MICROCHIP HCS320

HCS320
KEELOQ® Code Hopping Encoder
FEATURES
DESCRIPTION
Security
The HCS320 from Microchip Technology Inc. is a code
hopping encoder designed for secure Remote Keyless
Entry (RKE) systems. The HCS320 utilizes the code
hopping technology which incorporates high security, a
small package outline, and low cost, to make this
device a perfect solution for unidirectional remote keyless entry systems and access control systems.
•
•
•
•
•
•
Programmable 28-bit serial number
Programmable 64-bit encryption key
Each transmission is unique
66-bit transmission code length
32-bit hopping code
34-bit fixed code (28-bit serial number,
4-bit function code, 2-bit status)
• Encryption keys are read protected
PACKAGE TYPES
PDIP, SOIC
S0
1
•
•
•
•
•
•
•
•
S1
2
S2
3
SHIFT
4
3.5V - 13.0V operation
Shift key and three inputs
16 functions available
Selectable baud rate
Automatic code word completion
Battery low signal transmitted to receiver
Battery low indication on LED
Non-volatile synchronization data
HCS320
Operating
8
VDD
7
LED
6
PWM
5
VSS
HCS320 BLOCK DIAGRAM
Oscillator
RESET circuit
Other
Power
latching
and
switching
Controller
LED
•
•
•
•
•
•
Easy-to-use programming interface
On-chip EEPROM
On-chip oscillator and timing components
Button inputs have internal pull-down resistors
Current limiting on LED output
Low external component cost
LED driver
EEPROM
PWM
Encoder
32-bit shift register
Typical Applications
VSS
The HCS320 is ideal for Remote Keyless Entry (RKE)
applications. These applications include:
•
•
•
•
•
•
Automotive RKE systems
Automotive alarm systems
Automotive immobilizers
Gate and garage door openers
Identity tokens
Burglar alarm systems
 2001 Microchip Technology Inc.
Button input port
VDD
SHIFT S2
S1 S0
The HCS320 combines a 32-bit hopping code generated by a nonlinear encryption algorithm, with a 28-bit
serial number and six status bits to create a 66-bit
transmission stream. The length of the transmission
eliminates the threat of code scanning and the code
hopping mechanism makes each transmission unique,
thus rendering code capture and resend (code grabbing) schemes useless.
DS41097C-page 1
HCS320
The crypt key, serial number and configuration data are
stored in an EEPROM array which is not accessible via
any external connection. The EEPROM data is programmable but read-protected. The data can be verified only after an automatic erase and programming
operation. This protects against attempts to gain
access to keys or manipulate synchronization values.
The HCS320 provides an easy-to-use serial interface
for programming the necessary keys, system parameters and configuration data.
1.0
SYSTEM OVERVIEW
Key Terms
The following is a list of key terms used throughout this
data sheet. For additional information on KEELOQ and
Code Hopping, refer to Technical Brief 3 (TB003).
• RKE - Remote Keyless Entry
• Button Status - Indicates what button input(s)
activated the transmission. Encompasses the 4
button status bits S3, S2, S1 and S0 (Figure 4-2).
• Code Hopping - A method by which a code,
viewed externally to the system, appears to
change unpredictably each time it is transmitted.
• Code word - A block of data that is repeatedly
transmitted upon button activation (Figure 4-1).
• Transmission - A data stream consisting of
repeating code words (Figure 8-2).
• Crypt key - A unique and secret 64-bit number
used to encrypt and decrypt data. In a symmetrical block cipher such as the KEELOQ algorithm,
the encryption and decryption keys are equal and
will therefore be referred to generally as the crypt
key.
• Encoder - A device that generates and encodes
data.
• Encryption Algorithm - A recipe whereby data is
scrambled using a crypt key. The data can only be
interpreted by the respective decryption algorithm
using the same crypt key.
• Decoder - A device that decodes data received
from an encoder.
• Decryption algorithm - A recipe whereby data
scrambled by an encryption algorithm can be
unscrambled using the same crypt key.
• Learn – Learning involves the receiver calculating
the transmitter’s appropriate crypt key, decrypting
the received hopping code and storing the serial
number, synchronization counter value and crypt
key in EEPROM. The KEELOQ product family facilitates several learning strategies to be implemented on the decoder. The following are
examples of what can be done.
- Simple Learning
The receiver uses a fixed crypt key, common
to all components of all systems by the same
manufacturer, to decrypt the received code
word’s encrypted portion.
- Normal Learning
The receiver uses information transmitted
during normal operation to derive the crypt
key and decrypt the received code word’s
encrypted portion.
- Secure Learn
The transmitter is activated through a special
button combination to transmit a stored 60-bit
seed value used to generate the transmitter’s
crypt key. The receiver uses this seed value
to derive the same crypt key and decrypt the
received code word’s encrypted portion.
• Manufacturer’s code – A unique and secret 64bit number used to generate unique encoder crypt
keys. Each encoder is programmed with a crypt
key that is a function of the manufacturer’s code.
Each decoder is programmed with the manufacturer code itself.
The HCS320 code hopping encoder is designed specifically for keyless entry systems; primarily vehicles and
home garage door openers. The encoder portion of a
keyless entry system is integrated into a transmitter,
carried by the user and operated to gain access to a
vehicle or restricted area. The HCS320 is meant to be
a cost-effective yet secure solution to such systems,
requiring very few external components (Figure 2-1).
Most low-end keyless entry transmitters are given a
fixed identification code that is transmitted every time a
button is pushed. The number of unique identification
codes in a low-end system is usually a relatively small
number. These shortcomings provide an opportunity
for a sophisticated thief to create a device that ‘grabs’
a transmission and retransmits it later, or a device that
quickly ‘scans’ all possible identification codes until the
correct one is found.
The HCS320 on the other hand, employs the KEELOQ
code hopping technology coupled with a transmission
length of 66 bits to virtually eliminate the use of code
‘grabbing’ or code ‘scanning’. The high security level of
the HCS320 is based on the patented KEELOQ technology. A block cipher based on a block length of 32 bits
and a key length of 64 bits is used. The algorithm
obscures the information in such a way that even if the
transmission information (before coding) differs by only
one bit from that of the previous transmission, the next
DS41097C-page 2
 2001 Microchip Technology Inc.
HCS320
coded transmission will be completely different. Statistically, if only one bit in the 32-bit string of information
changes, greater than 50 percent of the coded transmission bits will change.
