Appendix
4-12
AT89C5131A Starter Kit Hardware User Guide
4245A–USB–11/04
4.1
Electrical Schematics
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
D+
D-
VREF
Vb
us
USB_CON_D-
USB_CON
_D+
PLLF
AV
DD
_SS
M
ISO
SCK
M
OSI
V-
V+
GND
Tx
_PC
Gen
eric_SCL
SDA
S
CL
TxD_
µC
R
xD_µC
Ge
neric_SDA
Vcc
TWI_CO
N_SDA
TWI_CON
_SCL
USB_CON
_D+
USB_CON_D-
AVSS
Vss
GND
R
xD_µC
TxD_
µC
TWI_CO
N_SDA
Vcc
Vss
XT
AL1
Vss
_RST
T
est0
Vss
T
est1
Vss
TWI_CON
_SCL
GND
GND
R
x_PC
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
VREF
D+
D-
Vbus
PLLF
AVDD
AVSS
P1_1
P1_5
P1_6
P1_7
P3_0
Vcc
P3_1
P4_1
P4_0
Gen
eric_SDA
Gen
eric_SCL
XT
AL1
_RST
P3_2
P3_4
T
itle
S
ize
Do
cument Number
Rev
Date:
S
heet
of
1
1
.0.2
AT89C5131 Evab_1.0
.2 - Bus
A
1
4
Frida
y, October 25, 2002
Vpp
R3
100
R8
4
.7 K
U1
MAX202ECSE
C1+
1
C1-
3
C2+
4
C2-
5
VCC
16
GN
D
15
V+
2
V-
6
R1OUT
12
R2OUT
9
T1IN
11
T2IN
10
R1IN
13
R2IN
8
T1OUT
14
T2OUT
7
D2
L
ED GREEN
Tx LED
CT6
CONTA
CT
1
2
R5
27
P1
RS232 Fe
male
5
9
4
8
3
7
2
6
1
C4
0.
1 µF
R1
1 K
J4
CO
NNECTOR SIP4 RA
TWI Ma
le
1
2
3
4
CT5
CONTACT
1
2
J1
USB B
1
2
3
4
CT2
CONTACT
1
2
C3
0.
1 µF
C1
10
nF
CT4
CONTA
CT
1
2
CT1
CONTACT
1
2
CT3
CONTACT
1
2
C6
0.
1 µF
R2
1
.5 K
D1
LED
RED
Rx
LED
C2
2.2
nF
C7
0.
1 µF
R6
1
K
R7
4
.7 K
TP2
D
- TP
1
SW1
USB Un
load
T
P1
D+
TP
1
J2
CO
NNECTOR SIP6 RA
SP
I Male
1
2
3
4
5
6
J3
LPC
Test Mode Male
1
2
3
4
5
6
7
8
9
10
C5
0.1
µF
R4
27
Electrical Schematics
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
D+
D-
VREF
Vb
u
s
USB_CON_D-
USB_CON
_
D
+
PLLF
AV
D
D
_SS
M
ISO
SCK
M
OSI
V-
V+
GND
Tx
_PC
G
e
n
eric_SCL
SDA
SC
L
TxD_
µC
R
xD_µC
G
e
neric_SDA
Vcc
TWI_CO
N_SDA
TWI_CON
_SCL
USB_CON
_
D
+
USB_CON_D-
AVSS
Vss
GND
R
xD_µC
TxD_
µC
TWI_CO
N_SDA
Vcc
Vss
X
T
AL1
Vss
_RST
T
est0
Vss
T
est1
Vss
TWI_CON
_SCL
GND
GND
R
x_PC
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
VREF
D+
D-
Vbus
PLLF
AVDD
AVSS
P1_1
P1_5
P1_6
P1_7
P3_0
Vcc
P3_1
P4_1
P4_0
G
e
n
eric_SDA
G
e
n
eric_SCL
X
T
AL1
_RST
P3_2
P3_4
T
itle
S
iz
e
D
o
cument Number
R
e
v
Date:
S
heet
of
1
1
.0.2
AT89C5131
Evab_1.0.
2
-
B
u
s
A
14
Frida
y
,
October 25, 2002
Vpp
R3
100
R8
4
.7 K
U1
MAX202ECSE
C1+
1
C1-
3
C2+
4
C2-
5
VCC
16
GN
D
15
V+
2
V-
6
R1OUT
12
R2OUT
9
T1IN
11
T2IN
10
R1IN
13
R2IN
8
T1OUT
14
T2OUT
7
D2
L
ED GREEN
Tx LED
C
T
6
CONTAC
T
1
2
R5
2
7
P1
RS232 Fe
male
5
9
4
8
3
7
2
6
1
C
4
0.
1 µF
R1
1 K
J4
C
O
NNECTOR SIP4 RA
TWI Mal
e
1
2
3
4
C
T
5
CONTACT
1
2
J1
USB B
1
2
3
4
C
T
2
CONTACT
1
2
C
3
0.
1 µF
C1
1
0
nF
C
T
4
CONTAC
T
1
2
C
T
1
CONTACT
1
2
C
T
3
CONTACT
1
2
C
6
0.
1 µF
R2
1
.5 K
D1
LED R
E
D
R
x
LED
C2
2.2 n
F
C
7
0.
1 µF
R6
1 K
R7
4
.7 K
TP2
D
- TP
1
SW1
USB Un
load
TP
1
D+ T
P
1
J2
C
O
NNECTOR SIP6 RA
S
P
I Male
1
2
3
4
5
6
J3
LPC
Test Mode Male
1
2
3
4
5
6
7
8
9
10
C5
0.1
µ
F
R4
2
7