FT260 HID-CLASS USB TO UART/I2C BRIDGE IC
Version 1.1
Document No.: FT_001272
Clearance No.: FTDI#484
Future Technology Devices
International Ltd.
FT260
(HID-class USB to UART/I2C
Bridge IC)
FT260 is a HID-class USB to I2C/UART interface
Device Controller with the following advanced
features:
Single chip USB to UART/I2C bridge with
standard Human Interface Device (HID) class
support
USB2.0 compliant Full Speed device with entire
USB protocol handled on the chip.
Support
2
USB
HID
corresponding
to
the
interfaces, I2C and UART
Interfaces,
each
on-chip
physical
Pin configuration of enabling HID interface for
variety of application
HID over I2C specification support
Configurable I2C Master Interface controller
conforming to I2C v2.1 and v3.0 specification.
Support 4 speed modes defined in I2C-bus
Specification, standard mode (SM), fast mode
(FM), Fast mode plus (FM+), and High Speed
mode (HS)
Robust FTDI UART controller with hardware and
software flow control
Data transfer rate from 1.2 Kbuad to 12 Mbaud
(RS422, RS485, RS232) at TTL levels
Configurable GPIOs can be easily controlled by
software applications under HID class via the
USB bus
Fully integrated oscillator PLL with no external
crystal required
On-chip eFUSE for USB Vendor ID (VID),
Product ID (PID), and other vendor specific
parameters.
Unique USB serial number generation engine
and programming path to external EEPROM.
Integrated 5V-3.3V-1.8V level converter for
USB I/O.
+5V USB VBUS detection engine
USB Power Configurations; supports buspowered, self-powered and bus-powered with
power switching.
USB2.0 Low operating and suspend current;
24mA (active-typ) and 385µA (suspend-typ).
True 3.3V CMOS drive output and TTL input.
(operates down to 1V8 with external pull-ups)
Multiple I/O operating voltage level +3.3V,
+2.5V, +1.8V
pin output drive strength; 4 mA(min) and 16
mA(max)
Integrated power-on-reset circuit.
USB Battery Charger Detection.
UHCI / OHCI / EHCI / XHCI host controller
compatible.
Extended operating temperature range; -40 to
85⁰C.
Available in compact Pb-free 28 Pin WQFN or
TSSOP 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
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FT260 HID-CLASS USB TO UART/I2C BRIDGE IC
Version 1.1
Document No.: FT_001272
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Clearance No.: FTDI#484
Typical Applications
HID class Device controller
USB to RS232/RS422/RS485 Converters
USB to HID-over-I2C Bridge
USB to I2C master controller
Interfacing MCU/PLD/FPGA based designs to
USB
USB Instrumentation
1.1 Driver Support
The USB Human Interface Device (HID) class is natively supported by most operation systems. A custom
driver is not required to be installed for the FT260.
Windows 10 32, 64-bit
Windows 8.1 32, 64-bit
Windows 8 32, 64-bit
Windows 7 32, 64-bit
Windows Vista and Vista 64-bit
Windows XP and XP 64-bit
Windows CE 4.2, 5.0, 5.2, 6.0
Windows Server 2008, 2003, 2000
Windows Embedded Operating Systems
Mac OS X
Linux
Android
1.2 Part Numbers
Part Number
Package
FT260Q-x
28 Pin WQFN
FT260S-x
28 Pin TSSOP
Note: Packing codes for x is:
- R: Taped and Reel, 2,500pcs per reel
- T: Tray packing, 490pcs per tray (WQFN only)
- U: Tube packing, 50pcs per tube (TSSOP only)
For example: FT260Q-R is 2,500pcs taped and reel packing
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FT260 HID-CLASS USB TO UART/I2C BRIDGE IC
Version 1.1
Document No.: FT_001272
Clearance No.: FTDI#484
1.3 USB Compliant
The FT260 is fully compliant with the USB 2.0 specification and has been given the USB-IF Test-ID (TID)
40001720.
.
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Version 1.1
Document No.: FT_001272
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FT260 Block Diagram
Figure 2.1 FT260 Block Diagram
For a description of each function please refer to Function Description.
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Version 1.1
Document No.: FT_001272
Clearance No.: FTDI#484
Table of Contents
1
Typical Applications ...................................................... 2
1.1
Driver Support .......................................................................... 2
1.2
Part Numbers ............................................................................ 2
1.3
USB Compliant .......................................................................... 3
2
FT260 Block Diagram .................................................... 4
3
Device Pin Out and Signal Description .......................... 7
3.1
WQFN-28 Package Pin Out ........................................................ 7
3.2
TSSOP-28 Package Pin Out ....................................................... 8
3.3
Pin Description.......................................................................... 9
4
Function Description ................................................... 12
4.1
Key Features ........................................................................... 12
4.2
Functional Block Descriptions ................................................. 13
5
FT260 Configuration and Bus Interfaces ..................... 17
5.1
Device Interface Configuration ............................................... 17
5.2
I2C Bus Interface .................................................................... 18
5.2.1
I2C Pin Definition ........................................................................................ 18
5.2.2
I2C Bus Protocol .......................................................................................... 18
5.2.3
I2C Slave Address ....................................................................................... 20
5.2.4
I2C Timing ................................................................................................. 20
5.3
UART Interface ....................................................................... 22
5.3.1
UART Pin Definition ..................................................................................... 24
5.3.2
UART Bus Protocol ...................................................................................... 24
5.3.3
UART Flow Control ...................................................................................... 26
5.3.4
UART Timing .............................................................................................. 26
5.4
6
GPIOs ..................................................................................... 27
Devices Characteristics and Ratings ........................... 28
6.1
Absolute Maximum Ratings ..................................................... 28
6.2
ESD and Latch-up Specifications ............................................. 28
6.3
DC Characteristics ................................................................... 29
6.4
USB Characteristics ................................................................. 33
7
FT260 Power Configurations ....................................... 34
7.1
USB Bus Powered Configuration ............................................ 34
7.2
Self Powered Configuration with 5V Source Input .................. 35
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FT260 HID-CLASS USB TO UART/I2C BRIDGE IC
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Clearance No.: FTDI#484
7.3
Self Powered Configuration with 3.3V Source In .................... 36
7.4
Bus Powered Configuration with +1.8V/+2.5V I/O Voltage ... 37
7.5
Configuration for System Pins ................................................. 38
7.6
Power for Programming eFUSE ............................................... 39
8
Application Examples .................................................. 40
8.1
USB HID-over-I2C ................................................................... 40
8.2
USB to RS232 Converter ......................................................... 41
8.3
USB to RS485 Converter ......................................................... 42
8.4
USB to RS422 Converter ......................................................... 43
9
User Configuration ...................................................... 44
9.1
Programming the embedded eFUSE over USB ......................... 44
9.1.1
9.2
Default Values ............................................................................................ 44
Programming the external EEPROM over USB ......................... 47
9.2.1
Supported EEPROM Spec ............................................................................. 47
9.2.2
Default Values ............................................................................................ 48
10
Package Parameters ................................................... 51
10.1
WQFN-28 Package Mechanical Dimensions .......................... 51
10.2
WQFN-28 Package Markings ................................................ 52
10.3
TSSOP-28 Package Mechanical Dimensions .......................... 53
10.4
TSSOP-28 Package Markings ................................................ 54
10.5
Solder Reflow Profile ............................................................ 55
11
Contact Information ................................................... 56
Appendix A – References ................................................... 57
Document References ...................................................................... 57
Acronyms and Abbreviations............................................................ 58
Appendix B - List of Figures and Tables ............................. 59
List of Figures .................................................................................. 59
List of Tables.................................................................................... 59
Appendix C - Revision History ............................................ 61
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Device Pin Out and Signal Description
3.1 WQFN-28 Package Pin Out
Figure 3.1 Pin Configuration WQFN-28 (top-down view)
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Version 1.1
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3.2 TSSOP-28 Package Pin Out
Figure 3.2 Pin Configuration TSSOP-28 (top-down view)
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3.3 Pin Description
Pin Name
FT260Q
Pin No.
FT260S
Pin No.
(Function)
1
5
DEBUGGER
I/O
2
6
STEST_RSTN
I
3
7
RESETN
I
4
8
DCNF0
I
Device Interface Configuration Selection bit-0 for the HID interface
selection. Refer to Section 5.1
5
9
DCNF1
I
Device Interface Configuration Selection bit-1 for the HID interface
selection. Refer to Section 5.1
Type
Description
Debugging pin.
