PT4501 datasheet(5/6 Pages) PTC

5 / 6 page

PT4501

PRE1.1

September 2014

PIN DESCRIPTION

Pin No.

Pin Name

I/O

Description

VRF

Regulated 1.8V voltage for RF domain of receive chain

VSSLNA

Ground for low noise amplifier (LNA)

RXIN

Receiver RF input, connected to antenna through matching

circuit

TXOUT

Transmitter RF output, connected to antenna through

matching circuit

—

No connection

VDDTX

External supply voltage for transmit and LO chains, 3 V

input

AVDD

External supply voltage for analog domain, 3 V input

VVCO

Regulated 1.8V supply voltage for VCO

Crystal oscillator input

Crystal oscillator output

TVDD

External supply voltage for digital domain, 3 V input

Regulated 1.8V supply voltage for digital domain

TXRXHW

TX/RX hardware control pin

RFSEL

RF frequency band (433.92/915 MHz) select pin

GIO

I/O

General purpose input/output, 3 V logic

4-wire SPI interface low active slave select, 3 V logic

MISO

4-wire SPI interface serial data output, 3 V logic

MOSI

4-wire SPI interface serial data input, 3 V logic

SCLK

4-wire SPI interface serial clock, 3 V logic

Chip-enable control pin, 3 V logic

(CE = H = chip enable; CE = L = chip disable)

CWTHRE

I/O

Threshold voltage for carrier sense window

RSSI

Received signal strength indicator voltage

CSF_VTUNE

I/O

Tuning voltage for channel select filter

VIF

Regulated 1.8V voltage for analog domain of receive chain

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