AT89STK03 Atmel, AT89STK03 Datasheet - Page 9

• Manufacturer Part Number: AT89STK03
• Manufacturer: Atmel

Specifications of AT89STK03

• Lead Free Status / RoHS Status: Supplier Unconfirmed

7609B–SCR–11/06
Hardware Description
2.2
2-6
Power Supply
The on-board power supply electronics enable various power supply configurations.
The power source can be:
The power source selection is done by means of a jumper. The jumper must be set
accordingly with the selected power source. The input of laboratory power supply is not
controlled by the jumper. This source is directly applied to the input of the low drop
regulator.
Any power supply (including the Laboratory Power Supply) can be turned on/off by
using the red switch (POWER). Once the power is established, the power LED (PWR)
becomes red. A low drop regulator is used to deliver a 3.6V or a 5V voltage.
The low drop regulator can be bypassed by means of “REG. BYPASS” jumper. In this
case the power source is directly applied on the MCU. Extreme care must be taken in
using this feature and it is recommended to use it only with a Laboratory Power Supply
perfectly stable and controlled.
The demonstration board is protected by a fuse soldered on board. In case the fuse
blows, it is possible to bypass it by adding a solder gout on the solder pad next to the
fuse on the component side of the board until its replacement. Once the fuse is
replaced, the solder gout must be removed from the bypass pad.
Table 2-1. Power supply specifications and configurations
Jumper
Position
USB
USB_LMT
DC_IN
BATT
–
–
–
–
VBus from USB interface (USB connector)
An external power converter (9V DC connector)
9V Battery (9V BATT connector)
Laboratory Power Supply (LAB PWR connector)
Power Supply
USB interface
USB interface
External
power supply
Battery
Min
4.3
7.0
6.5
Max
5.5
9.0
9.0
Unit
V
V
V
Comments
- Default configuration
- Applicable when CPU demonstration
board is used alone
- Applicable when CPU demonstration
board is plugged in the C51 generic
board
- This configuration prevents the
electronics of CPU and C51 generic
board from drawing inrush currents from
USB interface
Applicable when the board is fed by an
external power converter
Applicable when the board is fed by an
external battery
AT89STK-03 Hardware User Guide