HCS370I/SL [MICROCHIP]
暂无描述;
| 型号： | HCS370I/SL |
| 厂家： | 
MICROCHIP |
| 描述： | 暂无描述 编码器 |
| 文件： | 总36页 (文件大小：497K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
HCS370
®
KEELOQ Code Hopping Encoder
FEATURES
Security
PACKAGE TYPES
PDIP, SOIC,
TSSOP
S0
S1
1
2
3
4
5
6
7
14
13
12
11
10
9
VDD
• Two programmable 32-bit serial numbers
• Two programmable 64-bit encoder keys
• Two programmable 60-bit seed values
• Each transmission is unique
LED
S2
DATA
Vss
S3
• 67/69-bit transmission code length
• 32-bit hopping code
S4
RFEN
STEP
SLEEP/S5
SHIFT
• Crypt keys are read protected
VIN
8
Operating
• 2.05-5.5V operation
HCS370 BLOCK DIAGRAM
• Six button inputs
Oscillator
VIN
SLEEP
• 15 functions available
Power
latching
and
Step-up
regulator
STEP
• Four selectable baud rates
Controller
RESET circuit
switching
• Selectable minimum code word completion
• Battery low signal transmitted to receiver
• Nonvolatile synchronization data
• PWM, VPWM, PPM, and Manchester modulation
• Button queue information transmitted
• Dual Encoder functionality
LED
LED driver
RF Enable
RFEN
EEPROM
Encoder
DATA
32-bit SHIFT register
Button input port
Other
VSS
• On-chip EEPROM
VDD
• On-chip tuned oscillator (±10% over voltage and
temperature)
SHIFT
S5
S4
S3
S2
S1
S0
• Button inputs have internal pull-down resistors
• LED output
GENERAL DESCRIPTION
• PLL control for ASK and FSK
• Low external component count
• Step-up voltage regulator
The HCS370 is a code hopping encoder designed for
secure Remote Keyless Entry (RKE) and secure
remote control systems. The HCS370 utilizes the
®
KEELOQ code hopping technology, which incorpo-
Typical Applications
rates high security, a small package outline, and low
cost to make this device a perfect solution for unidirec-
tional authentication systems and access control sys-
tems.
The HCS370 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
The HCS370 combines a hopping code generated by a
nonlinear encryption algorithm, a serial number, and
status bits to create a secure transmission code. The
length of the transmission eliminates the threat of code
scanning and code grabbing access techniques.
• Burglar alarm systems
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 1
HCS370
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 pro-
grammable but read protected. The data can be veri-
fied only after an automatic erase and programming
operation. This protects against attempts to gain
access to keys or manipulate synchronization values.
In addition, the HCS370 supports a dual encoder. This
allows two manufacturers to use the same device with-
out having to use the same manufacturer’s code in
each of the encoders. The HCS370 provides an easy
to use serial interface for programming the necessary
keys, system parameters, and configuration data.
- Simple Learning
The receiver uses a fixed crypt key. The crypt
key is common to every component used by
the same manufacturer.
- Normal Learning
The receiver derives a crypt key from the
encoder serial number. Every transmitter has
a unique crypt key.
- Secure Learning
The receiver derives a crypt key from the
encoder seed value. Every encoder has a
unique seed value that is only transmitted by
a special button combination.
• Manufacturer’s Code – A unique and secret 64-
bit number used to derive 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.
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 (TB003).
The HCS370 code hopping encoder is designed specif-
ically for keyless entry systems. In particular, typical
applications include vehicles and home garage door
openers. The encoder portion of a keyless entry sys-
tem is integrated into a transmitter carried by the user.
The transmitter is operated to gain access to a vehicle
or restricted area. The HCS370 is meant to be a cost-
effective yet secure solution to such systems requiring
very few external components (Figure 2-1).
• RKE - Remote Keyless Entry
• Button Status - Indicates what button input(s)
activated the transmission. Encompasses the 6
button status bits S5, S4, S3, S2, S1 and S0
(Figure 3-2).
• Code Hopping - A method by which a code,
viewed externally to the system, appears to
change unpredictably each time it is transmitted.
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.
• Code Word - A block of data that is repeatedly
transmitted upon button activation (Figure 3-2).
• Transmission - A data stream consisting of
repeating code words (Figure 4-1).
• Crypt Key - A unique and secret 64-bit number
used to encrypt and decrypt data. In a symmetri-
cal 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.
The HCS370, on the other hand, employs the KEELOQ
code hopping technology coupled with a transmission
length of 67 bits to virtually eliminate the use of code
‘grabbing’ or code ‘scanning’. The high security level of
the HCS370 is based on the patented KEELOQ technol-
ogy. 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 if a single
hopping code data bit changes (before encryption), sta-
tistically more than 50% of the encrypted data bits will
change.
• 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 (i.e., HCS5XX).
• 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 facil-
itates several learning strategies to be imple-
mented on the decoder. The following are
examples of what can be done.
DS41111D-page 2
Preliminary
2002 Microchip Technology Inc.
HCS370
As indicated in the block diagram on page one, the
HCS370 has a small EEPROM array which must be
loaded with several parameters before use; most often
programmed by the manufacturer at the time of produc-
tion. 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 manufac-
turer’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 serial number, typically unique for every
encoder
• A crypt key
• An initial synchronization value
FIGURE 1-1:
CREATION AND STORAGE OF CRYPT KEY DURING PRODUCTION
Production
Programmer
HCS370
Transmitter
Serial Number
EEPROM Array
Serial Number
Crypt Key
Sync Counter
.
.
.
Key
Crypt
Key
Manufacturer’s
Code
Generation
Algorithm
The synchronization counter is the basis behind the
transmitted code word changing for each transmission;
it increments each time a button is pressed. Each incre-
ment of the synchronization value results in more than
50% of the hopping code bits changing.
Finally, the button status is checked to see what opera-
tion is requested. Figure 1-3 shows the relationship
between some of the values stored by the receiver and
the values received from the transmitter.
For detailed decoder operation, see Section 7.0.
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 syn-
chronization 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 while its value will
appear to ‘randomly hop around’. Hence, this data 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 4.1.
A receiver may use any type of controller as a decoder.
Typically, it is a microcontroller with compatible firm-
ware that allows the decoder to operate in conjunction
with an HCS370 based transmitter.
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, storing the
serial number, storing the synchronization counter
value, and storing crypt key in EEPROM.
In normal operation, each received message of valid
format is evaluated. The serial number is used to deter-
mine if it is from a learned transmitter. If the serial num-
ber is from a learned transmitter, the message is
decrypted and the synchronization counter is verified.
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 3
HCS370
FIGURE 1-2:
BUILDING THE TRANSMITTED CODE WORD (ENCODER)
EEPROM Array
Crypt Key
KEELOQ
Encryption
Algorithm
Sync Counter
Serial Number
Button Press
Serial Number
Information
32 Bits
Encrypted Data
Transmitted Information
FIGURE 1-3:
BASIC OPERATION OF RECEIVER (DECODER)
1
Received Information
EEPROM Array
32 Bits of
Encrypted Data
Button Press
Information
Manufacturer Code
Serial Number
Check for
Match
B0
B1
Serial Number
2
Sync Counter
Crypt Key
3
KEELOQ
Decryption
Algorithm
Decrypted
Synchronization
Counter
Verify
Counter
4
Perform Function
Indicated by
5
button press
NOTE: Circled numbers indicate the order of execution.
DS41111D-page 4
Preliminary
2002 Microchip Technology Inc.
HCS370
FIGURE 2-1: TYPICAL CIRCUITS
2.0
DEVICE DESCRIPTION
Figure 2-1(A)
As shown in the typical application circuits (Figure 2-1),
the HCS370 is an easy device to use. It requires only
the addition of buttons and RF circuitry for use as the
encoder in your security application. A description of
each pin is described in Table 2-1. Refer to Figure 2-3
for information on the I/O pins.
VDD
RLED
B0
B1
B2
B3
B4
B5
S0
S1
S2
S3
S4
VDD
LED
Note: S0-S5 and SHIFT inputs have pull-down
resistors. VIN should be tied high if the
step-up regulator is not used.
