参数资料
| 型号： | DM163025 |
| 厂商： | Microchip Technology |
| 文件页数： | 15/48页 |
| 文件大小： | 0K |
| 描述： | PIC DEM FULL SPEED USB DEMO BRD |
| 标准包装： | 1 |
| 主要目的： | 接口，USB 2.0 主机/控制器 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | PIC18F2455/2550/4455/4550 |
| 主要属性： | 全速（12Mbps） |
| 次要属性： | MPLAB ICE 2000/4000 仿真器接口，温度传感器，扩展和 PICtail 接头 |
| 已供物品： | 板，缆线，CD |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
| 相关产品： | PIC18F4458T-I/PT-ND - IC PIC MCU FLASH 12KX16 44TQFP PIC18F4458T-I/ML-ND - IC PIC MCU FLASH 12KX16 44QFN PIC18F2458T-I/SO-ND - IC PIC MCU FLASH 12KX16 28SOIC PIC18F4458-I/PT-ND - IC PIC MCU FLASH 12KX16 44TQFP PIC18F2458-I/SP-ND - IC PIC MCU FLASH 12KX16 28SDIP PIC18F2458-I/SO-ND - IC PIC MCU FLASH 12KX16 28SOIC PIC18F4458-I/ML-ND - IC PIC MCU FLASH 12KX16 44QFN PIC18F4458-I/P-ND - IC PIC MCU FLASH 12KX16 40DIP PIC18F4553-I/PT-ND - IC PIC MCU FLASH 16KX16 44TQFP PIC18F4553-I/P-ND - IC PIC MCU FLASH 16KX16 40-DIP 更多... |
| 其它名称： | Q2086254 |
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Introduction to the PICDEM? FS USB Board
A USB host may send a query to a USB device to determine if it is currently
self-powered. Without an ability to sense the output of the 5V regulator (VR1), there
would be no way to determine the status of the power supply. The PICDEM FS USB
board uses two of the microcontroller ’s I/O pins (PORTA<2:1>) to sense which supply
is available: PORTA<2> monitors the regulator, while PORTA<1> senses the USB
cable. When a port is read as ‘ 1 ’, its corresponding power source is active. When a port
is read as ‘ 0 ’, its source is disconnected. The combinations of PORTA states are shown
For more details on power requirement and management, refer to Microchip applica-
tion note AN950, “Power Management for PIC18 USB Microcontrollers with nanoWatt
Technology” (DS00950).
TABLE 1-1:
PORTA<2:1> STATE COMBINATIONS AND THEIR MEANINGS
PORTA<1>
1
1
0
0
PORTA<2>
1
0
1
0
Status
USB cable and power supply are both connected; board is
self-powered, D8 is lit
USB cable is attached; board is bus-powered, D7 is lit
Power supply only is attached; board is self-powered, D8 is
lit
N/A
1.4.3
USB Interface
The PICDEM FS USB board utilizes the on-chip USB voltage regulator, transceivers
and pull-up resistors of the PIC18F4550. This helps reduce the number of external
components. The USB connection can be electrically detached by disabling the USB
module in the firmware. By disabling the USB module in firmware (setting the USBEN
bit in the UCON register to ‘ 0 ’), the on-chip USB voltage regulator will also be disabled.
This simulates the physical detachment of the USB cable.
FIGURE 1-3:
USB INTERFACE, SHOWING ON-CHIP COMPONENTS
USB Connector
1
2
3
V BUS (5V)
RC4/D-
PIC18F4550 (partial)
USB
Transceiver
4
RC5/D+
V USB
(3.3V)
1.5 k Ω
1.5 k Ω
USB 3.3V
Voltage
Regulator
470 nF
? 2008 Microchip Technology Inc.
DS51526B-page 11
相关PDF资料 |
PDF描述 |
|---|---|
| DM163028 | BOARD DEMO PICDEM LCD |
| DM163029 | BOARD PICDEM FOR MECHATRONICS |
| DM164130-3 | BOARD DEMO FOR PIC16F/PIC18F |
| DM183020 | BOARD DEMO PIC18FXX20 64/80TQFP |
| DM183021 | BOARD DEV PICDEM MC LV |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DM163025-1 | 功能描述:开发板和工具包 - PIC / DSPIC USB DEMO BOARD RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM163026 | 功能描述:开发板和工具包 - PIC / DSPIC L-Pow Sol Demo Brd RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM163027-2 | 功能描述:Zigbee/802.15.4开发工具 PICDEM Z ZIGBEE BRD RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:EM35x 频率:2.4 GHz 接口类型:USB 工作电源电压: |
| DM163027-4 | 功能描述:Zigbee/802.15.4开发工具 PICDEM Z ZIGBEE BRD RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:EM35x 频率:2.4 GHz 接口类型:USB 工作电源电压: |
| DM163027-5 | 功能描述:Zigbee/802.15.4开发工具 PICDEM Z MRF24J40 2.4 GhZ Dev Kit RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:EM35x 频率:2.4 GHz 接口类型:USB 工作电源电压: |
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