FT121T-R FTDI, FT121T-R Datasheet - Page 4

• Manufacturer Part Number: FT121T-R
• Description: USB Interface IC USB CONTROLLER W/SPI SLAVE IC
• Manufacturer: FTDI

Specifications of FT121T-R

• Rohs: yes
• Product: USB 2.0
• Interface Type: SPI, USB
• Operating Supply Voltage: 4 V to 5.5 V
• Operating Supply Current: 3.9 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-16
• Minimum Operating Temperature: - 40 C

Table of Contents
1
2
3
4
5
6
1.1
1.2
3.1
3.2
3.3
4.1
4.2
4.3
5.1
5.2
6.1
6.2
6.3
4.3.1
4.3.2
4.3.3
4.3.4
6.2.1
6.2.2
6.2.3
6.2.4
6.2.5
6.3.1
6.3.2
6.3.3
6.3.4
6.3.5
6.3.6
6.3.7
6.3.8
6.3.9
6.3.10
Typical Applications ...................................................................... 2
Block Diagrams ............................................................................ 3
Device Pin Out and Signal Description .......................................... 6
Function Description..................................................................... 8
Endpoint Buffer Management ..................................................... 13
Commands and Registers ........................................................... 16
Part Numbers...................................................................................... 2
USB Compliant .................................................................................... 2
TSSOP-16 Package Pin Out ................................................................. 6
QFN-16 Package Pin Out ..................................................................... 6
Pin Description ................................................................................... 7
Functional Block Descriptions ............................................................. 8
Interrupt Modes .................................................................................. 9
SPI Slave Interface ............................................................................. 9
Endpoint Buffer Management in Default Mode .................................. 13
Endpoint Buffer Management in Enhanced Mode .............................. 14
Command Summary .......................................................................... 16
Initialization Commands ................................................................... 21
Data Flow Commands ....................................................................... 24
4-wire write operation ................................................................................................ 10
4-wire read operation ................................................................................................. 10
3-wire write operation ................................................................................................ 11
3-wire read operation ................................................................................................. 11
Set Address Enable .................................................................................................... 21
Set Endpoint Enable ................................................................................................... 21
Set Mode .................................................................................................................. 21
Set Interrupt ............................................................................................................. 23
Set Endpoint Configuration (for Enhanced Mode) ........................................................... 23
Read Interrupt Register .............................................................................................. 24
Select Endpoint ......................................................................................................... 26
Read Last Transaction Status ...................................................................................... 26
Read Endpoint Status ................................................................................................. 27
Read Buffer ............................................................................................................... 28
Write Buffer .............................................................................................................. 28
Clear Buffer .............................................................................................................. 28
Validate Buffer .......................................................................................................... 28
Set Endpoint Status ................................................................................................... 29
Acknowledge Setup ................................................................................................ 29
Copyright © 2012 Future Technology Devices International Limited
FT121 ENHANCED USB DEVICE CONTROLLER WITH SPI SLAVE IC
Document No.: FT_000648
Clearance No.: FTDI#
Datasheet Version 1.0
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