RF PLL
Tx out
DATA
VSS
DATA IN
TABLE 2-1:
Name
PIN DESCRIPTIONS
Pin
RFEN
ENABLE
S5
STEP
VIN
VDD
Description
SHIFT
Number
S0
S1
1
2
3
4
5
6
Switch input S0
Six Button remote with PLL control
Switch input S1
Switch input S2
Switch input S3
Switch input S4
S2
S3
Figure 2-1(B)
S4
2.05-5.5V
S5/SLEEP
Switch input S5, or SLEEP
output
330 µH
SHIFT
VIN
7
8
SHIFT input
S0
S1
S2
S3
S4
VDD
Step-up regulator input
Step-up pulses output
RF enable output
LED
1N4148
6V@1 mA
Tx out
STEP
RFEN
VSS
9
DATA
COUT
33k
Ω
Ω
VSS
10
11
12
13
22 µF
10k
RFEN
Ground reference
Transmission output pin
SLEEP STEP
SHIFT
2N3904
DATA
LED
2.2 kΩ
VIN
Open drain output for LED
with pull-up resistor
1000 pF
Two Button remote with Step-up circuit
VDD
14
Positive supply voltage
Note: Using SLEEP output low instead of grounding the resistor
divider reduces battery drain between transmissions
The HCS370 will normally be in a low power SLEEP
mode. When a button input is taken high, the device will
wake-up, start the step-up regulator, and go through
the button debounce delay of TDB before the button
code is latched. In addition, the device will then read
the configuration options. Depending on the configura-
tion options and the button code, the device will deter-
mine what the data and modulation format will be for
the transmission. The transmission will consist of a
stream of code words and will be transmitted TPU after
the button is pressed for as long as the buttons are held
down or until a time-out occurs. The code word format
can be either a code hopping format or a seed format.
Figure 2-1(C)
VDD
Tx2
Tx1
RLED
S0
VDD
LED
S1
S2
S3
S4
DATA
VSS
Tx out
RFEN
The time-out time can be selected with the Time-out
Select (TSEL) configuration option. This option allows
the time-out to be set to 0.8s, 3.2s, 12.8s, or 25.6s.
When a time-out occurs, the device will go into SLEEP
mode to protect the battery from draining when a button
gets stuck. This option must be chosen to meet maxi-
mum transmission length regulatory limits which vary
by country.
S5
STEP
VIN
VDD
SHIFT
DUAL Transmitter remote control
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 5
HCS370
If the device is in the transmit process and detects that
a new button is pressed, the current code word will be
aborted, a new code word will be transmitted and the
time-out counter will RESET. If all the buttons are
released, a minimum number of code words will still be
completed. The minimum code words can be set to 1,
2, 4, or 8 using the Minimum Code Words (MTX) con-
figuration option. If the time for transmitting the mini-
mum code words is longer than the time-out time, the
device will not complete the minimum code words.
FIGURE 2-2: I/O CIRCUITS
Figure 2-2(D)
VDD
P
DATA, RFEN
STEP
Outputs
N
The HCS370 has an onboard nonvolatile EEPROM.
This EEPROM is used to store user programmable
data and the synchronization counter. The data is pro-
grammed at the time of production and includes the
security related information such as encoder keys,
serial numbers, discrimination values, and seed val-
ues. All the security related options are read protected.
Figure 2-2(E)
VIN
-
+
1.2V
The initial counter value is also programmed at the time
of production. From then on the device maintains the
counter itself. The HCS370 has built in redundancy for
counter protection and can recover from counter cor-
ruption.
FIGURE 2-3: I/O CIRCUITS (CONTINUED)
Figure 2-3(A)
The counter will not increment if the previous write was
corrupted by low voltage RESET or power failure dur-
ing TPLL. Instead, the counter will revert back to the
previous count and the HCS370 will attempt to correct
the bad bits. This will continue on every button press
until the voltage increases and the counter is success-
fully corrected.
S0, S1, S2
S3, S4, SHIFT
Inputs
ZIN
Figure 2-3(B)
S5
VDD
P
SLEEP
S5/SLEEP
N
ZIN
SOEN
N
Figure 2-3(C)
VDD
P
Weak
LED
LED
LED Output
N
DS41111D-page 6
Preliminary
2002 Microchip Technology Inc.
HCS370
FIGURE 2-4: BASIC FLOW DIAGRAM OF
THE DEVICE OPERATION
START
Sample Buttons
Get Config
Yes
Read
Seed
Seed
TX?
No
Increment
Counter
Encrypt
Transmit
Yes
Time
Out
No
No
MTX
STOP
Yes
No
Buttons
Yes
No
Yes
Yes
Seed
Time
Seed
Button
No
No
New
No
Buttons
Yes
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 7
HCS370
entire option size. Options such as SEED1, which
have a length that is not an exact multiple of 8 bits, is
stored right justified in the reserved space. Additional
smaller options such as SDBT1 may be stored in the
same address as the Most Significant bits.
3.0
EEPROM ORGANIZATION
A summary of the HCS370 EEPROM organization is
shown in the three tables below. The address column
shows the starting address of the option, and its length
or bit position. Options larger than 8 bits are stored
with the Most Significant bits at the given address.
Enough consecutive 8-bit blocks are reserved for the
TABLE 3-1:
ENCODER1 OPTIONS (SHIFT = 0)
Reference
Section
(1)
Symbol
Address16:Bits
Description
KEY1
1E: 64 bits
14: 60 bits
Encoder Key
3.2.2
SEED1
SYNC1
Encoder Seed Value
3.3
00: 20 bits
00: 18 bits
Encoder Synchronization Counter (CNTSEL=1)
Encoder Synchronization Counter (CNTSEL=0) plus overflow
3.2, 3.2.1
SER1
10: 32 bits
1C: 10 bits
1C: ---- 32--
Encoder Serial Number
3.2.2
DISC1
MSEL1
Encoder Discrimination value
3.2, 3.2.1
4.1
Transmission Modulation Format
Value2
00
Format
PWM
01
Manchester
VPWM
10
11
PPM
HSEL1
XSER1
QUEN1
STEN1
LEDBL1
LEDOS1
SDLM1
SDMD1
SDBT1
SDTM1
1C: ---4 ----
1C: --5- ----
1C: -6-- ----
1C: 7--- ----
3F: -6-- ----
3F: 7--- ----
3C: ---- ---0
3C: ---- --1-
14: 7654 ----
3C: ---- 32--
Header Select
4 TE = 0
28 bits = 0
Disable = 0
Disable = 0
Never = 0
50 ms = 0
Disable = 0
User = 0
10 TE = 1
32 bits = 1
Enable = 1
Enable = 1
Once = 1
100 ms = 1
Enable = 1
Production = 1
4.1
3.2
5.6
4.1
5.3
5.3
3.3
3.3
3.3
3.3
Extended Serial Number
Queue counter Enable
START/STOP Pulse Enable
Low Voltage LED Blink
(1)
LED On Time Select
Limited Seed
Seed Mode
Seed Button Code
(1)
Time Before Seed Code Word
Value2
00
Time (s)
0.0
01
0.8
10
1.6
11
3.2
(1)
BSEL1
GSEL1
3C: --54 ----
3C: 76-- ----
Transmission Baud Rate Select
Value2
00
TE (µs)
100
4.1
01
200
10
400
11
800
(1)
Guard Time Select
Value2
00
Time (ms)
2 TE
4.1, 5.2
01
6.4
10
51.2
102.4
11
Note 1: All Timing values vary ±10%.
DS41111D-page 8
Preliminary
2002 Microchip Technology Inc.
HCS370
TABLE 3-2:
ENCODER2 OPTIONS (SHIFT = 1)
Reference
Section
Description(1)
Address16:Bits
Symbol
KEY2
34: 64 bits
2A: 60 bits
Encoder Key
3.2.1
3.3
SEED2
SYNC2
Encoder Seed Value
08: 20 bits
08: 18 bits
Encoder Synchronization Counter (CNTSEL=1)
Encoder Synchronization Counter (CNTSEL=0) plus overflow
3.2,
3.2.1
SER2
26: 32 bits
32: 10 bits
32: ---- 32--
Encoder Serial Number
3.2, 3.2.2
3.2, 3.2.1
4.1
DISC2
MSEL2
Encoder Discrimination value
Transmission Modulation
Format
Value2
00
Format
PWM
01
Manchester
VPWM
10
11
PPM
HSEL2
XSER2
QUEN2
STEN2
LEDBL2
LEDOS2
SDLM2
SDMD2
SDBT2
SDTM2
32: ---4 ----
32: --5- ----
32: -6-- ----
32: 7--- ----
3D: -6-- ----
3D: 7--- ----
3E: ---- ---0
3E: ---- --1-
2A: 7654 ----
3E: ---- 32--
Header Select
4 TE = 0
28 bits = 0
Disable = 0
Disable = 0
Never = 0
50 ms = 0
Disable = 0
User = 0
10 TE = 1
32 bits = 1
Enable = 1
Enable = 1
Once = 1
100 ms = 1
Enable = 1
4.1
3.2
5.6
4.1
5.3
5.3
3.3
Extended Serial Number
Queue counter Enable
START/STOP Pulse Enable
Low Voltage LED Blink
LED On Time Select(1)
Limited Seed
Seed Mode
Production = 1 3.3
3.3
Seed Button Code
Time Before Seed Code word(1)
Value2
00
Time (s)
0.0
3.3
01
0.8
10
1.6
11
3.2
BSEL2
GSEL2
3E: --54 ----
3E: 76-- ----
Transmission Baud Rate
Select(1)
Value2
00
TE (µs)
100
4.1
01
200
10
400
11
800
Guard Time Select(1)
Value2
00
Time (ms)
2 TE
6.4
4.1, 5.2
01
10
51.2
102.4
11
Note 1: All Timing values vary ±10%.
