The Infrared Wireless Expert
ACT-IR8250P
Specification
2) ACT-IR8250PDB Daughter Board Circuit Schematic:
(Same as Application Reference Circuit in Section 11)
If your design uses daughter board configuration for convenient placement against front panel,
with cable connection to your system board, it is advisable for you to maintain the 10 pin connector as
in this ACT-IR8250PDB reference circuit here. This enables in-system IR8250P firmware
re-programming with new firmware if such need arises. This flexibility can extend your product
lifetime, improve compatibility with new IrDA devices, add or change IrDA functionality, indeed a
valuable and useful feature.
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 19 of 25
Jan 28, 2005
Rev. 0.44
