VCC DTR# TXD 3 2 1 5 4 RXD 6 7 RI# 8 DCD# 11 10 9 CTS# 12 DSR# SLEEP# 13 14 ** RTS# DTR# TXD AGND TEST OSCI OSCO U1 VCCIO CBUS0 AVCC RI# GND CBUS1 VCC3I VCC5I RESET# VCC3O DCD# CBUS4 USBDM GND CBUS2 USBDP CTS# DSR# GND RXD 2 CBUS3 FB1 FT232R 1 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC * C3 * 47pF 10nF GND 47pF 10nF C2 FERRITE BEAD * C1 10nF GND GND VCC GND GND C10 100nF 10nF VCC DTR TXDATA VCC 1 2 3 4 RTS RXDATA 6 5 RTS# 8 7 DSR# 14 13 12 11 10 9 TXD RXD GND DSR C4 100nF 10nF C5 100nF 10nF GND C1+ VCC GND R1I R1O T1I T2I R2O R2I T2O T1O T3O C2- V- R5I R5O T3I T4I R4O R4I EN SD R3O R3I T4O U2 V+ C2+ C8 100nF 10nF C1ZT213E C9 4.7uF FT232R APPLICATION SCHEMATIC 27 CTS# CTS VCC 26 SLEEP# 28 25 RI 24 23 RI# 19 20 DCD DCD# DTR# 17 16 15 100nF 10nF C7 18 21 22 VCC "ChiPi" MINIMAL COMPONENT USB SERIAL ADAPTOR GND RI DTR CTS TXDATA RTS RXDATA DSR DCD ** C6 100nF 10nF SHIELD 5 9 4 8 3 7 2 6 1 Optional - may be required to reduce EMI emissions GND * NOTES ** The shield wire of the USB cable should be soldered to the DB9 outer can DB9M PL1 10 RTS# GND 1 2 3 4 GND SHIELD + USB CN-USB CN1 5