FT260S-U Datasheet, PDF (44/61 Pages) Future Technology Devices International Ltd. – HID-class USB to UART/I2C Bridge IC

FT260 HID-CLASS USB TO UART/I2C BRIDGE IC
Version 1.1
Document No.: FT_001272 Clearance No.: FTDI#484
9 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)
USB Product ID (PID)
0403h
6030h
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. 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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