Download: FT8U232AM U-UART - USB UltraBaud Data Transfer IC with RS232 / RS422 and CPU I/F Options FEATURES

FT8U232AM U-UART - USB UltraBaud Data Transfer IC with RS232 / RS422 and CPU I/F Options FEATURES

• Single Chip Multi-Function Data Transfer Virtual COM Port Drivers for – Solution Windows 98 and Windows 98 SE • RS232 link from 300 baud to 920K baud Windows 2000 • RS422/RS485 Link to 2000K baud Windows Millennium ** • 384 byte receive buffer / 128 byte transmit Apple iMAC ** buffer for high data throughput Linux ** • Full hardware assisted or X-On/X-Off • Application Areas handshaking USB ISDN and ADSL Modems • Support for Event Characters and Line Break USB 56k / V90 Modems condition USB Ù PDA Interface Cables • Auto Transmit Buffer control for RS485 USB Ù RS232 Converters / Cables • Compact 32 pin ( 7mm x 7mm ) MQFP package USB Ù RS422 / RS485 High Speed Industrial • Integrated 6MHz - 48MHz Clock Multiplier aids Links FCC and CE compliance USB Digital Cameras • Integrated 3.3v Regulator – No External USB I/F for MP3 players Regulator Required Ultra-high performance Serial Port for legacy - • 4.4v .. 5.25v Single Supply Operation free PC system boards / Easy PC’s • UHCI / OHCI Compliant USB Instrumentation • USB 1.1 Specification Compliant USB Ù USB data transfer cables • USB VID, PID, Serial Number and Product USB Ù USB null-modem cables Description Strings in external E2PROM. USB ÙSerial Bar Code Readers Note ** = Currently in development

GENERAL DESCRIPTION

The FT8U232AM is a cost-effective single chip USB UART ( U-UART ) solution for transferring serial data over USB. With data transfer rates of up to 920k baud ( RS232 ) and 2,000 k baud ( RS422 / RS485 ) , the FT8U232AM significantly raises the performance level above that above that of traditional ISA and PCI based UART solutions whilst offering true plug and play and easy interfacing through it’s USB interface. Its flexible architecture allows this IC to be used in many different application areas - USB modems, Legacy RS232 Ù USB Converter cables, USB interface cables for PDA’s , Bar Code Scanners , RS422 data links and instrumentation – in fact almost any equipment that previously used a slow RS232 link for communication. Virtual COM port drivers are available for the FT8U232AM for Windows ’98, Windows 98 SE and Windows 2000. Drivers for other operating systems are currently under development.,

Figure 1 – FT8U232AM Block Diagram ( Simplified ) VCC

48MHz Baud Rate Generator 3.3 Volt 3V3OUT LDO Dual Port TX Regulator Buffer 128 bytes TXD

RXD

RTS# CTS# DTR# DSR# USBDP DCD# Serial Interface USB USB UART UART RI# Engine Transceiver Protocol Engine FIFO Controller USBDM ( SIE )

TXDEN USBEN

TXLED# RXLED# Dual Port RX Buffer USB DPLL 384 Bytes

EECS

EEPROM EESK Interface EEDATA XTOUT 48MHz GND 6MHZ x8 Clock RESET# Oscillator Multiplier SLEEP# XTIN 12MHz TEST

PWRCTL RCCLK Figure 2 – FT8U232AM I.C. Pinout

32 25 EESK 1 24 RXD EEDATA RTS# VCC FTDI CTS# RESET# DTR# TEST FT232AM DSR# 3V3OUT DCD# USBDP RI# USBDM 8 XXYY 17 GND 9 16 GND EECS SLEEP# RCCLK RXLED# AVCC TXLED# AGND VCC XTOUT PWRCTL XTIN USBEN VCC TXDEN TXD,

