RFHCS362GT-I/SO Microchip Technology, RFHCS362GT-I/SO Datasheet - Page 18

• Manufacturer Part Number: RFHCS362GT-I/SO
• Description: IC CODE HOPPNG ENCDR W/RF 18SOIC
• Manufacturer: Microchip Technology

Specifications of RFHCS362GT-I/SO

• Frequency: 310MHz ~ 440MHz
• Applications: Automotive, Building Access, Garage Openers
• Modulation Or Protocol: ASK, FSK
• Data Rate - Maximum: 3.3 kbps
• Power - Output: -12dBm ~ 2dBm
• Current - Transmitting: 11.5mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.2 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 18-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -

rfHCS362G/362F
3.2
The LED pin will be driven LOW periodically while the
rfHCS362 is transmitting data to power an external
LED.
The duty cycle (T
between two possible values by the configuration
option (LED).
FIGURE 3-7:
The same configuration option determines whether
when the V
trip point the LED will blink only once or stop blinking.
FIGURE 3-8:
DS41189A-page 18
V
V
V
V
S[3210]
DD
S[3210]
Note:
DD
DD
LED
DD
LED
LED
LED
> V
> V
< V
< V
LOW
LOW
LOW
LOW
LED Output
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. V
available when using the second
Encryption Key.
DD
T
LEDON
Voltage drops below the selected V
T
T
T
LEDON
LEDON
LEDON
LED OPERATION (LED = 0)
LED OPERATION (LED = 1)
LEDON
= 25 ms
= 200 ms
T
T
/T
LOW
LEDOFF
LEDOFF
LEDOFF
T
information is not
LEDOFF
T
LEDOFF
) can be selected
= 500 ms
= 800 ms
LOW
Preliminary
3.3
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:
Dual Encoder Operation
LED/SHIFT
OPERATION
USING DUAL ENCODER
DATA
V
V
DD
SS
2002 Microchip Technology Inc.
V
DD
1 k
SHIFT