HCS365 datasheet(5/34 Pages) MICROCHIP

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Preliminary

DS41109D-page 5

HCS365

2.0

DEVICE DESCRIPTION

As shown in the typical application circuits (Figure 2-1),

the HCS365 is an easy device to use. It requires only

the addition of buttons and RF circuitry for use as the

encoder in your security application. A description of

each pin is described in Table 2-1. Refer to Figure 2-2

for information on the I/O pins.

TABLE 2-1:

PIN DESCRIPTIONS

The HCS365 will normally be in a low power SLEEP

mode. When a button input is taken high, the device will

wake up, start the step-up regulator, and go through the

button debounce delay of TDB before the button code is

latched. In addition, the device will then read the con-

figuration options. Depending on the configuration

options and the button code, the device will determine

what the data and modulation format will be for the

transmission. The transmission will consist of a stream

of code words and will be transmitted TPU after the but-

ton is pressed for as long as the buttons are held down

or until a time-out occurs. The code word format can be

either a code hopping format or a seed format.

The time-out time can be selected with the Time-out

Select (TSEL) configuration option. This option allows

the time-out to be set to 0.8s, 3.2s, 12.8s, or 25.6s.

When a time-out occurs, the device will go into SLEEP

mode to protect the battery from draining when a button

gets stuck.

If the device is in the transmit process and detects that

a new button is pressed, the current code word will be

aborted, a new code word will be transmitted and the

time-out counter will RESET. If all the buttons are

released, a minimum number of code words will still be

completed. The minimum code words can be set to 1,

2, 4, or 8 using the Minimum Code Words (MTX) con-

figuration option. If the time for transmitting the mini-

mum code words is longer than the time-out time, the

device will not complete the minimum code words.

Note:

S0-S3 inputs have pull-down resistors. VIN

should be tied high if the step-up regulator

is not used.

Name

Number

Description

Switch input 0

Switch input 1

Switch input 2

S3/

SHIFT/

RFEN

Switch input 3,

SHIFT button or

RF Enable output

VSS

Ground reference

DATA

Data output pin/

LED

Open drain output for LED

VDD

Positive supply voltage

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