Rev. 3.5

RI-RFM-006A

Page 5 of 19

! Description of Pins

Pin #

Signal

I/O

Description

1

A3OP

O

Signal output from CMOS inverter-3 amplifier; this pin is connected to the

internal FSK signal digital demodulator.

2

A3IN

I

Signal input to CMOS inverter-3 amplifier; if an external circuit is used to

amplify FSK signals, the amplified signals are input through this pin.

3

A2OP

O

Signal output from CMOS inverter-2 amplifier.

4

A2IN

I

Signal input to CMOS inverter-2 amplifier.

5

A1OP

O

Signal output from CMOS inverter-1 amplifier.

6

A1IN

I

I 16. Signal input to CMOS inverter-1 amplifier.

7

TXLO

Negative open

drain output

Negative level output of transmission signals; this output drives the

n-channel MOSFET used as antenna driver.

8

TXHI

Positive open

drain output

Positive level output of transmission signals; this output drives the

p-channel MOSFET used as antenna driver.

9

OSCI

I

Signal input to 17.1776 MHz master clock oscillator.

10

OSCO

O

Signal output from 17.1776 MHz master clock oscillator.

11

GND

-

Negative power supply.

12

VCC

-

Positive power supply.

13

TPC

I, w/pull-up

resistor

Input of transmission power selection signals (High-Low). A Low level

signal input through this pin substantially lowers the power during

transmission.

14

TXCT-

I, w/pull-up

resistor

Input of transmission output control signals (Transmit-Receive Mode

Selector). A Low level signal input through this pin outputs a transmission

signal to either “TXLO/TXHI” pin while a High level signal input turns the

mode to Receive and activates the internal FSK signal digital demodulator.

15

RXDT-

O

Serial output of demodulated FSK signal bit data. Negative level output

when the bit data received from the remote transponder is “1”, and positive

level output when it is “0”.

Note: The RI-RFM-006A has a reverse polarity in relation to TIRIS

standard RF-modules.

16

RXCK

O

Synchronous clock output of demodulated FSK signal data; a clock signal

synchronized with the “RXDT-“ signal is output.