As indicated in the block diagram on page one, the
HCS320 has a small EEPROM array which must be
loaded with several parameters before use; most often
programmed by the manufacturer at the time of production. The most important of these are:
The crypt key generation typically inputs the transmitter
serial number and 64-bit manufacturer’s code into the
key generation algorithm (Figure 1-1). The manufacturer’s code is chosen by the system manufacturer and
must be carefully controlled as it is a pivotal part of the
overall system security.
• A 28-bit serial number, typically unique for every
encoder
• A crypt key
• An initial 16-bit synchronization value
• A 16-bit configuration value
FIGURE 1-1:
CREATION AND STORAGE OF CRYPT KEY DURING PRODUCTION
Production
Programmer
HCS320
Transmitter
Serial Number
EEPROM Array
Serial Number
Crypt Key
Sync Counter
Manufacturer’s
Code
Key
Generation
Algorithm
The 16-bit synchronization counter is the basis behind
the transmitted code word changing for each transmission; it increments each time a button is pressed. Due
to the code hopping algorithm’s complexity, each increment of the synchronization value results in greater
than 50% of the bits changing in the transmitted code
word.
Figure 1-2 shows how the key values in EEPROM are
used in the encoder. Once the encoder detects a button
press, it reads the button inputs and updates the synchronization counter. The synchronization counter and
crypt key are input to the encryption algorithm and the
output is 32 bits of encrypted information. This data will
change with every button press, its value appearing
externally to ‘randomly hop around’, hence it is referred
to as the hopping portion of the code word. The 32-bit
hopping code is combined with the button information
and serial number to form the code word transmitted to
the receiver. The code word format is explained in
greater detail in Section 4.0.
Crypt
Key
.
.
.
A transmitter must first be ‘learned’ by the receiver
before its use is allowed in the system. Learning
includes calculating the transmitter’s appropriate crypt
key, decrypting the received hopping code and storing
the serial number, synchronization counter value and
crypt key in EEPROM.
In normal operation, each received message of valid
format is evaluated. The serial number is used to determine if it is from a learned transmitter. If from a learned
transmitter, the message is decrypted and the synchronization counter is verified. Finally, the button status is
checked to see what operation is requested. Figure 13 shows the relationship between some of the values
stored by the receiver and the values received from the
transmitter.
A receiver may use any type of controller as a decoder,
but it is typically a microcontroller with compatible firmware that allows the decoder to operate in conjunction
with an HCS320 based transmitter. Section 7.0
provides detail on integrating the HCS320 into a system.
 2001 Microchip Technology Inc.
DS41097C-page 3
HCS320
FIGURE 1-2:
BUILDING THE TRANSMITTED CODE WORD (ENCODER)
EEPROM Array
KEELOQ
Encryption
Algorithm
Crypt Key
Sync Counter
Serial Number
Button Press
Information
Serial Number
32 Bits
Encrypted Data
Transmitted Information
FIGURE 1-3:
BASIC OPERATION OF RECEIVER (DECODER)
1 Received Information
EEPROM Array
Button Press
Information
Serial Number
2
32 Bits of
Encrypted Data
Manufacturer Code
Check for
Match
Serial Number
Sync Counter
Crypt Key
3
KEELOQ
Decryption
Algorithm
Decrypted
Synchronization
Counter
4
Check for
Match
Perform Function
5 Indicated by
button press
NOTE: Circled numbers indicate the order of execution.
DS41097C-page 4
 2001 Microchip Technology Inc.
HCS320
2.0
DEVICE OPERATION
TABLE 2-1:
As shown in the typical application circuits (Figure 2-1),
the HCS320 is a simple device to use. It requires only
the addition of buttons and RF circuitry for use as the
transmitter in your security application. A description of
each pin is described in Table 2-1.
FIGURE 2-1:
Pin
Number
S0
S1
S2
1
2
3
SHIFT
VSS
PWM
4
5
6
LED
VDD
7
8
TYPICAL CIRCUITS
+12V
R (2)
B0
S0
B1
S1
LED
S2
PWM
SHIFT
VDD
Tx out
VSS
2 button remote control
+12V
SHIFT
Name
R (2)
B3 B2 B1 B0
S0
VDD
S1
LED
S2
PWM
SHIFT
VSS
Tx out
5 button remote control(1)
Note 1: The full 16 function codes are
implemented using the shift button.
2: Resistor R is recommended for current
limiting.
 2001 Microchip Technology Inc.
PIN DESCRIPTIONS
Description
Switch input 0
Switch input 1
Switch input 2/Clock pin when in
Programming mode
Switch input for Shift
Ground reference
Pulse Width Modulation (PWM)
output pin / Data pin for
Programming mode
Cathode connection for LED
Positive supply voltage
The HCS320 will wake-up upon detecting a button
press and delay approximately 10 ms for button
debounce (Figure 2-2). The synchronization counter,
discrimination value and button information will be
encrypted to form the hopping code. The hopping code
portion will change every transmission, even if the
same button is pushed again. A code word that has
been transmitted will not repeat for more than 64K
transmissions. This provides more than 18 years of use
before a code is repeated; based on 10 operations per
day. Overflow information sent from the encoder can be
used to extend the number of unique transmissions to
more than 192K.
If in the transmit process it is detected that a new button(s) has been pressed, a RESET will immediately
occur and the current code word will not be completed.
Please note that buttons removed will not have any
effect on the code word unless no buttons remain
pressed; in which case the code word will be completed
and the power-down will occur.
DS41097C-page 5
HCS320
FIGURE 2-2:
ENCODER OPERATION
3.0
EEPROM MEMORY
ORGANIZATION
Power-Up
(Button pressed) Set TX:= OFF
The HCS320 contains 192 bits (12 x 16-bit words) of
EEPROM memory (Table 3-1). This EEPROM array is
used to store the encryption key information,
synchronization value, etc. Further descriptions of the
memory array is given in the following sections.
RESET and Debounce Delay
(10 ms)
Transmit
Button Pressed?
Yes
TABLE 3-1:
No
Increment Shift Level
Set TX:=ON
WORD
ADDRESS
MNEMONIC
0
KEY_0
64-bit encryption key
(word 0) LSb’s
1
KEY_1
64-bit encryption key
(word 1)
2
KEY_2
64-bit encryption key
(word 2)
3
KEY_3
64-bit encryption key
(word 3) MSb’s
4
SYNC
16-bit synchronization
value
Stop Transmit
Shift
Button Pressed?
EEPROM MEMORY MAP
No
Yes
Yes
TX=ON?
Yes
Update Sync Info
No
5
6
Encrypt With
Crypt Key
7
Load Transmit Register
Transmit
No
3.1
Yes
TX=ON?
