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DLP Design DLP-USB245M, Руководство пользователя

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DLP-USB245M User Manual

Copyright © DLP Design 2002                                Page 8 of  15

Device Configuration Examples

USB Bus Powered and Self Powered Configuration

Figure 1

 illustrates a typical USB bus powered configuration. A USB Bus 

Powered device gets its power from the USB bus. Basic rules for USB Bus 
power devices are as follows –
a) On plug-in, the device must draw no more than 100mA
b) On USB Suspend the device must draw no more than 500uA.
c) A Bus Powered High Power Device ( one that draws more than 100mA ) 
should use the SLEEP# pin to keep the current below 100mA on plug-in and 
500uA on USB suspend.
d) A device that consumes more than 100mA can not be plugged into a USB 
Bus Powered Hub

Figure 1

e) No device can draw more that 500mA from the USB Bus.
f)

 

The power descriptor in the EEPROM should be programmed to a value of zero.

Figure 2

Figure 2

 illustrates a typical USB self powered 

configuration. A USB Self Powered device gets its power 
from its own Power Supply and does not draw current 
from the USB bus. 
Basic rules for USB Self power devices are as follows –
a) A Self-Powered device should not force current down 
the USB bus when the USB Host or Hub Controller is 
powered down.
b) A Self Powered Device can take as much current as it 
likes during normal operation and USB suspend as it has 
its own Power Supply.
c) A Self Powered Device can be used with any USB Host and both Bus and Self Powered USB Hubs.

Basic Bus-Powered

5V System

1

12

13

24

3

10

11

5.0V

12

3

10

11

8

data

RD#

TXE#

RXF#

WR

5.0V

Self-Powered

5V System

USB 'B'

Connector

DLP-USB245M

8

data

Microcontroller

RD#

TXE#
RXF#

WR

Basic Connection to a Microcontroller

Содержание DLP-USB245M

Страница 1: ...ired Integrated Power On Reset circuit Integrated 6MHz 48Mhz clock multiplier PLL USB Bulk or Isocronous data transfer modes 4 4v 5 25v Single Supply taken directly from the USB port UHCI OHCI EHCI host controller compatible USB 1 1 and USB 2 0 compatible USB VID PID Serial Number and Product Description Strings stored in on board EEPROM EEPROM programmable on board via USB VIRTUAL COM PORT VCP DR...

Страница 2: ...software Commands to set the baud rate are ignored the device always transfers data at its fastest rate regardless of the application s baud rate setting The latest versions of the drivers are available for download from DLP Design s website at http www dlpdesign com APPLICATION NOTES USB devices transfer data in packets If data is to be sent from the PC a packet is built up by the application pro...

Страница 3: ...ecture of the D2XX drivers consists of a Windows WDM driver that communicates with the FT245BM device via the Windows USB Stack and a DLL that interfaces the Application Software written in VC C Builder Delphi VB etc to the WDM driver An INF installation file uninstaller program and D2XX programmers guide complete the package The D2XX Direct Drivers add support for simultaneous access and control ...

Страница 4: ... have VCP drivers installed on the PC that is to perform the EEPROM write process you must uninstall these drivers using the uninstaller program included with the driver files and install the D2XX drivers prior to running the serializer utility QUICK START GUIDE This guide requires the use of a Windows 98 2000 PC that is equipped with a USB port 1 Download the DLL version of the device drivers fro...

Страница 5: ...M board from the USB cable Wait 10 seconds and reconnect the DLP USB245M board Reboot the PC if instructed to do so NOTE 1 The DLP USB245M comes pre programmed with a default VID and PID Step 5 is optional and only required if different VID PID codes are required NOTE 2 The Test button on the serializer program is intended for use with the DLP USB232M module and FT232BM device and will fail if use...

Страница 6: ...nternal clock starts up then clamps it s output to the 3 3v output of the internal regulator Taking RESET low will also force RSTOUT to go high impedance RSTOUT is NOT affected by a USB Bus Reset 5 Ground 6 3V3OUT Out Output from the integrated L D O regulator It s primary purpose is to provide the internal 3 3v supply to the USB transceiver cell and the RSTOUT pin A small amount of current 5mA ca...