TABLE 3-3:
DEVICE OPTIONS
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 9
HCS370
Reference
Section
Address16:Bits
Symbol
Description(1)
Value2
WAKE
3F: ---- --10
Wake-up(1)
Value
No Wake-up
75 ms 50%
50 ms 33.3%
100 ms 16.7%
20 bits = 1
Enable = 1
3.2V = 1
FSK = 1
Value
4.1
00
01
10
11
CNTSEL
VLOWL
VLOWSEL
PLLSEL
MTX
3F: ---- -2--
3F: ---- 3---
3F: ---4 ----
3F: --5- ----
3D: ---- --10
Counter Select
16 bits = 0
Disable = 0
2.2 V = 0
ASK = 0
Value2
00
3.2.1
3.2.3.1
3.2.3.1
5.2
Low Voltage Latch Enable
Low Voltage Trip Point Select(2)
PLL Interface Select
Minimum Code Words
2.0
1
01
2
10
4
11
8
SOEN
WAIT
TSEL
3D: ---- 3---
3D: ---- -2--
3D: --54 ----
SLEEP Output Enable
Wait for Step-Up Regulator
Time-out Select(1)
Disable = 0
Disable = 0
Value2
00
Enable = 1
Enable = 1
Time(s)
0.8
5.4
5.2, 5.4
2.0
01
3.2
10
12.8
11
25.6
Note 1: All Timing values vary ±10%.
2: Voltage thresholds are ±150 mV.
3.1
Dual Encoder Operation
The HCS370 contains two transmitter configurations
with separate serial numbers, encoder keys, discrimi-
nation values, syncronization counters, and seed val-
ues. The code word is calculated using one of two
possible encoder configurations. Most options for code
word and modulation formats can be different from
Encoder 1 and Encoder 2. However, LED and RF
transmitter options have to be the same. The SHIFT
input pin is used to select between the encoder config-
urations. A low on the SHIFT pin will select Encoder 1
and a high will select Encoder 2.
DS41111D-page 10
Preliminary
2002 Microchip Technology Inc.
HCS370
serial number. This will be stored by the receiver sys-
tem after a transmitter has been learned. The discrimi-
nation bits are part of the information that is to form the
encrypted portion of the transmission.
3.2
Code Word Format
A KEELOQ code word consists of 32 bits of hopping
code data, 32 bits of fixed code data, and between 3 to
5 bits of status information. Various code word formats
are shown in Figure 3-1 and Figure 3-2.
3.2.2
FIXED CODE PORTION
The 32 bits of fixed code consist of 28 bits of the serial
number (SER) and a copy of the 4-bit function code.
This can be changed to contain the whole 32-bit serial
number by setting the Extended Serial Number (XSER)
configuration option to a 1. If more than one button is
pressed, the function codes are logically OR’ed
together. The function code is repeated in the
encrypted and unencrypted data of a transmission.
3.2.1
HOPPING CODE PORTION
The hopping code portion is calculated by encrypting
the counter, discrimination value, and function code
with the Encoder Key (KEY). The hopping code is cal-
culated when a button press is debounced and remains
unchanged until the next button press.
The synchronization counter can be either a 16- or 20-
bit value. The Configuration Option Counter Select
(CNTSEL) will determine this. The counter select option
must be the same for both Encoder 1 and Encoder 2.
TABLE 3-4:
Button
FUNCTION CODES
Function Code2
If the 16-bit counter is selected, the discrimination value
is 10 bits long and there are 2 counter overflow bits
(OVR0, OVR1). Set both bits in production and OVR0
will be cleared on the first counter overflow and OVR1 on
the second. Clearing OVR0 with OVR1 set will only
detect the first overflow. Clearing both OVR bits will
effectively give 12 constant bits for discrimination.
S0
S1
S2
S3
S4
S5
xx1x2
x1xx2
1xxx2
xxx12
111x2
11x12
If the counter is 20 bits, the discrimination value is 8 bits
long and there are no overflow bits. The rest of the 32
bits are made up of the function code also known as the
button inputs.
3.2.3
STATUS INFORMATION
The status bits will always contain the output of the Low
Voltage (VLOW) detector and Cyclic Redundancy
Check (CRC). If Queue (QUEN) is enabled, button
queue information will be included in the code words.
The discrimination value can be programmed with any
value to serve as a post decryption check on the
decoder end. In a typical system, this will be pro-
grammed with the 8 or 10 Least Significant bits of the
FIGURE 3-1: CODE WORD DATA FORMAT (16-BIT COUNTER)
With XSER=0, 16-bit Counter, QUEN=0
Fixed Code Portion (32 Bits)
Hopping Code Portion (32 Bits)
Status Information
(3 Bits)
Synchronization
Counter
16 Bits
Counter
BUT Overflow
4 Bits 2 Bits
CRC
VLOW
1-Bit 4 Bits
BUT
SERIAL NUMBER
(28 Bits)
DISC
10 Bits
2 Bits
0
15
C1
C0
S2 S1 S0 S3
S2 S1 S0 S3 OVR1
OVR0
With XSER=1, 16-bit Counter, QUEN=1
Fixed Code Portion (32 Bits)
Hopping Code Portion (32 Bits)
Synchronization
Status Information
(5 Bits)
Counter
16 Bits
Counter
BUT Overflow
4 Bits 2 Bits
SERIAL NUMBER
(32 Bits)
QUE
CRC VLOW
DISC
10 Bits
2 Bits 2 Bits 1-Bit
0
15
Q1 Q0 C1 C0
S2 S1 S0 S3 OVR1
OVR0
Transmission Direction LSB First
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 11
HCS370
FIGURE 3-2: CODE WORD DATA FORMAT (20-BIT COUNTER)
With XSER=0, 20-bit Counter, QUEN=1
Fixed Code Portion (32 Bits)
Hopping Code Portion (32 Bits)
Status Information
(5 Bits)
Synchronization
Counter
20 Bits
QUE
CRC VLOW
BUT
SERIAL NUMBER
(28 Bits)
BUT
4 Bits
DISC
8 Bits
2 Bits 2 Bits 1-Bit 4 Bits
0
19
Q1 Q0 C1 C0
S2 S1 S0 S3
S2 S1 S0 S3
With XSER=1, 20-bit Counter, QUEN=0
Fixed Code Portion (32 Bits)
Hopping Code Portion (32 Bits)
Synchronization
Status Information
(3 Bits)
Counter
20 Bits
CRC
2 Bits
VLOW
1-Bit
SERIAL NUMBER
(32 Bits)
BUT
4 Bits
DISC
8 Bits
0
19
C1 C0
S2 S1 S0 S3
Transmission Direction LSB First
3.2.3.1
Low Voltage Detector Status (VLOW)
A low battery voltage detector onboard the HCS370
can indicate when the operating voltage drops below a
predetermined value. There are two options available
depending on the Low Voltage Trip Point Select
(VLOWSEL) configuration option. The two options pro-
vided are:
• A 2.2V nominal level for 3V operation
• A 3.2V nominal level for 5V operation
The output of the low voltage detector is checked on
the first preamble pulse of each code word with the
LED momentarily turned off. The VLOW bit is transmit-
ted in each code word so the decoder can give an indi-
cation to the user that the transmitter battery is low.
Operation of the LED changes as well to further indi-
cate that the battery is low and needs replacing.
The output of the Low Voltage Detector can also be
latched once it has dropped below the selected value.
