HCS473-I/SL Microchip Technology, HCS473-I/SL Datasheet - Page 24

• 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

HCS473
3.2.2.4
The transponder reader follows the HCS473’s Field
Acknowledge by sending the desired 3-bit command,
3-bit option or address, associated data and CRC;
each as required. LF commands are Pulse Position
Modulated (PPM) as shown in Figure 3-10. The last bit
(CRC bit) should be followed by leaving the field on for
T
FIGURE 3-11:
DS40035C-page 22
Response
FINH
SKIPACK = 0 - Field Acknowledge sent when device wakes
SKIPACK = 1 - Field Acknowledge is not sent
Inductive
Inductive
Communication from reader to HCS473
Communication from HCS473 to reader
125kHz Field
(on LC pins)
(DATA)
(LC)
(LC)
RF
.
Command Sequence
HCS473 TRANSPONDER WAKE-UP SEQUENCE
T
SF
Simultaneous LF
Acknowledge
3LF
3LF
RF Acknowledge
(LFRSP=1)
(RFRSP=1)
TE
TE
3LF
TE
3LF
TE
Preliminary
T
T
CMD
SF
MAX
Command
T
secutive
Section 3.2.4 and Section 3.2.5 for LF response and
consecutive command considerations.
FINH
T
CMD
should be appropriately adjusted to receive con-
commands
 2002 Microchip Technology Inc.
or
LF
Command
responses.
T
CMD
See