Yes
Complete Code
Word Transmission
Stop
DS41097C-page 6
No
Device Serial Number
(word 0) LSb’s
SER_1(Note) Device Serial Number
(word 1) MSb’s
Not used
9
—
Not used
Note:
All
Buttons
Released?
SER_0
—
11
No
RESERVED Set to 0000H
8
10
Buttons
Added?
DESCRIPTION
RESERVED Set to 0000H
CONFIG
Configuration Word
The MSB of the serial number contains a
bit used to select the Auto-shutoff timer.
KEY_0 - KEY_3 (64-Bit Crypt Key)
The 64-bit crypt key is used to create the encrypted
message transmitted to the receiver. This key is calculated and programmed during production using a key
generation algorithm. The key generation algorithm
may be different from the KEELOQ algorithm. Inputs to
the key generation algorithm are typically the transmitter’s serial number and the 64-bit manufacturer’s code.
While the key generation algorithm supplied from
Microchip is the typical method used, a user may elect
to create their own method of key generation. This may
be done providing that the decoder is programmed with
the same means of creating the key for
decryption purposes.
 2001 Microchip Technology Inc.
HCS320
3.2
SYNC (Synchronization Counter)
This is the 16-bit synchronization value that is used to
create the hopping code for transmission. This value
will be changed after every transmission.
3.3
Reserved
Must be initialized to 0000H.
3.4
SER_0, SER_1
(Encoder Serial Number)
3.5
The Configuration Word is a 16-bit word stored in
EEPROM array that is used by the device to store information used during the encryption process, as well as
the status of option configurations. The following sections further explain these bits.
TABLE 3-2:
Bit Number
0
1
2
3
4
5
6
7
8
9
10
11
12
SER_0 and SER_1 are the lower and upper words of
the device serial number, respectively. Although there
are 32 bits allocated for the serial number, only the
lower order 28 bits are transmitted. The serial number
is meant to be unique for every transmitter. The Most
Significant bit of the serial number (Bit 31) is used to
turn the Auto-shutoff timer on or off.
3.4.1
AUTO-SHUTOFF TIMER ENABLE
The Most Significant bit of the serial number (Bit 31) is
used to turn the Auto-shutoff timer on or off. This timer
prevents the transmitter from draining the battery
should a button get stuck in the on position for a long
period of time. The time period is approximately
25 seconds, after which the device will go to the Timeout mode. When in the Time-out mode, the device will
stop transmitting, although since some circuits within
the device are still active, the current draw within the
Shutoff mode will be more than Standby mode. If the
Most Significant bit in the serial number is a one, then
the Auto-shutoff timer is enabled, and a zero in the
Most Significant bit will disable the timer. The length of
the timer is not selectable.
CONFIG (Configuration Word)
13
14
15
3.5.1
CONFIGURATION WORD
Bit Description
Discrimination Bit 0
Discrimination Bit 1
Discrimination Bit 2
Discrimination Bit 3
Discrimination Bit 4
Discrimination Bit 5
Discrimination Bit 6
Discrimination Bit 7
Discrimination Bit 8
Discrimination Bit 9
Overflow Bit 0 (OVR0)
Overflow Bit 1 (OVR1)
Low Voltage Trip Point Select
(VLOW SEL)
Baud rate Select Bit 0 (BSL0)
Baud rate Select Bit 1 (BSL1)
Reserved, set to 0
DISCRIMINATION VALUE
(DISC0 TO DISC9)
The discrimination value aids the post-decryption
check on the decoder end. It may be any value, but in
a typical system it will be programmed as the 10 Least
Significant bits of the serial number. Values other than
this must be separately stored by the receiver when a
transmitter is learned. The discrimination bits are part
of the information that form the encrypted portion of the
transmission (Figure 4-2). After the receiver has
decrypted a transmission, the discrimination bits are
checked against the receiver’s stored value to verify
that the decryption process was valid. If the discrimination value was programmed as the 10 LSb’s of the
serial number then it may merely be compared to the
respective bits of the received serial number; saving
EEPROM space.
3.5.2
OVERFLOW BITS (OVR0, OVR1)
The overflow bits are used to extend the number of
possible synchronization values. The synchronization
counter is 16 bits in length, yielding 65,536 values
before the cycle repeats. Under typical use of
10 operations a day, this will provide nearly 18 years of
use before a repeated value will be used. Should the
system designer conclude that is not adequate, then
the overflow bits can be utilized to extend the number
 2001 Microchip Technology Inc.
DS41097C-page 7
HCS320
of unique values. This can be done by programming
OVR0 and OVR1 to 1s at the time of production. The
encoder will automatically clear OVR0 the first time that
the synchronization value wraps from 0xFFFF to
0x0000 and clear OVR1 the second time the counter
wraps. Once cleared, OVR0 and OVR1 cannot be set
again, thereby creating a permanent record of the
counter overflow. This prevents fast cycling of 64K
counter. If the decoder system is programmed to track
the overflow bits, then the effective number of unique
synchronization values can be extended to 196,608.
3.5.4
3.5.3
FIGURE 3-1:
BAUD RATE SELECT BITS (BSL0,
BSL1)
BSL0 and BSL1 select the speed of transmission and
the code word blanking. Table 3-3 shows how the bits
are used to select the different baud rates and
Section 5.6 provides detailed explanation in code word
blanking.
LOW VOLTAGE TRIP POINT
SELECT
The low voltage trip point select bit is used to tell the
HCS320 what VDD level is being used. This information
will be used by the device to determine when to send
the voltage low signal to the receiver. When this bit is
set to a one, the VDD level is assumed to be operating
from a 9.0 volt or 12.0 volt VDD level. If the bit is set low,
then the VDD level is assumed to be 6.0 volts. Refer to
Figure 3-1 for voltage trip point.
VOLTAGE TRIP POINTS
BY CHARACTERIZATION)
Volts (V)
VLOW sel = 0
VLOW
5.5
5.0
Max
4.5
4.0
TABLE 3-3:
BAUD RATE SELECT
BSL1
BSL0
Basic Pulse
Element
Code Words
Transmitted
0
0
1
1
0
1
0
1
400 µs
200 µs
100 µs
100 µs
All
1 out of 2
1 out of 2
1 out of 4
3.5
3.0
Min
2.5
9.0
VLOW sel = 1
8.5
Max
8.0
7.5
7.0
Min
-40 -20
0
20
40
60
80 100
Temp (C)
DS41097C-page 8
 2001 Microchip Technology Inc.
HCS320
4.0
TRANSMITTED WORD
4.2
4.1
Code Word Format
The HCS320 transmits a 66-bit code word when a
button is pressed. The 66-bit word is constructed from
a Fixed Code portion and an Encrypted Code portion
(Figure 4-2).
