The Infrared Wireless Expert
ACT-IR8250P
Specification
12. Application Circuit
(Same as Circuit Schematic of IR8250PDB in Section 9)
1
2
3
4
5
6
A
B
C
D
6
5
4
3
2
1
D
C
B
A
Title
Number
Revision
Size
B
Date:
19-Dec-2003
Sheet of
File:
D:\data\IR8240-8250_EVA\IR8250_03\20031105_IR8250_(IR82x0PEK).ddb
Drawn By:
IR8250PDB Board
Yuwei
ACTISYS CORP.
CONFIDENTIAL
Copyright (C) 2003-2003 ACTiSYS Corp.
0.3
X1
7.3728MHz
C2
20pF
C1
20pF
C4
0.1uF
C3
0.1uF
R1 30k
R2
100k
IR_TX
IR_RX
/RST
D1
1N4148
IR_SD
NAME
I/O
DESCRIPTION
USAGE
TX
RX
STOP_RX
STOP_TX
Status
Enable
O
O
O
I
I
I
Serial data to host
Serial data from host
RX Flow-control to host
TX Flow-control from host
Status to host
Enable from host
High = idle / stop-bit / 1-bit
Low = start-bit / 0-bit
Low = start-bit / 0-bit
High = idle / stop-bit / 1-bit
High = IR8250P not ready to accept RX
Low = IR8250P ready to accept RX
High = Host not ready to accept TX
Low = Host ready to accept TX
High = no IrDA connection
Low = IrDA connection active
High = disallow IrDA connection
Low = allow IrDA connection
R5
30k
TEST
1
VCC
2
P2.1
9
P1.5
26
P2.5
3
VSS
4
XOUT
5
XIN
6
RST/NMI
7
P2.0
8
P2.2
10
P2.3
19
P2.4
20
P1.0
21
P1.1
22
P1.2
23
P1.3
24
P1.4
25
P1.6
27
P1.7
28
P3.0
11
P3.1
12
P3.2
13
P3.3
14
P3.4
15
P3.5
16
P3.6
17
P3.7
18
U1
IR8250P
Warning: very sensitive to EMI.
C5
0.1uF
R3
30k
C6
4.7uF/16V
for low power
IREDA
1
IREDC
2
TXD
3
RXD
4
SD
5
VCC
6
GND
8
Vlog
7
IR1
TFDU4300
R4 47R
IR_RX
IR_TX
IR_SD
Vcc
GND
1
2
3
4
5
6
7
8
9
10
J1
Link to IR82x0PEK board
TEST
/RST
R6
470R
LD1
LED
+3.3V
+3.3V
+3.3V
+3.3V
+
+3.3V
Status
Stop_Rx
Stop_Tx
Enable
Rx (from host Tx)
Tx (to host Rx)
Stop_Rx
Status
Stop_Tx
Enable
Rx (from host Tx)
Tx (to host Rx)
+3.3V
+3.3V
PCB footprint & dimensions, part number, supplier and pinout spec for the connector J1 on
IR8250x0PMB and IR8250PDB boards are as follows: Molex, part number SD-48148, you
can get dimensional information at:
. More details on page 17.
© Copyright 2003-2005 ACTiSYS Corp. Page 21 of 25
Jan 28, 2005
Rev. 0.44