Страница 7: ...buffer and is ready to be read with RD RXF goes high when the receive buffer is empty 14 TXE When high the FIFO s 385 byte transmit buffer is full or busy storing the last byte written Do not attempt to write data to the transmit buffer when TXE is high 15 WR In When taken from a high to a low state WR reads the 8 data lines and writes the byte into the FIFO s transmit buffer Data written to the t...

Страница 8: ...re that 500mA from the USB Bus f The power descriptor in the EEPROM should be programmed to a value of zero Figure 2 Figure 2 illustrates a typical USB self powered configuration A USB Self Powered device gets its power from its own Power Supply and does not draw current from the USB bus Basic rules for USB Self power devices are as follows a A Self Powered device should not force current down the...

Страница 9: ...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 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 f...

Страница 10: ...T4 Valid Data Hold Time from RD Inactive 10 ns T5 RD Inactive to RXF 5 25 ns T6 RXF inactive after RD cycle 80 ns Time Description Min Max Unit T7 WR Active Pulse Width 50 ns T8 WR to WR Pre Charge Time 50 ns T9 Data Setup Time before WR inactive 20 ns T10 Data Hold Time from WR inactive 10 ns T11 WR Inactive to TXE 5 25 ns T12 TXE inactive after RD cycle 80 Ns T6 T5 RXF T1 T2 RD T3 T4 D Descripti...

Страница 11: ...hanical Drawings PRELIMINARY Inches millimeters unless otherwise noted 1 5 typ 38 1 typ 235 typ 6 0 typ 50 typ 12 7 typ 65 typ 16 5 typ 32 typ 8 0 typ 10 typ 2 54 typ 19 typ dia 46 typ 6 typ 15 2 typ 7 typ 17 8 typ 16 typ 4 2 typ 52 typ dia 13 2 typ 36 typ dia 9 2 typ ...

Страница 12: ... Vcc 100mA DC Characteristics Ambient Temperature 0 70o C Operating Voltage and Current Parameter Description Min Typ Max Units Conditions Vcc1 VCC Operating Supply Voltage 4 4 5 0 5 25 V Vcc2 VCCIO Operating Supply Voltage 3 0 5 25 V Icc1 Operating Supply Current 25 mA Normal Operation Icc2 Operating Supply Current 350 400 uA USB Suspend FIFO IO Pin Characteristics VCCIO 5 0v Parameter Descriptio...

Страница 13: ...Output Voltage High 3 0 3 6 V I source 2mA Iol Leakage Current Tri State 5 uA USB IO Pin Characteristics Parameter Description Min Typ Max Units Conditions UVoh IO Pins Static Output High 2 8 3 6v V RI 1k5 to 3V3Out D RI 15k to GND D UVol IO Pins Static Output Low 0 0 3 V RI 1k5 to 3V3Out D RI 15k to GND D UVse Single Ended Rx Threshold 0 8 2 0 V UCom Differential Common Mode 0 8 2 5 V UVDif Diffe...

Страница 14: ... purpose is either made or implied DLP Design will not accept any claim for damages howsoever arising as a result of use or failure of this product Your statutory rights are not affected This product or any variant of it is not intended for use in any medical appliance device or system in which the failure of the product might reasonably be expected to result in personal injury This document provi...

Страница 15: ...3 D4 D2 WR RD RXF SND WUP TXE GND 3V3OUT GND 3V3OUT R6 100K CN1 USB Conn 1 2 3 4 C5 01 C4 1 C2 1 C1 1 C3 1 C7 033 J2 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 R9 470 U2 93C46 1 2 3 4 5 8 6 7 CS CLK DI DO GND VCC NC NC R3 27R C8 27pF R2 27R FB1 240 1018 1 1 2 R8 2 2K Y1 6MHz 1 2 3 R7 10K C6 10 10 Tant R5 100K R4 1 5K C9 27pF U1 FT245BM 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 ...

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