FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC
Datasheet
Version 2.4
Document No.: FT_000060 Clearance No.: FTDI#78
7 EEPROM Configuration
If an external EEPROM is fitted (93LC46/56/66) it can be programmed over USB using FT_PROG. The
EEPROM must be 16 bits wide and capable or working at a VCC supply of +3.0 to +3.6 volts.
Adding an external EEPROM allows selecting the TXDEN for RS485 mode when asynchronous serial
interface has been selected.
Figure 7.1 EEPROM Interface
The external EEPROM can also be used to customise the USB VID, PID, Serial Number, Product Description
Strings and Power Descriptor value of the FT4232H for OEM applications. Other parameters controlled by
the EEPROM include Remote Wake Up, Soft Pull Down on Power-Off and I/O pin drive strength.
If no EEPROM is connected (or the EEPROM is blank), the FT4232H uses its built-in default VID (0403), PID
(6011) Product Description and Power Descriptor Value. In this case, the device will not have a serial
number as part of the USB descriptor.
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