FT8U232AM - FUNCTIONAL BLOCK DESCRIPTION

• 3.3V LDO Regulator The 3.3V LDO Regulator generates the 3.3 volt reference voltage for driving the USB transceiver cell output buffers. It requires an external decoupling capacitor to be attached to the 3V3OUT regulator output pin. • USB Transceiver The USB Transceiver Cell provides the USB 1.1 full-speed physical interface to the USB cable. The output drivers provide 3.3 volt level slew rate control signalling, whilst a differential receiver and two single ended receivers provide USB data in, SEO and USB Reset condition detection. • USB DPLL The USB DPLL cell locks on to the incoming NRZI USB data and provides separate recovered clock and data signals to the SIE block. • 6MHz Oscillator The 6MHz Oscillator cell generates a 6MHz reference clock input to the X8 Clock multiplier from an external 6MHz crystal or ceramic resonator. • X8 Clock Multiplier The X8 Clock Multiplier takes the 6MHz input from the Oscillator cell and generates a 12MHz reference clock for the SIE, USB Protocol Engine and UART FIFO controller blocks. It also generates a 48MHz reference clock for the USB DPPL and the Baud Rate Generator blocks. • Serial Interface Engine ( SIE ) The Serial Interface Engine ( SIE ) block performs the Parallel to Serial and Serial to Parallel conversion of the USB data. In accordance to the USB 1.1 specification, it performs bit stuffing / un-stuffing and CRC5 / CRC16 generation / checking on the USB data stream. • USB Protocol Engine The USB Protocol Engine manages the data stream from the device USB control endpoint. It handles the low level USB protocol ( Chapter 9 ) requests generated by the USB host controller and the commands for controlling the functional parameters of the UART. • Dual Port TX Buffer ( 128 bytes ) Data from the USB data out endpoint is stored in the Dual Port TX buffer and removed from the buffer to the UART transmit register under control of the UART FIFO controller., • Dual Port RX Buffer ( 384 bytes ) Data from the UART receive register is stored in the Dual Port RX buffer prior to being removed by the SIE on a USB request for data from the device data in endpoint. • UART FIFO Controller The UART FIFO controller handles the transfer of data between the Dual Port RX and TX buffers and the UART transmit and receive registers. • UART The UART performs asynchronous 7 / 8 bit Parallel to Serial and Serial to Parallel conversion of the data on the RS232 ( RS422 and RS485 ) interface. Control signals supported by the UART include RTS, CTS, DSR , DTR, DCD and RI. The UART provides a transmitter enable control signal ( TXDEN ) to assist with interfacing to RS485 transceivers. • Baud Rate Generator The Baud Rate Generator provides a x16 clock input to the UART from the 48MHz reference clock and consists of a 14 bit prescaler and 2 register bits which provide fine tuning of the baud rate ( e.g. to divide by 2.5 ). This determines the Baud Rate of the UART which is programmable from 300 baud to 2 million baud. For more details please contact FTDI. • EEPROM Interface Though the FT8U232AM will work without the optional EEPROM, an external 93C46 EEPROM can be used to customise the USB VID, PID, Serial Number and Strings of the FT8U232AM for OEM applications. The EEPROM is also required for applications where multiple FT8U232AM’s are connected to a single PC as the drivers rely on a unique serial number for each device to bind a unique virtual COM port to each individual device.,

Table 1 - FT8U232AM - PINOUT DESCRIPTION

Pin # Signal Type Description 7 USBDP I/O USB Data Signal Plus – Requires 1.5k pull-up to 3V3OUT 8 USBDM I/O USB Data Signal Minus 6 3V3OUT OUT 3.3 volt Output from integrated regulator 27 XTIN IN Input to 6MHz Crystal Oscillator Cell 28 XTOUT OUT Output from 6MHz Crystal Oscillator Cell 31 RCCLK I/O RC timer – used to guarantee clock stability on exiting sleep mode 4 RESET# IN Resets entire device using external RC network 32 EECS I/O Optional EEPROM – Chip Select 1 EESK I/O Optional EEPROM – Clock 2 EEDATA I/O Optional EEPROM – Data I/O 5 TEST IN Puts device in i.c. test mode – must be tied to GND 25 TXD OUT UART – Transmit Data Output 24 RXD IN UART – Receive Data Input 23 RTS# OUT UART – Request To Send Control Output 22 CTS# IN UART – Clear To Send Control Input 21 DTR# OUT UART – Data Terminal Ready Control Output 20 DSR# IN UART – Data Set Ready Control Input 19 DCD# IN UART – Data Carrier Detect Control Input 18 RI# IN UART – Ring Indicator Control Input 16 TXDEN OUT UART – Enable Transmit Data for RS485 15 USBEN OUT USB Enabled – High after device is configured via USB 14 PWRCTL IN Bus Powered – Tie Low / Self Powered – Tie High 12 TXLED# O.C. LED Drive - Pulses Low when Transmitting Data via USB 11 RXLED# O.C. LED Drive - Pulses Low when Receiving Data via USB 10 SLEEP# OUT Goes Low during USB Suspend Mode 3,13,26 VCC PWR Device - +4.4 volt to +5.25 volt Power Supply Pins 9.17 GND PWR Device – Ground Supply Pins 30 AVCC PWR Device - Analog Power Supply for the internal x8 clock multiplier 29 AGND PWR Device - Analog Ground Supply for the internal x8 clock multiplier,