Should be reserved and tied to high
Chip reset input for test mode. Active low.
Should be reserved and tied to high.
Chip reset input. Active low.
Can be tied to high if external reset function is not required.
+3.3V/2.5V/1.8V supply voltage.
6
10
VCCIO
P **
This is the supply voltage for all the I/O ports. This pin shall be
connected to VOUT3V3(pin 22/26) when I/O ports are working at
3.3V
DIO0, Digital Input/Output Pin 0.
7
11
DIO0
I/O
( TX_ACTIVE /
O
TX_LED /
O
GPIOA
)
I/O
This pin can be configured as one of the following three functions via
embedded eFUSE or external EEPROM.
TX_ACTIVE is set as the default function to indicate the UART
transmitting is active.TX_LED is set as the LED driving source when data is transmitted on
UART TX port.
GPIOA, General Purpose I/O. GPIOA is another optional function.
8
9
10
11
12
12
13
14
15
16
DIO1
I/O
( GPIOB /
I/O
RTSN
O
)
DIO2
I/O
( GPIOE /
I/O
CTSN
I
)
DIO3
I/O
( RXD /
I
DIO1, Digital Input/Output Pin 1.
GPIOB, General Purpose I/O. is set as the default function.
RTSN, Request To Send Handshake, can be enabled via a USB
command for the UART interface.
DIO2, Digital Input/Output Pin 2.
GPIOE, General Purpose I/O. is set as the default function.
CTSN, Clear To Send Handshake, can be enabled via a USB command
for the UART interface.
DIO3, Digital Input/Output Pin 3.
RXD, Receive Asynchronous Data Input, is set as default function
when the UART interface is selected via {DCNF1, DCNF0}.
GPIOC )
I/O
GPIOC, General Purpose I/O, is set as the default function when UART
interface is not configured.
DIO4
I/O
( TXD /
O
GPIOD )
I/O
GPIOD, General Purpose I/O, is set as default when the UART
interface is not configured.
DIO5
I/O
DIO5, Digital Input/Output Pin 5.
DIO4, Digital Input/Output Pin 4.
TXD, Transmit Asynchronous Data Output, is set as default when the
UART interface is selected via {DCNF1, DCNF0}.
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FT260 HID-CLASS USB TO UART/I2C BRIDGE IC
Version 1.1
Document No.: FT_001272
FT260Q
Pin No.
FT260S
Pin No.
Pin Name
Clearance No.: FTDI#484
Type
Description
( SCL /
I/O
GPIO0 )
I/O
SCL, Serial clock for I2C bus with open drain output, is set as the
default function
(Function)
GPIO0, General Purpose I/O. GPIO0 is another optional function and
can be enabled via a USB command.
DIO6, Digital Input/Output Pin 6.
13
17
DIO6
I/O
( SDA /
I/O
GPIO1 )
I/O
SDA, Serial data for I2C mode with open drain output, is set as the
default function.
GPIO1, General Purpose I/O. GPIO1 is another optional function and
can be enabled via a USB command.
DIO7, Digital Input/Output Pin 7.
This pin can be configured as one of the following three functions via
embedded eFUSE or external EEPROM.
14
18
DIO7
I/O
( SUSPOUT_N /
O
PWREN_N /
O
GPIO2
)
I/O
SUSPOUT_N is set as the default function as the indicator when
entering the USB suspending state. _N means active low. This
indicator can also be configured as active high via EEPROM and
symbolled as SUSPOUT.
PWREN_N is as the power enable indicator when the FT260 is USB
enumerated. Active low.
GPIO2, General Purpose I/O. GPIO2 is another optional function and
can be enabled.
15
16
19
20
DIO8
I/O
( INTRIN /
I
WAKEUP /
I
GPIO3 )
I/O
DIO9
I/O
( GPIOF /
I/O
DTRN )
17
21
O
DIO10
I/O
( GPIO4 /
I/O
DCD
I
)
DIO8, Digital Input/Output Pin 8.
INTRIN is the default function as the external interrupt input source
WAKEUP functions as the USB remote wakeup input source.
GPIO1, General Purpose I/O. GPIO1 is another optional function and
can be enabled via a USB command.
DIO9, Digital Input/Output Pin 9.
GPIOF, General Purpose I/O. is set as the default function.
DTRN, Data Terminal Ready, can be enabled via a USB command for
the UART interface.
DIO10, Digital Input/Output Pin 10.
GPIO4, General Purpose I/O, is set as the default function.
DCD, Data Carrier Detection, can be enabled via a USB command for
the UART interface.
DIO11, Digital Input/Output Pin 11.
18
22
DIO11
I/O
GPIO5, General Purpose I/O, is set as the default function.
( GPIO5/
I/O
I
RI, Ring Indicator, can be enabled via a USB command for the UART
interface. RI may be used as an alternative to WAKEUP for waking up
the USB host. WAKEUP feature accompanied with RI can be enabled
via the parameter defined in an external EEPROM.
Ground
RI
)
19
23
GND
P
20
24
DM
AI/O
USB peripheral bidirectional DM line.
21
25
DP
AI/O
USB peripheral bidirectional DP line.
22
26
VOUT3V3
P **
+3.3V voltage Out
May be used to power VCCIO. When VCCIN is supplied with 3.3V, this
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FT260 HID-CLASS USB TO UART/I2C BRIDGE IC
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Document No.: FT_001272
FT260Q
Pin No.
FT260S
Pin No.
Pin Name
(Function)
Type
Clearance No.: FTDI#484
Description
pin is a power input pin and should be connected to pin 23 / 27.
23
27
VCCIN
P **
24
28
AGND
P
25
1
FSOURCE
AP
26
2
VBUS_DET
I
+5.0V(or 3.3V) supply voltage In
Power source-in to embedded regulator.
Analog Ground
+3.8V supply voltage In
Power source for programming embedded eFUSE. It should be kept
floating or 0V when not in programming mode
VBUS detection input. It is a +5.0V tolerant pin
DIO12, Digital Input/Output Pin 12.
27
3
DIO12
I/O
( BCD_DET/
O
RX_LED/
O
PWREN_N/
O
GPIOG
I/O
)
This pin can be configured as one of the following three functions via
embedded eFUSE or external EEPROM.
BCD_DET is the default function as the battery charger detection
indicator output when the device is connected to a dedicated battery
charger port. Polarity can be defined.
RX_LED is as the LED driving source when data is received on UART
RX port.
PWREN_N is as the power enable indicator when FT260 is USB
enumerated. Low active.
GPIOG, General Purpose I/O, is another optional function.
28
4
DIO13
I/O
GPIOH/
I/O
DSRN
I
DIO13, Digital Input/Output Pin 13.
GPIOH, General Purpose I/O, is set as the default function
DSRN, Data Set Ready, can be enabled via USB command for UART
interface.
Table 3.1 FT260 Pin Description
**If VCCIN is supplied with 3.3V power input, then VOUT3V3 and VCCIO must also be driven with this
3.3V power source. For details refer to Section 7.3.
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FT260 HID-CLASS USB TO UART/I2C BRIDGE IC
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Function Description
The FT260 is a USB device which supports I²C and UART communication through standard USB HID class
interfaces. The USB HID class is natively supported by most operating systems. A custom driver is not
required to be installed for the FT260.
4.1 Key Features
Highly Functional Integration. FT260 is highly integrated, with a USB2.0 compliant full-speed
transceiver, oscillator PLL as the source of the operating clock, LDO regulator for full chip operating
power source, eFUSE for basic customization and automatic scanning mechanism of EEPROM for
advanced customization. It also includes Power-On-Reset (POR) and VBUS detection input with 5Vtolerance. These embedded functions simplify external circuit design and reduce external component
count.
HID class USB to I2C/UART Bridge. FT260 provides the bridge function between standard a USB HID
class driver and an I2C slave device and/or UART device. The standard USB HID class driver is natively
supported by most operating systems meaning the FT260, does not need a customized driver to be
installed. The USB HID class exchanges data between a host and a device by HID reports, which are the
actual data blobs follow HID format, and the application developers have to communicate with the FT260
via the HID reports. Please refer to Application Notes for detail formats. In order to help the developers,
FTDI also provides a Windows DLL with easy-to-use API for FT260 application development.