The HCS320 code word is made up of several parts
(Figure 4-1). Each code word contains a 50% duty
cycle preamble, a header, 32 bits of encrypted data and
34 bits of fixed data followed by a guard period before
another code word can begin. Refer to Table 8-3 for
code word timing.
Code Word Organization
The 32 bits of Encrypted Data are generated from 4
button bits, 12 discrimination bits and the 16-bit sync
value. The encrypted portion alone provides up to four
billion changing code combinations.
The 34 bits of Fixed Code Data are made up of 2 status bits, 4 button bits and the 28-bit serial number. The
fixed and encrypted sections combined increase the
number of code combinations to 7.38 x 1019.
FIGURE 4-1:
CODE WORD FORMAT
TE TE TE
LOGIC ‘0’
LOGIC ‘1’
Bit
Period
50% Duty Cycle
Preamble
TP
FIGURE 4-2:
Header
TH
Encrypted Portion
of Transmission
THOP
MSb
Guard
Time
TG
CODE WORD ORGANIZATION
34 bits of Fixed Portion
Repeat VLOW
(1-bit) (1-bit)
Fixed Portion of
Transmission
TFIX
Function
Code
(4-bit)
 2001 Microchip Technology Inc.
Serial Number
(28 bits)
32 bits of Encrypted Portion
Function
Code
(4-bit)
OVR
(2 bits)
DISC
(10 bits)
Sync Counter
(16 bits)
66 Data bits
Transmitted
LSb first.
LSb
DS41097C-page 9
HCS320
4.3
Synchronous Transmission Mode
Synchronous Transmission mode can be used to clock
the code word out using an external clock.
To enter Synchronous Transmission mode, the Programming mode start-up sequence must be executed
as shown in Figure 4-3. If either S1 or S0 is set on the
falling edge of S2, the device enters Synchronous
Transmission mode. In this mode, it functions as a normal transmitter, with the exception that the timing of the
PWM data string is controlled externally and 16 extra
bits are transmitted at the end with the code word.
FIGURE 4-3:
The button code will be the S0, S1 value at the falling
edge of S2. The timing of the PWM data string is controlled by supplying a clock on S2 and should not
exceed 20 kHz. The code word is the same as in PWM
mode with 16 reserved bits at the end of the word. The
reserved bits can be ignored. When in Synchronous
Transmission mode S2 should not be toggled until all
internal processing has been completed as shown in
Figure 4-4.
SYNCHRONOUS TRANSMISSION MODE
TPS TPH1 TPH2
t = 50ms
Preamble
Header
Data
PWM
S2
S[1:0]
FIGURE 4-4:
“01,10,11”
CODE WORD ORGANIZATION (SYNCHRONOUS TRANSMISSION MODE)
Fixed Portion
Reserved
(16 bits)
MSb
DS41097C-page 10
Padding
(2 bits)
Function
Code
(4-bit)
Encrypted Portion
Serial Number
(28 bits)
Function
Code
(4-bit)
DISC+ OVR
(12 bits)
Sync Counter
(16 bits)
82 Data bits
Transmitted
LSb first.
LSb
 2001 Microchip Technology Inc.
HCS320
5.0
SPECIAL FEATURES
5.3
5.1
Code Word Completion
The VLOW bit is transmitted with every transmission
(Figure 8-6) and will be transmitted as a one if the operating voltage has dropped below the low voltage trip
point. The trip point is selectable between two values,
based on the battery voltage being used. See
Section 3.5.4 for a description of how the low voltage
select option is set. This VLOW signal is transmitted so
the receiver can alert the user that the transmitter battery is low.
Code word completion is an automatic feature that
makes sure that the entire code word is transmitted,
even if the transmit button is released before the transmission is complete. The HCS320 encoder powers
itself up when a button is pushed and powers itself
down after the command is finished, if the user has
already released the button. If the button is held down
beyond the time for one transmission, then multiple
transmissions will result. If another button is activated
during a transmission, the active transmission will be
aborted and the function new code will be generated
using the new button information.
5.2
Note:
Auto-Shutoff
The Auto-shutoff function automatically stops the
device from transmitting if a button inadvertently gets
pressed for a long period of time. This will prevent the
device from draining the battery if a button gets
pressed while the transmitter is in a pocket or purse.
This function can be enabled or disabled and is
selected by setting or clearing the Auto-shutoff bit
(Section 3.4.1). Setting this bit high will enable the
function (turn Auto-shutoff function on) and setting the
bit low will disable the function. Time-out period is
dependent on the shift level and is approximately 42
±10 seconds.
FIGURE 5-1:
5.4
VLOW: Voltage LOW Indicator
Depending on the internal resistance of the
VDD source, VDD may normally be above
the VLOW trip point except when the LED is
turned on. In this case, the VLOW bit will be
transmitted as a one when a transmission
occurs while the LED is on. The VLOW bit
will be transmitted as a zero when a transmission occurs while the LED is off.
RPT: Repeat Indicator
This bit will be low for the first transmitted word. If a
button is held down for more than one transmitted code
word, this bit will be set to indicate a repeated code
word and remain set until the button is released.
5.5
LED Output Operation
During normal transmission the LED output (Figure 5-1)
indicates the shift level (Section 5.7) by flashing the
LED in a pattern corresponding to the shift level. If the
supply voltage drops below the low voltage trip point
(Section 3.5.4), the LED output will be toggled at
approximately 5 Hz during the transmission.
LED FLASH FUNCTION (EACH DIVISION - 180 MS)
SHIFT
LEVEL
LED OUTPUT
0
1
2
3
 2001 Microchip Technology Inc.
DS41097C-page 11
HCS320
5.6
Blank Alternate Code Word
Federal Communications Commission (FCC) part 15
rules specify the limits on fundamental power and
harmonics that can be transmitted. Power is calculated on the worst case average power transmitted in
a 100 ms window. It is therefore advantageous to
minimize the duty cycle of the transmitted word. This
can be achieved by minimizing the duty cycle of the
individual bits and by blanking out consecutive words.
Blank Alternate Code Word (BACW) is used for
reducing the average power of a transmission
FIGURE 5-2:
(Figure 5-1). This is a selectable feature that is determined in conjunction with the baud rate selection bits
BSL0 and BSL1. Using the BACW allows the user to
transmit a higher amplitude transmission if the transmission length is shorter. The FCC puts constraints on
the average power that can be transmitted by a
device, and BACW effectively prevents continuous
transmission by only allowing the transmission of
every second or every fourth code word. This reduces
the average power transmitted and hence, assists in
FCC approval of a transmitter device.
