The document provides a schematic diagram and details for an AVR development board, including connections for power supply, serial communication, and JTAG. It outlines usage of matrix keyboards and the configuration needed for I2C, ensuring compatibility with various AVR controllers. Additional notes on fuse settings, external pull-ups, and voltage support (5V and 3.3V) are also included.

1. 1 2
3 4
5 6
7 8
9 10
1
2
I2C
1
2
3
4
5
6
7
8
9
DB9
Gnd
OutIn
U2
7805
C1
0.33uf
C2
0.1uf
D1
1N4007
D2
1N4007
D3
1N4007
voltage select
POWER SUPPY
R20UT
9
T2IN
10 T1IN
11
R1OUT
12
R2IN
13
T1OUT
14
GND
15
C1+
1
max232
V+
2
C1-
3
C2+
4
C2-
5 V-
6
T2OUT
7
R2IN
8
VCC
16
U3
MAX232
C31
1uf
1uf
C35
1uf vcc
Gnd
C34
1uf
C33
1uf
Gnd
Gnd
D1
LED
Gnd
SERIAL COMMUNICATION
470
12
34
56
78
910
ISP
Gnd
VCC
MOSI
MISO
SCK
Rst
PB0(T0)
1
PB1(T1)
2
PB2(INT2/AIN0)
3
PB3(0C0/AIN1)
4
PB4(/SS)
5
PB5(MOSI)
6
PB6(MISO)
7
PB7(SCK)
8
/RST
9
Vcc
10
Gnd
11
XTAL2
12
XTAL1
13
PD0(RXD)
14
PD1(TXD)
15
PD2(INT0)
16
PD3(INT1)
17
PD4(OC1B)
18
PD5(OC1A)
19
PD6(ICP1)
20
PD7(OC2)
21
PC0(SCL)
22
PC1(SDA)
23
PC2(TCK)
24
PC3(TMS)
25
PC4(TD0)
26
PC5(TDI)
27
PC6(TOSC1)
28
PC7(TOSC2)
29
AVcc
30Gnd
31
ARef
32
PA0(ADC0)
40
PA1(ADC1)
39
PA2(ADC2)
38
PA3(ADC3)
37
PA4(ADC4)
36
PA5(ADC5)
35
PA6(ADC6)
34
PA7(ADC7)
33
AVR
ATmega32
ATmege 32
Gnd Gnd
VCC
VCC
470
470
470
470
VCC
VCC
Gnd
PORTA
HEADER
1 2
3 4
5 6
7 8
9 10
PORTC
HEADER
1
10K
VCC
Gnd
1
2
3
4
5
6
7
8
9
10
VCC
Gnd
1
10K
SS
MOSI
MISO
SCK
SPI
HEADER
VCC
ISP CONNECTIONS
1 2
3 4
5 6
7 8
9 10
JTAG
SCL
SDA
TCK
TMS
TDO
TDI
47k
VCC
Gnd
Rst
RXD
TXD
TXD
JTAG CONNECTIONS
RXD
CONTROLLER CONNECTIONS
S4 S6
S2
S5
S3S1
TCK
TDO
TMS
TDI
Rst
Gnd
Gnd
VCC
HEADER HEADER
SCL
SDA
I2C CONNECTIONS
MATRIX KEYBOARD
COL1
COL2
COL3
ROW1
ROW2
COL1
COL2
COL3
ROW1
ROW2
5v
3.3v
VCC
3.3V
GndVcc
U?
DC PIN
7V( MIN)
THE MATRIX KEYBOARD IS LIKE ANY
SUCH CONVENTIONAL KEYBOARDS
USE ROW OR COLUMN KEY SCANNING
FOR DETAILS REFER THE SITE
http://www.dribin.org/dave/keyboard/html/
NOTE :-EXTERNAL PULLUPS PROVIDED
ALMOST ALL AVR CONTROLLER(DIP-40) HAS THE
SAME PINOUTS HENCE CAN BE USED AS GENERAL
DEVELOPMENT BOARD.
FOR JTAG MAKE SURE THE
THE CONTROLLER SUPPORTS IT
JTAG FUSE BIT ARE SET
FOR ISP DETAILS VISIT
FOR I2C AND KEYBOARD
FOR SERAIL COMMUNICATION IT IS ADVICED
TO USE MAX3232A
PROBLEM IN SERIAL COMMUNICATION CHECK
XTAL FUSE BIT SETTINGS OF CONTROLLER
THE CABLE AND IC BY ECHOING DATA
XTAL FREQUENCY DECLARED IN SOFTWARE
VOLTAGE 5V AND 3.3V SUPPORTED
decoupling
0.1uf
Gnd
http://www.vignesh.byethost4.com/isp.html
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Title
Author
File
Revision
Document
Date Sheets
AVR DEV board
Pradheep
TCE(SMART HOME)
E:SmartHomeschematicavrdevboard1.0.dsn
1.0
1
18/12/07 1 of 1