STK521 User Guide

2-4

8194B–AVR–01/12

2.1.1

Placing an Atmel AT90PWM81 on the Atmel STK521

The STK521 contains a ZIF socket for a SOIC20 package. Care should be taken so that the device is

mounted with the correct orientation. Figure 2-2 shows the location of pin1 for the ZIF socket.

Figure 2-2. Pin1 on ZIF Socket.

Caution: Do not mount an Atmel AT90PWM81 on the STK521 at the same time as an AVR is mounted

on the STK500 board. None of the devices might work as intended.

2.2

Powering the STK521

The STK521 can be powered as follows :

1.

Through the STK500 by selecting POWER switch to VTG.

2.

Through an external power supply using the jack connector and selecting POWER switch to

VEXT.

In this latter case, power supply must be 10V DC for a 5V device power supply.

PIN1