UM232H FTDI, Future Technology Devices International Ltd, UM232H Datasheet - Page 15

• Manufacturer Part Number: UM232H
• Description: MOD EVAL USB - SERIAL - FT232H
• Manufacturer: FTDI, Future Technology Devices International Ltd

Specifications of UM232H

• Main Purpose: Interface, USB 2.0 to Serial FIFO Bridge
• Embedded: No
• Utilized Ic / Part: FT232H
• Primary Attributes: High Speed (480Mbps) Transceiver
• Secondary Attributes: LED Status Indicators
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 768-1103

7
The UM232H Module can be configured as USB Bus-Powered or USB Self-Powered. This section describes
how to configure the UM232H for a number of different power supply arrangements.
7.1 BUS Powered Configuration
Figure 7.1 : Bus Powered Configuration
Figure 7.1 illustrates the UM232H in a typical USB bus powered design configuration, which consists of two
connections, a J1-2 to J1-3 connection and a J2-2 to J2-3 connection.
Connecting J1-2 (5V0) to J1-3 (USB) takes the power from the VBUS pin (J1-3) and supplies it to the on
chip voltage regulator input of the FT232H via pin 5V0 (J1-2).
Connecting J2-2 (VIO) (power input for core of the FT232H) and J2-3 (3V3) (power output from the
FT232H) powers the VCCIO, VPLL and VPHY pins of the FT232H chip.
A USB Bus Powered device gets its power from the USB bus. Basic rules for USB Bus power devices are as
follows –
i) On plug-in to USB, the device must draw no more than 100mA.
ii) On USB Suspend the device must draw no more than 500μA.
iii) A Bus Powered High Power USB Device (one that draws more than 100mA) should use PWREN# to keep
the current below 100mA on plug-in and 500μA on USB suspend.
iv) A device that consumes more than 100mA cannot be plugged into a USB Bus Powered Hub.
v) No device can draw more that 500mA from the USB Bus.
Interfacing the UM232H module to a microcontroller (MCU), or other logic for a bus powered design would
be done in exactly the same way as for Self-Powered designs (see Section 7.3), except that the MCU or
external logic would take its power supply from the USB bus (either the 5V on the USB pin, or 3.3V on the
3V3 pin).
Bus powered configuration, where the +5V supply that powers the module is sourced from the USB bus,
Module Configurations
5V or 3V3
and the 3V3 regulator output powers the core of the FT232H.
MCU
© Copyright 2011 Future Technology Devices International Ltd
RTS#
RXD
TXD
CTS#
UM232H Single Channel USB Hi-Speed FT232H Development Module
14
CTS#
TXD
RXD
RTS#
J2-14
J2-1
Document Reference No.: FT_000367
3V3
VIO
Clearance No.: FTDI# 198
USB
5V0
Datasheet Version 1.2
J1-14
J1-1