HCS410/WM Microchip Technology, HCS410/WM Datasheet - Page 7

• 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: -

4.0
The HCS410/WM has nonvolatile EEPROM memory
which is used to store user programmable options. This
information includes encoder keys, serial number, and
up to 64-bits of user information.
4.1
Upon receiving a programming opcode and the trans-
port code, the EEPROM is erased. Thereafter, the first
16 bits of data can be written. After indicating that a
write command has been successfully completed the
device is ready to receive the next 16 bits. After a com-
plete memory map was received, it will be transmitted
in PPM format on the LC pins as 16-bit words.
After the EEPROM is erased, the configuration word is
reloaded. This results in oscillator tuning bits of 0000
being used during programming. When using IFF pro-
gramming, the user should read the configuration word
and store the oscillator bits in the memory map to be
programmed. A program command should be sent and
the next set of ACK pulses transmitted by the HCS410/
WM should be used to determine the T
gram command can then be sent, and the device pro-
grammed using the T
4.2
In IFF operation, the HCS410/WM uses encoder key1
or key2 to generate the response to a challenge
received. The key or keys are created and pro-
grammed at the time of production using a key genera-
tion algorithm. Inputs to the key generation algorithm
are the serial number and a secret manufacturer’s
code. While a number of key generation algorithms are
supplied by Microchip, a user may elect to create their
own method of key generation. This may be done pro-
viding that the decoder is programmed with the same
means of creating the key for decryption purposes.
4.3
The least significant 32-bits of key2 are used as the
transport code. The transport code is used to write-pro-
tect the serial number, configuration word and prevent
accidental programming of the HCS410/WM.
4.4
There are 32 bits allocated for the serial number. The
serial number is meant to be unique for every transmit-
ter. The serial number can be programmed with a write
command.
4.5
The 64-bit user EEPROM can be reprogrammed and
read at any time using the IFF interface.
2001 Microchip Technology Inc.
EEPROM ORGANIZATION AND
CONFIGURATION
IFF Programming
Encoder Key 1 and 2
Transport Code
Serial Number
User Data
E
just calibrated.
E
. A second pro-
Preliminary
4.6
The configuration data is used to select various
encoder options. Further explanations of each of the
bits are described in the following sections.
TABLE 4-1:
4.6.1
If IDAMP is set to ‘1’ intelligent damping is disabled.
4.6.2
4.6.3
These bits allow the onboard oscillator to be tuned to
within 10% of the nominal oscillator speed over both
temperature and voltage.
TABLE 4-2:
4.6.4
This selects the baud rate for IFF communications for
a T
4.6.5
If ACOLI is set, the anti-collision operation during bidi-
rectional transponder mode (IFF) is enabled. This fea-
ture is useful in situations where multiple transponders
enter the magnetic field simultaneously.
Symbol
OSC0:3
IDAMP
ACOLI
E
1000
1001
1010
0000
0001
0010
IFF2
IFFB
OSC
0110
0111
1111
of 200 s.
•
•
•
•
•
•
Configuration Data
IDAMP: INTELLIGENT DAMPING
IFF2: ENABLE IFF2 KEY
OSC: OSCILLATOR TUNING BITS
IFFB: TRANSPONDER BAUD RATE
ACOLI: ANTI-COLLISION
Intelligent Damping for High Q LC Tank.
Enable IFF2 key
Onboard Oscillator Tuning Bits
Transponder Baud Rate
Anti Collision Communication Enable
OSCILLATOR TUNING
CONFIGURATION OPTIONS
HCS410/WM
Description
Description
Nominal
Slowest
Fastest
Slower
Faster
DS41116B-page 7