BLANK ALTERNATE CODE WORD (BACW)
Amplitude
BACW Disabled
(All words transmitted)
A
BACW Enabled
(1 out of 2 transmitted)
2A
BACW Enabled
(1 out of 4 transmitted)
Code Word
Code Word
Code Word
Code Word
4A
Time
DS41097C-page 12
 2001 Microchip Technology Inc.
HCS320
5.7
SHIFT Key Operation
TABLE 5-1:
The HCS320 has four switch inputs usually connected
to buttons as shown in Figure 2-1: Typical Circuits.
SHIFT
Any button connected to input S0, S1 or S2 is called a
TRANSMIT button as it causes a transmission when
pressed.
PIN ACTIVATION TABLE
S2
S1
S0
FUNCTION
CODE
0
0
0
0
No Transmission
0
0
0
1
0h
0
0
1
0
1h
0
0
1
1
2h
0
1
0
0
3h
1
0
0
0
No Transmission
1
0
0
1
4h
1
0
1
0
5h
1
0
1
1
6h
When a TRANSMIT button is pressed, the function
code transmitted for that button depends on the shift
level. The transmitted function code corresponding to
shift level and S0, S1 and S2 switch activation is shown
in Table 5-1 for all legal combinations of shift level and
button input. Note that a shift level of zero means that
the SHIFT button has not been pressed (or it has been
pressed four times). The shift level is reset to zero after
a transmission.
1
1
0
0
7h
2
0
0
0
No Transmission
2
0
0
1
8h
2
0
1
0
9h
2
0
1
1
Ah
2
1
0
0
Bh
3
0
0
0
No Transmission
The volatile nature of the shift level register requires the
HCS320 to be powered continuously for correct operation and not powered via the buttons.
3
0
0
1
Ch
3
0
1
0
Dh
3
0
1
1
Eh
3
1
0
0
Fh
The SHIFT button is connected to the SHIFT input.
Pressing the SHIFT button increments a counter by
one count and does not result in a transmission. The
counter value is called the shift level. Successive
presses of the SHIFT button can increase the shift level
up to three before wrapping back to zero. The shift level
is available for eight seconds when the SHIFT button is
released, after which the shift level is reset to zero.
 2001 Microchip Technology Inc.
LEVEL
DS41097C-page 13
HCS320
6.0
PROGRAMMING THE HCS320
data in line. After each 16-bit word is loaded, a programming delay is required for the internal program
cycle to complete. This delay can take up to TWC. At the
end of the programming cycle, the device can be verified (Figure 6-2) by reading back the EEPROM. Reading is done by clocking the S2 line and reading the data
bits on PWM. For security reasons, it is not possible to
execute a verify function without first programming the
EEPROM. A Verify operation can only be done
once, immediately following the Program cycle.
When using the HCS320 in a system, the user will have
to program some parameters into the device including
the serial number and the secret key before it can be
used. The programming cycle allows the user to input
all 192 bits in a serial data stream, which are then
stored internally in EEPROM. Programming will be
initiated by forcing the PWM line high, after the S2 line
has been held high for the appropriate length of time
line (Table 6-1 and Figure 6-1). After the Program
mode is entered, a delay must be provided to the
device for the automatic bulk write cycle to complete.
This will set all locations in the EEPROM to zeros . The
device can then be programmed by clocking in 16 bits
at a time, using S2 as the clock line and PWM as the
FIGURE 6-1:
Note:
To ensure that the device does not accidentally enter Programming mode, PWM
should never be pulled high by the circuit
connected to it. Special care should be
taken when driving PNP RF transistors.
PROGRAMMING WAVEFORMS
Enter Program
Mode
TPBW
TDS
TCLKH
TWC
S2
(Clock)
TPS TPH1
TDH
TCLKL
PWM
(Data)
Bit 0
Bit 1
Bit 2
Bit 3
Bit 14
Bit 15
Bit 16
Data for Word 1
Data for Word 0 (KEY_0)
Repeat for each word (12 times)
TPH2
Bit 17
Note 1: Unused button inputs to be held to ground during the entire programming sequence.
2: The VDD pin must be taken to ground after a Program/Verify cycle.
FIGURE 6-2:
VERIFY WAVEFORMS
End of Programming Cycle
Beginning of Verify Cycle
Data from Word 0
PWM
(Data)
Bit190 Bit191
Bit 0
TWC
Bit 1 Bit 2
Bit 3
Bit 14
Bit 15
Bit 16 Bit 17
Bit190 Bit191
TDV
S2
(Clock)
Note: If a Verify operation is to be done, then it must immediately follow the Program cycle.
DS41097C-page 14
 2001 Microchip Technology Inc.
HCS320
TABLE 6-1:
PROGRAMMING/VERIFY TIMING REQUIREMENTS
VDD = 5.0V ± 10%, 25 °C ± 5 °C
Parameter
Program mode setup time
Symbol
Min.
Max.
Units
TPS
3.5
4.5
ms
Hold time 1
TPH1
3.5
—
ms
Hold time 2
TPH2
50
—
µs
Bulk Write time
TPBW
4.0
—
ms
Program delay time
TPROG
4.0
—
ms
Program cycle time
TWC
50
—
ms
—
µs
Clock low time
TCLKL
50
Clock high time
TCLKH
50
—
µs
Data setup time
TDS
0
—
µs(1)
Data hold time
TDH
30
—
µs(1)
Data out valid time
TDV
—
30
µs(1)
Note 1: Typical values - not tested in production.
 2001 Microchip Technology Inc.
DS41097C-page 15
HCS320
7.0
INTEGRATING THE HCS320
INTO A SYSTEM
Use of the HCS320 in a system requires a compatible
decoder. This decoder is typically a microcontroller with
compatible firmware. Microchip will provide (via a
license agreement) firmware routines that accept
transmissions from the HCS320 and decrypt the
hopping code portion of the data stream. These
routines provide system designers the means to
develop their own decoding system.
7.1
Learning a Transmitter to a
Receiver
A transmitter must first be ’learned’ by a decoder before
its use is allowed in the system. Several learning strategies are possible, Figure 7-1 details a typical learn
sequence. Core to each, the decoder must minimally
store each learned transmitter’s serial number and current synchronization counter value in EEPROM. Additionally, the decoder typically stores each transmitter’s
unique crypt key. The maximum number of learned
transmitters will therefore be relative to the available
EEPROM.