Figure 3. FT8U232AM - PACKAGE DESCRIPTION – QFP 7mm x 7mm

7 9 0.8 Pin # 1 1 0.37 +/- 0.07 12o +/- 1o 0.09 Min 0.09 Min 0.2 Max 0.16 Max 0.25 0.35 +/- 0.05 0.05 Min 0.15 Max 0.2 Min All dimensions in 0.6 +/- 0.15 millimetres 1.60 MAX 1.4 +/- 0.05,

Absolute Maximum Ratings

Storage Temperature ……………………………………………………. -65oC to + 150oC Ambient Temperature ( Power Applied )……………………………….. 0oC to + 70oC VCC Supply Voltage ……………………………………………….…….. -0.5v to +6.00v DC Input Voltage - Inputs ……………………………………………….. -0.5v to VCC + 0.5v DC Input Voltage - High Impedance Bidirectionals …………………… -0.5v to VCC + 0.5v DC Output Current – Outputs …………………………………………… 24mA DC Output Current – Low Impedance Bidirectionals …………………. 24mA Power Dissipation ………………………………………………………… 500mW DC Characteristics ( Ambient Temperature = 0 .. 70 Degrees C ) Description Min Max Units Conditions VCC Operating Supply Voltage 4.4 5.25 v Icc1 Operating Supply Current 50 mA Normal Operation Icc2 Operating Supply Current 250 uA USB Suspend Ioh1 Digital IO Pins Source Current 4 mA Voh = VCC – 0.5v Iol1 Digital IO Pins Sink Current 8 mA Vol = + 0.5v Voh1 Input Voltage Threshold ( Low ) 0.6 v Vol1 Input Voltage Threshold ( High ) 2.7 v VDif USB Differential Input Sensitivity 0.2 v VCom USB Differential Common Mode 0.8 2.5 v URxt USB Single Ended Rx Threshold 0.8 2.0 v UVh USB IO Pins Static Output ( Low ) 0.3v Rl = 1.5k to 3.6v UVl USB IO Pins Static Output ( High ) 2.8 Rl = 15k to GND,

Disclaimer

© Future Technology Devices International Limited – 1999, 2000 Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or reproduced in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are supplied on an as is basis and no warranty as to their suitability for any particular purpose is either made or implied. Future Technology Devices International Ltd. 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 provides preliminary information that may be subject to change without notice.

Contact Information

Future Technology Devices Intl. Limited Telephone : +44 ( 0 ) 141 353 2565 St. George’s Studios Fax : +44 ( 0 ) 141 353 2656 93/97 St. George’s Road Email : email is hidden Glasgow G3 6JA, UK Internet : http://www.ftdi.co.uk

Agents and Sales Representatives

Please visit our internet site for the latest contact details of our Agents and Sales Representatives world-wide., Appendix A USB Device Descriptors,

