FT121T-R FTDI, FT121T-R Datasheet - Page 16

• 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

6
The FT121 supports two command sets: a default command set (Table 6-1) and an enhanced command
set (Table 6-2). The enhanced command set is activated if any of the Set Endpoint Configuration
commands (0xB0-0xBF) are received by the FT121. Otherwise, the default command set shall be valid.
6.1
Command Name
Set Address Enable
Set Endpoint Enable
Set Mode
Set Interrupt
Read Interrupt Register
Select Endpoint
Read Last Transaction Status
Read Endpoint Status
Commands and Registers
Command Summary
Copyright © 2012 Future Technology Devices International Limited
FT121 ENHANCED USB DEVICE CONTROLLER WITH SPI SLAVE IC
Target
Device
Device
Device
Device
Device
Endpoint 0 OUT
Endpoint 0 IN
Endpoint 1 OUT
Endpoint 1 IN
Endpoint 2 OUT
Endpoint 2 IN
Endpoint 0 OUT
Endpoint 0 IN
Endpoint 1 OUT
Endpoint 1 IN
Endpoint 2 OUT
Endpoint 2 IN
Endpoint 0 OUT
Endpoint 0 IN
Endpoint 1 OUT
Endpoint 1 IN
Endpoint 2 OUT
Initialization Commands
Data Flow Commands
Code (hex)
D0h
D8h
F3h
FBh
F4h
00h
01h
02h
03h
04h
05h
40h
41h
42h
43h
44h
45h
80h
81h
82h
83h
84h
Document No.: FT_000648
Clearance No.: FTDI#
Data phase
Write 1 byte
Write 1 byte
Write 2 bytes
Write 1 byte
Read 2 bytes
Read 1 byte (optional)
Read 1 byte (optional)
Read 1 byte (optional)
Read 1 byte (optional)
Read 1 byte (optional)
Read 1 byte (optional)
Read 1 byte
Read 1 byte
Read 1 byte
Read 1 byte
Read 1 byte
Read 1 byte
Read 1 byte
Read 1 byte
Read 1 byte
Read 1 byte
Read 1 byte
Datasheet Version 1.0
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