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TTL-232R-RPi

Version 1.0

Document Reference No.: FT_000722 Clearance No.: FTDI# 296

Future Technology

Devices

International Ltd

Datasheet

TTL-232R-RPi Debug

Cable for Raspberry Pi

Datasheet

The TTL-232R-RPi cable provides USB to TTL Level UART solutions and

is customised for operation with the Raspberry Pi.

1 Introduction

TTL-232R-RPi is a USB to TTL level serial UART converter cables incorporating FTDI’s FT232RQ USB to

Serial UART interface IC device which handles all the USB signalling and protocols. The TTL-232R-RPi is

designed for use with the Raspberry Pi (RPi), an ultra-low cost, Linux based miniaturised computer. The

debug cable sits on the Rx/Tx of the RPi ARM processor UART – which provides much more detail of

what’s happening within the RPi operating system. Connecting the debug cable to a PC and

communicating with the RPi via a terminal emulator on a PC gives the user access to more detailed

information from the Linux kernel during RPi start-up, which appears on the Rx/TX lines of the UART, as

well as being able to login and access the kernel itself from the PC.

1.1 Features

 TTL-232R-RPi Debug cable provides a USB to

TTL Serial interface for Raspberry Pi computer.

 On board FT232RQ provides single chip USB to

asynchronous serial data transfer interface.

 Entire USB protocol handled by the electronics

in the cable USB.

 Connect directly to a microcontroller UART or

I/O pins.

 UART interface support for 7 or 8 data bits, 1 or

2 stop bits and odd / even / mark / space / no

parity.

 Fully assisted or X-On / X-Off software

handshaking.

 Data transfer rates from 300 baud to 3 Mbaud

at TTL levels.

 Internal EEPROM with user writeable area.

 5V safe TTL inputs make the TTL-232R easy to

interface to 5V MCU’s.

 FTDI’s royalty-free VCP allow for communication

as a standard emulated COM port and D2XX

‘direct’ drivers provide DLL application

programming interface.

 Support for FT232R FTDIChip-ID™ feature for

improved security.

 3x ‘flying leads’ outputs provide TXD, RXD and

GND signals.

 Low USB bandwidth consumption.

 UHCI / OHCI / EHCI host controller compatible.

 USB 2.0 Full Speed compatible.

 -40°C to +85°C operating temperature range.

 Cable length is 1.0m.

 FCC and CE compliant.

Summary of content (12 pages)

PAGE 1
TTL-232R-RPi Version 1.0 Document Reference No.: FT_000722 Clearance No.: FTDI# 296 Future Technology Devices International Ltd Datasheet TTL-232R-RPi Debug Cable for Raspberry Pi Datasheet The TTL-232R-RPi cable provides USB to TTL Level UART solutions and is customised for operation with the Raspberry Pi. 1 Introduction TTL-232R-RPi is a USB to TTL level serial UART converter cables incorporating FTDI’s FT232RQ USB to Serial UART interface IC device which handles all the USB signalling and protocols.
PAGE 2
TTL-232R-RPi Version 1.0 Document Reference No.: FT_000722 Clearance No.: FTDI# 296 1.2 Ordering Information Part Number Description TTL-232R-RPi USB to UART, 3.
PAGE 3
TTL-232R-RPi Version 1.0 Document Reference No.: FT_000722 Clearance No.: FTDI# 296 Table of Contents 1 2 Introduction ................................................................................... 1 1.1 Features ........................................................................................................ 1 1.2 Ordering Information .................................................................................... 2 Driver Support ....................................................
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TTL-232R-RPi Version 1.0 Document Reference No.: FT_000722 2 Clearance No.: FTDI# 296 Driver Support Royalty-Free VIRTUAL COM PORT (VCP) DRIVERS for: Royalty-Free D2XX Direct Drivers (USB Drivers + DLL S/W Interface):  Windows 7 32,64-bit  Windows 7 32,64-bit  Windows Vista  Windows Vista  Windows XP 32,64-bit  Windows XP 32,64-bit  Windows XP Embedded  Windows XP Embedded  Windows CE.NET 4.2 , 5.0 and 6.0  Windows CE.NET 4.2, 5.0 and 6.
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TTL-232R-RPi Version 1.0 Document Reference No.: FT_000722 Clearance No.: FTDI# 296 Operational Descriptions 3 TTL-232R-RPi is a USB-to-TTL Serial UART debug cable. It is designed to be used with the Raspberry Pi (RPi) Linux-based computer. This cable provides a fast, simple way for a PC to interface with an RPi, to carry out program analysis and debugging. This cable is electrically configured to process and drive +3.3 V logic level UART signals. The USB side of the cable is USB powered and USB 2.
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TTL-232R-RPi Version 1.0 Document Reference No.: FT_000722 Clearance No.: FTDI# 296 4.2 TTL-232R-RPi Debug cable Signal Descriptions Header Pin Name Type Colour Description GND GND Black Device ground supply pin. Connect to ground pin on RPi Number 1 board 2 TXD Output Orange Transmit Asynchronous Data output. Connect to RXD input on RPi board 3 RXD Input Yellow Receive Asynchronous Data input.
PAGE 7
TTL-232R-RPi Version 1.0 Document Reference No.: FT_000722 5 Clearance No.: FTDI# 296 TTL-232R-RPi Debug cable connection diagram The TTL-232R-RPi Debug cable should be connected to Raspberry Pi board according to the diagram below. Please note that TXD-orange wire should be connected to RX pin on RPi board and RXD-yellow wire should be connected to TX pin on RPi board. bottom left top left 3x single pole 0.1in pitch header 1 GND 0V (GND) BLACK TX CABLE 1.
PAGE 8
TTL-232R-RPi Version 1.0 Document Reference No.: FT_000722 7 Clearance No.: FTDI# 296 TTL-232R-RPi Circuit Schematic The circuit schematic for the small internal electronic circuit board, utilising the FTDI FT232R, which is encapsulated into the USB connector end of the cable, is shown in Figure 7-1. Customised versions of these cables are also available. Users interested in customised versions of these cables should contact FTDI sales (sales1@ftdichip.com). CN-USB CN1 5 1 2 3 4 C3 47pF GND C5 4.
PAGE 9
TTL-232R-RPi Version 1.0 Document Reference No.: FT_000722 8 Clearance No.: FTDI# 296 Internal EEROM Configuration The TTL-232R-RPi Debug cable is controlled by the FTDI FT232R IC. This FT232R device contains an EEPROM which contains the USB configuration descriptors for that device. When the cable is plugged into a PC or a USB reset is performed, the PC will read these descriptors. The default values stored into the internal EEPROM are defined in Table 8.
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TTL-232R-RPi Version 1.0 Document Reference No.: FT_000722 9 Clearance No.
PAGE 11
TTL-232R-RPi Version 1.0 Document Reference No.: FT_000722 Clearance No.: FTDI# 296 Appendix A – List of Tables and Figures List of Figures Figure 2-1 – Using the TTL-232R-RPi Generic Cable ................................................................................... 4 Figure 4-1 – TTL-232R-RPi Debug cable Pin Out ......................................................................................... 5 Figure 4-2 – TTL-232R-RPi Debug cable, Single Pole Header Mechanical Details ..................
PAGE 12
TTL-232R-RPi Version 1.0 Document Reference No.: FT_000722 Clearance No.: FTDI# 296 Appendix B – Revision History Document Title: DS_TTL-232R-RPi Document Reference No.: FT_000722 Clearance No.: FTDI# 296 Product Page: http://www.ftdichip.com/Products/Cables/USBTTLSerial.htm Document Feedback: Send Feedback Version 1.