Rainbow Electronics AT83C24NDS - Manual (Page 36)

36
4234F–SCR–10/05
AT83C24
Typical NDS
Application
Figure 2. Typical NDS Standard Mode Application Diagram for 1 AT83C24NDS.
Note: 1. The external resistor on I/O can be removed if the host pin has an internal resistor.
2. The internal pull up on PRES/INT is disabled during reset (recommended external 20kOhms
pull up).
3. Refer to application note for AT83C24NDS software configuration.
100nF
XTAL1 XTAL2
1uF
Host
CVSS CVSS
2.2µF
C1
C2 C10
4.7µH
VSS
VSS
PRES/INT
CLK
VSS V
CC
CVCC
LI
CVSS
SCL
SDA
I/O, C4, C8
V
CC
MICROCONTROLLER
TWI
INT0
Px.y
L1
RESET RST
V
CC
18.432 or 27MHz
A2/CLK
A1/RST
A0/3V
EVCC
EV
C
C
VSS
DVCC
100nF
VCC
2.2uF
CVSS
C3
VSS
Reset
pullup
SDA,
SCL
pullups
See note1
for I/O pull up
CRST
CPRES
CIO, CC4, CC8
CCLK
AT83C24NDS
100nF
C13
VSS
Px.y
Px.y
Px.y
VSS
card
Smart
Card 1
CVCCin
present
See note 2