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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-

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

Pin

Number

Description

S0

1

Switch input 0

S1

2

Switch input 1

S2

3

Switch input 2/Clock pin for

Programming mode

NC

4

No connection

5

Ground reference connection

DATA

6

Pulse Width Modulation (PWM)

output pin/Data pin for

Programming mode

NC

7

No connection

8

Positive supply voltage connection

B0

Tx out

S0

S1

S2

NC

NC

DATA

2 button remote control

B1

Tx out

S0

S1

S2

NC

DATA

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.

NC

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

No

Yes

No

Yes

Complete Code

Word Transmission