Copyright © 2013 Future Technology Devices International Limited

5

FT221X USB 8-BIT SPI/FT1248 IC Datasheet

Version 1.3

Document No.: FT_000630 Clearance No.: FTDI# 263

Table of Contents

1

Typical Applications...................................................................... 2

1.1

Driver Support .................................................................................... 2

1.2

Part Numbers...................................................................................... 2

1.3

USB Compliant .................................................................................... 3

2

FT221X Block Diagram ................................................................. 4

3

Device Pin Out and Signal Description.......................................... 7

3.1

20-LD QFN Package ........................................................................... 7

3.1.1

QFN Package PinOut Description ....................................................................................7

3.2

20-LD SSOP Package.......................................................................... 9

3.2.1

SSOP Package PinOut Description ..................................................................................9

3.3

CBUS Signal Options ......................................................................... 11

4

Function Description................................................................... 12

4.1

Key Features..................................................................................... 12

4.2

Functional Block Descriptions ........................................................... 12

5

FT1248 Interface Description. .................................................... 14

5.1

Determining the Dynamic Bus Width ................................................ 14

5.2

Supported Commands on the FT1248 Interface ................................ 15

5.3

LSB or MSB Selection ........................................................................ 16

5.4

Clock Phase/Polarity ........................................................................ 16

5.4.1

CPHA = 1 ................................................................................................................. 17

5.5

FT1248 Timing .................................................................................. 18

6

Devices Characteristics and Ratings ........................................... 20

6.1

Absolute Maximum Ratings............................................................... 20

6.2

ESD and Latch-up Specifications....................................................... 20

6.3

DC Characteristics............................................................................. 21

6.4

MTP Memory Reliability Characteristics ............................................ 25

6.5

Internal Clock Characteristics........................................................... 25

7

USB Power Configurations.......................................................... 26

7.1

USB Bus Powered Configuration ...................................................... 26

7.2

Self Powered Configuration .............................................................. 27

7.3

USB Bus Powered with Power Switching Configuration .................... 28

7.4

USB Battery Charging Detection ....................................................... 29

8

Application Examples ................................................................. 30

8.1

USB to FT1248 Converter.................................................................. 30

9

Internal MTP Memory Configuration........................................... 33