USB Device Descriptors

Note: E - replaced by E2Rom Value, C - modified by configuration option {* device descriptor *} LABEL : Device_Des; 0010 12 Val : Device_Len;{length of this descriptor in bytes} 0011 01 Val : $01;{Device descriptor type} 0012 10 01 Val : $10,$01;{USB Spec rev 1.10} 0014 00 Val : $00;{Device class ?} 0015 00 Val : $00;{Device subclass ?} 0016 00 Val : $00;{Device protocol ?} 0017 08 Val : Max_Length;{maximum packet size} LABEL : Device_Des_Vendor; E 0018 03 04 Val : $03,$04;{Vendor ID FTDI} E 001A 01 60 Val : $01,$60;{product number 6001} LABEL : Device_Des_Vendor_End; E 001C 00 02 Val : $00,$02;{device release number 02.00} 001E 01 Val : $01;{index of string descriptor describing manufacturer} 001F 02 Val : $02;{index of string descriptor describing product} 0020 03 Val : $03;{index of string descriptor describing serial number} 0021 01 Val : $01;{number of possible configurations} {* end of device descriptor *} LABEL : Device_Des_End; LABEL : Config_Des; {* configuration descriptor *} 0022 09 Val : $09;{length of this descriptor in bytes} 0023 02 Val : $02;{Configuration descriptor} 0024 20 00 Val : Config_Len,$00;{length of data returned for all things} 0026 01 Val : $01;{number of interfaces supported by this configuration} 0027 01 Val : $01;{configuration value} 0028 00 Val : $00;{index of string descriptor describing this configuration} EC 0029 80 Val : 10000000b;{configured as bus powered and not remote wakeup} E 002A 2D Val : 45;{maximum power in 2 mA ie 90mA for now} {* end of configuration descriptor *} LABEL : Interface_Des; {* interface descriptor *} 002B 09 Val : $09;{length of this descriptor in bytes} 002C 04 Val : $04;{Interface descriptor} 002D 00 Val : $00;{interface number} 002E 00 Val : $00;{alternate setting} 002F 02 Val : $02;{number of endpoints excluding 0 = 1} 0030 FF Val : $ff;{class code} 0031 FF Val : $ff;{subclass} 0032 FF Val : $ff;{protocol code} 0033 02 Val : $02;{index of string descriptor describing this interface} {* end of interface descriptor *} LABEL : Interface_Des_End; LABEL : Endpoint_Des; LABEL : Endpoint3_Des_End; 0034 07 Val : $07;{length of this descriptor in bytes} 0035 05 Val : $05;{End point descriptor} 0036 81 Val : 10000001b;{in endpoint at address 1} 0037 02 Val : 00000010b;{attribute as bulk} 0038 40 00 Val : 64,$00;{maximum packet size} 003A 00 Val : $00;{interval for polling endpoint for data transfers}, LABEL : Endpoint3_Des; {* end point descriptor *} 003B 07 Val : $07;{length of this descriptor in bytes} 003C 05 Val : $05;{End point descriptor} 003D 02 Val : 00000010b;{out endpoint at address 2} 003E 02 Val : 00000010b;{attribute as bulk} 003F 40 00 Val : 64,$00;{maximum packet size} 0041 00 Val : $00;{interval for polling endpoint for data transfers} LABEL : Endpoint_Des_End; LABEL : Config_Des_End; LABEL : Str0_Des; 0042 04 Val : Str0_Len; {length of string descriptor} 0043 03 Val : $03; {type string} 0044 09 04 Val : $09,$04; {language ID 0009 English} LABEL : Str0_Des_End; LABEL : Str1_Des; E 0046 0A Val : Str1_Len; {length of string descriptor} E 0047 03 Val : $03; {type string} E 0048 46 00 Val : 'F',$00; E 004A 54 00 Val : 'T',$00; E 004C 44 00 Val : 'D',$00; E 004E 49 00 Val : 'I',$00; LABEL : Str1_Des_End; LABEL : Str2_Des; E 0050 1E Val : Str2_Len; {length of string descriptor} E 0051 03 Val : $03; {type string} E 0052 55 00 Val : 'U',$00; E 0054 53 00 Val : 'S',$00; E 0056 42 00 Val : 'B',$00; E 0058 20 00 Val : ' ',$00; E 005A 3C 00 Val : '<',$00; E 005C 2D 00 Val : '-',$00; E 005E 3E 00 Val : '>',$00; E 0060 20 00 Val : ' ',$00; E 0062 53 00 Val : 'S',$00; E 0064 65 00 Val : 'e',$00; E 0066 72 00 Val : 'r',$00; E 0068 69 00 Val : 'i',$00; E 006A 61 00 Val : 'a',$00; E 006C 6C 00 Val : 'l',$00; LABEL : Str2_Des_End; LABEL : Str3_Des; E 006E 12 Val : Str3_Len; {serial number string} E 006F 03 Val : $03; {type string} E 0070 31 00 Val : '1',00; E 0072 32 00 Val : '2',00; E 0074 33 00 Val : '3',00; E 0076 34 00 Val : '4',00; E 0078 35 00 Val : '5',00; E 007A 36 00 Val : '6',00; E 007C 37 00 Val : '7',00; E 007E 38 00 Val : '8',00; LABEL : Str3_Des_End;, Appendix B EEPROM Data Structure,

