参数资料
| 型号： | DLP-USB245M-G |
| 厂商： | DLP Design Inc |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | MODULE USB-TO-TTL PARL FIFO CONV |
| 产品目录绘图： | DLP-USBxxxM-G |
| 标准包装： | 1 |
| 系列： | DLP-USB245M |
| 类型： | USB 至 FIFO |
| 连接器类型： | USB-B 至 DIL（双直插式） |
| 产品目录页面： | 635 (CN2011-ZH PDF) |
| 其它名称： | 813-1019 |
DLP-USB245M User Manual
3.3V
Figure 3
8
Microcontroller
data
3.3V
3
10
11
12
WR
RD#
TXE#
RXF#
Bus-Powered 5V
System with 3.3 Volt
Logic Interface
Figure 3 shows how to configure the DLP-USB245M to interface with a 3.3v logic device. In this example, the target
electronics provides the 3.3 volts via the VCCIO line (pin 10) which in turn will cause the FIFO interface IO pins to
drive out at 3.3v level.
Bus Powered Circuit with Power Control
USB Bus powered circuits need to be able to power down
in USB suspend mode in order to meet the <= 500uA total
suspend current requirement (including external logic).
Figure 4
P-Channel
Power MOSFET
S D
G
Microcontroller
Figure 4 shows how to use a discrete P-Channel Logic Level
MOSFET to control the power to external logic circuits. A
suitable device could be a Fairchild NDT456P or equivalent.
This configuration is suitable for powering external logic where
the normal supply current is <= 100mA and the logic to be
controlled does not generate an appreciable current surge
at power-up. For power switching external logic that takes
over 100mA or generates a current surge on powerup we
3
10
11
12
SLEEP#
Power Controlled by
SLEEP#
recommend that a dedicated power switch i.c with inbuilt “soft-start” is used instead of a MOSFET. A suitable power
switch i.c. for such an application would be a Micrel (www.micrel.com) MIC2025-2BM or equivalent.
Please note the following points in connection with power controlled designs –
a) The logic to be controlled must have it’s own reset circuitry so that it will automatically reset itself when power is re-
applied on coming out of suspend.
b) Set the soft pull-down option bit in the FT232BM EEPROM.
c) For 3.3v power controlled circuits VCCIO must not be powered down with the external circuitry (PWREN# gets it’s
VCC supply from VCCIO).
Copyright ? DLP Design 2002
Page 9 of 15
相关PDF资料 |
PDF描述 |
|---|---|
| DLP-USB245R | MODULE USB-TO-PARL FIFO 18-DIP |
| DM163001 | BOARD DEMO PICDEM-1 |
| DM163004-LT | BOARD DEMO PICDEM.NET |
| DM163005 | KIT EVAL PIC16C432/433 LIN BUSS |
| DM163007 | PICDEM CAN-LIN 1 FOR 18C658/858 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DLP-USB245R | 功能描述:界面模块 USB-TO-PARALLEL FIFO INTERFACE MODULE RoHS:否 制造商:4D Systems 产品:Serial Converters 通道/端口数量: 数据速率: 接口类型:USB, UART 工作电源电压:3.3 V, 5 V 最大工作温度: |
| DLP-UT1 | 功能描述:工业温度传感器 TEMPERATURE SENSOR RoHS:否 制造商:Texas Instruments 准确性:1 C 功能:Temperature Sensing 25 摄氏度时的电阻: 温度范围:- 55 C to + 127 C 电源电流: 电源电压:2.7 V to 5.5 V |
| DLP-UTH8 | 功能描述:数据记录与采集 DLP SENSOR HUB RoHS:否 制造商:Lantronix 描述/功能:Analog device server 显示器类型:None 电流额定值: |
| DLPVA-100-F | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Low Frequency Voltage Amplifier |
| DLPVA-100-F-D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Low Frequency Voltage Amplifier |
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