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| 型号： | MCP2140T-I/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 9/58页 |
| 文件大小： | 0K |
| 描述： | IC IRDA CONTROLLR DTE/DCE 20SSOP |
| 标准包装： | 1,600 |
| 控制器类型： | IRDA 标准协议栈控制器 |
| 接口： | UART |
| 电源电压： | 3 V ~ 5.5 V |
| 电流 - 电源： | 2.2mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 带卷 (TR) |
| 配用： | MCP2140DM-TMPSNS-ND - BOARD DEMO FOR 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.
shows
a
typical
discrete
optical
transceiver circuit.
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 s (see Parameter IR131A). The other two com-
ponents are required to set the RXIR signal trip point
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
R11
22
TFDS4500
U6
8
7
6
5
47
R13
1
2
3
4
C18
.1 F
RXPD
(To MCP2140 Pin 2)
TXIR
(To MCP2140 Pin 18)
+5 V
C19 (1)
Q1 (1)
68 pF
MUN211T1
+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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