HCS370 datasheet(5/36 Pages) MICROCHIP

5 / 36 page

2002 Microchip Technology Inc.

Preliminary

DS41111D-page 5

HCS370

2.0

DEVICE DESCRIPTION

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

the HCS370 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 2-3

for information on the I/O pins.

TABLE 2-1:

PIN DESCRIPTIONS

The HCS370 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 configuration options. Depending on the configura-

tion options and the button code, the device will deter-

mine 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 button 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. This option must be chosen to meet maxi-

mum transmission length regulatory limits which vary

by country.

FIGURE 2-1:

TYPICAL CIRCUITS

Note:

S0-S5 and SHIFT inputs have pull-down

resistors. VIN should be tied high if the

step-up regulator is not used.

Name

Number

Description

Switch input S0

Switch input S1

Switch input S2

Switch input S3

Switch input S4

S5/SLEEP

Switch input S5, or SLEEP

output

SHIFT

SHIFT input

VIN

Step-up regulator input

STEP

Step-up pulses output

RFEN

RF enable output

VSS

Ground reference

DATA

Transmission output pin

LED

Open drain output for LED

with pull-up resistor

VDD

Positive supply voltage

VDD

Tx out

Six Button remote with PLL control

LED

VDD

DATA

VSS

SHIFT

RFEN

STEP

VIN

DATA

SHIFT

Figure 2-1(A)

RLED

RF PLL

DATA IN

ENABLE

VDD

2.05-5.5V

Tx out

Two Button remote with Step-up circuit

LED

VDD

DATA

VSS

SLEEP

SHIFT

RFEN

STEP

VIN

DATA

SHIFT

33k

Ω

10k

Ω

Figure 2-1(B)

2.2 k

Ω

330

µH

1N4148

COUT

2N3904

6V@1 mA

Note: Using SLEEP output low instead of grounding the resistor

divider reduces battery drain between transmissions

VDD

Tx out

Tx1

Tx2

DUAL Transmitter remote control

LED

VDD

DATA

VSS

SHIFT

RFEN

STEP

VIN

DATA

SHIFT

Figure 2-1(C)

RLED

VDD

µF

1000 pF

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