The Low Voltage Latch (VLOWL) configuration option
enables this option. If this option is enabled, the detec-
tor level is raised to 3V or 5V once a low battery voltage
has been detected, like a Schmitt Trigger.
This will effectively hold the VLOW bit high until the bat-
tery is replaced. If the Low Voltage Latch is enabled,
then the low TE after the first preamble pulse can
stretch by 4 ms one time as the latch changes state.
DS41111D-page 12
Preliminary
2002 Microchip Technology Inc.
HCS370
the serial number and the seed from a single but-
ton press.
3.3
Seed Code Word Data Format
A seed transmission transmits a code word that con-
sists of 60 bits of fixed data that is stored in the
EEPROM. This can be used for secure learning of
encoders or whenever a fixed code transmission is
required. The seed code word is identified by the func-
tion bits = 11112. The seed code word also contains the
status information (VLOW, CRC, and QUEUE). The
Seed code word format is shown in Figure 3-3. The
function code for seed code words is always 11112.
• The button code for transmitting a seed code
word can be selected with the Seed Button
(SDBT) configuration option. SDBT bits 0 to 3 cor-
respond to button inputs S0 to S3. Set the bits
high for the button combination that should trigger
a seed transmission (i.e., If SDBT = 10102 then,
S3+S1 will trigger a seed transmission).
• The seed transmissions before the counter incre-
ments past 128 can be modified with the Seed
Mode (SDMD) configuration option. Setting this
bit for Production mode will cause the selected
seed button combination to first transmit a normal
hopping code word for the selected Minimum
Code words (MTX) and then at least MTX seed
code words until all buttons are released. This
mode is disabled after the counter reaches 128
even if the 16/20-bit counter rolls over to 0.
Seed code words for Encoder 1 and Encoder 2 can be
configured as follows:
• Enabled with the Seed Button Code (SDBT) con-
figuration option, or disabled if SDBT = 00002.
• If the Limited Seed (SDLM) configuration option is
set, seed transmissions will be disabled when the
synchronization counter is bigger than 127. Seed
transmissions remain disabled even if the 16/20-
bit counter rolls over to 0.
• The limit of 127 for SDLM or SDMD can be
reduced by using an initial counter value >0.
• The delay before the seed transmission is sent
can be set to 0.0s, 0.8s, 1.6s and 3.2s with the
Seed Time (SDTM) configuration option. When
SDTM is set to a value other than 0.0s, the
HCS370 will transmit a code hopping transmis-
sion until the selected time expires. After the
selected time expires, the seed code words are
transmitted. This is useful for the decoder to learn
Note: The synchronization counter only incre-
ments on code hopping transmissions.
The counter will not advance on a seed
transmission unless Seed Delay or Pro-
duction mode options are on.
FIGURE 3-3: SEED CODE WORD FORMAT
With QUEN = 1
Open Portion (Not Encrypted)
(9 bits)
SEED Code
(60 bits)
SEED
QUE
CRC VLOW Function
(2 Bits) (2 Bits) (1-Bit) (4 Bits)
Q1 Q0 C1 C0
1
1
1
1
Transmission Direction LSB First
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 13
HCS370
800 µs with the Baud Rate Select (BSEL) configuration
option. The Header time can be set to 4TE or 10TE with
the Header Select (HSEL) configuration option. These
options can all be set individually for Encoder 1 and
Encoder 2.
4.0
4.1
TRANSMITTED WORD
Transmission Modulation Format
The HCS370 transmission is made up of several code
words. Each code word contains a preamble, header,
and data. A code word is separated from another code
word by guard time. The Guard Time Select (GSEL)
configuration option can be set to 0 ms, 6.4 ms, 51.2
ms, or 102.4 ms.
There are four different modulation formats available,
the Modulation Select (MSEL) Configuration Option is
used to select between:
• Pulse Width Modulation (PWM)
• Manchester (MAN)
All other timing specifications for the modulation for-
mats are based on a basic timing element (TE). This
Timing Element can be set to 100 µs, 200 µs, 400 µs or
• Variable Pulse Width Modulation (VPWM)
• Pulse Position Modulation (PPM)
FIGURE 4-1: PULSE WIDTH MODULATION (PWM)
TE
TE
TE
LOGIC "0"
LOGIC "1"
T
BP
1
16
4-10
xTE
Header
31xTE 50% Preamble
Encrypted Portion
Fixed Code Portion
Guard
Time
FIGURE 4-2: MANCHESTER (MAN)
TE
TE
LOGIC "0"
LOGIC "1"
TBP
START bit
bit 0
STOP bit
bit 2
bit 1
1
2
16
4xTE
Header
31xTE 50% Preamble
Guard
Time
Encrypted Portion
Fixed Code Portion
DS41111D-page 14
Preliminary
2002 Microchip Technology Inc.
HCS370
FIGURE 4-3: VARIABLE PULSE WIDTH MODULATION (VPWM)
LOGIC “0”
TE
LOGIC “1”
TE
VPWM BIT ENCODING:
on Transition Low to High
TBP
TBP
2XTE
LOGIC “0”
LOGIC “1”
TE
TE
TE
on Transition High to Low
TBP
TBP
2XTE
1
2
16
Guard
Time
31xTE 50% Preamble
10xTE Header
Encrypted Portion
Fixed Code Portion
FIGURE 4-4: PULSE POSITION MODULATION (PPM)
TE TE TE
LOGIC "0"
LOGIC "1"
TBP
3 X TE
START bit
STOP bit
TBP
1
2
16
31xTE 50% Preamble
10xTE Header
Guard
Time
Encrypted Portion
Fixed Code Portion
In addition to the Modulation Format, Guard Time, and
Baud Rate, the following options are also available to
change the transmission format:
FIGURE 4-5: WAKE-UP ENABLE
TE TE
• If the START/STOP Pulse Enable (STEN) config-
uration option is enabled, the HCS370 will place a
leading and trailing ‘1’ on each code word. This is
necessary for modulation formats such as
Manchester and PPM to interpret the first and last
data bit.
WAKE-UP = 75 ms
TE 2TE
WAKE-UP = 50 ms
• A wake-up sequence can be transmitted before
the transmission starts. The wake-up sequence is
configured with the Wake-up (WAKE) configura-
tion option and can be disabled or set to 50 ms,
75 ms, or 100 ms of pulses as indicated in
Figure 4-5.
TE
5TE
WAKE-UP = 100 ms
• The WAKE option is the same for both Encoder 1
and Encoder 2.
TG
TG
WAKE-UP CODE
Guard Time = 6.4 ms, 51.2 ms, or 102.4 ms
CODE
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 15
HCS370
5.2
RF Enable and PLL Interface
5.0
SPECIAL FEATURES
The RFEN pin will be driven high whenever data is
transmitted through the DATA pin.
5.1
Internal RC Oscillator
The HCS370 has an onboard RC oscillator that con-
trols all the logic output timing characteristics. The
oscillator frequency varies over temperature and volt-
age variances, but stays within ±10% of the tuned
value. All the timing values specified in this document
are subject to this oscillator variation.
The RFEN and DATA outputs also interface with RF
PLL’s. The PLL Interface Select (PLLSEL) configura-
tion option selects between ASK and FSK interfaces.
Figure 5-1 shows the startup sequence for both ASK
and FSK interface options. The RFEN signal will go low
at the end of the last code word, including the guard
time (TG). The power-up time (TPU) is the debounce
time plus the step-up regulator ramp up delay if the
Wait For Step-Up Regulator (WAIT) configuration
option is a ‘1’. The PLL step-up time (TPLL) is also used
to update the EEPROM counter.
FIGURE 5-1: ASK/FSK INTERFACE
S0
SLEEP
VREG
VBAT
STEP
ASK RFEN
CODE WORD
ASK DATA
CODE WORD
FSK RFEN
CODE WORD
FSK DATA
CODE WORD
Wait 2 seconds for next
button if QUEN=1
TPU
TPLL
TG
TE
is set. If LEDBL is set and VDD is low, then the LED will
only flash once. Waveforms of the LED behavior are
shown in Figure 5-2.
5.3
LED Output
The LED pin will be driven low while the HCS370 is
transmitting data. The LED On Time (TLEDON) can be
selected between 50 ms and 100 ms with the LED On
Time Select (LEDOS) configuration option. The LED
Off Time (TLEDOFF) is fixed at 500 ms. When the VDD
voltage drops below the selected VLOW trip point, the
LED will not blink unless the LED Blink (LEDBL) option
For circuits with VDD greater than 3 volts, be sure to
limit the LED circuit with a series resistor. The LED out-
put can safely sink up to 25 mA but adding an external
resistor will conserve battery power. This is an open
drain output but it does have a weak pull-up capable of
driving a CMOS input.