There are 2 USB interfaces corresponding to HID class in the FT260. One is for the I2C bus and the other
is for the UART bus. These two interfaces can exist concurrently and can be selected independently
according to the application. For each interface, there exists one Interrupt IN pipe and Interrupt OUT pipe
with a max packet size equal to 64 bytes. With the fastest polling frequency, one time in 1 ms, the
Interrupt pipes can operate with maximum data throughput up to 64kB/sec. Users can also utilize the
HID class commands through the Control pipe to configure the setting and to control the functions in the
FT260. Digital function pins can be programmed as GPIO and can be controlled by HID class commands
through Endpoint 0.
The I2C bus can run at common I2C bus speeds, standard mode (SM), fast mode (FM), Fast mode plus
(FM+), and High Speed mode (HS). A higher bit rate on the I2C bus is also configurable up to 3Mbit/s.
Clock stretching is supported to conform to v2.1 and v3.0 of the I2C specification. The default
configuration is for standard mode speed (SM). All the configurable settings can be changed over USB
before the I2C bus starts any transferring.
The robust FTDI UART bus is embedded in the FT260. The baud rate can be supported from 1200 baud to
12M baud. RTSN/CTSN, DSRN/DTRN and XON/XOFF handshaking options are also supported and can be
enabled by associated APIs defined in the DLL for the FT260. Data can be received from the RX pin and
delivered to the HID driver via the Interrupt IN pipe. Data can also be delivered from the USB host
through the Interrupt OUT pipe and transmitted on to the TX pin.
An remote wake up function is also supported. If the operating system supports remote wake up and
allows external hardware to wake it, the FT260 can be resumed by the pin DIO8 which is set by default
as WAKEUP triggering a resume signal on USB bus to wake up USB host. DIO11 can also be a remote
wake up source when the pin function is set as RI and the parameter, RI as Wake-Up; defined in external
EEPROM is enabled.
HID over I2C Bridge Human Interface Device (HID) is one of the most popular USB devices. It was a
protocol developed to simplify the process of connecting accessories such as mouse, keyboard and
touchpad to the PC. HID was originally developed to run over USB or Bluetooth. For Windows 8, Microsoft
created a new device type called “HID over I2C”, which allows the device to communicate HID protocol
over an Inter-Integrated Circuit (I²C) bus. The new “HID over I2C” devices are only supported natively by
Microsoft Windows 8 or above.
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The FT260 provides a bridge which connects a “HID-over-I²C” device via an I²C bus, helps to translate
USB HID requests from a PC to the device, and makes it work as a normal USB HID class device. With
the FT260, an I2C slave function compliant to HID-over-I2C protocol can directly communicate to USB
HID class driver through the USB connection.
Configurable Settings for Customization. An electrical poly-fuse (eFUSE) is embedded in the FT260.
This embedded eFUSE provides the configurable settings of the Vendor Specific Parameters for basic
customization. These Vendor Specific Parameters are the settings about USB, I/O and HID-over-I2C.
Users can utilize this embedded eFUSE to achieve basic customization.
For advanced settings, the FT260 also reserves the programming interface of an external EEPROM via an
I2C interface to record the Vendor Specific Parameters. The FT260 will automatically scan for the
presence of an EEPROM. (See Supported EEPROM Spec for suitable devices). When the FT260 is powered
up, these Vendor Specific Parameters will be automatically loaded and the FT260 will operate with the
parameter setting. When both eFUSE and EEPROM exist at the same time, the Vendor Specific
Parameters in the EEPROM will dominate. Both eFUSE and EEPROM can be programmed using the FTDI
utility software called FT_PROG, which can be downloaded from the FTDI Utilities page on the FTDI
website
(http://www.ftdichip.com/Support/Utilities.htm#FT_Prog).
Configurable Digital I/Os. There are 14 digital pins in the FT260 that can be configured for different
purposes, such as UART/I2C bus signals, General Purpose Input/Output (GPIO), LED indicator for data
transfer over UART, a USB suspend indicator output, remote wake up input, an interrupt input or power
enable indicator. Functions for each pin will be determined during Chip Configuration, with parameters
from the eFUSE or EEPROM, or via USB commands.
The signal drive strength of these Digital I/Os can be configured via the FT_Prog utility for different
design needs.
Power management. The operating clock for the FT260 can be set as 48MHz, 24MHz, 12MHz. Higher
operating frequencies allow higher data throughput. And, lower operating frequencies allow lower power
consumption. IDLE mode is also supported and can be enabled via the parameters in eFUSE or EEPROM.
The system operating clock will be switched to 30 kHz when no data is transferred between USB and
I2C/UART bus for a period of 5 seconds. Any UART RX signalling will trigger the whole chip exiting from
the IDLE mode to normal operating status.
USB suspend/resume and remote wakeup are fully supported. The FT260 will be set to a power saving
status and the clock to most of the digital circuits will be stopped when the device is suspended.
Source Power and Power Consumption. The FT260 is capable of operating with a voltage supply of
+3.3V or +5.0V with a nominal operational mode current of 24mA, a nominal idle mode current of 5.6mA
and a nominal USB suspend mode current of 405µA. This allows greater margin for peripheral designs to
meet the USB suspend mode current limit of 2.5mA. An integrated level converter within the FT260
allows the device to interface with logic running at +1.8V, 2.5V or +3.3V. (Note: External pull-ups are
recommended for IO ± 2kV
Machine mode (MM)
> ± 200V
Charged Device Mode (CDM)
> ± 500V
Latch-up
> ± 200mA
Table 6.2 ESD and Latch-Up Specifications
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6.3 DC Characteristics
DC Characteristics (Ambient Temperature = -40°C to +85°C)
Parameter
VCC1
VCC2
Inormal
Description
Minimum
Typical
Maximum
Units
Conditions
4.5
5
5.5
V
VCCIN is supplied
with 5V
2.97
3.3
3.63V
V
VCCIN is supplied
with 3.3V
2.97
3.3
3.63
V
VCCIO is supplied
with 3.3V
2.25
2.5
2.75
V
VCCIO is supplied
with 2.5V
1.62
1.8
1.98
V
VCCIO is supplied
with 1.8V
9.6*
mA
Normal Operation at
12MHz
14.5*
mA
Normal Operation at
24MHz
VCCIN Operating Supply
Voltage
VCCIO Operating Supply
Voltage
Operating Supply
Current
23.6*
Iidle
Idle Supply Current
4.17
Isusp
Suspend Supply Current
356
mA
Normal Operation at
48MHz
mA
IDLE Operation at
30KHz
μA
USB Suspend
VCCIN must be
greater than 3V3
otherwise VOUT3V3
is an input which
must be driven with
3.3V
3V3
3.3v regulator output
2.97
3.3
3.63
V
VFSOURCE
eFUSE Blowing Supply
Voltage
3.4
3.8
4.2
V
Table 6.3 Operating Voltage and Current
* The current measurement is with the regular data transferring speed between USB and I2C/UART
interface. All the pins are with 4mA driving strength and without heavy loading.
