HCS515 datasheet(14/32 Pages) MICROCHIP

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HCS515

DS40183D-page 14

4.5

Test Mode

A special Test mode is activated after:

Programming of the manufacturer’s code.

Erasing of all transmitters.

Test mode can be used to test a decoder before any

transmitters are learned on it. Test mode enables test-

ing of decoders without spending the time to learn a

transmitter. Test mode is terminated after the first suc-

cessful learning of an ordinary transmitter. In test

mode, the decoder responds to a test transmitter. The

test transmitter has the following properties:

Encoder decryption key = manufacturer’s code.

Serial number = any value.

Discrimination bits = lower 10 bits of the serial

number.

Synchronization counter value = any value

(synchronization information is ignored).

Because the synchronization counter value is ignored

in Test mode, any number of test transmitters can be

used, even if their synchronization counter values are

different.

4.6

Power Supply Supervisor

Reliable operation of the HCS515 requires that the

contents of the EEPROM memory be protected against

erroneous writes. To ensure that erroneous writes do

not occur after supply voltage “brown-out” conditions,

the use of a proper power supply supervisor device is

imperative (Figure 4-11 and Figure 8-2).

FIGURE 4-10: STAND-ALONE MODE LEARN/ERASE-ALL TIMING

FIGURE 4-11: TYPICAL STAND-ALONE APPLICATION CIRCUIT

DATA

Erase-All Activation

TREQ

TLRN

CLK

Learn Activation

TERA

Successful

TLRN

OUTPUT0

RELAY SPST

VDD

LEARN

NPN

LED

10K

Ω

VDD

GND

RST

MCP100-450

Voltage Supervisor

VDD

MCLR

VSS

RF_IN

S_CLK

S_DAT

10K

Ω

VDD

10K

Ω

from RF Receiver

HCS515

OUTPUT1

RELAY SPST

VDD

NPN

10K

Ω

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