HCS362 datasheet(12/46 Pages) MICROCHIP

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HCS362

DS40189E-page 12

3.1.4

MINIMUM CODE WORDS

MTX[0..1]

configuration bits selects the minimum

number of code words that will be transmitted. If the

button is released after 1.6 s (or greater) and MTX code

words have been transmitted, the code word being

transmitted will be terminated. The possible values are:

- 1

- 2

- 4

- 8

3.1.5

TIME BITS

The time bits indicate the duration that the inputs were

activated:

- immediate

- after 0.8 s

- after 1.6 s

- after 2.4 s

The TIME bits are incremented every 0.8 s and does

not wrap once it reaches ‘11’.

Time information is alternative to the CRC bits availabil-

ity and is selected by the CTSEL configuration bit.

FIGURE 3-6:

TIME BITS OPERATION

3.2

LED Output

The LED pin will be driven LOW periodically while the

HCS362 is transmitting data, in order to switch on an

external LED.

The duty cycle (TLEDON/TLEDOFF) can be selected

between two possible values by the configuration

option (LED).

FIGURE 3-7:

LED OPERATION (LED = 1)

The same configuration option determines whether

when the VDD Voltage drops below the selected VLOW

trip point, the LED will blink only once or stop blinking.

FIGURE 3-8:

LED OPERATION (LED = 0)

TTD

Time

DATA

= One Code Word

Time bits = 00

Time bits set internally to 01

Time bits actually output

Time bits set internally to 10

Time bits actually output

0 s

0.8 s

1.6 s

2.4 s

S[3210]

LED

VDD > VLOW

TLEDON = 25 ms

TLEDOFF

LED

VDD < VLOW

TLEDON

TLEDOFF = 500 ms

Note:

When the HCS362 encoder is used as

a Dual Encoder the LED pin is used as

a SHIFT input (Figure 2-2). In such a

configuration the LED is always ON

during transmission. To keep power

consumption low, it is recommended

to use a series resistor of relatively

high value. VLOW information is not

available when using the second

Encryption Key.

LED

VDD < VLOW

S[3210]

LED

VDD > VLOW

TLEDON

TLEDOFF

TLEDON = 200 ms

TLEDOFF = 800 ms

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