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FT260 HID-CLASS USB TO UART/I2C BRIDGE IC
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Parameter
Description
Clearance No.: FTDI#484
Minimum
Typical
Maximum
Units
Conditions
2.97
VCCIO
VCCIO
V
2.97
VCCIO
VCCIO
V
I/O Drive strength*
= 8mA
2.97
VCCIO
VCCIO
V
I/O Drive strength*
= 12mA
2.97
VCCIO
VCCIO
V
I/O Drive strength*
= 16mA
Ioh = +/-2mA
Voh
Output Voltage High
I/O Drive strength*
= 4mA
Iol = +/-2mA
Vol
Output Voltage Low
0
0.4
V
0
0.4
V
I/O Drive strength*
= 8mA
0
0.4
V
I/O Drive strength*
= 12mA
0
0.4
V
I/O Drive strength*
= 16mA
0.8
V
LVTTL
V
LVTTL
LVTTL
I/O Drive strength*
= 4mA
Vil
Input low Switching
Threshold
Vih
Input High Switching
Threshold
Vt
Switching Threshold
1.49
V
Vt-
Schmitt trigger negative
going threshold voltage
1.15
V
Vt+
Schmitt trigger positive
going threshold voltage
1.64
V
Rpu
Input pull-up resistance
40
75
190
KΩ
Vin = 0
Rpd
Input pull-down
resistance
40
75
190
KΩ
Vin =VCCIO
Iin
Input Leakage Current
-10
+/-1
10
μA
Vin = 0
Ioz
Tri-state output leakage
current
-10
+/-1
10
μA
Vin = 5.5V or 0
2.0
Table 6.4 I/O Pin Characteristics VCCIO = +3.3V (except USB PHY pins)
* The I/O drive strength and slow slew-rate are configurable in eFUSE or external EEPROM
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Parameter
Description
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Minimum
Typical
Maximum
Units
Conditions
2.25
VCCIO
VCCIO
V
2.25
VCCIO
VCCIO
V
I/O Drive strength*
= 8mA
2.25
VCCIO
VCCIO
V
I/O Drive strength*
= 12mA
2.25
VCCIO
VCCIO
V
I/O Drive strength*
= 16mA
0
0.4
V
0
0.4
V
I/O Drive strength*
= 8mA
0
0.4
V
I/O Drive strength*
= 12mA
0
0.4
V
I/O Drive strength*
= 16mA
0.8
V
LVTTL
V
LVTTL
LVTTL
Ioh = +/-2mA
Voh
Output Voltage High
I/O Drive strength*
= 4mA
Iol = +/-2mA
Vol
Output Voltage Low
I/O Drive strength*
= 4mA
Vil
Input low Switching
Threshold
Vih
Input High Switching
Threshold
Vt
Switching Threshold
1.1
V
Vt-
Schmitt trigger negative
going threshold voltage
0.8
V
Vt+
Schmitt trigger positive
going threshold voltage
1.2
V
Rpu
Input pull-up resistance
40
75
190
KΩ
Vin = 0
Rpd
Input pull-down
resistance
40
75
190
KΩ
Vin =VCCIO
Iin
Input Leakage Current
-10
+/-1
10
μA
Vin = 0
Ioz
Tri-state output leakage
current
-10
+/-1
10
μA
Vin = 5.5V or 0
1.7
Table 6.5 I/O Pin Characteristics VCCIO = +2.5V (except USB PHY pins)
* The I/O drive strength and slow slew-rate are configurable in eFUSE or external EEPROM
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Parameter
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Minimum
Typical
Maximum
Units
Conditions
1.62
VCCIO
VCCIO
V
1.62
VCCIO
VCCIO
V
I/O Drive strength*
= 8mA
1.62
VCCIO
VCCIO
V
I/O Drive strength*
= 12mA
1.62
VCCIO
VCCIO
V
I/O Drive strength*
= 16mA
0
0.4
V
0
0.4
V
I/O Drive strength*
= 8mA
0
0.4
V
I/O Drive strength*
= 12mA
0
0.4
V
I/O Drive strength*
= 16mA
0.63
V
LVTTL
V
LVTTL
LVTTL
Ioh = +/-2mA
Voh
Output Voltage High
I/O Drive strength*
= 4mA
Iol = +/-2mA
Vol
Output Voltage Low
I/O Drive strength*
= 4mA
Vil
Input low Switching
Threshold
Vih
Input High Switching
Threshold
Vt
Switching Threshold
0.77
V
Vt-
Schmitt trigger negative
going threshold voltage
0.557
V
Vt+
Schmitt trigger positive
going threshold voltage
0.893
V
Rpu
Input pull-up resistance
40
75
190
KΩ
Vin = 0
Rpd
Input pull-down
resistance
40
75
190
KΩ
Vin =VCCIO
Iin
Input Leakage Current
-10
+/-1
10
μA
Vin = 0
Ioz
Tri-state output leakage
current
-10
+/-1
10
μA
Vin = 5.5V or 0
1.17
Table 6.6 I/O Pin Characteristics VCCIO = +1.8V (except USB PHY pins)
* The I/O drive strength and slow slew-rate are configurable in eFUSE or external EEPROM
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6.4 USB Characteristics
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
DC Characteristics
URo
Output impedance
3.5
7
14
Ω
URpu
Internal Pull Up
resistance
0.976
1.24
1.574
Ω
UVOH
High level Output on DP
and DM
2.8
UVOL
Low level Output on DP
and DM
V
0.3
V
AC Characteristics
UTrise
Rise Time on DP/DM
4
10
20
ns
UTfall
Fall Time on DP/DM
4
10
20
ns
UVcr
Cross point
1.3
2.0
V
UVth
Single-ended receiver
threshold
0.8
2.0
V
Table 6.7 USB I/O Pin (DP, DM) Characteristics
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FT260 Power Configurations
Section 7.1 to section 7.4 illustrates possible USB power configurations for the FT260. Section 7.5 shows
the configuration for system pins about DCNF0, DCNF1, XRESETN and other system pins. Section 7.6
shows the power for programming eFUSE.
7.1 USB Bus Powered Configuration
Figure 7.1 Bus Powered Configuration
Figure 7.1 illustrates the FT260 in a typical USB2.0 bus powered design configuration. A USB bus
powered device gets its power from the USB bus. Basic rules for USB bus powered devices are as follows
i)
ii)
iii)
iv)
v)
On plug-in to USB, the device should draw no more current than 100mA.
In USB Suspend mode the device should draw no more than 2.5mA.
A bus powered, high power USB device (one that draws more than 100mA) can use the
SUSPOUT_N function on the pin DIO7 as a power disable function and use it to keep the
current below 2.5mA on USB suspend.
A device that consumes more than 100mA cannot be plugged into a USB bus powered hub.
No device can draw more than 500mA from the USB bus.
The VCCIN pin is the power source for the FT260 and can directly connect to VBUS. When the I/O voltage
level is as +3.3V, users can directly connect VOUT3V3 to VCCIO without an external regulator. The
VBUS_DET pin is a 5V-tolerant input pin and can directly connect to VBUS without an on-board voltage
divider circuit. The power descriptors in the embedded eFUSE of the FT260 or in the external EEPROM
should be programmed to match the current drawn by the device.
A ferrite bead is connected in series with the USB power supply to reduce EMI noise from the FT260 and
associated circuitry being radiated down the USB cable to the USB host. The value of the Ferrite Bead
depends on the total current drawn by the application. A suitable range of Ferrite Beads is available from
Steward (www.steward.com), for example Laird Technologies Part # MI0805K400R-10.
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7.2 Self Powered Configuration with 5V Source Input
Figure 7.2 Self Powered Configuration with 5V Source Input
Figure 7.2 illustrates the FT260 in a typical USB2.0 self-powered configuration. A USB self-powered
device gets its power from its own power supply, 5V, and does not draw current from the USB bus. The
basic rules for USB self-powered devices are as follows –
i)
ii)
iii)
A self-powered device should not force current down the USB bus when the USB host or hub
controller is powered down.
A self-powered device can use as much current as it needs during normal operation and USB
suspend as it has its own power supply.
A self-powered device can be used with any USB host, a bus powered USB hub or a selfpowered USB hub.
VCCIN is the power source for the FT260 and will source power from its own power supply. When the I/O
voltage level is +3.3V, users can directly connect VOUT3V3 to VCCIO without an external regulator. The
power descriptors in the embedded eFUSE of the FT260 or in the external EEPROM should be
programmed as self-powered.
In order to comply with the first requirement above, the USB bus power (USB connector pin 1) is used to
control the VBUS_DET pin of the FT260 device. VBUS_DET is a 5V-tolerant input pin and can directly
connect to VBUS without an on-board voltage divider circuit. When the USB host or hub is powered up an
internal 1.5kΩ resistor on DP is pulled up to +3.3V, thus identifying the device to the USB host or hub.
When the USB host or hub is powered off, the VBUS_DET pin will be low and the FT260 is held in a
suspend state. In this state the internal 1.5kΩ resistor is not pulled up to any power supply (hub or host
is powered down), so no current flows down DP via the 1.5kΩ pull-up resistor. Failure to do this may
cause some USB host or hub controllers to power up erratically.
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7.3 Self Powered Configuration with 3.3V Source In
Figure 7.3 Self Powered Configuration with 3.3V Source Input
Figure 7.3 illustrates the FT260 in a typical USB self-powered configuration similar to Figure 7.2. The
difference here is that the self-power source is 3.3V. If using 3.3V as the power source in, remember to
connect it to VOUT3V3 to supply an operating voltage for USB signalling in the FT260.
