 2005-2016 Microchip Technology Inc.

DS00002252A-page 17

USB2229/USB2230

Note 1: 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.

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

5.2

Buffer Type Descriptions

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 5-2:

USB2229/USB2230 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 5-1:

USB2229/USB2230 PIN DESCRIPTIONS (CONTINUED)

Name

Symbol

Buffer Type

Description