A transmitter’s serial number is transmitted in the clear
but the synchronization counter only exists in the code
word’s encrypted portion. The decoder obtains the
counter value by decrypting using the same key used
to encrypt the information. The KEELOQ algorithm is a
symmetrical block cipher so the encryption and decryption keys are identical and referred to generally as the
crypt key. The encoder receives its crypt key during
manufacturing. The decoder is programmed with the
ability to generate a crypt key as well as all but one
required input to the key generation routine; typically
the transmitter’s serial number.
Figure 7-1 summarizes a typical learn sequence. The
decoder receives and authenticates a first transmission; first button press. Authentication involves generating the appropriate crypt key, decrypting, validating
the correct key usage via the discrimination bits and
buffering the counter value. A second transmission is
received and authenticated. A final check verifies the
counter values were sequential; consecutive button
presses. If the learn sequence is successfully complete, the decoder stores the learned transmitter’s
serial number, current synchronization counter value
and appropriate crypt key. From now on the crypt key
will be retrieved from EEPROM during normal operation instead of recalculating it for each transmission
received.
FIGURE 7-1:
TYPICAL LEARN
SEQUENCE
Enter Learn
Mode
Wait for Reception
of a Valid Code
Generate Key
from Serial Number
Use Generated Key
to Decrypt
Compare Discrimination
Value with Fixed Value
Equal
?
No
Yes
Wait for Reception
of Second Valid Code
Use Generated Key
to Decrypt
Compare Discrimination
Value with Fixed Value
Equal
?
No
Yes
Counters
Sequential
?
Yes
No
Learn successful Store:
Learn
Unsuccessful
Serial number
Encryption key
Synchronization counter
Exit
Certain learning strategies have been patented and
care must be taken not to infringe.
DS41097C-page 16
 2001 Microchip Technology Inc.
HCS320
7.2
Decoder Operation
7.3
Figure 7-2 summarizes normal decoder operation. The
decoder waits until a transmission is received. The
received serial number is compared to the EEPROM
table of learned transmitters to first determine if this
transmitter’s use is allowed in the system. If from a
learned transmitter, the transmission is decrypted
using the stored crypt key and authenticated via the
discrimination bits for appropriate crypt key usage. If
the decryption was valid the synchronization value is
evaluated.
FIGURE 7-2:
TYPICAL DECODER
OPERATION
Start
No
Transmission
Received
?
Yes
No
Is
Decryption
Valid
?
Yes
No
Is
Counter
Within 16
?
Yes
No
No
Is
Counter
Within 32K
?
Yes
Save Counter
in Temp Location
 2001 Microchip Technology Inc.
The KEELOQ technology patent scope includes a
sophisticated synchronization technique that does not
require the calculation and storage of future codes. The
technique securely blocks invalid transmissions while
providing transparent resynchronization to transmitters
inadvertently activated away from the receiver.
Figure 7-3 shows a 3-partition, rotating synchronization
window. The size of each window is optional but the
technique is fundamental. Each time a transmission is
authenticated, the intended function is executed and
the transmission’s synchronization counter value is
stored in EEPROM. From the currently stored counter
value there is an initial "Single Operation" forward window of 16 codes. If the difference between a received
synchronization counter and the last stored counter is
within 16, the intended function will be executed on the
single button press and the new synchronization
counter will be stored. Storing the new synchronization
counter value effectively rotates the entire synchronization window.
A "Double Operation" (resynchronization) window further exists from the Single Operation window up to 32K
codes forward of the currently stored counter value. It
is referred to as "Double Operation" because a transmission with synchronization counter value in this window will require an additional, sequential counter
transmission prior to executing the intended function.
Upon receiving the sequential transmission the
decoder executes the intended function and stores the
synchronization counter value. This resynchronization
occurs transparently to the user as it is human nature
to press the button a second time if the first was unsuccessful.
Does
Serial Number
Match
?
Yes
Decrypt Transmission
No
Synchronization with Decoder
(Evaluating the Counter)
Execute
Command
and
Update
Counter
The third window is a "Blocked Window" ranging from
the double operation window to the currently stored
synchronization counter value. Any transmission with
synchronization counter value within this window will
be ignored. This window excludes previously used,
perhaps code-grabbed transmissions from accessing
the system.
Note:
The synchronization method described in
this section is only a typical implementation
and because it is usually implemented in
firmware, it can be altered to fit the needs
of a particular system.
DS41097C-page 17
HCS320
FIGURE 7-3:
SYNCHRONIZATION WINDOW
Entire Window
rotates to eliminate
use of previously
used codes
Blocked
Window
(32K Codes)
Stored
Synchronization
Counter Value
Double Operation
(resynchronization)
Window
(32K Codes)
DS41097C-page 18
Single Operation
Window
(16 Codes)
 2001 Microchip Technology Inc.
HCS320
8.0
ELECTRICAL CHARACTERISTICS
TABLE 8-1:
Note:
ABSOLUTE MAXIMUM RATINGS
Symbol
Item
Rating
Units
VDD
Supply voltage
-0.3 to 13.3
V
VIN
Input voltage
-0.3 to 13.3
V
VOUT
Output voltage
-0.3 to VDD + 0.3
V
IOUT
Max output current
25
mA
TSTG
Storage temperature
-55 to +125
°C (Note)
TLSOL
Lead soldering temp
300
°C (Note)
VESD
ESD rating
4000
V
Stresses above those listed under “ABSOLUTE MAXIMUM RATINGS” may cause permanent damage to
the device.
TABLE 8-2:
DC CHARACTERISTICS
Commercial(C):Tamb = 0°C to +70°C
Industrial(I):Tamb = -40°C to +85°C
3.5V < VDD < 13.0V
Parameter
Operating current (avg)
Sym.
Min
ICC
Typ*
Max
Unit
0.6
2.0
10.0
1.0
3.0
15.0
mA
1
10
µA
Standby current
ICCS
High level Input voltage
VIH
0.4 VDD
VDD+
0.3
V
Low level input voltage
VIL
-0.3
0.15 VDD
V
High level output voltage
VOH
0.5 VDD
Low level output voltage
VOL
LED sink current
ILED
5.0
11.0
RS0-3
RPWM
Pull-down Resistance;
Conditions
VDD = 3.5V
VDD = 6.6V
VDD = 13.0V
(Figure 8-1)
V
IOH = -2 mA
0.11 VDD
V
IOL = 2 mA
6.5
14
9.0
20
mA
VDD = 6.6V
VDD = 13.0V
40
60
80
KΩ
VIN = 4.0V
80
120
160
KΩ
VIN = 4.0V
S0,S1,S2, SHIFT
Pull-down Resistance;
PWM
Note:
Typical values are at 25°C.
