收藏本站
MCP215X/40 Developer’s Daughter Board User’s Guide
2.5.3.2
MCP2140 WAVESHAPING CIRCUITRY
If the MCP2140 is to be used, then the Optical Transceivers’s RXD signal needs to be
conditioned to be used as the input to the MCP2140’s RXPD/RXPDREF signals.
Figure 2-7 shows the circuit that is used to shape the waveform of the optical Trans-
ceiver ’s RXD output. This is done to ensure that the RXD pulse width does not exceed
the specifications of the MCP2140 RXPD input (IR131A) (refer to Parameter IR131A
in the MCP2140 Data Sheet, DS21790). The resistor divider R18 and R13 sets the
RXPDREF reference threshold. Transistor Q6 (MMUN2111LT1) has internal resistors.
If you wish to evaluate a simple PNP device, Q6 can be replaced and resistors for R15
and R20 may need to be added. If R20 is added, do not forget to cut the trace that
shorts out the resistor. Modifications to this waveshaping circuit may be required
depending on your operating requirements (voltage, temperature, etc.).
FIGURE 2-7:
MCP2140 RXPD WAVEFORM SHAPING CIRCUIT
V D D
V D D
R14
100 Ω
TP1
RXPDREF
RXPDREF
TP2
RXPD
R19
10 k Ω
Q6
1
R15
OPT
R20
OPT
C14
47 pF
RXD
(From Optical
Transceiver)
2.5.4
RXPD
Signal Header
R13
10 k Ω
R16
4.7 k Ω
MMUN2111LT1
To allow easy access to many of the system signals, two headers (HD1 and HD2) are
on one of the edges of the board. This allows the signals from the MCP215X or
MCP2140 to be easily accessed and connected into an existing application for initial
development or proof-of-concept.
FIGURE 2-8:
14-PIN SIGNAL INTERFACE HEADER HD1
DS51591A-page 30
HD1
HD2
? 2006 Microchip Technology Inc.
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
MCP215XDM BOARD DEMO FOR MCP215X
MCP23X08EV BOARD EVALUATION FOR MCP23X08
MCP23X17EV BOARD EVAL FOR MCP23X17
MCP2515DM-PTPLS BOARD DAUGHTER PICTAIL MCP2515
MCP3905EV BOARD DEMO FOR MCP3905
MCP402XEV BOARD EVAL FOR MCP402X
MCP42XXEV BOARD EVALUATION MCP42XX
MCP43XXEV BOARD EVALUATION MCP43XX
相关代理商/技术参数
MCP215XDM 功能描述:界面开发工具 MCP215X Data Logger Demo Board RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V
MCP2200 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:USB 2.0 to UART Protocol Converter with GPIO
MCP2200_11 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:USB 2.0 to UART Protocol Converter with GPIO
MCP2200_13 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:USB 2.0 to UART Protocol Converter with GPIO
MCP-220-00001-01 制造商:Supermicro Computer Inc 功能描述:HOT-SWAPPABLE HARD DRIVE TRAY BLACK - Bulk
MCP-220-00001-03 制造商:SUPER MICRO COMPUTER, INC. 功能描述:HOT-SWAP 3.5" DRIVE TRAY, SILVER - Bulk
MCP-220-00001-03(01) 制造商:SUPER MICRO COMPUTER, INC. 功能描述:SUPERMICRO SCA TRAY, BLACK - Bulk
MCP-220-00003-01 制造商:SUPER MICRO COMPUTER, INC. 功能描述:1U SPARE HOT SWAP DRIVE- BLACK (2ND GENERATION) - Bulk