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UMFT231XE Datasheet(PDF) 11 Page - Future Technology Devices International Ltd. |
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UMFT231XE Datasheet(HTML) 11 Page - Future Technology Devices International Ltd. |
11 / 18 page 11 Copyright © 2012 Future Technology Devices International Limited UMFT231XE Version 1.0 Document Reference No.: FT_000652 Clearance No.: FTDI# 294 5.5 Variable IO Voltage Supply MCU Vcc = 1.8V – 3.3V TXD RXD RTS# CTS# GND TXD RXD RTS# CTS# Jumper JP2 - Closed Jumper JP1 - Open GND VCCIO 3V3OUT VBUS VCC Figure 5.4 – USB Bus Powered 3.3V Logic Drive The FT231X can process signals at CMOS/TTL logic levels in the range of 1.8V to 3.3V. This section describes how to utilise this feature. Figure 5.4 shows a configuration where the FT231X is interfaced to a device with IOs operating in the range of 1.8V - 3.3V. The IO ports of this module need to be powered with a voltage level that is equal to the level of the signals it is processing. Since the FT231X‟s embedded voltage regulator only outputs 3V3 the IO ports will need to be powered from another power source when operating at voltage levels other than 3.3V. By default, a short is present between 3V3OUT (embedded voltage regulator) and VCCIO (IO port‟s power input with the connection made by JP1. If an external power supply is used to power the IO ports this jumper needs to be open. The configuration described in this section can be implemented in either bus-powered mode or self- powered mode. Note 1: The CBUS and DBUS pins are 5V tolerant; however these signals cannot drive signals at 5V TTL/CMOS. VCCIO is not 5V tolerant; applying 5V to VCCIO will damage the chip. Note 2: If power is applied to VCCIO and no power is applied to VCC all IOs will be at an unknown state, this however will not damage the chip. The FT231X also has protective circuitry to prevent the chip being damaged by a voltage discrepancy between VCCIO and the level of the signal being processed. Note 3: When using VCCIO less than 3V3 on a chip from FTDI‟s X-chip range, it is recommended to use pull up resistors (47K) to VCCIO on the data lines, all of the UMFT2xxXE devices include an on-board pull-up for these lines. |
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