DS41111D-page 16
Preliminary
2002 Microchip Technology Inc.
HCS370
FIGURE 5-2: LED OPERATION
EQUATION 5-1:
CRC Calculation
CRC[1]n + 1 = CRC[0]n Din
SN
TLEDON
TLEDOFF
LED
VDD > VLOW
and
with
CRC[0]n + 1 = (CRC[0]n Din) CRC[1]n
LED
VDD < VLOW
LEDBL=1
CRC[1, 0]0 = 0
and Din the nth transmission bit 0 <=
LED
VDD < VLOW
LEDBL=0
n
<= 64
5.6
Button Queue Information
(QUEUE)
5.4
Step-Up Voltage Regulator
To create your own step-up regulator circuit, first decide
on an output voltage. Second, set the VIN resistor
divider to drop it down to 1.2 volts. Keep the sum of the
The queuing or repeated pressing of the same buttons
can be handled in two ways on the HCS370. This is
controlled with the Queue Counter Enable (QUEN)
configuration option. This option can be different for
Encoder 1 and Encoder 2.
two resistors around 100 kΩ. Third, put your maximum
load on the output and increase the inductance until
COUT charges from 0 volts to your output voltage in
about 30 ms from the minimum input voltage. Finally,
test over your temperature and input voltage ranges.
When the QUEN option is disabled, the device will reg-
ister up to two sequential button presses. In this case,
the device will complete the minimum code words
selected with the MTX option before the second code
word is calculated and transmitted. The code word will
be 67 bits in this case, with no additional queue bits
transmitted.
The WAIT option will delay RF transmissions until
COUT is charged. This permits a trade off in slower but-
ton response times to save money on cheaper induc-
tors. This can also optimize performance for good
batteries and let response times drift for weak batteries.
Also, this option will indicate failure to reach regulation
voltage after 250 ms by not transmitting and not flash-
ing the LED. If WAIT is disabled, the step-up regulator
still operates and transmissions will always start 30 ms
after a button press.
If the QUEN option is enabled, the queue bits are
added to the standard code word. The queue bits are a
2-bit counter that does not wrap. The counter value
starts at 002 and is incremented if a button is pushed
within 2 seconds from the start of the previous button
press. The current code word is terminated when a but-
ton is queued. This allows additional functionality for
double or triple button presses.
The SLEEP Output Enable (SOEN) option can be
enabled if S5 is not used. This reconfigures S5 to be an
output high when the HCS370 is sleeping. S5 will be an
output low when a button press wakes it up. One way
to use this option is to save power on the step-up reg-
ulator. The problem is that the VIN resistor divider
makes a DC path through the inductor and diode to dis-
charge the battery. By tying the bottom of the divider to
SLEEP as shown in Figure 2-1, the path is broken
between transmissions.
FIGURE 5-3: CODE WORD COMPLETION
WITH QUEN SETTINGS
MTX = 012, WAKE > 002
SN
QUEN = Disabled
WAKE-UP
WAKE-UP
CODE2
CODE1
CODE1
CODE2
DATA
5.5
Cyclic Redundancy Check (CRC)
QUEN = Enabled
The CRC bits are calculated on the 65 previously trans-
mitted bits. These bits contain the 32-bit hopping code,
32-bit fixed code, and VLOW bit. The decoder can use
the CRC bits to check the data integrity before process-
ing starts. The CRC can detect all single bit errors and
66% of double bit errors. The CRC is computed as fol-
lows:
WAKE-UP CODE1 00
WAKE-UP
CODE2 01
CODE2 01
DATA
6.0
PROGRAMMING
SPECIFICATIONS
Refer to the “HCS370 Programming Specifications”
document (DS41157) in Microchip Literature.
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 17
HCS370
FIGURE 7-1:
TYPICAL LEARN
SEQUENCE
7.0
INTEGRATING THE HCS370
INTO A SYSTEM
Enter Learn
Use of the HCS370 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 HCS370 and decrypt the
hopping code portion of the data stream. These
routines provide system designers the means to
develop their own decoding system.
Mode
Wait for Reception
of a Valid Code
Generate Key
from Serial Number
Use Generated Key
to Decrypt
7.1
Learning a Transmitter to a
Receiver
Compare Discrimination
Value with Fixed Value
A transmitter must first be ’learned’ by a decoder before
its use is allowed in the system. Several learning strat-
egies are possible. Figure 7-1 details a typical learn
sequence. The decoder must minimally store each
learned transmitter’s serial number and current syn-
chronization counter value in EEPROM. Additionally,
the decoder typically stores each transmitter’s unique
crypt key. The maximum number of learned transmit-
ters will therefore be relative to the available EEPROM.
No
Equal
?
Yes
Wait for Reception
of Second Valid Code
Use Generated Key
to Decrypt
A transmitter’s serial number is transmitted in the 32-bit
fixed code, 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 algo-
rithm is a symmetrical block cipher so the encryption
and decryption keys are identical and referred to gen-
erally as the crypt key. The encoder receives its crypt
key during manufacturing. The decoder typically calcu-
lates the crypt key by running the encoder serial num-
ber or seed through the key generation routine.
Compare Discrimination
Value with Fixed Value
No
Equal
?
Yes
No
Counters
Sequential
?
Figure 7-1 summarizes a typical learn sequence. The
decoder receives and authenticates a first transmis-
sion; first button press. Authentication involves gener-
ating 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 com-
pleted, 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 opera-
tion instead of recalculating it for each transmission
received.
Yes
Learn
Unsuccessful
Learn successful Store:
Serial number
Encryption key
Synchronization counter
Exit
Certain learning strategies have been patented by 3rd
parties and care must be taken not to infringe.
DS41111D-page 18
Preliminary
2002 Microchip Technology Inc.
HCS370
7.2
Decoder Operation
7.3
Synchronization with Decoder
(Evaluating the Counter)
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.
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 win-
dow 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 synchroniza-
tion window.
FIGURE 7-2:
TYPICAL DECODER
OPERATION
Start
No
Transmission
Received
?
Yes
A "Double Operation" (resynchronization) window fur-
ther 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 unsuc-
cessful.
Does
Serial Number
Match
No
?
Yes
Decrypt Transmission
Is
No
Decryption
Valid
?
Yes
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.
Execute
Command
and
Update
Counter
Is
Counter
Within 16
?
Yes
No
No
No
Is
Counter
Within 32K
?
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.
Yes
Save Counter
in Temp Location
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 19
HCS370
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
Single Operation
Window
(16 Codes)
(32K Codes)
receiver more secure it could increment the counter on
questionable code word receptions. To make the trans-
mitter more secure, it could use separate buttons for
lock and unlock functions. Another way would be to
require two different buttons in sequence to gain
access.
7.4
Security Considerations
The strength of this security is based on keeping a
secret inside the transmitter that can be verified by
encrypted transmissions to a trained receiver. The
transmitter’s secret is the manufacturer’s key, not the
encryption algorithm. If that key is compromised then a
smart transceiver can capture any serial number, cre-
ate a valid code word, and trick all receivers trained
with that serial number. The key cannot be read from
the EEPROM without costly die probing but it can be
calculated by brute force decryption attacks on trans-
mitted code words. The cost for these attacks should
exceed what you would want to protect.
There are more ways to make KEELOQ systems more
secure, but they all have trade offs. You need to find a
balance between security, design effort, and usability,
particularly in failure modes. For example, if a button
sticks or kids play with it, the counter should not end up
in the blocked code window rendering the transmitter
useless or requiring retraining.
To protect the security of other receivers with the same
manufacturer’s code, you need to use the random seed
for secure learn. It is a second secret that is unique for
each transmitter. Its transmission on a special button
press combination can be disabled if the receiver has
another way to find it, or limited to the first 127 trans-
missions for the receiver to learn it. This way, it is very
unlikely to ever be captured. Now if a manufacturer’s
key is compromised, clone transmitters can be created,
but without the unique seed they have to be relearned
by the receiver. In the same way if the transmissions
are decrypted by brute force on a computer, the ran-
dom seed hides the manufacturer’s key and prevents
more than one transmitter from being compromised.
