HCS473-I/SL Microchip Technology, HCS473-I/SL Datasheet - Page 31

• Manufacturer Part Number: HCS473-I/SL
• Description: IC KEELOQ 3AXIS TRANSCODR 14SOIC
• Manufacturer: Microchip Technology
• Series: KEELOQ®r
• Type: Code Hopping Encoder and Transponderr

Specifications of HCS473-I/SL

• Applications: Access Control Systems
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.2.3.6
The REQUEST HOPPING CODE command tells the
HCS473 to increment the synchronization counter and
build the 32-bit code hopping portion of the encoder
code word.
A delay of T
the counter (updating EEPROM values) and encrypts
the response.
RFRSP determines if the response will be transmitted
on the DATA pin. If enabled, the response will be a sin-
gle K
FIGURE 3-17:
 2002 Microchip Technology Inc.
Inductive In
RF Response
(DATA Pin)
(LC Pins)
Previous Command
EE
Wake Sequence
L
Response
OQ
or
HOP
REQUEST HOPPING CODE
COMMAND
T
code hopping code word, based on
SF
occurs while the HCS473 increments
ACK
REQUEST HOPPING CODE SEQUENCE (RF RESPONSE EXAMPLE)
T
CMD
T
CMD
Command
T
CMD
‘110
CMD
2
’
2 bits
CRC
CRC
Preliminary
T
FINH
T
HOP
T
HOP
Encoder mode options. The code word will contain a
button code of ‘0000
not result from a button press.
LFRSP determines if the response will be transmitted
on the LC pins. The LC pin response will be the 32-bit
hopping portion of the code word, modulated PPM for-
mat.
If both RFRSP and LFRSP are enabled, the HCS473
will send the response on the DATA pin immediately fol-
lowed by the PPM response on the LC pins. Refer to
Section 3.2.1.7 for further response path details.
The next command must begin T
hopping response.
LF must remain on if following
with consecutive command
or if waiting for LF response
RF Response (RFRSP=1)
RESPONSE
2
’, indicating the transmission did
T
CMD
HCS473
CMD
T
Optional Next
CMD
DS40035C-page 29
Command
after the code
Command
Next
T
CMD