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參數(shù)資料
| 型號： | MCP2140 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | IrDA Standard Protocol Stack Controller With Fixed 9600 Baud Communication Rate(固定波特率,低成本,IrDA標(biāo)準(zhǔn)協(xié)議編譯碼器) |
| 中文描述： | 標(biāo)準(zhǔn)的IrDA協(xié)議?？刂破?，固定通信速率9600波特（固定波特率，低成本，紅外標(biāo)準(zhǔn)協(xié)議編譯碼器） |
| 文件頁數(shù)： | 17/58頁 |
| 文件大小： | 1001K |
| 代理商： | MCP2140 |
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2003 Microchip Technology Inc.
Preliminary
DS21790A-page 17
MCP2140
2.13
Optical Interface
The MCP2140 requires an infrared transceiver for the
optical interface. This transceiver can be a single-chip
solution (integrated) or be implemented with discrete
devices.
2.13.1
DISCRETE TRANSCEIVER
SOLUTION
The MCP2140 was designed to use a discrete imple-
mentation that allows the lowest system power
consumption as well as a low cost implementation.
Figure 2-12
transceiver circuit.
shows
a
typical
discrete
optical
FIGURE 2-11:
CIRCUIT FOR A
DISCRETE OPTICAL
TRANSCEIVER
Care must be taken in the design and layout of the
photo-detect circuit, due to the small signals that are
being detected and their sensitivity to noise.
2.13.2
INTEGRATED TRANSCEIVER
The MCP2140 was designed to use a discrete imple-
mentation that allows the lowest system power con-
sumption and a low cost implementation (see
Section 2.12.1, “Discrete Transceiver Solution”). It is
possible to use an integrated optical transceiver solu-
tion, with the addition of four components. Two com-
ponents are required to condition the input signal to
ensure that the RXIR pulse width is not greater than
1.5 μs (see
Parameter IR131A
). The other two com-
ponents are required to set the RXIR signal trip point
(typically V
DD
/2).
Figure 2-12
shows an example
MCP2140 optical transceiver circuit, using a Vishay
/
Temic TFDS4500.
FIGURE 2-12:
CIRCUIT FOR AN
INTEGRATED OPTICAL
TRANSCEIVER
Table 2-6
shows a list of common manufacturers of
integrated optical transceivers.
This figure will be available in Revision B of the
MCP2140 data sheet. Please conact the Microchip
factory via email (tech.support@microchip.com)
for additional information.
+5 V
+5 V
R11
22
TFDS4500
U6
8
7
6
5
47
R13
1
2
3
4
C18
.1 μF
RXPD
(To
MCP2140
Pin 2)
TXIR
(To
MCP2140
Pin 18)
+5 V
C19
(1)
Q1
(1)
MUN211T1
68 pF
+5 V
RXPDREF
(To
MCP2140
Pin 1)
10 k
R14
(2)
10 k
R15
(2)
Note 1:
These components are used to control
the width of the TFDS4500 RXD output
signal. Q1 is a digital transistor, which
includes the bias resistors.
2:
These components are used to set the
reference voltage that the RXPD signal
needs to cross to “detect” a bit.
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