The length of the code word at these baud rates makes
brute force attacks that guess the hopping code take
years. To make the receiver less susceptible to this
attack, make sure that you test all the bits in the
decrypted code for the correct value. Do not just test
low counter bits for sync and the bit for the button input
of interest.
The main benefit of hopping codes is to prevent the
retransmission of captured code words. This works
very well for code words that the receiver decodes. Its
weakness is if a code is captured when the receiver
misses it, the code may trick the receiver once if it is
used before the next valid transmission. To make the
DS41111D-page 20
Preliminary
2002 Microchip Technology Inc.
HCS370
8.3
PRO MATE II Universal Device
Programmer
8.0
DEVELOPMENT SUPPORT
®
The KEELOQ family of devices are supported with a
full range of hardware and software development tools:
The PRO MATE II universal device programmer is a
full-featured programmer, capable of operating in
stand-alone mode, as well as PC-hosted mode. The
PRO MATE II device programmer is CE compliant.
• Integrated Development Environment
- MPLAB® IDE Software
- KEELOQ Toolkit Software
The PRO MATE II device programmer has programma-
ble VDD and VPP supplies, which allow it to verify pro-
grammed memory at VDD min and VDD max for
maximum reliability. It has an LCD display for instruc-
tions and error messages, keys to enter commands
and a modular detachable socket assembly to support
various package types.
• Device Programmers
- PRO MATE® II Universal Device Program-
mer
• Low Cost Demonstration Boards
- KEELOQ Evaluation Kit II
- KEELOQ Transponder Evaluation Kit
Microchip has various socket adapter modules avail-
able for PDIP, SOIC and SSOP devices. An In-Circuit
Serial Programming™ (ICSP™) module is also avail-
able for programming devices after circuit assembly.
8.1
MPLAB Integrated Development
Environment Software
The same MPLAB IDE software available at
www.microchip.com that is used for microcontroller
software development also supports the KEELOQ family
of devices. With this Windows®-based application you
can configure the device options in a graphical environ-
ment. The manufacturer’s code is protected by two
custodian keys so that the secret is split and neither
employee can reveal the code alone. Once both custo-
dian keys have been entered and the options selected,
MPLAB IDE software is ready to produce parts in one
of two ways.
8.4
KEELOQ Evaluation Kit II
The KEELOQ Evaluation Kit II contains all the necessary
hardware to evaluate a code hopping system, including
two transmitters and a multi-function receiver board
that supports all HCS5XX stand-alone decoders. Addi-
tionally, it allows the users to develop their own soft-
ware to receive, decode and interpret the KEELOQ
transmission. The included PC software can configure
and program the KEELOQ parts for evaluation
(DM303006).
• The PRO MATE II Programmer, which is sold sep-
arately, can program individual parts. MPLAB IDE
software can automatically increment the serial
number and recalculate the unique encryption
key, discrimination value and seed for each part.
• Creating an SQTPsm file that contains all the indi-
vidual device configurations to submit to Micro-
chip for a production run without revealing your
manufacturer’s code. Please contact Microchip
sales office etc., minimum order quantities apply.
8.5
KEELOQ Transponder Evaluation
Kit
The KEELOQ Transponder Evaluation Kit consists of a
base station, a transmitter/transponder, a battery-less
transponder and various HCS4XX samples. It also
includes the PC software to configure and program the
KEELOQ parts for evaluation (DM303005).
®
8.2
KEELOQ Toolkit Software
®
The KEELOQ Secure Solution CD-ROM is available
free and can be ordered with part number DS40038.
After accepting the KEELOQ license agreement, it will
let you install application notes with complete decoder
algorithms as well as the KEELOQ toolkit. The toolkit is
a handy application that generates encryption keys
from the manufacturer’s code and serial number or
seed. It can also decrypt KEELOQ transmitter’s hopping
code to help debug and test your decoder software.
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 21
HCS370
TABLE 8-1:
DEVELOPMENT TOOLS FROM MICROCHIP
5 1 2 0 P M C
X F X R X C M
X X X H f r C S
X X X H C S
X X C 9 3
/ X X C 2 5
/ X X C 2 4
X
X F X 8 C 1 P I
X X C 8 2 C 1 P I
X X 7 C 7 C 1 P I
X 4 C 7 C 1 P I
X X 9 C 6 C 1 P I
X 8 X 1 6 C I F P
X 8 C 6 C 1 P I
X X 7 C 6 C 1 P I
X 7 C 6 C 1 P I
X 6 2 6 1 F C I P
X X C 6 X C 1 P I
X 6 C 6 C 1 P I
X 5 C 6 C 1 P I
0 0 4 0 1 C I P
X X 2 X C 1 P f I r
X X C 2 X C 1 P I
s o l T e o r a w f t S o s o t r a l
E m r u g g b e e u D s e r m m r a g P r o
t i s a l v K d E a n d s a r o B o m e D
DS41111D-page 22
Preliminary
2002 Microchip Technology Inc.
HCS370
9.0
ELECTRICAL CHARACTERISTICS
9.1
Maximum Ratings*
Ambient temperature under bias.............................................................................................................-40°C to +125°C
Storage temperature .............................................................................................................................. -65°C to +150°C
Voltage on VDD w/respect to VSS ................................................................................................................ -0.3 to +7.5V
Voltage on LED w/respect to VSS ..................................................................................................................-0.3 to +11V
Voltage on all other pins w/respect to VSS ........................................................................................-0.3V to VDD + 0.3V
Total power dissipation (Note 1) ..........................................................................................................................500 mW
Maximum current out of VSS pin ...........................................................................................................................100 mA
Maximum current into VDD pin ..............................................................................................................................100 mA
Input clamp current, IIK (VI < 0 or VI > VDD).........................................................................................................± 20 mA
Output clamp current, IOK (Vo < 0 or Vo >VDD)....................................................................................................± 20 mA
Maximum output current sunk by any Output pin....................................................................................................25 mA
Maximum output current sourced by any Output pin ..............................................................................................25 mA
*Notice: Stresses above those listed under “Maximum ratings” may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at those or any other conditions above those indicated in the
operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may
affect device reliability.
Note 1: Power dissipation is calculated as follows: Pdis=VDD x {IDD - Â IOH} + Â {(VDD-VOH) x IOH} + Â(VOl x IOL).
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 23
HCS370
TABLE 9-1:
DC CHARACTERISTICS: HCS370
DC Characteristics
All Pins Except
Power Supply Pins
Standard Operating Conditions (unless otherwise stated)
Operating Temperature 0°C ≤ TA ≤ +70°C (Commercial)
-40°C ≤ TA ≤ +85°C (Industrial)
Param
Sym.
No.
Characteristic
Supply Voltage
Min.
Typ.†
Max.
Units
Conditions
D001
VDD
2.05(4)
—
5.5
—
V
V
D003
VPOR
VDD start voltage to ensure
internal Power-on Reset
signal
—
VSS
Cold RESET
D004
SVDD
VDD rise rate to ensure
internal Power-on Reset
signal
0.05*
—
—
V/ms
D005
D010
VBOR
IDD
Brown-out Reset Voltage
Supply Current(2)
—
—
1.9
1.0
2
5
V
mA
FOSC = 4 MHz,
VDD = 5.5V(3)
D010B
2.0
1.0
mA
FOSC = 4 MHz,
VDD = 3.5V(3)
D021A IPD
Shutdown Current
—
0.1
µA
VDD = 5.5V
Input Low Voltage
Input pins
VIL
D030
D030A
D031
D032
With TTL Buffer
VSS
VSS
VSS
VSS
—
—
—
—
0.8
V
V
V
V
4.5V ≤ VDD ≤ 5.5V
0.15 VDD
0.2 VDD
0.2 VDD
Otherwise
With Schmitt Trigger Buffer
SHIFT
Input High Voltage
Input pins
VIH
—
D040
D040A
With TTL Buffer
2.0
(0.25 VDD
+0.8)
—
—
VDD
VDD
V
V
4.5V ≤ VDD ≤ 5.5V
Otherwise
D041
D042
With Schmitt Trigger Buffer
SHIFT
0.8 VDD
0.8 VDD
—
—
VDD
VDD
V
V
Input Threshold Voltage
D050
D051
D052
VTH
VTH
VIN
SHIFT
0.4
0.3
—
0.6
1.2
0.9
V
V
V
2.05 ≤ VDD ≤ 3.5V
2.05 ≤ VDD ≤ 3.5V
Data Internally Inverted
SLEEP/S5
VIN
1.05
1.19
1.33
D053 Vtol
Vlow detect tolerance
—
—
—
—
+200
+350
mV
mV
setting 5 = 2.25V
setting 25 = 4.25V
Input Leakage Current
D060
IIL
Input pins
—
—
—
—
±1
±5
µA
µA
VSS ≤ VPIN ≤ VDD, Pin at Hi-
impedance, no pull-downs
enabled
D061
SHIFT
VSS ≤ VPIN ≤ VDD
DS41111D-page 24
Preliminary
2002 Microchip Technology Inc.
HCS370
TABLE 9-1:
DC CHARACTERISTICS: HCS370 (CONTINUED)
DC Characteristics
All Pins Except
Power Supply Pins
Standard Operating Conditions (unless otherwise stated)
Operating Temperature 0°C ≤ TA ≤ +70°C (Commercial)
-40°C ≤ TA ≤ +85°C (Industrial)
Param
Sym.
