User's Manual

Pin Definition

Pin #

Pin Name Pad Type Description

1 UART_CTS CMOS input with weak internal pull-down UART clear to send active low

2 UART_RTS

Bi-directional CMOS output, tri-state, with weak

internal pull-up

UART request to send active low

3 UART_RX CMOS input with weak internal pull-down UART data input

4 UART_TX

Bi-directional CMOS output, tri-state, with weak

internal pull-up

UART data output

5 VDD_MEM VDD Regulator input

Input to internal low-voltage linear regulator for

non-audio core circuitry (1.8V~2.7V)

6 VREGIN_L

Positive supply for Flash pads (2.7V~3.6V)

7 VDD_PIO VDD

Positive supply for PIO,AUX DAC and SPI/PCM

ports (3.1V~3.6V)(1)

8 GND Ground Digital Ground

9 RESET# CMOS input with weak internal pull-up

Reset if low. Input debounced so must be low for

>5ms to cause a reset

10 PIO[10]

Bi-directional with pro

rammable stren

th internal

pull-up/down