TTL-232R-RPI Datasheet TTL-232R-RPI | P4-P6

4

TTL-232R-RPi

Version 1.0

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

2 Driver Support

Royalty-Free VIRTUAL COM PORT (VCP)

DRIVERS for:

 Windows 7 32,64-bit

 Windows Vista

 Windows XP 32,64-bit

 Windows XP Embedded

 Windows CE.NET 4.2 , 5.0 and 6.0

 MAC OS OS-X

 Linux 2.6.32 or later

 ARM Linux

 Android

Royalty-Free D2XX Direct Drivers (USB Drivers +

DLL S/W Interface):

 Windows 7 32,64-bit

 Windows Vista

 Windows XP 32,64-bit

 Windows XP Embedded

 Windows CE.NET 4.2, 5.0 and 6.0

 MAC OS OS-X

 Linux 2.6.32 or later

 ARM Linux

 Android

The drivers listed above are all available to download for free from www.ftdichip.com. Various 3rd Party

Drivers are also available for various other operating systems - visit www.ftdichip.com for details.

For driver installation instructions please see:

http://www.ftdichip.com/Support/Documents/InstallGuides.htm.

2.1 Driver Operation Examples

The TTL-232R-RPi debug cables require USB drivers, available free from http://www.ftdichip.com, which

are used to make the FT232R in the cable appear as a virtual COM port (VCP). This then allows the user

to communicate with the USB interface via a standard PC serial emulation port (for example TTY).

Another FTDI USB driver, the D2XX driver, can also be used with application software to directly access

the FT232R on the cable though a DLL. This is illustrated in the Figure 2-1.

VCP

TTY

USB

TTL-232R-Rpi

Debug Cable

Virtual COM Port

Software application access to USB via D2XX

USB

TTY

D2XX

DLL

3x 0.1" Single Pole Connectors

Figure 2-1 – Using the TTL-232R-RPi Generic Cable

5

TTL-232R-RPi

Version 1.0

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

3 Operational Descriptions

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 2.0 Full Speed compatible, supporting data transfer rates up to 3

Mbaud. Spanning 1.0m in length, the TTL-232R-RPi debug cable connects directly to the serial port on

the RPi board. The RPi’s serial port can output kernel debug messages even if it has not been completely

booted.

The following serial communication parameters should be used to access the serial/debugger port on

Raspberry Pi board:

* Speed: 115200 baud

* Bits: 8

* Parity: None

* Stop Bits: 1

* Flow Control: None

For more information about the Raspberry Pi Computer refer to the Raspberry Pi Foundation web site:

http://www.raspberrypi.org/

4 Functional Descriptions

4.1 TTL-232R-RPi Wire Configuration

The following Figure 4-1 shows the cable signals and the wire colours for these signals on the TTL-232R-

RPi generic cables.

4

CABLE 1.0m

1

2

3

3x single pole

0.1in pitch header

BLACK

ORANGE

YELLOW

Figure 4-1 – TTL-232R-RPi Debug cable Pin Out

2.54mm

+/-0.05

2.60mm

+/-0.05

14.0mm

+/-0.2

Figure 4-2 – TTL-232R-RPi Debug cable, Single Pole Header Mechanical Details

6

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

Number

Name

Type

Colour

Description

1

GND

Black

Device ground supply pin. Connect to ground pin on RPi

board

2

TXD

Output

Orange

Transmit Asynchronous Data output. Connect to RXD input

on RPi board

3

RXD

Input

Yellow

Receive Asynchronous Data input. Connect to TXD output

on RPi board

Table 4-1 – TTL-232R-RPi Debug cable Signal Descriptions

4.3 TTL-232R-RPi Debug cable Electrical Parameters

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

VCC

Power Input Voltage

4.25

5.0

5.25

V

Dependant on the USB

port that the TTL-232R-

RPi Debug cable is

connected to

I

O

Power Input Current

-

15

mA

Less than 70uA during

suspend.

T

Operating Temperature

Range

-40

-

+85

o

C

Table 4-2 – TTL-232R-RPi Debug cable Operating Parameters

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

Voh

Output Voltage High

2.2

2.8

3.2

V

I source = 3mA

Vol

Output Voltage Low

0.3

0.4

0.6

V

I sink = 8mA

Vin

Input Switching Threshold

1.0

1.2

1.5

V

Vhys

Input Switching Hysteresis

20

25

30

mV

Table 4-3 – TTL-232R- RPi Debug cable I/O Pin Characteristics

TTL-232R-RPI

TTL-232R-RPI

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