No.
Characteristic
Min.
Typ.†
Max.
Units
Conditions
Output Low Voltage
D080
VOL
Output pins
—
—
0.6
V
IOL = 8.5 mA, VDD = 4.5V
Output High Voltage
D090
D091
VOH
VOH
Output pins
LED
VDD-0.7
—
—
—
—
V
V
IOH = -3.0 mA, VDD = 4.5V
IOH = -0.5 mA, VDD = 4.5V
1.5
Internal Pull-down Resistance
D100 Rpd S0 - S5, SHIFT
Data EEPROM Memory
40
75
100
KOhms If enabled
D120
ED
Endurance
200K
2.05
—
1000K
—
5.5
10
E/W
V
25°C at 5V
D121 Vdrw
D122 Tdew
VDD for Read/Write
Erase/Write Cycle Time(1)
—
4
ms
Note 1: * These parameters are characterized but not tested.
2: † "Typ" column data is at 5.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are
not tested.
3: The supply current is mainly a function of the operating voltage and frequency. Other factors such as I/O pin loading
and switching rate, oscillator type, internal code execution pattern, and temperature also have an impact on the current
consumption.
4: Should operate down to VBOR but not tested below 2.0V.
The test conditions for all IDD measurements in active Operation mode are: all I/O pins tristated, pulled to VDD. MCLR = VDD; WDT
enabled/disabled as specified. The power-down/shutdown current in SLEEP mode does not depend on the oscillator frequency. Power-
down current is measured with the part in SLEEP mode, with all I/O pins in hi-impedance state and tied to VDD or VSS. The ∆ current is
the additional current consumed when the WDT is enabled. This current should be added to the base IDD or IPD measurement.
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 25
HCS370
TABLE 9-2:
AC CHARACTERISTICS
Commercial (C): TAMB = 0°C to +70°C
Industrial (I):
TAMB = -40°C to +85°C
2.05V < VDD < 5.5
Parameter
Sym.
Min.
Typ.(1)
Max.
Unit Conditions
Timing Element
TE
90
—
880
µs BSEL = 002 (min) or
BSEL = 012
BSEL = 102
BSEL = 112 (max)
Power-up Time
TPU
—
25
—
ms
PLL Set-up Time
TPLL
10
—
15
—
30
285
ms WAIT = 0
ms WAIT = 1
LED On Time
TLEDON
45
—
110
ms LEDOS = 0 (min) or
LEDOS = 1 (max)
LED Off Time
Guard Time
TLEDOFF
TG
450
500
550
ms
1.8
5.6
2TE
6.4
112.6
7.0
ms GSEL = 002(min)
ms GSEL = 012
46.1
96.1
51.2
102.4
56.3
42.6
ms GSEL = 102
ms GSEL = 112(max)
Note 1: All timing values are subject to the oscillator variance. These parameters are characterized but not tested.
DS41111D-page 26
Preliminary
2002 Microchip Technology Inc.
HCS370
10.0 PACKAGING INFORMATION
10.1 Package Marking Information
14-Lead PDIP (300 mil)
Example
HCS370
XXXXXXXXXXXXXX
XXXXXXXXXXXXXX
XXXXXXXXXXXXXX
YYWWNNN
9904NNN
14-Lead SOIC (150 mil)
Example
HCS370
XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
9904NNN
YYWWNNN
Example
14-Lead TSSOP (4.4 mm)
XXXXXX
HCS370
9904
YYWW
NNN
NNN
Legend: XX...X Customer specific information*
YY
Year code (last 2 digits of calendar year)
WW
NNN
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Note: 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 marking consists of Microchip part number, year code, week code, facility code, mask rev#,
and assembly code. For marking beyond this, certain price adders apply. Please check with your
Microchip Sales Office. For SQTP devices, any special marking adders are included in SQTP price.
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 27
HCS370
10.2 Package Details
14-Lead Plastic Dual In-line (P) – 300 mil (PDIP)
E1
D
2
n
1
a
E
A2
A
L
c
A1
B1
b
eB
p
B
Units
INCHES*
NOM
MILLIMETERS
Dimension Limits
MIN
MAX
MIN
NOM
14
MAX
n
p
Number of Pins
Pitch
14
.100
.155
.130
2.54
Top to Seating Plane
A
.140
.170
3.56
2.92
0.38
7.62
6.10
18.80
3.18
0.20
1.14
0.36
7.87
5
3.94
3.30
4.32
Molded Package Thickness
Base to Seating Plane
Shoulder to Shoulder Width
Molded Package Width
Overall Length
A2
A1
E
.115
.015
.300
.240
.740
.125
.008
.045
.014
.310
5
.145
3.68
.313
.250
.750
.130
.012
.058
.018
.370
10
.325
.260
.760
.135
.015
.070
.022
.430
15
7.94
6.35
19.05
3.30
0.29
1.46
0.46
9.40
10
8.26
6.60
19.30
3.43
0.38
1.78
0.56
10.92
15
E1
D
Tip to Seating Plane
Lead Thickness
L
c
Upper Lead Width
B1
B
Lower Lead Width
Overall Row Spacing
Mold Draft Angle Top
Mold Draft Angle Bottom
§
eB
a
b
5
10
15
5
10
15
* Controlling Parameter
§ Significant Characteristic
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. C04-005
DS41111D-page 28
Preliminary
2002 Microchip Technology Inc.
HCS370
14-Lead Plastic Small Outline (SL) – Narrow, 150 mil (SOIC)
E
E1
p
D
2
B
n
1
a
h
45
×
c
A2
A
f
A1
L
b
Units
INCHES*
NOM
MILLIMETERS
Dimension Limits
MIN
MAX
MIN
NOM
14
MAX
n
p
Number of Pins
Pitch
14
.050
.061
.056
.007
.236
.154
.342
.015
.033
4
1.27
Overall Height
A
.053
.069
1.35
1.32
1.55
1.42
0.18
5.99
3.90
8.69
0.38
0.84
4
1.75
1.55
0.25
6.20
3.99
8.81
0.51
1.27
8
Molded Package Thickness
Standoff
A2
A1
E
.052
.004
.228
.150
.337
.010
.016
0
.061
.010
.244
.157
.347
.020
.050
8
§
0.10
5.79
3.81
8.56
0.25
0.41
0
Overall Width
Molded Package Width
Overall Length
E1
D
h
Chamfer Distance
Foot Length
L
f
Foot Angle
c
Lead Thickness
Lead Width
.008
.014
0
.009
.017
12
.010
.020
15
0.20
0.36
0
0.23
0.42
12
0.25
0.51
15
B
a
Mold Draft Angle Top
Mold Draft Angle Bottom
b
0
12
15
0
12
15
* Controlling Parameter
§ Significant Characteristic
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. C04-065
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 29
HCS370
14-Lead Plastic Thin Shrink Small Outline (ST) – 4.4 mm (TSSOP)
E
E1
p
D
2
1
n
B
a
A
c
f
A1
A2
b
L
Units
INCHES
NOM
MILLIMETERS*
Dimension Limits
MIN
MAX
MIN
NOM
14
MAX
n
p
Number of Pins
Pitch
14
.026
0.65
Overall Height
A
.043
1.10
0.95
0.15
6.50
4.50
5.10
0.70
8
Molded Package Thickness
Standoff
A2
A1
E
.033
.002
.246
.169
.193
.020
0
.035
.004
.251
.173
.197
.024
4
.037
.006
.256
.177
.201
.028
8
0.85
0.05
0.90
0.10
6.38
4.40
5.00
0.60
4
§
Overall Width
6.25
4.30
4.90
0.50
0
Molded Package Width
Molded Package Length
Foot Length
E1
D
L
f
Foot Angle
c
Lead Thickness
.004
.007
0
.006
.010
5
.008
.012
10
0.09
0.19
0
0.15
0.25
5
0.20
0.30
10
Lead Width
B1
a
Mold Draft Angle Top
Mold Draft Angle Bottom
b
0
5
10
0
5
10
* Controlling Parameter
§ Significant Characteristic
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.005” (0.127mm) per side.
