- 您现在的位置：买卖IC网 > Sheet目录1227 > MA180024 (Microchip Technology)MODULE PLUG-IN 18F46J50 FS USB
Board Hardware
The JP2 jumper allows the microcontroller firmware to monitor the USB_ATTACH signal
when the jumper cap is in the position, R - U.
The resistors, R15 and R17 of the schematics (see Appendix B. “Board Schematics” ),
serve multiple purposes. They level shift the +5V signal, provide a weak pull-down function
on the V BUS line (to oppose any leakage that would interfere with measuring V BUS in the
off/low state) and improve the ESD robustness of the circuit.
Peripherals that are purely bus-powered obtain all of their power directly from the +5V
V BUS line itself. For these types of devices, it is unnecessary to monitor when the V BUS
is powered as the peripheral will not be able to source current on the D+, D- or V BUS
lines when the host is not powered.
2.4.2
JP3 Jumper
If the PIC18F46J50 Full-Speed USB Demonstration Board is used as a stand-alone
device, it obtains its power from the USB cable. This requires jumper cap, JP3, to be
installed, since the jumper is in series with the power supply from the +5V V BUS pin
from the USB connector.
If the jumper cap is removed from JP3, a current meter can be connected across the
header to measure the current consumption from the USB cable. This enables
measurement of the total USB +5V V BUS current consumption, which is useful in
developing USB devices to meet USB compliance specifications.
The current consumption measured at the JP3 header will include the quiescent cur-
rent of the linear regulator, Q1, temperature sensor, U1, and the microcontroller, as well
as any leakage due to other circuitry on the board.
2.5
PROGRAMMING THE MICROCONTROLLER
The PIC18F46J50 Full-Speed USB Demonstration Board is too small to have the
full-sized RJ-11 jack normally used to connect to Microchip In-Circuit Serial Program-
ming? (ICSP?) programmers. Instead, the board has a six-pin ICSP header (J4) that
can be used as the connection for reprogramming the microcontroller.
The PICkit? 2 ICSP programmer can be connected directly to the J4 header.
Alternately, the six-pin, ICSP to RJ-11 adapter board, included with the board, can be
used to reprogram the microcontroller with other RJ-11 based programmers. Examples
of ICSP programmers that are supported (at the time this document’s publication)
include the MPLAB ? In-Circuit Debugger, ICD 2 and ICD 3, and the In-Circuit Emulator,
REAL ICE?.
When connecting to the six-pin header, ensure that the polarity and alignment are
correct. For reference, the board’s silk screen denotes pin 1 of the header (MCLR) with
an arrow and has a square surrounding the pin.
The RJ-11 to ICSP adapter board also provides a reference on its silk screen with a
square around the MCLR pin. When the adapter board connects correctly to the
demonstration board, the two square markings are aligned with each other.
If the PIC18F46J50 Full-Speed USB Demonstration Board is being used with the
PIC18 Explorer Board or PICDEM HPC Explorer Board, the board’s RJ-11 jack can
also be used to reprogram or debug the PIC18F46J50.
? 2009 Microchip Technology Inc.
DS51806A-page 12
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
MA180028
MOD PLUG-IN PIC18F87K22 PIM
MA2-4-34-625-2-A32-7C
CIRCUIT BREAKER MAG 25A PANEL MT
MA240013
MODULE PLUG-IN PIC24 44-PIN
MA240017
MODULE PLUG-IN PIC24F16KA102 PIM
MA240021
MOD PLUG-IN PIC24FJ256GB210
MA240025-1
MOD PIM PIC24EP512GU810 GP
MA240026
MODULE PLUG-IN PIC24FJ16MC102
MA300013
MODULE DSPIC30F SAMPLE 80QFP
相关代理商/技术参数
MA180025
功能描述:子卡和OEM板 PIM for PIC18F87J90 w/ Cap Touch buttons RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
MA180026
功能描述:子卡和OEM板 PIC18F45K20 44P TQFP to 84P PIM RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
MA180027
功能描述:子卡和OEM板 PIC18F87K90 PIM w/ Cap Touch
RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
MA180028
功能描述:子卡和OEM板 PIC18F87K22 Plug-In Module
RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
MA180029
功能描述:子卡和OEM板 PIC18F47J53 FS USB Demo Board
RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
MA180030
功能描述:子卡和OEM板 PIC18F47J31 Plug-in Module RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
MA180031
功能描述:子卡和OEM板 PIC18F46K80 PIM RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
MA180032
功能描述:子卡和OEM板 PIC18F66K80 PIM RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit