 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| HCS512 KEELOQ(R) Code Hopping Decoder FEATURES Security * * * * * Secure storage of Manufacturer's Code Secure storage of transmitter's keys Up to four transmitters can be learned KEELOQ(R) code hopping technology Normal and secure learning mechanisms DESCRIPTION The Microchip Technology Inc. HCS512 is a code hopping decoder designed for secure Remote Keyless Entry (RKE) systems. The HCS512 utilizes the patented KEELOQ code hopping system and high security learning mechanisms to make this a canned solution when used with the HCS encoders to implement a unidirectional remote keyless entry system. Operating * * * * * 4.0V - 6.0V operation 4 MHz external RC oscillator Learning indication on LRNOUT Auto baud rate detection Power saving SLEEP mode PACKAGE TYPE PDIP, SOIC LRNIN LRNOUT NC MCLR GND S0 S1 S2 1 2 3 4 5 6 7 8 9 HCS512 18 17 16 15 14 13 12 11 10 RFIN NC OSCIN OSCOUT VDD DATA CLK SLEEP VLOW Other * * * * Stand-alone decoder On-chip EEPROM for transmitter storage Four binary function outputs-15 functions 18-pin DIP/SOIC package Typical Applications * * * * * * * Automotive remote entry systems Automotive alarm systems Automotive immobilizers Gate and garage openers Electronic door locks Identity tokens Burglar alarm systems S3 BLOCK DIAGRAM RFIN Reception Register DECRYPTOR EEPROM CONTROL DATA CLK LRNIN Compatible Encoders All KEELOQ encoders and transponders configured for the following setting: * * * * * * * PWM modulation format (1/3-2/3) TE in the range from 100 s to 400 s 10 x TE Header 28-bit Serial Number 16-bit Synchronization counter Discrimination bits equal to Serial Number 8 LSbs 66- to 69-bit length code word. OSCIN OSCILLATOR MCLR SLEEP OUTPUT S0 S1 S2 S3 CONTROL VLOW LRNOUT The Manufacturer's Code, transmitter keys, and synchronization information are stored in protected onchip EEPROM. The HCS512 uses the DATA and CLK inputs to load the Manufacturer's Code which cannot be read out of the device. (c) 2002 Microchip Technology Inc. DS40151D-page 1 HCS512 The HCS512 operates over a wide voltage range of 3.0 volts to 6.0 volts. The decoder employs automatic baud rate detection which allows it to compensate for wide variations in transmitter data rate. The decoder contains sophisticated error checking algorithms to ensure only valid codes are accepted. 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. 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 8-2). * 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 8-1). * Transmission - A data stream consisting of repeating code words (Figure 8-1). * 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 1.1 HCS Encoder Overview The HCS encoders have a small EEPROM array which must be loaded with several parameters before use. The most important of these values are: * A crypt key that is generated at the time of production * A 16-bit synchronization counter value * A 28-bit serial number which is meant to be unique for every encoder The manufacturer programs the serial number for each encoder at the time of production, while the `Key Generation Algorithm' generates the crypt key (Figure 1-1). Inputs to the key generation algorithm typically consist of the encoder's serial number and a 64-bit manufacturer's code, which the manufacturer creates. Note: The manufacturer code is a pivotal part of the system's overall security. Consequently, all possible precautions must be taken and maintained for this code. DS40151D-page 2 (c) 2002 Microchip Technology Inc. HCS512 FIGURE 1-1: Production Programmer CREATION AND STORAGE OF CRYPT KEY DURING PRODUCTION HCS512 EEPROM Array Serial Number Crypt Key Sync Counter Transmitter Serial Number Manufacturer's Code Key Generation Algorithm Crypt Key . . . 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 8.2. 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 HCS512 based transmitter. Section 5.0 provides detail on integrating the HCS512 into a system. 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 1-3 shows the relationship between some of the values stored by the receiver and the values received from the transmitter. FIGURE 1-2: EEPROM Array Crypt Key Sync Counter Serial Number BUILDING THE TRANSMITTED CODE WORD (ENCODER) KEELOQ Encryption Algorithm Button Press Information Serial Number 32 Bits Encrypted Data Transmitted Information (c) 2002 Microchip Technology Inc. DS40151D-page 3 HCS512 FIGURE 1-3: BASIC OPERATION OF RECEIVER (DECODER) 1 Received Information EEPROM Array Button Press Information Serial Number 32 Bits of Encrypted Data Manufacturer Code 2 Check for Match Serial Number Sync Counter Crypt Key 3 KEELOQ Decryption Algorithm Perform Function 5 Indicated by button press Decrypted Synchronization Counter 4 Check for Match NOTE: Circled numbers indicate the order of execution. 2.0 PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 PIN ASSIGNMENT Decoder Function LRNIN LRNOUT NC MCLR Ground S0 S1 S2 S3 VLOW SLEEP CLK DATA VDD OSCOUT (1MHZ) OSCIN (4MHz) NC RFIN I/O (1) I O -- I P O O O O O I I/O I/O P O I -- I Buffer Type(1) TTL TTL TTL ST -- TTL TTL TTL TTL TTL TTL TTL/ST -- TTL ST -- TTL RF input from receiver (2) Description Learn input - initiates learning, 10K pull-up required on input Learn output - indicates learning Do not connect Master clear input Ground connection Switch 0 Switch 1 Switch 2 Switch 3 Battery low indication output Connect to RFIN to allow wake-up from SLEEP Clock in Programming mode and Synchronous mode Data in Programming mode and Synchronous mode Power connection Oscillator out (test point) Oscillator in - recommended values 4.7 k and 22 pF TTL/ST (2) Note 1: P = power, I = in, O = out, and ST = Schmitt Trigger input. 2: Pin 12 and Pin 13 have a dual purpose. After RESET, these pins are used to determine if Programming mode is selected in which case they are the clock and data lines. In normal operation, they are the clock and data lines of the synchronous data output stream. DS40151D-page 4 (c) 2002 Microchip Technology Inc. HCS512 3.0 3.1 DESCRIPTION OF FUNCTIONS Parallel Interface The HCS512 activates the S3, S2, S1 & S0 outputs when a new valid code is received. The outputs will be activated for approximately 500 ms. If a repeated code is received during this time, the output extends for approximately 500 ms. A special status message is transmitted on the second pass of learn. This allows the controlling microcontroller to determine if the learn was successful (Result = 1) and if a previous transmitter was overwritten (Overwrite = 1). The status message is shown in Figure 3-2. Table 3-1 show the values for TX1:0 and the number of transmitters learned. TABLE 3-1: TX1 0 0 1 1 STATUS BITS TX0 0 1 0 1 Number of Transmitters One Two Three Four 3.2 Serial Interface The decoder has a PWM/Synchronous interface connection to microcontrollers with limited I/O. An output data stream is generated when a valid transmission is received. The data stream consists of one START bit, four function bits, one bit for battery status, one bit to indicate a repeated transmission, two status bits, and one STOP bit. (Table 3-1). The DATA and CLK lines are used to send a synchronous event message. FIGURE 3-1: START DATA OUTPUT FORMAT S3 S2 S1 S0 VLOW REPEAT TX1 TX0 STOP FIGURE 3-2: START STATUS MESSAGE FORMAT 0 0 0 0 RESULT OVRWR TX1 TX0 STOP A 1-wire PWM or 2-wire synchronous interface can be used. In 1-wire mode, the data is transmitted as a PWM signal with a basic pulse width of 400 s. In 2-wire mode, Synchronous mode PWM bits start on the rising edge of the clock, and the bits must be sampled on the falling edge. The START bit is a `1' and the STOP bit is `0'. FIGURE 3-2: PWM OUTPUT FORMAT(1) 1/31/3 1/3 LOGIC "1" LOGIC "0" 600 s 1200 s CLK DATA START 1200 s S3 S2 S1 S0 VLOW RPT Reserved Reserved STOP Note: The Decoder output PWM format logic ("1" / "0") is reversed with respect of the Encoder modulation format. (c) 2002 Microchip Technology Inc. DS40151D-page 5 HCS512 4.0 4.1 DECODER OPERATION Learning a Transmitter to a Receiver The following checks are performed on the decoder to determine if the transmission is valid during learn: * * * * The first code word is checked for bit integrity. The second code word is checked for bit integrity. The hopping code is decrypted. If all the checks pass, the serial number and synchronization counters are stored in EEPROM memory. Either the