HCS410/WM Microchip Technology, HCS410/WM Datasheet - Page 6

• Manufacturer Part Number: HCS410/WM
• Description: IC CODE HOPPING ENCODER SMD
• Manufacturer: Microchip Technology
• Series: KEELOQ®r
• Type: Code Hopping Encoder and Transponderr

Specifications of HCS410/WM

• Applications: Access Control Systems
• Package / Case: *
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification
• Mounting Type: -

HCS410/WM
3.7
3.7.1
When the ACOLI bit is set in the configuration word,
anti-collision mode is entered. The HCS410/WM will
start sending ACK pulses when it enters a magnetic
field. The ACK pulses stop as soon as the HCS410/
WM detects a start bit from the decoder. A ‘select
encoder’ opcode (00000) is then sent out by the
decoder, followed by a 32-bit serial number. If the serial
number matches the HCS410/WM’s serial number, the
HCS410/WM will acknowledge with the acknowledge
sequence as shown in Figure 3-4. The HCS410/WM
can then be addressed as normal. If the serial number
does not match, the IFF encoder will stop transmitting
ACK pulses until it is either removed from the field or
the correct serial number is given.
FIGURE 3-4:
3.7.2
If the IDAMP bit is set to 0, the HCS410/WM will clamp
the LC pins for 5 µs every 1/4 T
HCS410/WM is expecting data from the decoder. The
intelligent damping pulses start 64 T
acknowledge pulses have been sent and continue for
64 T
while sending out damp pulses, the damp pulses will
continue to be sent. The damping will help the LC cir-
cuit resonance decay faster when the field is removed.
This can make high to low data field decay sharper.
DS41116B-page 6
LC0/1
E
. If the HSC410 detects data from the base station
IFF Special Features
ANTI-COLLISION (ACOLI)
INTELLIGENT DAMPING
T
E
T
E
SERIAL NUMBER CORRECT
ACKNOWLEDGE SEQUENCE
3 T
E
3 T
E
, whenever the
E
E
after the
Preliminary
2001 Microchip Technology Inc.