CN-USB CN1 USB SHIELD 5 6MHz RESONATOR 27R R2 Y1 27R VCC R1 2 US232B Application Schematic 1 2 3 4 C1 10nF FERRITE BEAD 1 FB1 VCC232 1k5 R3 C2 33nF R5 2k2 VCC FB2 31 2 1 32 4 28 27 5 7 8 6 C3 0.1uF R4 470R TEST 1 2 3 4 EEDATA EESK EECS RESET# XTOUT XTIN RSTOUT# USBDP USBDM 3V3OUT FERRITE BEAD 1 2 30 VCC232 AVCC AGND 10k R6 93C46 CS SK DIN DOUT U2 29 3 26 13 VCC VCC VCC-IO RI# DCD# DSR# DTR# CTS# RTS# RXD 8 7 6 5 SLEEP# RXLED# TXLED# PWRCTL PWREN# RTS# CTS# DTR# DSR# DCD# RI# 23 22 21 20 19 18 VCC FT232BM 10 11 12 14 15 SLEEP# RXD 24 16 TXD 25 10nF C6 TXD 33nF C5 U1 0.1uF C4 TXDEN VCC NC NC GND GND GND 9 17 VCC TX R7 220R LED1 LED RED C8 0.1uF C7 0.1uF VCC RX VCC R8 220R 10 12 14 13 25 24 9 4 27 23 18 CTS DSR DCD RXDATA RI SLEEP# 7 6 20 21 TXD DTR# RTS# LED2 LED GREEN RI DTR CTS TXDATA RTS RXDATA DSR DCD C12 C11 0.1uF VCC C2+ C2- V- R1OUT R2OUT R3OUT R4OUT R5OUT T1OUT T2OUT T3OUT T4OUT SHIELD 10uF SP213EHCA GND C1+ C1- V+ SHDN# EN R1IN R2IN R3IN R4IN R5IN T1IN T2IN T3IN T4IN U3 5 9 4 8 3 7 2 6 1 DB9M SKT1 10 11 15 16 17 8 5 26 22 19 2 3 1 28 C10 0.1uF C9 0.1uF CTS# DSR# DCD# RXD RI# TXDATA DTR RTS VCC