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7.4 Bus Powered Configuration with +1.8V/+2.5V I/O Voltage
Figure 7.4 Bus Powered Configuration with +1.8V/+2.5V I/O voltage Level
Figure 7.4 illustrates the FT260 in a typical USB bus-powered configuration similar to Figure 7.1. The
difference here is that the I/O pin voltage source is 2.5V or 1.8V, not 3.3V. An external regulator can
source the power from VBUS and regulate out the required I/O voltage level. Then, VCCIO can connect to
the output of the regulator to achieve I/O voltage level operating at +1.8V or +2.5V. VCCIN should be
connected to VBUS to supply the power source for FT260 operation.
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7.5 Configuration for System Pins
Figure 7.5 Recommended FT260 Configuration of System Pins
The pins, DCNF0 and DCNF1, will determine one of 3 configurations for the FT260 as defined in Section
5.1. These 2 pins have internal pull-down resistors; these 2 pins can be left floating for logic-0. If logic-1
is applied for DCNF0 and/or DCNF1, a 10K Ohm resistor should be connected to VCCIO as shown in
Figure7.5.
The pin RESETN is the external reset source for the FT260. There is also a power-on-reset (POR) design
in the FT260. If there is no requirement for an external reset, RESETN can be left floating or weakly tied
to logic-high. If an external reset is required in the design, the related circuit in Figure 7.5 can be used
for reference.
The DEBUGGER pin is reserved for debugging purposes and should be tied to VCCIO, the I/O power
domain for the FT260. The pin, STEST_RESETN, is also a reserved pin and should be tied to logic-high.
Note that the GND pin located at pin-29 in Figure 7.5 is the paddle in the bottom side of the WQFN28
package. It should be tied together with the GND for FT260.
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7.6 Power for Programming eFUSE
Figure 7.6 FSOURCE for eFUSE
When the FT260 is in normal operation without programming the eFUSE, the FSOURCE pin can be left
floating. If the programming mechanism is required in the system, a power source with 3.8V should be
applied. Figure 7.6 shows the related components for FSOURCE.
The programmer module, UMFTPD3A, which is developed by FTDI, can supply the power source for
FSOURCE. With the programming utility FT_PROG, it can control the programming procedure and timing
to the embedded eFUSE in the FT260. Users can easily set the vendor specifying parameters which are
defined in eFUSE for customizing the FT260.
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Application Examples
The following diagrams show the possible applications of the FT260. The illustrations have omitted the
electrical design for the power domain plan. For power details refer to Section 7.
8.1 USB HID-over-I2C
Figure 8.1 Application Example 1: HID over I2C
In Figure 8.1, a HID-over-I2C device can easily connect to USB by integrating the FT260 into
With an on-board EEPROM for customization, the FT260 can connect to both EEPROM and
device with I2C slave interface simultaneously. DIO8 can be set as INTRIN, an interrupt input
a HID class device for the requirement of the HID-over-I2C specification. With 1K Ohm pull
on SCL and SDA, the I2C bus can run at HS mode.
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the system.
a HID class
source from
up resistors
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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.
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8.3 USB to RS485 Converter
Figure 8.3 Application Example 3: USB to RS485 Converter
An example of using the FT260 as a USB to RS485 converter is shown in Figure 8.3. In this application, a
TTL to RS485 level converter IC is used on the serial UART interface of the FT260 to convert the TTL
levels of the FT260 to RS485 levels.
The converter device requires separate enable signals on both the transmitter and receiver. With RS485,
the transmitter is only enabled when a character is being transmitted from the UART. Setting DIO0 as
TX_ACTIVE is provided for exactly the same purpose and wired to the transmitter enable (DE) of
converter device. The pin DIO12 of FT260 can be configured as PWREN_N and wired to the receiver
enable (RE) of the converter device. With these configurations of the pins, the FT260 can be used as the
USB to RS485 converter.
RS485 is a multi-drop network; so many devices can communicate with each other over a two wire cable
interface. The RS485 cable requires to be terminated at each end of the cable. A link (which provides the
120Ω termination) allows the cable to be terminated if the converter device is physically positioned at
either end of the cable.
In this example, the data transmitted by the FT260 is also present on the receive path of the converter
device. This is a common feature of RS485 and requires the application software to remove the
transmitted data from the received data stream. With the FT260, it is possible to do this entirely in
hardware by modifying the example shown in Figure 8.3 by logically OR-ing the FT260 TX_ACTIVE and
the receiver output (RO) of converter device then connecting the output of the OR gate to the RXD of
FT260.
Note that the TX_ACTIVE is activated 1 bit ahead the start bit. TX_ACTIVE is de-activated at the same
time as the stop bit. This is not configurable.
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8.4 USB to RS422 Converter
Figure 8.4 Application Example 4 : USB to RS422 Converter
An example of using the FT260 as a USB to RS422 converter is shown in Figure 8.4. In this application,
two TTL to RS422 Level Converter ICs are used on the serial UART interface of the FT260 to convert the
TTL levels of the FT260 to RS422 levels.
There are many suitable level converter devices available. In Figure 8.4, the converter devices have an
enable control (EN) to activate the data lines. Setting DIO7 as SUSPOUT_N allows the FT260 to disable
the level converters when the system is in suspend. SUSPENDOUT_N is an active-low signal. The DIO0
and DIO12 of the FT260 can be configured as TX_LED and RX_LED. The FT260 can toggle LEDs with
these signals when the UART interface is transmitting and receiving data.
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User Configuration
The FT260 provides two storage paths for customization. One is eFUSE which is embedded in the FT260;
another is the executable path to an external EEPROM. Parameters are defined for the customization and
are categorized into several groups. The groups are USB-related, GPIO function selection, pin feature
settings, UART settings and HID-over-I2C.
Embedded eFUSE provides a cost-effective customization. Without external devices, the FT260 can have
customised VID/PID for USB, driving strength for digital pins, GPIOA, GPIOG, GPIO2 configurations and
HID-over-I2C basic settings.
For customization demand, an EEPROM is required in the application. With this external EEPROM, more
parameters are defined for customization. In this storage area, parameters in eFUSE are all included.
USB string descriptor, pins status when USB suspending, and detailed pin configurations are included in
EERPOM. Details can refer to Section 9.2.2.
There is already a default value for each parameter in the design of the FT260. When the parameters in
eFUSE are programmed and enabled, the parameters in eFUSE will be loaded when the FT260 is powered
up or reset.
Both eFUSE and EEPROM for the FT260 can be programmed over USB. This method is the same as for
the MTP on other FTDI devices such as the FT-X series. Please note that in order to program eFUSE, the
FT260 requires an additional programming voltage (3.8V) on its FSOURCE pin. The programming board,
UMFTPD3A, supplies an easy connection bridge between the FT260 and a USB host for supplying the
power source, for timing control of eFUSE, and for communicating with the programming utility FT_Prog.
Further details may be found in the UMFTPD3A datasheet.
The FT_Prog utility is provided free-of-charge from the FTDI website, and can be found at the link below.
The user guide is also available at this link.
http://www.ftdichip.com/Support/Utilities.htm#FT_Prog
9.1 Programming the embedded eFUSE over USB
The eFUSE in the FT260 can be programmed over USB. This method is the same as for the MTP on other
FTDI devices such as the FT-X series. Note that in order to program eFUSE, the FT260 requires an
additional programming voltage (3.8V) on FSOURCE (pin-25 @ WQFN28 ; pin-1 @ TSSOP28). The
programming board, UMFTPD3A, can supply an easy connection bridge between the FT260 and a USB
host for supplying the power source to FSOURCE and for communicating with the programming utility
FT_Prog.
9.1.1 Default Values
The parameters defined in eFUSE are shown in Table 9.1. Default values are defined in the hardware
design of the FT260. If the parameters defined in eFUSE are enabled, the settings in eFUSE will replace
the default value.
Parameter
Default Value
Notes
USB Vendor ID (VID)
0403h
USB Vendor ID. Defined in the USB device descriptor. The
format is 16-bit hex coded and default is set as FTDI VID.
USB Product ID (PID)
6030h
USB Product ID. Defined in the USB device descriptor The
format is 16-bit hex coded and default is set as 6030h for
FT260.
