FT121 datasheet(7/46 Pages) FTDI

7 / 46 page

Document No.: FT_000648

FT121 ENHANCED USB DEVICE CONTROLLER WITH SPI SLAVE IC

Datasheet Version 1.2

Clearance No.: FTDI#

312

3.3 Pin Description

PIN No.

(TSSOP-

16)

PIN No.

(QFN-

16)

PIN NAME

TYPE

DESCRIPTION

BCD_n

USB Charger detector output

SCLK

SPI clock input

SS_n

SPI slave select input

GND

Ground

VCCIO

IO Supply Voltage; 1.8V, 2.5V or 3.3V

SUSPEND

I,OD

Device suspend (output) and wakeup (input)

INT_n

Interrupt (Active Low)

MISO

4-wire mode: SPI slave output

3-wire mode: no function. Leave it un-connected

MOSI

I/IO

4-wire mode: SPI salve input

3-wire mode: SPI data input/output

VBUS_S

Vbus sensing input

RESET_n

Asynchronous reset (Active Low)

VOUT3V3

3.3V regulator output for 5V operation;

To operate the IC at 3.3 V, supply 3.3 V to both

the VCC and VOUT3V3 pins

VCC

Power supply (3.3V or 5V)

GND

Ground

AIO

USB data signal minus

AIO

USB data signal plus

GND

Ground

Center bottom pad – may be left unconnected

VCCIO

IO Supply Voltage; 1.8V, 2.5V or 3.3V

Center bottom pad – may be left unconnected

VOUT3V3

3.3V regulator output for 5V operation;

To operate the IC at 3.3 V, supply 3.3 V to both

the VCC and VOUT3V3 pins

Center bottom pad – may be left unconnected

VCC

Power supply (3.3V or 5V)

Center bottom pad – may be left unconnected

Table 3.1 FT121 Pin Description

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