–

–

–

–

4

5

Pin Assignments

Figure 6: MS Series Encoder Pin Assignments

10

MODE_IND

O

Mode Indicator Output. This line

is activated while the encoder

is in Create Mode, allowing the

connection of an LED. The line is

high for the entire time the encoder

is in Create Mode, indicating that it

is creating a new Address.

11

CREATE_ADDR

I

Create Mode Selection Line. When

this line is taken high, the encoder

enters Create Mode and randomly

generates a new Address. The

Address continuously randomized

while this line is high, and is saved

as soon as the line is taken low.

12

SEND

I

Encoder Send Data Line. When

this line goes high, the encoder

records the states of the data

lines, retrieves the Address from

memory, assemble sthe packet,

and outputs it as a serial bit stream

on the DATA_OUT line at the baud

rate selected by the states of the

SEL_BAUD lines.

15, 16

V

CC

Supply Voltage

None of the input lines have internal pull-up or pull-down resistors. The input lines must

always be in a known state (either GND or V

be predictable. The designer must ensure that the input lines are never floating, either

by using external resistors, by tying the lines directly to GND or V

circuits to control the line state.

Pin Descriptions

Pin Number

Name

I/O

Description

1, 2, 13, 14, 17–20

DO–D7

I

Data Input Lines. The state of

these lines are captured when

the SEND line goes high and

encoded for transmission. Upon

successful reception, these states

are reproduced on the outputs of

the decoder.

3

SEL_BAUD0

I

Baud Rate Selection Line 0. This

line along with SEL_BAUD1 sets

the baud rate of the serial data

stream to one of 4 possible rates.

The rate must be set before power

on.

4

SEL_BAUD1

I

Baud Rate Selection Line 1. This

line along with SEL_BAUD0 sets

the baud rate of the serial data

stream to one of 4 possible rates.

The rate must be set before power

on.

5, 6, 7

GND

Ground

8

TX_CNTL

0

External Transmitter Control Line.

This line goes high when the SEND

line goes high, and low when the

SEND line goes low. This can be

used to power up an external

RF or infrared transmitter when

the encoder is sending data, and

power it down when the encoder

is asleep. It can also be used to

drive a LED for visual transmit

indication.

9

DATA_OUT

0

Serial Data Output. The encoder

outputs a serial data stream on this

line. This line can directly interface

with all Linx RF transmitter

modules.

Figure 7: Pin Descriptions

LICAL-ENC-MS001

D6

D7

SEL_BAUD0

SEL_BAUD1

GND

GND

GND

TX_CNTL

DATA_OUT

MODE_IND

D5

D4

D3

D2

VCC

VCC

D1

D0

SEND

CREATE_ADDR

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20