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Parameter
Default Value
Notes
Power Source
Bus Powered
Define whether the power source is from the USB bus or a local
source.
Max Bus Power Current
100mA
The max power that will be drawn from VBUS when using bus
power. Range from 0~500mA. If the power source is defined as
self-powered, it must be set as 0mA.
Remote Wake Up
Enable
Define if the FT260 supports remote wake up or not.
The GPIO2 pin can be set as one of the alternative functions:
- GPIO2
GPIO2 Function
SUSPOUT_N
- PWREN# (low active), device ready indicator
- TX_LED, UART TX transferring indicator
- SUSPOUT_N, USB suspend low-active indicator.
The GPIOA pin can be set as one of the alternative functions:
GPIOA Function
TX_ACTIVE
- GPIOA
- TX_LED, UART TX transferring indicator
- TX_ACTIVE
The GPIOG pin can be set as one of the alternative functions:
- GPIOG
GPIOG Function
BCD_DET
- PWREN# (low active), device ready indicator
- RX_LED, UART RX receiving indicator
- BCD_DET, Battery Charger Detection indicator
UART Drive Strength
4mA
Adjustable drive strength for UART related pins TXD/RXD,
CTS/RTS, DTR/DSR, TX_ACTIVE. Drive strength can be set as
4mA, 8mA, 12mA and 16mA
GPIO Drive Strength
4mA
Adjustable drive strength for GPIO related pins GPIO0, GPIO1,
GPIO2, GPIO3, GPIO4, and GPIO5. Drive strength can be set as
4mA, 8mA, 12mA and 16mA
BCD_DET Function Disable?
No
BCD_DET Drive Strength
4mA
Adjustable drive strength for BCD_DET pin. Drive strength can
be set as 4mA, 8mA, 12mA and 16mA
BCD_DET Polarity
Active-high
Set the polarity on BCD_DET pin for indicating battery charge
detected. Default is set as active-high.
Power Saving Mode
Enable
If power saving mode is enable and the FT260 is idle for 5
seconds, it will switch the system clock to 30KHz for saving
power.
HID over I²C address
0h
The I²C slave address of the target HID-over-I²C device. The
address 0h means no HID-over-I²C device connected.
HID over I²C Descriptor
Address
0h
The start address of the descriptor of the target HID-over-I²C
device.
HID over I²C Interrupt
Rising Edge
Define the interrupt trigger type of the target HID-over-I²C
device. It can be: rising edge, falling edge, level-high, levellow.
Battery Charger
BCD_DET pin.
Detection
function
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be
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on
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Parameter
HID over I²C Option
Default Value
Supported
Clearance No.: FTDI#484
Notes
According to Microsoft HID over I²C Protocol Specification, the
following requests are optional:
-
GET_IDLE/SET_IDLE supported or not?
GET_PROTOCOL/SET_PROTOCOL
supported
SET_POWER supported or not?
or
not?
Table 9.1 Parameters defined in internal eFUSE for FT260
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9.2 Programming the external EEPROM over USB
The external EEPROM can be programmed over USB, which is supported by FT_PROG as most FTDI chips
do.
The FT_Prog utility is provided free-of-charge from the FTDI website, and can be found at the link below.
The user guide is also available at this link.
http://www.ftdichip.com/Support/Utilities.htm#FT_Prog
Please note that a user needs to specify the data address type as one-byte or two-byte when
programming the external EEPROM.
9.2.1 Supported EEPROM Spec
The FT260 supports an external EEPROM with I²C interface, slave address 0x50~0x57, and data size
larger than 256 bytes. When the FT260 powers on, it will scan the I²C bus and try to find if an external
EEPROM is present. If it is present, it will check the content and load the configuration data from the
EEPROM into the FT260. Note that loading data from an external EEPROM is the last step of power-on,
and it will overwrite the configuration data from eFUSE.
There are two different types of EEPROM. One has one-byte data address; the other one has two-byte
data address. Usually, the first one has a data size smaller than 256 bytes, and the second one has a
data size more than 256 bytes. It is not possible for the FT260 to automatically identify the EEPROM type,
therefore, FT_prog will require the user’s input to specify the type of the external EEPROM.
In summary, the supported external EEPROM has:
I²C interface with slave address 0x50~0x57
256 bytes at least
One-byte data address or two-byte data address
The protocol of one-byte data address EEPROM
Write:
ACK
8 bit data
STOP
8 bit
data addr
ACK
write
8 bit
data addr
ACK
7 bit slave
address
ACK
write
Start
7 bit slave
address
Read:
STOP
8 bit data
ACK
ACK
read
SR
ACK
Start
7 bit slave
address
Figure 9.1 Protocol Format for EEPROM with One Byte Data Address
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The protocol of two-byte data address EEPROM
Write:
STOP
7 bit slave
address
ACK
8 bit data
SR
2nd 8 bit
data addr
ACK
1st 8 bit
data addr
ACK
ACK
write
Start
7 bit slave
address
Read:
STOP
8 bit data
ACK
ACK
read
2nd 8 bit
data addr
ACK
1st 8 bit
data addr
ACK
ACK
write
Start
7 bit slave
address
Figure 9.2 Protocol Format for EEPROM with Two Bytes Data Address
Table9.2 shows the list of the external EEPROMs that are tested with the FT260.
Manufacturer
Part Number
Type
Atmel
AT24CS04-SSHM-TCT-ND 512 x 8
One-byte data address
Atmel
AT24C08D-PUM-ND 1K x 8
One-byte data address
Atmel
AT24CS16-SSHM-TCT-ND 2K x 8
One-byte data address
Atmel
AT24CM01 (1M bit)
Two-byte data address
On Semiconductor
CAT24C04WI-G-ND 512 x 8
One-byte data address
On Semiconductor
CAT24C08WI-GT3CT-ND 1k x 8
One-byte data address
On Semiconductor
CAT24C08WI-GT3CT-ND 2k x 8
One-byte data address
On Semiconductor
CAT24C512
Two-byte data address
Microchip
24AA08-I/SN-ND 1k x 8
One-byte data address
Microchip
24AA16-I/SN-ND 2k x 8
One-byte data address
Table 9.2 Tested EEPROM List for FT260
9.2.2 Default Values
The parameters defined in the EEPROM are shown in Table9.3. Default values are defined in the FT260. If
an EEPROM exists in the application, the priority of the EEPROM is higher than default values.
Parameter
Default Value
Notes
Device Type
FT260
Read-Only. Indicate the Chip is FT260.
USB Vendor ID (VID)
0403h
USB Vendor ID. Defined in the USB device descriptor. The
format is 16-bit hex coded and default is set as FTDI VID.
USB Product ID (PID)
6030h
USB Product ID. Defined in the USB device descriptor The
format is 16-bit hex coded and default is set as 6030h for
FT260.
USB Version
0200h
Power Source
Bus Powered
Define whether the power source is from the USB bus or a local
source.
Max Bus Power Current
100mA
The max power that will be drawn from VBUS when using bus
power. Range from 0~500mA. If the power source is defined as
self-powered, it must be set as 0mA.
Read-only. Returns the USB 2.0 device descriptor to the host.
Note: FT260 is a Full-speed USB2.0 device.
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Parameter
Default Value
Remote Wake Up
Enable
Manufacturer Name
FTDI
Product Description
FT260
Serial Number Enabled?
No
Serial Number
None
Suspend Out Polarity
Active-low
Clearance No.: FTDI#484
Notes
Define if the FT260 supports remote wake up or not.
Describing the manufacturer. A string descriptor defined in USB
device descriptors
Describing the product. A string descriptor defined in USB
device descriptors
Enable the string descriptor for serial number or not.
A unique serial number is generated and programmed into the
EEPROM. Refer to the Utility FT_Prog for details.
Set the polarity on GPIO2 pin for indicating suspend out.
Default is set as active-low.
UART RI can be the source to remote wakeup the USB host
when this remote wake up is allowed.
RI as Wake-Up
Disable
- Disable (default)
- Enable
Specify the criteria for RI to trigger a remote wake-up.
