RFHCS362GT-I/SO Microchip Technology, RFHCS362GT-I/SO Datasheet - Page 19

• 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: -

FIGURE 3-10: SEED CODE WORD FORMAT
3.4
A seed transmission transmits a unencrypted code
word that consists of 60 bits of fixed data that is stored
in the EEPROM. This can be used for secure learning
of encoders or whenever a fixed code transmission is
required. The seed code word further contains the
function code and the status information (V
and QUEUE) as configured for normal code hopping
code words. The seed code word format is shown in
Figure 3-10. The function code for seed code words is
always ‘
Seed code words can be configured as follows:
• Enabled permanently.
• Disabled permanently.
• Enabled until the synchronization counter is
• The time before the seed code word is transmitted
3.4.1
The button combination (
Seed code word can be selected with the Seed and
SeedC (
options as shown in Table 3-1 and Table 3-2:
greater than 7Fh, this configuration is often
referred to as Limited Seed.
can be set to 1.6 s or 3.2 s, this configuration is
often referred to as Delayed Seed. When this
option is selected, the rfHCS362 will transmit a
code hopping code word for 1.6 s or 3.2 s, before
the seed code word is transmitted.
2002 Microchip Technology Inc.
With QUEN = 1
Q1 Q0 C1 C0
(2 bits)
QUE
1111b
Seed Code Word Data Format
SEED
(2 bits)
SEED OPTIONS
CRC
Fixed Portion
’.
[
(9 bits)
0..1
(1-bit)
V
LOW
] and
1
S[3210]
(4 bits)
1
BUT
SEEDC
1
1
) for transmitting a
) configuration
LOW
, CRC
Preliminary
TABLE 3-1:
TABLE 3-2:
Example A): Selecting
makes SEED transmission available every time the
combination of buttons S3 and S0 is pressed simulta-
neously, but Delayed Seed mode is not available.
Example B): Selecting
makes SEED transmission available only for a limited
time (only up to 128 times). The combination of buttons
S2 and S0 produces an immediate transmission of the
SEED code. Pressing and holding for more than 1.6
seconds the S0 button alone produces the SEED code
word transmission (Delayed Seed).
SEED
SEED
Note:
Note:
00
01
10
11
00
01
10
11
SEED Code
(60 bits)
SEED
rfHCS362G/362F
*Limited Seed
*Limited Seed
S[3210]
S[3210]
0101*
1001*
0101
0101
1001
1001
SEED OPTIONS (SEEDC = 0)
Seed
SEED OPTIONS (SEEDC = 1)
Seed
Transmission Direction LSB First
-
-
SEEDC = 0
SEEDC = 1
1.6 s Delayed Seed
3.2 s Delayed Seed
DS41189A-page 19
and
and
S[3210]
S[3210]
0001*
0011*
0001
0011
SEED = 11
SEED = 01
-
-
-
-
:
: