noise

DVCC

PWR

Digital Supply Voltage

DVCC is the output of the internal analog 3.3V regulator which

supplies the USB driver. This pin must be connected to an external

680nF decoupling capacitor if the USB interface is used.

This output can be used by the application with a maximum of 10 mA.

CVSS

GND

DC/DC Ground

CVSS is used to sink high shunt currents from the external coil

VSS

GND

Digital Ground

VSS is used to supply the PLL, buffer ring and the digital core

AVSS

GND

Analog Ground

AVSS is used to supply the USB driver.

Table 2.

Pin Description (Continued)

Port

Internal

Power

Supply

ESD

I/O

Reset

Level

Alt

Reset

Config

Conf 1

Conf 2

Conf 3

Led

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