ATTINY11 查看數據表（PDF） - Unspecified

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ATTINY11

AVR Studio® Compatible

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Hardware Description

Figure 3-2. Implementation of LEDs and LED Headers

+5V

VTG

10K

LEDn

150R

12

LED0

LED1

LED2

LED3

LED4

LED5

LED6

LED7

GND

VTG

Note:

The AVR can source or sink enough current to drive a LED directly. In the

STK500 design, a transistor with two resistors is used to give the same amount

of light from the LED, whatever the target voltage (VTG) may be and to turn off

the LEDs when VTG is missing.

3.2

Description of

The switches connected to the debug headers are implemented as shown in Figure 3-3.

User Switches

Pushing a switch causes the corresponding SWx to be pulled low, while releasing it will

result in VTG on the appropriate switch header connector. Valid target voltage range is

1.8V < VTG < 6.0V.

Figure 3-3. Implementation of Switches and Switch Headers

VTG

SWn

150R

10K

SWn

12

SW0

SW2

SW4

SW6

GND

SW1

SW3

SW5

SW7

VTG

Note:

In the AVR, the user can enable internal pull-ups on the input pins, removing the

need for an external pull-up on the push-button. In the STK500 design, we have

added an external 10K pull-up to give all users a logical “1” on SWn when the

push-button is not pressed. The 150R resistor limits the current going into the

AVR.

3-2

1925C–AVR–3/03

AVR STK500 User Guide

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