ATSTK500 Atmel, ATSTK500 Datasheet - Page 26

• Manufacturer Part Number: ATSTK500
• Description: PROGRAMMER AVR STARTER KIT
• Manufacturer: Atmel
• Series: AVR®r
• Type: MCUr

Specifications of ATSTK500

• Contents: Board, Cable, CD and Documentation
• Data Bus Width: 8 bit
• Interface Type: RS-232
• For Use With/related Products: Atmel AVR Devices
• For Use With: ATADAPCAN01 - EXTENSION CAN ADD-ON TO STK500/1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1925C–AVR–3/03
Hardware Description
3.8.1
3-16
Target V
VTARGET
CC
Settings,
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 V
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
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
Note:
On-board VTARGET supply disconnected
On-board VTARGET supply connected (default)
Jumper not Mounted
Jumper Mounted
Master
MCU
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.
Rd
ADC
Wr
VTARGET
VTARGET
AREF
AREF
PWM
10 - 15V
VIN
Voltage
Regulator
0 - 6V
CC
must be supplied from an external
VTARGET
Jumper
AVR STK500 User Guide
Green LED
VTG NET