FT245BM DG245 93C46/56/66 245-5VB CSTCR6M00G15 MI0805K400R-00 245-5VS 93C46

FT245BM Designers Guide Version 2.0 Introduction Welcome to the FT245BM Designer's Guide. The Designers Guide includes printouts

FT245BM FT245BM Designers Guide FT245BM FT245BM Designers Guide Version 2.0 Introduction Welcome to the FT245BM FT245BM Designer's Guide. The Designers Guide includes printouts of a number of FT245BM FT245BM reference schematics and explanations of the key points of each schematic. These are intended to be used in conjunction with the FT245BM FT245BM data sheet, the current version of which should also be downloaded from the FTDI web site. The schematic files are downloadable separately as a ZIP archive which contains the schematics both in OrCAD SDT 16-bit DOS format and in OrCAD Capture for Windows 32-bit format. The OrCAD SDT 16-bit DOS format schematics are readable by OrCAD SDT version 3.2 and above. These consist of files with the following extensions · .sch = OrCAD 16-bit DOS binary schematic file · .lib = OrCAD 16-bit DOS binary component library file · .src = OrCAD DOS library source ( text ) file The OrCAD Capture for Windows schematics are readable by OrCAD Capture version 7.2 and above. These consist of a file with a .dsn extension. Notes for Protel users OrCAD 16-bit DOS schematics can be imported into Protel schematic capture for Windows. Before reading in the schematic ( .sch ) file, create a Protel library first by reading in the OrCAD library source ( .src ) file and save it in Protel binary library format. Both OrCAD and Protel use the same default extensions for schematic and library files, so if you do not wish to overwrite the original OrCAD files, save the Protel versions to a different folder. DG245 DG245 Version 2.0 © Future Technology Devices Intl. Ltd. 2002 / 2003 Page 1 of 14 CN1 CN-USB 5 C3 10uF VCC C2 0.1uF DECOUPLING CAPS 1 2 3 4 2 27R R4 R5 C1 0.1uF Y1 6MHz RESONATOR RSTOUT# C5 10nF VCC 27R FB1 FERRITE BEAD 1 R6 VCC C4 33nF R2 2k2 1k5 VCC 31 2 1 32 4 28 27 5 7 8 6 C6 0.1uF R3 470R TEST © Future Technology Devices Intl. Ltd. 2002 / 2003 CS SK DIN DOUT U1 VCC 10k R1 SI/WU RXF# TXE# WR RD# D7 D6 D5 D4 D3 D2 D1 D0 8 7 6 5 PWREN# VCC NC NC GND 93C46/56/66 93C46/56/66 ( Optional ) 1 2 3 4 EEDATA EESK EECS RESET# XTOUT XTIN RSTOUT# USBDP USBDM 3V3OUT 30 AVCC AGND 29 3 26 13 VCC VCC VCC-IO DG245 DG245 Version 2.0 GND GND VCC RSTOUT# R7 47k IO10 IO14 IO15 IO16 IO17 IO20 IO21 IO22 IO23 D3 D4 D5 D6 D7 RD# WR TXE# RXF# 22 21 20 19 18 16 15 14 12 VCC FT245BM FT245BM 10 VCC-5v FT245BM FT245BM 5v BUS POWERED EXAMPLE GND 5v MCU or Logic cct RESET# IO24 IO13 D2 23 PWREN# IO12 D1 24 11 IO11 D0 25 U2 VCC C7 0.1uF Figure 1.0 9 17 USB FT245BM FT245BM Designers Guide FT245BM FT245BM 5 volt Bus Powered Example Schematic ( 245-5VB 245-5VB ) Page 2 of 14 FT245BM FT245BM Designers Guide Figure 1.0 is an example of a 5 volt, USB bus powered design using the FT245BM FT245BM connected to a 5v MCU or other external logic. · In this example, we assume that the total current of the design is