 2001 Microchip Technology Inc.
DS41097C-page 19
HCS320
FIGURE 8-1:
TYPICAL ICC CURVE OF HCS320
12.0
10.0
mA
8.0
6.0
4.0
2.0
0.0
2
3
4
5
6
7
8
VBAT [V]
9
10
11
12
13
LEGEND
Typical
Maximum
Minimum
DS41097C-page 20
 2001 Microchip Technology Inc.
HCS320
FIGURE 8-2:
POWER-UP AND TRANSMIT TIMING
Button Press
Detect
Multiple Code Word Transmission
TBP
TTD
TDB
PWM
Output
Code
Word
1
Code
Word
2
Code
Word
3
Code
Word
n
Code
Word
4
TTO
Button
Input
Sn
FIGURE 8-3:
POWER-UP AND TRANSMIT TIMING REQUIREMENTS
VDD = +3.5 to13.0V
Commercial (C): Tamb = 0°C to +70°C
Industrial
(I): Tamb = -40°C to +85°C
Parameter
Symbol
Min
Max
Unit
Remarks
Time to second button press
TBP
10 + Code
Word Time
27 + Code
Word Time
ms
(Note 1)
Transmit delay from button detect
TTD
10
27
ms
Debounce delay
TDB
6
15
ms
Auto-shutoff time-out period
TTO
22
77
s
(Note 2)
Note 1: TBP is the time in which a second button can be pressed without completion of the first code word and the
intention was to press the combination of buttons.
2: The Auto-shutoff time-out period is not tested.
FIGURE 8-4:
CODE WORD FORMAT
TE TE TE
LOGIC ‘0’
LOGIC ‘1’
Bit Period
TBP
50% Duty Cycle
Preamble
TP
 2001 Microchip Technology Inc.
Header
TH
Encrypted Portion
of Transmission
THOP
Fixed Portion of
Transmission
TFIX
Guard
Time
TG
DS41097C-page 21
HCS320
FIGURE 8-5:
CODE WORD FORMAT: PREAMBLE/HEADER PORTION
P1
P12
23 TE 50% Duty Cycle Preamble
FIGURE 8-6:
Bit 0 Bit 1
10 TE Header
Data Bits
Button Code
Status
CODE WORD FORMAT: DATA PORTION
Serial Number
MSB LSB
LSB
Bit 0 Bit 1
Header
MSB
S0
S1
S2
VLOW RPT
Bit 30 Bit 31 Bit 32 Bit 33 Bit 58 Bit 59 Bit 60 Bit 61 Bit 62 Bit 63 Bit 64 Bit 65
Guard
Time
Fixed Portion
Encrypted Portion
TABLE 8-3:
S3
CODE WORD TRANSMISSION TIMING REQUIREMENTS
VDD = +3.5 to 13.0
Commercial(C):Tamb = 0°C to +70°C
Industrial(I):Tamb = -40°C to +85°C
Code Words Transmitted
All
Number
Min.
of TE
1 out of 2
1 out of 4
Typ.
Max.
Min.
Typ.
Max.
Min.
Typ.
Max. Units
280
400
620
140
200
310
70
100
155
µs
3
840
1200
1860
420
600
930
210
300
465
µs
Symbol
Characteristic
TE
Basic pulse element
1
TBP
PWM bit pulse width
TP
Preamble duration
23
6.4
9.2
14.3
3.2
4.6
7.1
1.6
2.3
3.6
ms
TH
Header duration
10
2.8
4.0
6.2
1.4
2.0
3.1
0.7
1.0
1.6
ms
THOP
Hopping code duration
96
26.9
38.4
59.5
13.4
19.2
29.8
6.7
9.6
14.9
ms
TFIX
Fixed code duration
102
28.6
40.8
63.2
14.3
20.4
31.6
7.1
10.2
15.8
ms
TG
Guard Time
199
55.6
79.6
123.5
28.1
39.8
61.7
13.8
19.9
30.6
ms
—
Total Transmit Time
430
120.3 172.0
266.7
60.4
86.0 133.3 29.9
43.0
66.5
ms
—
PWM data rate
—
2381 1667 1075 4762 3333 2151
bps
Note:
1190
833
538
The timing parameters are not tested but derived from the oscillator clock.
DS41097C-page 22
 2001 Microchip Technology Inc.
HCS320
FIGURE 8-7:
HCS320 TE VS. TEMP (BY CHARACTERIZATION ONLY)
1.7
1.6
1.5
1.4
1.3
TE
1.2
1.1
1.0
0.9
0.8
TE Max.
VDD = 3.5V
VDD = 5.0V
TE Max.
VDD = 5.0V
Typical
VDD = 5.0V
0.7
TE Min.
0.6
-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
TEMPERATURE
 2001 Microchip Technology Inc.
DS41097C-page 23
HCS320
9.0
PACKAGING INFORMATION
9.1
Package Marking Information
8-Lead PDIP (300 mil)
Example
XXXXXXXX
XXXXXNNN
YYWW
HCS200
XXXXXNNN
0025
8-Lead SOIC (150 mil)
Example
XXXXXXX
XXXYYWW
NNN
HCS200
XXX0025
NNN
Legend:
Note:
*
XX...X
Y
YY
WW
NNN
Customer specific information*
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line thus limiting the number of available characters
for customer specific information.
Standard PICmicro device marking consists of Microchip part number, year code, week code, and
traceability code. For PICmicro device marking beyond this, certain price adders apply. Please check
with your Microchip Sales Office. For QTP devices, any special marking adders are included in QTP
price.
DS41097C-page 24
 2001 Microchip Technology Inc.
HCS320
9.2
Package Details
8-Lead Plastic Dual In-line (P) - 300 mil (PDIP)
E1
D
2
n
1
α
E
A2
A
L
c
A1
β
B1
p
eB
B
Units
Dimension Limits
n
p
Number of Pins
Pitch
Top to Seating Plane
Molded Package Thickness
Base to Seating Plane
Shoulder to Shoulder Width
Molded Package Width
Overall Length
Tip to Seating Plane
Lead Thickness
Upper Lead Width
Lower Lead Width
Overall Row Spacing
Mold Draft Angle Top
Mold Draft Angle Bottom
* Controlling Parameter
§ Significant Characteristic
A
A2
A1
E
E1
D
L
c
§
B1
B
eB
α
β
MIN
.140
.115
.015
.300
.240
.360
.125
.008
.045
.014
.310
5
5
INCHES*
NOM
MAX
8
.100
.155
.130
.170
.145
.313
.250
.373
.130
.012
.058
.018
.370
10
10
.325
.260
.385
.135
.015
.070
.022
.430
15
15
MILLIMETERS
NOM
8
2.54
3.56
3.94
2.92
3.30
0.38
7.62
7.94
6.10
6.35
9.14
9.46
3.18
3.30
0.20
0.29
1.14
1.46
0.36
0.46
7.87
9.40
5
10
5
10
MIN
MAX
4.32
3.68
8.26
6.60
9.78
3.43
0.38
1.78
0.56
10.92
15
15
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.010” (0.254mm) per side.
