5th Generation Hi-Speed USB Flash Media and CIR Controller with Integrated Card Power FETs

Datasheet

Revision 1.3 (07-12-05)

20

SMSC USB2231/USB2232

DATASHEET

Notes:

■

Hot-insertion capable card connectors are required for all flash media. It is required for SD

connector to have Write Protect switch. This allows the chip to detect MMC card.

■

nMCE is normally asserted except when the 8051 is in standby mode.

6.2

Buffer Type Descriptions

CIR

IR Receive Data

IR_RXD

I

IR_RXD, is the CIR receiver input.

DIGITAL POWER, GROUNDS, and NO CONNECTS

1.8v Digital Core

Power

VDD18

+1.8V Core power

All VDD18 pins must be connected together on the

circuit board.

3.3v Power & &

Voltage Regulator

Input

VDD33

3.3V Power & Regulator Input.

Pins 100 & 108 supply 3.3V power to the internal 1.8V

regulators.

Ground

VSS

Ground Reference

Table 6.2 USB2231/USB2232 Buffer Type Descriptions

BUFFER

DESCRIPTION

I

Input

IPU

Input with internal weak pull-up resistor.

IPD

Input with internal weak pull-down resistor.

IS

Input with Schmitt trigger

I/O8

Input/Output buffer with 8mA sink and 8mA source.

I/O8PU

Input/Output buffer with 8mA sink and 8mA source, with an internal weak pull-up resistor.

I/O8PD

Input/Output buffer with 8mA sink and 8mA source, with an internal weak pull-down

resistor.

O8

Output buffer with 8mA sink and 8mA source.

O8PU

Output buffer with 8mA sink and 8mA source, with an internal weak pull-up resistor.

O8PD

Output buffer with 8mA sink and 8mA source, with an internal weak pull-down resistor.

ICLKx

XTAL clock input

OCLKx

XTAL clock output

I/O-U

Analog Input/Output Defined in USB specification

AIO

Analog Input/Output

Table 6.1 USB2231/USB2232 Pin Descriptions

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION