connected mode with the same COM port settings. See Figure 3.9.
Each MCP2120 Developer鈥檚 Board should be powered. Use the pair of 18鈥?/div>
(45 cm) power jumper cables to power MCP2120 Developer鈥檚 Board #2 from
MCP2120 Developer鈥檚 Board #1. Optionally, MCP2120 Developer鈥檚 Board #2
could be powered from a 9V battery. When the MCP2120 Developer鈥檚 Board
is powered, the green LED (labeled D3) will be on.
Each MCP2120 Developer鈥檚 Board should be connected to their respective
PC serial port, so that Hyperterminal can communicate to the board.
The MCP2120 Developer鈥檚 Board should be oriented so that the integrated
optical transceivers are aligned with each other (as shown in Figure 3.18). For
the initial communication between the two boards, the MCP2120 Developer鈥檚
Boards should be approximately 6鈥?(15 cm) apart.
Type a string of characters in the Hyperterminal window on PC #1. This same
character sting should appear in the Hyperterminal window of PC #2. Typing a
string of characters in the Hyperterminal window on PC #2 should have the
same character string appear in the Hyperterminal window of PC #1.
Congratulations! You may now start modifying the system to evaluate/test the
operation of the MCP2120 and MCP2120 Developer鈥檚 Board.
Figure 3.18: MCP2120 Tutorial System
To IrDA Developer鈥檚 Kit Power Supply (9V)
MCP2120 Developer鈥檚 Board #1
R9
D3
D6 D2
C17
C11
U2
C18
C6
R3
Y1
J5
CR1
D4
C15
C4
C7
C12
C13
C14
JP5 R1
Q1
U3
C9
C5
C1
R14
R2
C2
JP3:JP1
000=Fosc/768
001=Fosc/384
010=Fosc/192
011=Fosc/128
100=Fosc/64
111=S/W Baud
Open=0
MODE
RTS
Integrated
Transceiver
R13
C16
D1
D5
U6
C8
C10
R4
JP4
+5V
GND
R15
U4
R5
R11
D1
D5
C16
R12
MCP2120 Developer鈥檚
Board #2
J2
U5
To PC #2
Component
Transceiver
J7
J6
DB9
TX
錚?/div>
2001 Microchip Technology Inc.
C11
R15
Pair of 18鈥?Power Jumper Cables
DS51246A-page 35
J5
R9
D3
D6 D2
C10
U2
R3
C6
U4
To PC #1
C18
CR1
C4
R4
J1
D4
C15
+5V
GND
JP4
R10
R5
R11
MCP2120 Developer鈥檚 Board
02-01608 Rev. 1
J3
C7
(MCP2120)
Open=Enabled
J4
RX
Component
J2
Header
U1
C13
C12
C14
JP5 R1
C3
C8
Q1
U3
R8
R7
R6
Transceiver
J6
J7
R12
U6
IR
C1
C5
C9
R14
R2
C3
C2
JP3:JP1
000=Fosc/768
001=Fosc/384
010=Fosc/192
011=Fosc/128
100=Fosc/64
111=S/W Baud
Open=0
R8
R7
R6
U1
J4
(MCP2120)
Open=Enabled
J3
RTS
MODE
TX
RX
C17
R10
MCP2120 Developer鈥檚 Board
02-01608 Rev. 1
U5
J1
Header
DB9
Integrated
Transceiver
R13
Y1
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