JEDEC Equivalent: MS-001
Drawing No. C04-018
 2001 Microchip Technology Inc.
DS41097C-page 25
HCS320
8-Lead Plastic Small Outline (SN) - Narrow, 150 mil (SOIC)
E
E1
p
D
2
B
n
1
α
h
45°
c
A2
A
φ
β
L
Units
Dimension Limits
n
p
Number of Pins
Pitch
Overall Height
Molded Package Thickness
Standoff §
Overall Width
Molded Package Width
Overall Length
Chamfer Distance
Foot Length
Foot Angle
Lead Thickness
Lead Width
Mold Draft Angle Top
Mold Draft Angle Bottom
* Controlling Parameter
§ Significant Characteristic
A
A2
A1
E
E1
D
h
L
φ
c
B
α
β
MIN
.053
.052
.004
.228
.146
.189
.010
.019
0
.008
.013
0
0
A1
INCHES*
NOM
8
.050
.061
.056
.007
.237
.154
.193
.015
.025
4
.009
.017
12
12
MAX
.069
.061
.010
.244
.157
.197
.020
.030
8
.010
.020
15
15
MILLIMETERS
NOM
8
1.27
1.35
1.55
1.32
1.42
0.10
0.18
5.79
6.02
3.71
3.91
4.80
4.90
0.25
0.38
0.48
0.62
0
4
0.20
0.23
0.33
0.42
0
12
0
12
MIN
MAX
1.75
1.55
0.25
6.20
3.99
5.00
0.51
0.76
8
0.25
0.51
15
15
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.010” (0.254mm) per side.
JEDEC Equivalent: MS-012
Drawing No. C04-057
DS41097C-page 26
 2001 Microchip Technology Inc.
HCS320
ON-LINE SUPPORT
Microchip provides on-line support on the Microchip
World Wide Web (WWW) site.
The web site is used by Microchip as a means to make
files and information easily available to customers. To
view the site, the user must have access to the Internet
and a web browser, such as Netscape or Microsoft
Explorer. Files are also available for FTP download
from our FTP site.
Connecting to the Microchip Internet Web
Site
Systems Information and Upgrade Hot
Line
The Systems Information and Upgrade Line provides
system users a listing of the latest versions of all of
Microchip's development systems software products.
Plus, this line provides information on how customers
can receive any currently available upgrade kits.The
Hot Line Numbers are:
1-800-755-2345 for U.S. and most of Canada, and
1-480-792-7302 for the rest of the world.
The Microchip web site is available by using your
favorite Internet browser to attach to:
www.microchip.com
The file transfer site is available by using an FTP service to connect to:
ftp://ftp.microchip.com
The web site and file transfer site provide a variety of
services. Users may download files for the latest
Development Tools, Data Sheets, Application Notes,
User’s Guides, Articles and Sample Programs. A variety of Microchip specific business information is also
available, including listings of Microchip sales offices,
distributors and factory representatives. Other data
available for consideration is:
• Latest Microchip Press Releases
• Technical Support Section with Frequently Asked
Questions
• Design Tips
• Device Errata
• Job Postings
• Microchip Consultant Program Member Listing
• Links to other useful web sites related to
Microchip Products
• Conferences for products, Development Systems,
technical information and more
• Listing of seminars and events
 2001 Microchip Technology Inc.
DS41097C-page 27
HCS320
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Telephone: (_______) _________ - _________
FAX: (______) _________ - _________
Application (optional):
Would you like a reply?
Device: HCS320
Y
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Literature Number: DS41097C
Questions:
1. What are the best features of this document?
2. How does this document meet your hardware and software development needs?
3. Do you find the organization of this data sheet easy to follow? If not, why?
4. What additions to the data sheet do you think would enhance the structure and subject?
5. What deletions from the data sheet could be made without affecting the overall usefulness?
6. Is there any incorrect or misleading information (what and where)?
7. How would you improve this document?
8. How would you improve our software, systems, and silicon products?
DS41097C-page 28
 2001 Microchip Technology Inc.
HCS320
HCS320 PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
HCS320
-
/P
Package:
Temperature
Range:
Device:
P = Plastic DIP (300 mil Body), 8-lead
SN = Plastic SOIC (150 mil Body), 8-lead
Blank = 0°C to +70°C
I = –40°C to +85°C
HCS320 = Code Hopping Encoder
HCS320T = Code Hopping Encoder (Tape and Reel)
Sales and Support
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences
and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of
the following:
1.
2.
3.
Your local Microchip sales office
The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
 2001 Microchip Technology Inc.
DS41097C-page 29
HCS320
NOTES:
DS41097C-page 30
 2001 Microchip Technology Inc.
Microchip’s Secure Data Products are covered by some or all of the following patents:
Code hopping encoder patents issued in Europe, U.S.A., and R.S.A. — U.S.A.: 5,517,187; Europe: 0459781; R.S.A.: ZA93/4726
Secure learning patents issued in the U.S.A. and R.S.A. — U.S.A.: 5,686,904; R.S.A.: 95/5429
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical components in life support systems is not authorized except with
express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, FilterLab,
KEELOQ, MPLAB, PIC, PICmicro, PICMASTER, PICSTART,
PRO MATE, SEEVAL and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A. and other countries.
dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microID,
microPort, Migratable Memory, MPASM, MPLIB, MPLINK,
MPSIM, MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select
Mode and Total Endurance are trademarks of Microchip
Technology Incorporated in the U.S.A.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2001, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999. The
Company’s quality system processes and
procedures are QS-9000 compliant for its
PICmicro® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs and microperipheral
products. In addition, Microchip’s quality
system for the design and manufacture of
development systems is ISO 9001 certified.
 2001 Microchip Technology Inc.
DS41097C - page 31
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10/01/01
DS41097C-page 32
 2001 Microchip Technology Inc.