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MCP2120 Datasheet

  • MCP2120

  • Infrared Encoder/Decoder

  • 36頁

  • Microchip   Microchip

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MCP2120/MCP2150 USER鈥橲 GUIDE
3.4 Hardware Setup
3.4.1.
Oscillator
The crystal oscillator has pin receptacles to allow the changing of the
MCP2120 oscillator frequency. For the tutorial, we will be using a crystal
frequency of 7.3728 MHz. This crystal frequency is shipped in the kit.
3.4.2.
Board Jumpers
The MCP2120 and MCP2150 Developer鈥檚 Boards may use one of two host
interfaces, the DB-9 interface to connect to a PC, or the header to connect to
a controller board.
For the tutorial, the host signal will come from the DB-9 connector and the
infrared data signals will interface to the Integrated Optical Transceiver.
Figure 3.2 shows how the two 3-pin jumpers need to be connected for this
configuration.
Figure 3.2: MCP2120 Developer鈥檚 Board Component Layout
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=F
OSC
/768
001=F
OSC
/384
010=F
OSC
/192
011=F
OSC
/128
100=F
OSC
/64
111=S/W
Baud
Open=0
MODE
RTS
Integrated
Transceiver
R13
C16
U6
C8
C10
R4
JP4
R10
U4
R5
R11
D1
D5
R12
R15
U5
(MCP2120)
Open=Enabled
R8
R7
R6
Component
Transceiver
J7
J6
C3
DB9
RX
J2
MCP2120
Developer鈥檚 Board
02-01608 Rev. 1
TX
J4
J1
Header
U1
J3
+5V
GND
These two jumpers select the
source of the Host signals.
J1 and J4
DB9 is source.
These two jumpers select the
optical transceiver logic. Both jumpers
should connect the same pin positions
J6 and J7
Integrated Transceiver
DS51246A-page 22
錚?/div>
2001 Microchip Technology Inc.

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