HCS515-I/P Microchip Technology, HCS515-I/P Datasheet - Page 13

• Manufacturer Part Number: HCS515-I/P
• Description: IC,Remote-Control Receiver/Decoder,CMOS,DIP,14PIN
• Manufacturer: Microchip Technology
• Type: Code Hopping Decoderr

Specifications of HCS515-I/P

• Applications: Remote Secure Access, Keyless Entry
• Mounting Type: Through Hole
• Package / Case: 14-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

FIGURE 4-8:
FIGURE 4-9:
4.3
The HCS515 decoder can also be used in stand-alone
applications. The HCS515 will activate the data line for
up to 500 ms if a valid transmission was received, and
this output can be used to drive a relay circuit. To acti-
vate learn or erase all commands, a button must be
connected to the CLK input. User feedback is indicated
on an LED connected to the
CLK line is pulled high, using the learn button, the LED
will switch on. After the CLK line is kept high for longer
than 2 seconds, the decoder will switch the LED line off,
indicating that learn will be entered if the button is
released. If the CLK line is kept high for another 6 sec-
onds, the decoder will activate an
mand.
Learn mode can be aborted by taking the clock line
high until the data line goes high (LED switches on).
During learn, the data line will give feedback to the user
and, therefore, must not be connected to the relay drive
circuitry.
After taking the clock low and before a transmitter is
learned, any low-to-high change on the clock line may
terminate learn. This has learn implications when a
switch with contact bounce is used.
CLK
Decoder
DATA
Note:
2002 Microchip Technology Inc.
A
Stand-Alone Mode
T
CLA
The Repeat bit must be cleared in the
configuration
mode.
Communications Request
T
DHI
LEARN STATUS MESSAGE AFTER FIRST TRANSMISSION
LEARN STATUS MESSAGE AFTER SECOND TRANSMISSION
T
ACT
Decoder
Data
byte
T
T
CLL
CLH
CLK
S_DAT
B
0
T
A
in
CLKL
T
ERASE_ALL
CLA
OVR RSLT
output line. If the
Command Request
Stand-alone
T
DHI
T
ACT
0
com-
T
0
CLKH
T
T
CLL
CLH
Learn Status Bits
0
B
0
0
T
0
CLKL
1
4.4
The Table 4-3 describes two versions of the Erase All
command.
TABLE 4-3:
Subcommand 01 can be used where a transmitter with
permanent status is implemented in the microcontroller
software. Use of subcommand
permanent transmitter remains in memory even when
all other transmitters are erased. The first transmitter
learned after any of the following events is the first
transmitter in memory and becomes the permanent
transmitter:
1.
2.
Command
CNT0
0
C3
C3
Programming of the manufacturer’s code.
Erasing of all transmitters
(subcommand
Byte
Status Byte
0
HEX
HEX
Erase All Command and Erase
Command
T
CNT3
0
CLKH
TX0
0
Subcommand
ERASE ALL COMMAND
00
0
00
01
Byte
TX3
only).
HEX
HEX
0
C
C
RX0
I
RX1
01
HCS515
Decoded T
Erase all
transmitters.
Erase all transmit-
ters except 1. The
first transmitter in
memory is not
erased.
DS40183D-page 13
ensures that the
Description
RX62
X
RX63
C
II