Copyright © 2014 Future Technology Devices International Limited

1

Document No.: FT_000648

FT121 ENHANCED USB DEVICE CONTROLLER WITH SPI SLAVE IC

Datasheet Version 1.2

Clearance No.: FTDI#

312

Future Technology Devices

FT121

(Enhanced USB Device

Controller with SPI Slave IC)

The FT121 is a USB generic interface

controller with the following advanced

features:



USB 2.0 Full Speed compatible



High performance USB device controller with

integrated SIE, endpoint buffer, transceiver

and voltage regulators



Fully integrated clock generation with no

external crystal required



Supports Serial Parallel interface (SPI) slave to

external microcontroller



Supports up to 8 bi-directional endpoints with

total 2k bytes endpoint buffer



Max packet size is 504 bytes for isochronous

endpoint

and

64

bytes

for

control/bulk/interrupt endpoint



Double

buffer

scheme

for

any

endpoint

increases data transfer throughput



Multiple interrupt modes to facilitate both bulk

and isochronous transfers



USB

Battery

Charger

detection

allowing

optimized charging profile



Integrated

DP

pull-up

resistor

for

USB

connection



Supports

bus-powered

or

self-powered

applications



VCC power supply operation at 3.3V or 5V



Internal 1.8V and 3.3V LDO regulators



VCC IO level range from 1.8V to 3.3V



Integrated power-on-reset circuit



UHCI/OHCI/EHCI host controller compatible



-40°C to 85°C extended operating temperature

range



Available in Pb-free TSSOP-16 and QFN-16

packages (RoHS compliant)

Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or reproduced

in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are

supplied on an as-is basis and no warranty as to their suitability for any particular purpose is either made or implied. Future Technology

Devices International Ltd will not accept any claim for damages howsoever arising as a result of use or failure of this product. Your

statutory rights are not affected. This product or any variant of it is not intended for use in any medical appliance, device or system in

which the failure of the product might reasonably be expected to result in personal injury. This document provides preliminary

information that may be subject to change without notice. No freedom to use patents or other intellectual property rights is implied by

the publication of this document. Future Technology Devices International Ltd, Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow

G41 1HH United Kingdom. Scotland Registered Company Number: SC136640