FB1 1 USB 2 VCC VCC VCC FERRITE BEAD CN1 CN-USB C10 10nF 1 2 3 4 R5 470R VCC R6 27R 8 R7 27R 7 3V3OUT TXD RXD USBDM RTS# USBDP CTS# DTR# R8 5 RSTOUT# DSR# 1k5 27 Y1 6MHz RESONATOR DCD# XTIN RI# TXDEN 28 4 VCC XTOUT PWREN# RESET# PWRCTL TXLED# 31 RXD 23 RTS# 22 CTS# 21 DTR# 20 DSR# 19 DCD# 18 RI# TX D1 LED D2 LED R1 220R R2 220R SLEEP# EEDATA TEST VCC RX RI DTR CTS TXDATA RTS RXDATA DSR DCD SHIELD 16 U1 15 14 TXD DTR# RTS# 7 6 20 21 CTS DSR DCD RXDATA RI 9 4 27 23 18 SLEEP# VCC 25 24 12 11 EESK 29 VCC TXD 24 SLEEP# 10 GND GND 2 DECOUPLING CAPS AGND 1 RXLED# EECS FT232BM 9 17 32 25 VCC C5 0.1uF 13 12 14 C4 10uF C3 0.1uF C1 0.1uF C2 0.1uF VCC U3 GND 1 2 3 4 R4 2k2 CS SK DIN DOUT VCC NC NC GND 5 9 4 8 3 7 2 6 1 10 6 AVCC SHIELD U2 3 26 13 30 C11 0.1uF VCC VCC VCC-IO 5 C9 33nF SKT1 DB9M VCC 8 7 6 5 C6 0.1uF 10 T1IN T2IN T3IN T4IN T1OUT T2OUT T3OUT T4OUT R1IN R2IN R3IN R4IN R5IN R1OUT R2OUT R3OUT R4OUT R5OUT 2 3 1 28 TXDATA DTR RTS 8 5 26 22 19 CTS# DSR# DCD# RXD RI# SHDN# EN V+ V- C1+ C1- C2+ C2- GND VCC 17 C7 0.1uF VCC 15 16 11 C8 0.1uF MAX213CAI MAX213CWI ADM213E SP213ECA Max Baud = 115k 93C46/56/66 ( Optional ) SP213EHCA R3 Max Baud = 460k 10k FT232B APPLICATION SCHEMATIC USB <=> RS232 SERIAL CONVERTER ( 300 to 115k/460k baud )