JEDEC Equivalent: MO-153
Drawing No. C04-087
DS41111D-page 30
Preliminary
2002 Microchip Technology Inc.
HCS370
Systems Information and Upgrade Hot Line
ON-LINE SUPPORT
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:
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.
1-800-755-2345 for U.S. and most of Canada, and
1-480-792-7302 for the rest of the world.
ConnectingtotheMicrochipInternetWebSite
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 ser-
vice 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 vari-
ety 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
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 31
HCS370
READER RESPONSE
It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip prod-
uct. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation
can better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-7578.
Please list the following information, and use this outline to provide us with your comments about this Data Sheet.
To:
Technical Publications Manager
Reader Response
Total Pages Sent
RE:
From:
Name
Company
Address
City / State / ZIP / Country
Telephone: (_______) _________ - _________
FAX: (______) _________ - _________
Application (optional):
Would you like a reply?
Y
N
Literature Number:
DS41111D
Device:
HCS370
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?
DS41111D-page 32
Preliminary
2002 Microchip Technology Inc.
HCS370
11.0 HCS370 PRODUCT IDENTIFICATION SYSTEM
.To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
Device
X
/XX
XXX
Temperature Package
Range
Pattern
Device
HCS370: Code Hopping Encoder
HCS370T: Code Hopping Encoder (Tape and Reel - SL
only)
Temperature Range
-
=
0×C to +70×C
I
=
-40×C to +85×C
Package
P
SL
ST
=
=
=
Plastice DIP (300 mil body), 14-lead
Plastic SOIC (150 mil body), 14-lead
Plastic TSSOP (4.4mm body), 14-lead
Pattern
* JW Devices are UV erasable and can be programmed to any device configuration. JW Devices meet the electrical requirement of
each oscillator type.
Sales and Support
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. 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.
2002 Microchip Technology Inc.
Preliminary
DS41111D-page 33
HCS370
NOTES:
DS41111D-page 34
Preliminary
2002 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 com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, FilterLab,
KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER,
PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
nology Incorporated in the U.S.A. and other countries.
dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, 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.
© 2002, 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.
2002 Microchip Technology Inc.
Preliminary
DS41111D - page 35
WORLDWIDE SALES AND SERVICE
Japan
AMERICAS
ASIA/PACIFIC
Microchip Technology Japan K.K.
Benex S-1 6F
3-18-20, Shinyokohama
Kohoku-Ku, Yokohama-shi
Kanagawa, 222-0033, Japan
Tel: 81-45-471- 6166 Fax: 81-45-471-6122
Corporate Office
Australia
2355 West Chandler Blvd.
Microchip Technology Australia Pty Ltd
Suite 22, 41 Rawson Street
Epping 2121, NSW
Chandler, AZ 85224-6199
Tel: 480-792-7200 Fax: 480-792-7277
Technical Support: 480-792-7627
Web Address: http://www.microchip.com
Australia
Tel: 61-2-9868-6733 Fax: 61-2-9868-6755
Korea
Rocky Mountain
China - Beijing
Microchip Technology Korea
168-1, Youngbo Bldg. 3 Floor
Samsung-Dong, Kangnam-Ku
Seoul, Korea 135-882
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7966 Fax: 480-792-7456
Microchip Technology Consulting (Shanghai)
Co., Ltd., Beijing Liaison Office
Unit 915
Bei Hai Wan Tai Bldg.
Atlanta
500 Sugar Mill Road, Suite 200B
Atlanta, GA 30350
Tel: 82-2-554-7200 Fax: 82-2-558-5934
No. 6 Chaoyangmen Beidajie
Beijing, 100027, No. China
Tel: 86-10-85282100 Fax: 86-10-85282104
Singapore
Microchip Technology Singapore Pte Ltd.
200 Middle Road
#07-02 Prime Centre
Singapore, 188980
Tel: 65-6334-8870 Fax: 65-6334-8850
Taiwan
Microchip Technology Taiwan
11F-3, No. 207
Tung Hua North Road
Taipei, 105, Taiwan
Tel: 770-640-0034 Fax: 770-640-0307
China - Chengdu
Boston
Microchip Technology Consulting (Shanghai)
Co., Ltd., Chengdu Liaison Office
Rm. 2401, 24th Floor,
Ming Xing Financial Tower
No. 88 TIDU Street
Chengdu 610016, China
Tel: 86-28-6766200 Fax: 86-28-6766599
China - Fuzhou
Microchip Technology Consulting (Shanghai)
Co., Ltd., Fuzhou Liaison Office
Unit 28F, World Trade Plaza
No. 71 Wusi Road
Fuzhou 350001, China
Tel: 86-591-7503506 Fax: 86-591-7503521
China - Shanghai
Microchip Technology Consulting (Shanghai)
Co., Ltd.
Room 701, Bldg. B
Far East International Plaza
No. 317 Xian Xia Road
Shanghai, 200051
Tel: 86-21-6275-5700 Fax: 86-21-6275-5060
China - Shenzhen
Microchip Technology Consulting (Shanghai)
Co., Ltd., Shenzhen Liaison Office
Rm. 1315, 13/F, Shenzhen Kerry Centre,
Renminnan Lu
Shenzhen 518001, China
Tel: 86-755-2350361 Fax: 86-755-2366086
2 Lan Drive, Suite 120
Westford, MA 01886
Tel: 978-692-3848 Fax: 978-692-3821
Chicago
333 Pierce Road, Suite 180
Itasca, IL 60143
Tel: 630-285-0071 Fax: 630-285-0075
Dallas
4570 Westgrove Drive, Suite 160
Addison, TX 75001
Tel: 972-818-7423 Fax: 972-818-2924
Tel: 886-2-2717-7175 Fax: 886-2-2545-0139
EUROPE
Denmark
Microchip Technology Nordic ApS
Regus Business Centre
Lautrup hoj 1-3
Ballerup DK-2750 Denmark
Tel: 45 4420 9895 Fax: 45 4420 9910
Detroit
Tri-Atria Office Building
32255 Northwestern Highway, Suite 190
Farmington Hills, MI 48334
Tel: 248-538-2250 Fax: 248-538-2260
Kokomo
France
2767 S. Albright Road
Kokomo, Indiana 46902
Tel: 765-864-8360 Fax: 765-864-8387
Los Angeles
Microchip Technology SARL
Parc d’Activite du Moulin de Massy
43 Rue du Saule Trapu
Batiment A - ler Etage
91300 Massy, France
Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79
18201 Von Karman, Suite 1090
Irvine, CA 92612
Tel: 949-263-1888 Fax: 949-263-1338
Germany
New York
150 Motor Parkway, Suite 202
Hauppauge, NY 11788
Microchip Technology GmbH
Gustav-Heinemann Ring 125
D-81739 Munich, Germany
Tel: 49-89-627-144 0 Fax: 49-89-627-144-44
Tel: 631-273-5305 Fax: 631-273-5335
San Jose
Hong Kong
Italy
Microchip Technology Inc.
2107 North First Street, Suite 590
San Jose, CA 95131
Microchip Technology Hongkong Ltd.
Unit 901-6, Tower 2, Metroplaza
223 Hing Fong Road
Kwai Fong, N.T., Hong Kong
Tel: 852-2401-1200 Fax: 852-2401-3431
Microchip Technology SRL
Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
Tel: 408-436-7950 Fax: 408-436-7955
Toronto
Milan, Italy
Tel: 39-039-65791-1 Fax: 39-039-6899883
6285 Northam Drive, Suite 108
Mississauga, Ontario L4V 1X5, Canada
Tel: 905-673-0699 Fax: 905-673-6509
India
Microchip Technology Inc.
India Liaison Office
United Kingdom
Arizona Microchip Technology Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Divyasree Chambers
1 Floor, Wing A (A3/A4)
No. 11, O’Shaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
03/01/02
DS41111D-page 36
Preliminary
2002 Microchip Technology Inc.
相关型号：
©2020 ICPDF网 联系我们和版权申明