Datasheet

18
7764A–8051–11/07
DTR Rx_PC CTS DSR
Tx_MCU Rx_MCU
Tx_PC RTS
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc Vcc
Vcc
Vcc
/PSEN
P3_0/RxD
P3_1/TxD
RST
AUTO ISP FEATURE RS232 INTERFACE
C25 100n C25 100n
C17 100n C17 100n C22 100n C22 100n
C26 100n C26 100n
SW1 RESET SW1 RESET
2 3
14
1
7
U9A 74HC125/SO_5 U9A 74HC125/SO_5
CD2 100n CD2 100n
D12 Green Led Tx LED D12 Green Led Tx LED
5 6
14
4
7
U10B 74HC125/SO_5 U10B 74HC125/SO_5
C18 100n C18 100n
D11 Green Led Rx LED D11 Green Led Rx LED
C19 100n C19 100n
1 2
J11
RTS
J11
RTS
C23 100n C23 100n
R6 10K R6 10K
1 2
J13J13
C21 100n C21 100n
5 9 4 8 3 7 2 6 1
P1 SUB-D9 FEMALE RS232 P1 SUB-D9 FEMALE RS232
R23 1K R23 1K
R24 1K R24 1K
SW8 ISP SW8 ISP
C1+
1
C1-
3
C2+
4
C2-
5
VCC
16
GND
15
V+
2
V-
6
R1OUT
12
R2OUT
9
T1IN
11
T2IN
10
R1IN
13
R2IN
8
T1OUT
14
T2OUT
7
U7 SIPEX-SP3232ECA U7 SIPEX-SP3232ECA
R22 1K R22 1K
C20 100n C20 100n
C16 100n C16 100n
C1+
1
C1-
3
C2+
4
C2-
5
VCC
16
GND
15
V+
2
V-
6
R1OUT
12
R2OUT
9
T1IN
11
T2IN
10
R1IN
13
R2IN
8
T1OUT
14
T2OUT
7
U8 SIPEX-SP3232ECA U8 SIPEX-SP3232ECA
C24 100n C24 100n
1 2
J12
DTR
J12
DTR