RI Wake-Up Config
Falling Edge
- Falling Edge(default), RI from Logic-High to Low
- Rising Edge, RI from Logic-Low to High
The GPIO2 pin can be set as one of the alternative functions:
- GPIO2
GPIO2 Function
SUSPOUT_N
- PWREN# (low active), device ready indicator
- TX_LED, UART TX transferring indicator
- SUSPOUT_N/SUSPOUT, USB suspend indicator
The GPIOA pin can be set as one of the alternative functions:
GPIOA Function
TX_ACTIVE
- GPIOA
- TX_LED, UART TX transferring indicator
- TX_ACTIVE
The GPIOG pin can be set as one of the alternative functions:
- GPIOG
GPIOG Function
BCD_DET
- PWREN# (low active), device ready indicator
- RX_LED, UART RX receiving indicator
- BCD_DET, Battery Charger Detection indicator
UART Drive Strength
4mA
UART Slew Rate Enable?
Disable
GPIO Drive Strength
4mA
Adjustable drive strength for UART related pins TXD/RXD,
CTS/RTS, DTR/DSR, TX_ACTIVE. Drive strength can be set as
4mA, 8mA, 12mA and 16mA
Set the slew rate control for UART related pins TXD/RXD,
CTS/RTS, DTR/DSR, TX_ACTIVE. Default is disabled
Adjustable drive strength for GPIO related pins GPIO0, GPIO1,
GPIO2, GPIO3, GPIO4, and GPIO5. Drive strength can be set as
4mA, 8mA, 12mA and 16mA
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Parameter
Default Value
Notes
GPIO Weak Pullup/Pulldown
Disable
Enable the weak pullup / pulldown resistor on the pins GPIO0,
GPIO1, GPIO2, GPIO3, GPIO4, and GPIO5. Default is disabled
(without any pull).
GPIO Slew Rate Enable?
Disable
Set the slew rate control for GPIO related pins GPIO0, GPIO1,
GPIO2, GPIO3, GPIO4, and GPIO5. Default is disabled
BCD_DET Function Disable?
No
BCD_DET Drive Strength
4mA
Adjustable drive strength for BCD_DET pin. Drive strength can
be set as 4mA, 8mA, 12mA and 16mA
BCD_DET Polarity
Active-high
Set the polarity on BCD_DET pin for indicating battery charge
detected. Default is set as active-high.
Interrupt Trigger
Level-high
Define the interrupt trigger type when GPIO3 is set as
INTR/WAKEUP function. The possible settings are: rising edge,
falling edge, level-high, level-low.
Trigger Level Setting
30ms
Interrupt level width select. When the interrupt is set to level
trigger and it exceeds the specified level width, the interrupt
signal will be generated. The level width can be set as 1ms,
5ms and 30ms.
Power Saving Mode
Enable
If power saving mode is enable and the FT260 is idle for 5
seconds, it will switch the system clock to 30KHz for saving
power.
Battery Charger Detection function can be disabled on
BCD_DET pin.
During suspend , each digital I/O pin of the FT260 can be set
as
- No change, keep the original pin function
Pin Status During Suspend
No change
- tristate
- push low when suspend
- push high when suspend
HID over I²C address
0h
The I²C slave address of the target HID-over-I²C device. The
address 0h means no HID-over-I²C device connected.
HID over I²C Descriptor
Address
0h
The start address of the descriptor of the target HID-over-I²C
device.
HID over I²C Interrupt
Rising Edge
Define the interrupt trigger type of the target HID-over-I²C
device. It can be: rising edge, falling edge, level-high, levellow.
According to Microsoft HID over I²C Protocol Specification, the
following requests are optional:
HID over I²C Option
Not supported
HID over I²C Subclass
No Subclass
HID over I²C Protocol
None
-
GET_IDLE/ SET_IDLE supported or not
GET_PROTOCOL/ SET_PROTOCOL supported or not
SET_POWER supported or not
The HID subclass description. It can be:
-
No Subclass
Boot Interface Subclass
The HID protocol code description. It can be:
-
None
Keyboard
Mouse
Table 9.3 Parameters defined in external EEPROM for FT260
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10 Package Parameters
The FT260 is available in WQFN-28 and TSSOP-28 package. The solder reflow profile for WQFN-28 and
TSSOP-28 is described in Section 10.5.
10.1 WQFN-28 Package Mechanical Dimensions
Figure 10.1 WQFN-28 Package Dimensions
The FT260Q is supplied in a RoHS2.0 compliant leadless WQFN-28 package. The package is lead (Pb)
free, and uses a ‘green’ compound. The package is fully compliant with European Union REACH
2006/121/EC.
This package is nominally 5.00mm x 5.00mm. The solder pads are on a 0.5mm pitch. The above
mechanical drawing shows the WQFN-28 package. All dimensions are in millimetres.
The centre pad on the base of the FT260Q is internally connected to GND and the PCB should not have
signal tracking on the top layer under this area. Connect to GND.
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10.2 WQFN-28 Package Markings
1
21
FTDI
Line 1 – FTDI Logo
XXXXXXXX
FT260Q
Line 2 – Wafer Lot Number
Line 3 – FTDI Part Number
YYWW-B
8
Line 4 – Date Code, Revision
14
Figure 10.2 WQFN-28 Package Markings
The date code format is YYWW where WW = 2 digit week number, YY = 2 digit year number. This is
followed by the revision number.
The code XXXXXXXX is the manufacturing LOT code
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10.3 TSSOP-28 Package Mechanical Dimensions
Figure 10.3 TSSOP-28 Package Dimensions
The FT260S is supplied in a RoHS2.0 compliant leadless TSSOP-28 package. The package is lead (Pb)
free, and uses a ‘green’ compound. The package is fully compliant with European Union REACH
2006/121/EC.
This package is nominally 9.70mm x 4.40mm. The above mechanical drawing shows the TSSOP-28
package. All dimensions are in millimetres.
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10.4 TSSOP-28 Package Markings
28
15
FTDI
Line 1 – FTDI Logo
XXXXXXXXXX
FT260S
Line 2 – Wafer Lot Number
Line 3 – FTDI Part Number
YYWW-B
1
Line 4 – Date Code, Revision
14
Figure 10.4 TSSOP-28 Package Markings
The date code format is YYWW where WW = 2 digit week number, YY = 2 digit year number. This is
followed by the revision number.
The code XXXXXXXX is the manufacturing LOT code
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10.5 Solder Reflow Profile
The FT260 is supplied in a Pb free WQFN-28 and TSSOP-28 package. The recommended solder reflow
profile is shown in Figure 10.3.
Temperature, T (Degrees C)
tp
Tp
Critical Zone: when
T is in the range
TL to Tp
Ramp Up
TL
tL
TS Max
Ramp
Down
TS Min
tS
Preheat
25
T = 25º C to TP
Time, t (seconds)
Figure 10.5 FT260 Solder Reflow Profile
The recommended values for the solder reflow profile are detailed in Table 10.1. Values are shown for
both a completely Pb free solder process (i.e. the FT260 is used with Pb free solder), and for a non-Pb
free solder process (i.e. the FT260 is used with non-Pb free solder).
Profile Feature
Pb Free Solder Process
Non-Pb Free Solder Process
Average Ramp Up Rate (Ts to Tp)
3°C / second Max.
3°C / Second Max.
Preheat
- Temperature Min (Ts Min.)
150°C
100°C
- Temperature Max (Ts Max.)
200°C
150°C
- Time (ts Min to ts Max)
60 to 120 seconds
60 to 120 seconds
217°C
183°C
60 to 150 seconds
60 to 150 seconds
260°C
240°C
20 to 40 seconds
20 to 40 seconds
Ramp Down Rate
6°C / second Max.
6°C / second Max.
Time for T= 25°C to Peak Temperature, Tp
8 minutes Max.
6 minutes Max.
Time Maintained Above Critical Temperature
TL:
- Temperature (TL)
- Time (tL)
Peak Temperature (Tp)
Time within 5°C of actual Peak Temperature
(tp)
Table 10.1 Reflow Profile Parameter Values
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11 Contact Information
Head Office – Glasgow, UK
Branch Office – Tigard, Oregon, USA
Future Technology Devices International Limited
Unit 1, 2 Seaward Place, Centurion Business Park
Glasgow G41 1HH
United Kingdom
Tel: +44 (0) 141 429 2777
Fax: +44 (0) 141 429 2758
Future Technology Devices International Limited (USA)
7130 SW Fir Loop
Tigard, OR 97223-8160
USA
Tel: +1 (503) 547 0988
Fax: +1 (503) 547 0987
E-mail (Sales)
E-mail (Support)
E-mail (General Enquiries)
E-mail (Sales)
E-mail (Support)
E-mail (General Enquiries)
sales1@ftdichip.com
support1@ftdichip.com
admin1@ftdichip.com
us.sales@ftdichip.com
us.support@ftdichip.com
us.admin@ftdichip.com
Branch Office – Taipei, Taiwan
Branch Office – Shanghai, China
Future Technology Devices International Limited (Taiwan)
2F, No. 516, Sec. 1, NeiHu Road
Taipei 114
Taiwan , R.O.C.
