RFHCS362F datasheet(18/60 Pages) MICROCHIP

18 / 60 page

rfHCS362G/362F

DS41189A-page 18

Preliminary

3.2

LED Output

The LED pin will be driven LOW periodically while the

rfHCS362 is transmitting data to power 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)

3.3

Dual Encoder Operation

The rfHCS362G/362F contains two encryption keys

(for example derived from two different Manufacturer’s

Codes), but only one Serial Number, one set of Dis-

crimination bits, one 16-bit Synchronization Counter

and a single 60-bit Seed value. For this reason the

rfHCS362G/362F can be used as an encoder in multi-

ple (two) applications as far as they share the same

configuration: transmission format, baud rate, header

and guard settings. The SHIFT input pin (multiplexed

with the LED output) is used to select between the two

encryption keys.

A logic 1 on the SHIFT input pin selects the first encryp-

tion key.

A logic 0 on the SHIFT input pin will select the second

encryption key.

FIGURE 3-9:

USING DUAL ENCODER

OPERATION

Note:

When the rfHCS362 encoder is used

as a Dual Encoder the LED pin is used

as a SHIFT input (Figure 3-9). 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.

S[3210]

LED

VDD > VLOW

TLEDON = 25 ms

TLEDOFF

LED

VDD < VLOW

TLEDON

TLEDOFF = 500 ms

LED

VDD < VLOW

S[3210]

LED

VDD > VLOW

TLEDON

TLEDOFF

TLEDON = 200 ms

TLEDOFF = 800 ms

VDD

DATA

VSS

SHIFT

1 k

Ω

LED/SHIFT

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