DS620-3 Jan ‘07

©2007 Reg. No. 227 4001, ENGLAND

Page 3

RF620T

RF620R

SmartRadio Transmitter / Receiver

RF620R - Pin Description

Pin No

Name

Description

1

Vcc-RF

+5V Supply Voltage – RF section.

2

GND-RF

RF Ground.

3

ANT

Connect Antenna to this input.

7

GND-RF

RF Ground.

11

GND-AF

AF Ground.

13

RSSI

Received Signal Strength Indicator (RSSI)

14

O/P-AF

Raw Data output from RF receiver (CMOS/TTL signal)

15

Vcc-digital

+5V Supply Voltage – digital section.

16

GND-digital

AF Ground – digital section.

17

MCLR

Pulls Microcontroller into reset if connected to Ground

May be left unconnected if not required (internally tied high)

19

\Serial Data

Serial data output, active low

20

\RTS

/RTS input, active low

21

\Learn

&

\LED

Dual function:

Programming Switch input, When grounded places the module into ‘learn’ mode.

External LED output, Indicates data reception, and programming status.

22

spare

leave unconnected

23

spare

leave unconnected

24

O/P1

Data Output 1. (has a 220

Ω series resistor)

25

O/P2

Data Output 2. (has a 220

Ω series resistor)

RF620R - Typical application circuit

RF620R

13

711

15

20

25

Vcc

GND

22

O/P 2

O/P 1

Vcc

Status

LED

LED drive example

Serial data output,

CMOS/TTL Level

RTS input

Learn Switch

1k

470R