Tel: +886 (0) 2 8797 1330
Fax: +886 (0) 2 8751 9737
Future Technology Devices International Limited (China)
Room 1103, No. 666 West Huaihai Road,
Shanghai, 200052
China
Tel: +86 21 62351596
Fax: +86 21 62351595
E-mail (Sales)
E-mail (Support)
E-mail (General Enquiries)
E-mail (Sales)
E-mail (Support)
E-mail (General Enquiries)
tw.sales1@ftdichip.com
tw.support1@ftdichip.com
tw.admin1@ftdichip.com
cn.sales@ftdichip.com
cn.support@ftdichip.com
cn.admin@ftdichip.com
Web Site
http://ftdichip.com
Distributor and Sales Representatives
Please visit the Sales Network page of the FTDI Web site for the contact details of our distributor(s) and sales
representative(s) in your country.
System and equipment manufacturers and designers are responsible to ensure that their systems, and any Future Technology Devices
International Ltd (FTDI) devices incorporated in their systems, meet all applicable safety, regulatory and system-level performance
requirements. All application-related information in this document (including application descriptions, suggested FTDI devices and other
materials) is provided for reference only. While FTDI has taken care to assure it is accurate, this information is subject to customer
confirmation, and FTDI disclaims all liability for system designs and for any applications assistance provided by FTDI. Use of FTDI
devices in life support and/or safety applications is entirely at the user’s risk, and the user agrees to defend, indemnify an d hold
harmless FTDI from any and all damages, claims, suits or expense resulting from such use. This document is subject to change without
notice. No freedom to use patents or other intellectual property rights is implied by the publication of this document. Neither the whole
nor any part of the information contained in, or the product described in this document, may be adapted or reproduced in any material
or electronic form without the prior written consent of the copyright holder. Future Technology Devices International Ltd, Un it 1, 2
Seaward Place, Centurion Business Park, Glasgow G41 1HH, United Kingdom. Scotland Registered Company Number: SC136640
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Appendix A – References
Document References
Application Notes
AN_394 User Guide for FT260
AN_395 User Guide for LibFT260
AN_124 User Guide for FTDI FT_Prog Utility
AN_184 FTDI Device Input Output Pin States
AN_175 Battery Charger Detection Over USB with FT-X Devices
Technical Notes
TN_100 USB Vendor ID/Product ID Guidelines
TN_111 What is UART
Datasheets
DS_UMFT260EV
UMFTPD3A Program Module Datasheet
FT_PROG Utility
http://www.ftdichip.com/Support/Utilities.htm#FT_Prog
Related Document or Specification
http://i2c2p.twibright.com/spec/i2c.pdf
https://msdn.microsoft.com/en-us/library/windows/hardware/dn642101(v=vs.85).aspx
https://msdn.microsoft.com/en-US/library/jj131705(v=vs.85).aspx
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Acronyms and Abbreviations
Terms
Description
API
Application Programming Interface
CTS
Clear To Send
DCD
Direct Carrier Detect
DLL
Dynamic Link Library
DSR
Data Set Ready
DTR
Data Terminal Ready
EEPROM
GPIO
Electrically Erasable Programmable Read Only Memory
General Purpose Input Output
HID
Human Interface Device
I2C
Inter-Integrated Circuit
LDO
Low Drop Out regulator
LED
Light-emitting diode
POR
Power-On-Reset
RTS
Request To Send
SIE
Serial Interface Engine
SSOP
USB
UART
Shrink Small Outline Package
Universal Serial Bus
Universal Asynchronous Receiver/Transmitter
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Appendix B - List of Figures and Tables
List of Figures
Figure 2.1 FT260 Block Diagram ..................................................................................................... 4
Figure 3.1 Pin Configuration WQFN-28 (top-down view)..................................................................... 7
Figure 3.2 Pin Configuration TSSOP-28 (top-down view) .................................................................... 8
Figure 5.1 I2C Bus Protocol .......................................................................................................... 19
Figure 5.2 I2C Bus Timing ............................................................................................................ 20
Figure 5.3 UART RX Waveform consist of 8 data bits, 1 optional parity bit and 1 stop bit ..................... 25
Figure 5.4 UART TX Waveform consist of 7 data bits, no parity bit and 1 stop bit ................................ 25
Figure 5.5 UART TX Waveform consist of 7 data bits, 1 optional parity bit and 1 stop bit ..................... 25
Figure 5.6 UART TX Waveform consisting 7 data bits, 1 optional parity bit and 2 stop bits ................... 25
Figure 5.7 UART TX Waveform consisting 8 data bits, 1 optional parity bit and 2 stop bits ................... 25
Figure 7.1 Bus Powered Configuration ........................................................................................... 34
Figure 7.2 Self Powered Configuration with 5V Source Input ............................................................ 35
Figure 7.3 Self Powered Configuration with 3.3V Source Input .......................................................... 36
Figure 7.4 Bus Powered Configuration with +1.8V/+2.5V I/O voltage Level........................................ 37
Figure 7.5 Recommended FT260 Configuration of System Pins ......................................................... 38
Figure 7.6 FSOURCE for eFUSE ..................................................................................................... 39
Figure 8.1 Application Example 1: HID over I2C .............................................................................. 40
Figure 8.2 Application Example 2: USB to RS232 Converter ............................................................. 41
Figure 8.3 Application Example 3: USB to RS485 Converter ............................................................. 42
Figure 8.4 Application Example 4 : USB to RS422 Converter ............................................................ 43
Figure 9.1 Protocol Format for EEPROM with One Byte Data Address ................................................. 47
Figure 9.2 Protocol Format for EEPROM with Two Bytes Data Address ............................................... 48
Figure 10.1 WQFN-28 Package Dimensions .................................................................................... 51
Figure 10.2 WQFN-28 Package Markings ........................................................................................ 52
Figure 10.3 TSSOP-28 Package Dimensions ................................................................................... 53
Figure 10.4 TSSOP-28 Package Markings ....................................................................................... 54
Figure 10.5 FT260 Solder Reflow Profile ......................................................................................... 55
List of Tables
Table 3.1 FT260 Pin Description .................................................................................................... 11
Table 5.1 FT260 USB Device Interface Configuration ....................................................................... 17
Table 5.2 I2C Timing for VCCIO=3.3V ............................................................................................ 21
Table 6.1 Absolute Maximum Ratings ............................................................................................ 28
Table 6.2 ESD and Latch-Up Specifications .................................................................................... 28
Table 6.3 Operating Voltage and Current ....................................................................................... 29
Table 6.4 I/O Pin Characteristics VCCIO = +3.3V (except USB PHY pins) ........................................... 30
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Table 6.5 I/O Pin Characteristics VCCIO = +2.5V (except USB PHY pins) ........................................... 31
Table 6.6 I/O Pin Characteristics VCCIO = +1.8V (except USB PHY pins) ........................................... 32
Table 6.7 USB I/O Pin (DP, DM) Characteristics .............................................................................. 33
Table 9.1 Parameters defined in internal eFUSE for FT260 ............................................................... 46
Table 9.2 Tested EEPROM List for FT260 ........................................................................................ 48
Table 9.3 Parameters defined in external EEPROM for FT260 ............................................................ 50
Table 10.1 Reflow Profile Parameter Values .................................................................................... 55
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Appendix C - Revision History
Document Title:
FT260 HID-class USB to UART/I2C Bridge IC
Document Reference No.:
FT_001272
Clearance No.:
FTDI#484
Product Page:
http://www.ftdichip.com/Products/ICs/FT260.html
Document Feedback:
Send Feedback
Revision
Changes
Date
Version 1.0
Initial Release
2016-02-23
Version 1.1
Updated to include FT260S
information
2016-05-23
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