CP3UB26 datasheet(12/268 Pages) NSC

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Table 3

CP3UB26 LQFP-144 Signal Descriptions

Name

Pins

I/O

Primary Function

Alternate

Name

Alternate Function

X1CKI

Input

12 MHz Oscillator Input

BBCLK

BB reference clock for the RF Interface

X1CKO

Output

12 MHz Oscillator Output

None

X2CKI

Input

32 kHz Oscillator Input

None

X2CKO

Output

32 kHz Oscillator Output

None

RESET

Input

Chip general reset

None

ENV0

I/O

Special mode select input with

internal pull-up during reset

PLLCLK

PLL Clock Output

ENV1

I/O

Special mode select input with

internal pull-up during reset

CPUCLK

CPU Clock Output

ENV2

I/O

Special mode select input with

internal pull-up during reset

SLOWCLK

Slow Clock Output

TMS

Input

JTAG Test Mode Select

(with internal weak pull-up)

None

TCK

Input

JTAG Test Clock Input

(with internal weak pull-up)

None

TDI

Input

JTAG Test Data Input

(with internal weak pull-up)

None

TDO

Output

JTAG Test Data Output

None

RDY

Output

NEXUS Ready Output

None

VCC

Input

2.5V Core Logic

Power Supply

None

GND

Input

Core Ground

None

IOVCC

Input

2.5

–3.3V I/O Power Supply

None

IOGND

Input

I/O Ground

None

AVCC

Input

PLL Analog Power Supply

None

AGND

Input

PLL Analog Ground

None

ADVCC

Input

ADC Analog Power Supply

None

ADGND

Input

ADC Analog Ground

None

SCL

I/O

ACCESS.bus Clock

None

SDA

I/O

ACCESS.bus Serial Data

None

D-

I/O

USB D- Upstream Port

None

D+

I/O

USB D+ Upstream Port

None

UVCC

Input

3.3V USB Transceiver Supply

None

UGND

Input

USB Transceiver Ground

None

ADC0

I/O

ADC Input Channel 0

TSX+

Touchscreen X+ contact

ADC1

I/O

ADC Input Channel 1

TSY+

Touchscreen Y+ contact

ADC2

I/O

ADC Input Channel 2

TSX-

Touchscreen X- contact

ADC3

I/O

ADC Input Channel 3

TSY-

Touchscreen Y- contact

CP3UB26 Datasheet(PDF) 12 Page - National Semiconductor (TI)

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