HCS365 datasheet(6/34 Pages) MICROCHIP

6 / 34 page

HCS365

DS41109D-page 6

Preliminary

The HCS365 has an onboard nonvolatile EEPROM.

This EEPROM is used to store user programmable

data and the synchronization counter. The data is pro-

grammed at the time of production and includes the

security related information such as encoder keys,

serial numbers, discrimination values, and seed val-

ues. All the security related options are read protected.

The initial counter value is also programmed at the time

of production. From then on the device maintains the

counter itself. The HCS365 has built in redundancy for

protection and can recover from counter corruption.

The counter will not increment if the previous write was

corrupted by low voltage RESET or power failure dur-

ing TPLL. Instead, the counter will revert back to the

previous count and the HCS370 will attempt to correct

the bad bits. This will continue on every button press

until the voltage increases and the counter is success-

fully corrected.

FIGURE 2-1:

TYPICAL CIRCUITS

VDD

RFEN

LED

VDD

DATA

VSS

Three buttons remote with PLL control

VDD

Tx out

LED

VDD

DATA

VSS

Five buttons remote control (Note)

B4 B3 B2 B1 B0

Note:

Up to 15 functions can be implemented by

pressing more than one button simulta-

neously or by using a suitable diode array.

VDD

Tx out

SHIFT

LED

VDD

DATA

VSS

B1 B0

Tx1

Tx2

DUAL Transmitter remote control

RF PLL

DATA IN

ENABLE

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