HCS200-SLASHP datasheet(5/34 Pages) MICROCHIP

5 / 34 page

DS40138D-page 5

HCS200

2.0

ENCODER OPERATION

As shown in Figure 2-1, the HCS200 is a simple device

to use. It requires only the addition of buttons and RF

circuitry for use as the transmitter in your security appli-

cation. A description of each pin is described in

Table 2-1.

FIGURE 2-1:

TYPICAL CIRCUITS

TABLE 2-1:

PIN DESCRIPTIONS

The HCS200 will wake-up upon detecting a button

press and delay approximately 10 ms for button

debounce (Figure 2-2). The synchronization counter,

discrimination value and button information will be

encrypted to form the hopping code. The hopping code

portion will change every transmission, even if the

same button is pushed again. A code word that has

been transmitted will not repeat for more than 64K

transmissions. This provides more than 18 years of use

before a code is repeated; based on 10 operations per

day. Overflow information sent from the encoder can be

used to extend the number of unique transmissions to

more than 192K.

If in the transmit process it is detected that a new but-

ton(s) has been pressed, a RESET will immediately

occur and the current code word will not be completed.

Please note that buttons removed will not have any

effect on the code word unless no buttons remain

pressed; in which case the code word will be completed

and the power-down will occur.

FIGURE 2-2:

ENCODER OPERATION

Note:

When VDD > 9.0V and driving low capaci-

tive loads, a resistor with a minimum value

of 50

Ω should be used in line with VDD.

This prevents clamping of PWM at 9.0V in

the event of PWM overshoot.

Name

Number

Description

Switch input 0

Switch input 1

Switch input 2/Clock pin when in

Programming mode

VSS

Ground reference

PWM

Pulse Width Modulation (PWM)

output pin/Data pin for Program-

ming mode

VDD

Positive supply voltage

Tx out

VDD

PWM

Vss

2 button remote control

Tx out

VDD

PWM

Vss

4 button remote control (Note1)

B3 B2 B1 B0

+12V

R (Note2)

+12V

R (Note 2)

Note

1: Up to 7 functions can be implemented by pressing

more than one button simultaneously or by using a

suitable diode array.

2: Resistor (R) is recommended for current limiting.

Power-Up

RESET and Debounce Delay

(10 ms)

Sample Inputs

Update Sync Info

Encrypt With

Load Transmit Register

Buttons

Added

All

Buttons

Released

(A button has been pressed)

Transmit

Stop

Yes

Crypt Key

Complete Code

Word Transmission

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