DS_FT312D USB ANDROID HOST IC Datasheet
Version 1.1
Document No.: FT_000816 Clearance No.: FTDI#
331
Future Technology Devices
International Ltd
.
DS_FT312D
(USB Android Host IC)
The FT312D is a USB 2.0 Full Speed
host IC specifically targeted at
providing
access
to
peripheral
hardware from an Android platform
with a USB device port. The device will
bridge the USB port to a UART
interface via the Android Open
Accessory protocol and has the
following advanced features:
Single chip USB to UART interface.
Entire USB protocol handled on the chip. No
USB specific firmware programming required.
Supports USB bulk transfer mode
Basic UART interface with RXD, TXD, RTS#,
CTS# pins.
TX_ACTIVE signal for controlling transceivers
on RS485 interfaces.
UART RX buffer size is 5512 bytes
UART TX buffer size is 256 bytes
USB_ERROR indicator pin
Suitable for use on any Android platform
supporting Android Open Accessory Mode
(Typically
3.1
onwards,
however
some
platforms may port Open Accessory Mode to
version 2.3.4)
12MHz oscillator using external crystal.
Integrated power-on-reset circuit.
+3V3Single Supply Operation with 5V tolerant
inputs.
USB 2.0 Full Speed compatible.
Extended operating temperature range; -40⁰C
to 85⁰C.
Available in compact Pb-free 32 Pin LQFP and
QFN packages (both 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
Copyright © 2013 Future Technology Devices International Limited
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DS_FT312D USB ANDROID HOST IC Datasheet
Version 1.1
Document No.: FT_000816 Clearance No.: FTDI#
331
1
Typical Applications
Connecting Android phones to USB accessories
Connecting Android tablets to USB accessories
Controlling instrumentation from Android
devices.
Home automation via Android devices
Data logging from USB accessories
Connecting serial printing devices to Android
devices
1.1 Part Numbers
Part Number
Package
FT312D-32Q1C-x
FT312D-32L1C-x
Note: Packing codes for x is:
32 Pin QFN
32 Pin LQFP
- R: Taped and Reel, QFN 3,000pcs per reel, LQFP 1500 pcs per reel.
- (no suffix): Tray packing, 260pcs per tray QFN, 250 pcs per tray LQFP
For example: FT312D-32Q1C-R is 3,000pcs QFN taped and reel packing
1.2 USB Compliant
At the time of writing this datasheet, the FT312Dhad not completed the USB Compliancy Test.
Copyright © 2013 Future Technology Devices International Limited
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DS_FT312D USB ANDROID HOST IC Datasheet
Version 1.1
Document No.: FT_000816 Clearance No.: FTDI#
331
2
FT312D Block Diagram
USB_ERROR#
TXD
USBDP
USBDM
USB
Transceiver
USB Host
Buffer
UART
RXD
RTS#
CTS#
TX_ACTIVE
Figure 2.1FT312D Block Diagram
For a description of the function please refer to
Section 4.
Copyright © 2013 Future Technology Devices International Limited
3
DS_FT312D USB ANDROID HOST IC Datasheet
Version 1.1
Document No.: FT_000816 Clearance No.: FTDI#
331
Table of Contents
1
1.1
1.2
Typical Applications ...................................................................... 2
Part Numbers ..................................................................................... 2
USB Compliant .................................................................................... 2
2
3
3.1
FT312D Block Diagram ................................................................. 3
Device Pin Out and Signal Description .......................................... 6
Package Symbol.................................................................................. 6
Package PinOut Description ........................................................................................... 6
3.1.1
4
4.1
4.2
Function Description..................................................................... 8
Key Features ....................................................................................... 8
Functional Block Descriptions ............................................................. 8
UART Interface Module ................................................................................................. 8
Buffers ....................................................................................................................... 8
USB Host .................................................................................................................... 8
USB Transceivers ......................................................................................................... 8
4.2.1
4.2.2
4.2.3
4.2.4
4.3
Default Descriptor Strings .................................................................. 8
5
6
7
7.1
7.2
UART Interface ........................................................................... 10
USB Error Detection.................................................................... 12
Absolute Maximum Ratings ........................................................ 13
DC Characteristics .............................................................................14
ESD and Latch-up Specifications ........................................................15
8
8.1
8.2
Application Examples ................................................................. 16
USB to UARTConverter .......................................................................16
USB to RS232 Converter ....................................................................17
9
9.1
Package Parameters ................................................................... 18
FT312D Package Markings .................................................................18
QFN-32 .................................................................................................................... 18
LQFP-32 ................................................................................................................... 19
9.1.1
9.1.2
9.2
9.2.1
9.2.2
FT312DPackage Dimensions ..............................................................20
QFN-32 Package Dimensions ....................................................................................... 20
LQFP-32 Package Dimensions ...................................................................................... 21
9.3
Solder Reflow Profile .........................................................................22
10
Contact Information ................................................................... 24
Appendix A – References ............................................................................25
Appendix B - List of Figures and Tables ......................................................26
Appendix C - Revision History.....................................................................27
Copyright © 2013 Future Technology Devices International Limited
4
DS_FT312D USB ANDROID HOST IC Datasheet
Version 1.1
Document No.: FT_000816 Clearance No.: FTDI#
331
Copyright © 2013 Future Technology Devices International Limited
5
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