FT4222HQ-C-R datasheet(38/49 Pages) FTDI

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FT4222H USB2.0 TO QUADSPI/I2C BRIDGE IC

1.3

Document No.: FT_001011 Clearance No.: FTDI#405

Internal OTP Memory Configuration

The FT4222H includes an internal OTP memory which holds the USB configuration descriptors, other

configuration data for the chip and also user data areas. Following a power-on reset or a USB reset the

FT4222H will scan its internal OTP memory and read the USB configuration descriptors stored there.

In many cases, the default values programmed into the OTP memory will be suitable and no re-

programming will be necessary. The defaults can be found in Section 9.1.

The OTP memory in the FT4222H can be programmed over USB if the values need to be changed for a

particular application. Further details of this are provided from section 9.2 onwards.

Users who do not have their own USB Vendor ID but who would like to use a unique Product ID in their

design can apply to FTDI for a free block of unique PIDs. See TN_100 – USB Vendor ID/Product ID

Guidelines for more details.

9.1

Default Values

The default factory programmed values of the internal OTP memory are shown in Table9.1.

Parameter

Default Value

Notes

Device Type

FT4222H

Read-Only. Indicate the Chip is FT4222H.

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)

601Ch

USB Product ID. Defined in the USB device

descriptor The format is 16-bit hex coded and

default is set as FTDI VID.

USB Version

0200h

Read-only. Returns the USB 2.0 device descriptor

to the host.

Note: FT4222H is a Hi-speed USB2.0 device. If the

connected host/hub is full speed only, the FT4222H

will operate at full speed without changing this USB

version parameter to USB1.1.

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 FT4222H supports remote wake up or

not.

Manufacturer Name

FTDI

Describing the manufacturer. A string descriptor

defined in USB device descriptors

Product Description

FT4222

Describing the product. A string descriptor defined

in USB device descriptors

Serial Number Enabled?

Enable the string descriptor for serial number or

not.

FT4222HQ-C-R Datasheet(PDF) 38 Page - Future Technology Devices International Ltd.

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