AX5243 datasheet(4/42 Pages) ONSEMI

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AX5243

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Table 1. PIN FUNCTION DESCRIPTIONS

Symbol

Pin(s)

Type

Description

VDD_ANA

Analog power output, decouple to neighboring GND

GND

Ground, decouple to neighboring VDD_ANA

ANTP

Differential antenna input/output

ANTN

Differential antenna input/output

VDD_ANA

Analog power output, decouple to GND

FILT

Optional synthesizer filter

Optional synthesizer inductor, should be shorted with L1 if not used.

Optional synthesizer inductor, should be shorted with L2 if not used.

SYSCLK

I/O

Default functionality: Crystal oscillator (or divided) clock output

Can be programmed to be used as a general purpose I/O pin

Selectable internal 65 kW pull−up resistor

SEL

Serial peripheral interface select

CLK

Serial peripheral interface clock

MISO

Serial peripheral interface data output

MOSI

Serial peripheral interface data input

IRQ

I/O

Default functionality: Transmit and receive interrupt

Can be programmed to be used as a general purpose I/O pin

Selectable internal 65 kW pull−up resistor

TCXO_EN

I/O

General purpose I/O pin which can be programmed to enable an

external TCXO

Selectable internal 65 kW pull−up resistor

VDD_IO

Power supply 1.8 V – 3.3 V

GPADC1

GPADC input, must be connected to GND if not used

GPADC2

GPADC input, must be connected to GND if not used

CLK16N

Crystal oscillator input/output

CLK16P

Crystal oscillator input/output

GND

Center pad

Ground on center pad of QFN, must be connected

A = analog input

I = digital input signal

O = digital output signal

I/O = digital input/output signal

N = not to be connected

P = power or ground

All digital inputs are Schmitt trigger inputs, digital input

and output levels are LVCMOS/LVTTL compatible and 5 V

tolerant.

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