ATTINY28 データシートの表示（PDF） - Unspecified

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ATTINY28

AVR Studio® Compatible

Unspecified 

Hardware Description

3.8.1

Target VCC Settings,

VTARGET

VTARGET controls the supply voltage to the target AVR microcontroller sockets. It can

either be controlled from AVR Studio or supplied from an external source. If the VTAR-

GET jumper is mounted, the on-board supply voltage is connected. The on-board

supply voltage can be adjusted to 0 - 6V from AVR Studio. Always verify the respective

datasheet for the AVR device operating voltage before adjusting VTARGET voltage.

Using the on-board supply voltage, approximately 0.5A can be delivered to the target

section. See “Appendix A” in Section 10.

If the VTARGET jumper is disconnected, target VCC must be supplied from an external

source at one of the VTG pins on the PORT headers. Figure 3-21 explains VTARGET

jumper options.

When using an external source for VTARGET, the user must control that VTARGET is

at a higher voltage level than AREF (analog reference voltage). Always connect com-

mon ground (GND) when using an external VTARGET voltage.

Figure 3-21. VTARGET Jumper Options

Jumper Mounted

VTARGET

AREF

On-board VTARGET supply connected (default)

Jumper not Mounted

VTARGET

AREF

On-board VTARGET supply disconnected

The STK500 master microcontroller controls the target voltage using the internal PWM.

Figure 3-22 shows the internal connection of the VTARGET signal.

Figure 3-22. VTARGET Connection

Master Wr PWM

MCU

Rd

ADC

10 - 15V

VIN

Voltage

Regulator

VTARGET

0 - 6V

Jumper

VTG NET

Green LED

3-16

1925C–AVR–3/03

Note: The green LED will light when there is a voltage available on the VTG NET. It’s

impossible to use the debug or programming area of STK500 without VTG.

AVR STK500 User Guide

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