E2Rom Data example

0000 00 00 Val : $00,$00;{Configuration value} 0002 03 04 Val : $03,$04;{Vendor ID FTDI} 0004 01 60 Val : $01,$60;{product number 6001} 0006 00 02 Val : $00,$02;{device release number} 0008 A0 Val : 10100000b; {config descriptor value bus powered and remote wakeup} 0009 2D Val : 45; {max power = value * 2 mA} 000A 00 00 Val : $00,$00;{reserved} 000C 00 00 Val : $00,$00;{reserved} 000E 94 VAL : PTR_ManStringDes; 000F 0C Val : ManStringDes_Len; {length of string descriptor} 0010 A0 VAL : PTR_ProdStringDes; 0011 34 Val : ProdStringDes_Len; {length of string descriptor} 0012 D4 VAL : PTR_SerStringDes; 0013 12 Val : SerStringDes_Len; LABEL : ManStringDes; 0014 0C Val : ManStringDes_Len; {length of string descriptor} 0015 03 Val : $03; {type string} 0016 41 00 Val : 'A',$00; 0018 6E 00 Val : 'n',$00; 001A 64 00 Val : 'd',$00; 001C 79 00 Val : 'y',$00; 001E 73 00 Val : 's',$00; LABEL : ManStringDes_End; LABEL : ProdStringDes; 0020 34 Val : ProdStringDes_Len; {length of string descriptor} 0021 03 Val : $03; {type string} 0022 57 00 Val : 'W',$00; 0024 6F 00 Val : 'o',$00; 0026 6E 00 Val : 'n',$00; 0028 64 00 Val : 'd',$00; 002A 65 00 Val : 'e',$00; 002C 72 00 Val : 'r',$00; 002E 66 00 Val : 'f',$00; 0030 75 00 Val : 'u',$00; 0032 6C 00 Val : 'l',$00; 0034 6C 00 Val : 'l',$00; 0036 20 00 Val : ' ',$00; 0038 55 00 Val : 'U',$00; 003A 53 00 Val : 'S',$00; 003C 42 00 Val : 'B',$00; 003E 20 00 Val : ' ',$00; 0040 3C 00 Val : '<',$00; 0042 2D 00 Val : '-',$00; 0044 3E 00 Val : '>',$00; 0046 20 00 Val : ' ',$00; 0048 53 00 Val : 'S',$00; 004A 65 00 Val : 'e',$00; 004C 72 00 Val : 'r',$00; 004E 69 00 Val : 'i',$00; 0050 61 00 Val : 'a',$00; 0052 6C 00 Val : 'l',$00; LABEL : ProdStringDes_End; LABEL : SerStringDes; 0054 12 Val : SerStringDes_Len; 0055 03 Val : $03; {type string} 0056 32 00 Val : '2',00; 0058 32 00 Val : '2',00; 005A 33 00 Val : '3',00; 005C 34 00 Val : '4',00; 005E 35 00 Val : '5',00; 0060 36 00 Val : '6',00; 0062 37 00 Val : '7',00; 0064 38 00 Val : '8',00; LABEL : SerStringDes_End; 0066 00 00 Val : $00,$00; {reserved for Checksum}]

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