HCS101 datasheet(3/20 Pages) MICROCHIP

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Preliminary

DS41115D-page 3

HCS101

2.0

DEVICE OPERATION

As shown in the typical application circuits in Figure 2-

1, the HCS101 is easy to use. It requires only the addi-

tion of buttons and RF circuitry for use as the transmit-

ter in your application. A description of each pin is given

in Table 2-1.

FIGURE 2-1:

TYPICAL CIRCUITS

TABLE 2-1:

PIN DESCRIPTIONS

The HCS101 will wake-up upon detecting a switch clo-

sure and then delay for a debounce delay (TDB) as

shown in Figure 2-2. The device will then update the

16-bit counter before it loads the transmit register. The

data is then transmitted serially on the DATA pin in

Pulse Width Modulation (PWM) format.

If additional buttons are pressed during a transmission,

the current transmission is terminated. The HCS101

restarts and the new transmission will contain the latest

button information. When all buttons are released, the

device completes the current code word and then pow-

ers down. Released buttons do not terminate and/or

restart transmissions.

FIGURE 2-2:

ENCODER OPERATION

Name

Number

Description

Switch input 0

Switch input 1

Switch input 2/Clock pin for

Programming mode

No connection

VSS

Ground reference connection

DATA

Pulse Width Modulation (PWM)

output pin/Data pin for

Programming mode

No connection

VDD

Positive supply voltage connection

VDD

Tx out

VDD

DATA

VSS

2 button remote control

Tx out

VDD

DATA

VSS

4 button remote control

B3 B2 B1 B0

Note:

Up to 7 functions can be implemented

by pressing more than one button

simultaneously or by using a suitable

diode array.

VDD

Power-Up

RESET and Debounce Delay

Sample Inputs

Update Counter

Load Transmit Register

Buttons

Added

All

Buttons

Released

(A button has been pressed)

Transmit

Stop

Yes

Complete Code

Word Transmission

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