FT260Q-R datasheet(41/61 Pages) FTDI

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FT260 HID-CLASS USB TO UART/I2C BRIDGE IC

Version 1.1

Document No.: FT_001272 Clearance No.: FTDI#484

8.2

USB to RS232 Converter

Figure 8.2 Application Example 2: USB to RS232 Converter

An example of using the FT260 as a USB to RS232 converter is illustrated in Figure 8.2. In this

application, a TTL to RS232 Level Converter IC is used on the serial UART interface of the FT260 to

convert the TTL levels of the FT260 to RS232 levels. This level shift can be done using the popular “213”

series of TTL to RS232 level converters. These “213” devices typically have 4 transmitters and 5 receivers

in a 28-LD SSOP package and feature an in-built voltage level converter to convert the +5V (nominal)

VCC to the +/- 9 volts required by RS232.

The Shut Down control (SHDN) signal of the converter device is the suspend control. The pin DIO7 of the

FT260 can be set to function as SUSPOUT_N with active-low output and can be the control source to the

converter IC. Note that the power source for the converter IC in Figure 8.2 is not supplied from the

VOUT3V3 of the FT260 since the current consumption of this kind of converter is high. The supply current

of VOUT3V3 is limited. Details can be referred to Table 6.1.

FT260Q-R データシート(PDF) 41 Page - Future Technology Devices International Ltd.