serial number-based learning method or the seed-based learning method can be selected. The learning method is selected in the configuration byte. In order for a transmitter to be used with a decoder, the transmitter must first be `learned'. When a transmitter is learned to a decoder, the decoder stores the crypt key, a check value of the serial number and current synchronization value in EEPROM. The decoder must keep track of these values for every transmitter that is learned. The maximum number of transmitters that can be learned is four. The decoder must also contain the Manufacturer's Code in order to learn a transmitter. The Manufacturer's Code will typically be the same for all decoders in a system. The HCS512 has four memory slots. After an "erase all" procedure, all the memory slots will be cleared. Erase all is activated by taking LRNIN low for approximately 10 seconds. When a new transmitter is learned, the decoder searches for an empty memory slot and stores the transmitter's information in that memory slot. When all memory slots are full, the decoder randomly overwrites existing transmitters. Figure 4-1 shows a flow chart of the learn sequence. FIGURE 4-1: LEARN SEQUENCE Enter Learn Mode Wait for Reception of a Valid Code Wait for Reception of Second Non-Repeated Valid Code Generate Key from Serial Number or Seed Value Use Generated Key to Decrypt Compare Discrimination Value with Serial Number 4.1.1 LEARNING PROCEDURE Learning is activated by taking the LRNIN input low for longer than 64 ms. This input requires an external pullup resistor. To learn a new transmitter to the HCS512 decoder, the following sequence is required: 1. Enter Learning mode by pulling LRNIN low for longer than 64 ms. The LRNOUT output will go high. Activate the transmitter until the LRNOUT output goes low indicating reception of a valid code (hopping message). Activate the transmitter a second time until the LRNOUT toggles for 4 seconds (in Secure Learning mode, the seed transmission must be transmitted during the second stage of learn by activating the appropriate buttons on the transmitter). If LRNIN is taken low momentarily during the learn status indication, the indication will be terminated. Once a successful learning sequence is detected, the indication can be terminated allowing quick learning in a manufacturing setup. The transmitter is now learned into the decoder. Repeat steps 1-4 to learn up to four transmitters. Learning will be terminated if two non-sequential codes were received or if two acceptable codes were not decoded within 30 seconds. Equal ? Yes No 2. Learn successful. Store: Serial number check value Synchronization counter crypt key Learn Unsuccessful 3. Exit 4. 5. 6. DS40151D-page 6 (c) 2002 Microchip Technology Inc. HCS512 4.2 Validation of Codes FIGURE 4-2: DECODER OPERATION Start The decoder waits for a transmission and checks the serial number to determine if the transmitter has been learned. If learned, the decoder decrypts the encrypted portion of the transmission using the crypt key. It uses the discrimination bits to determine if the decryption was valid. If everything up to this point is valid, the synchronization value is evaluated. No Transmission Received ? Yes No Does Ser # Check Val Match ? Yes Decrypt Transmission Is Decryption Valid ? Yes Is Counter Within 16 ? No No Is Counter Within 32K ? Yes Save Counter in Temp Location Yes Execute Command and Update Counter 4.3 Validation Steps Validation consists of the following steps: * Search EEPROM to find the Serial Number Check Value Match * Decrypt the Hopping Code * Compare the 10 bits of discrimination value with the lower 10 bits of serial number * Check if the synchronization counter falls within the first synchronization window. * Check if the synchronization counter falls within the second synchronization window. * If a valid transmission is found, update the synchronization counter, else use the next transmitter block and repeat the tests. No (c) 2002 Microchip Technology Inc. DS40151D-page 7 HCS512 4.4 Synchronization with Decoder (Evaluating the Counter) 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. 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. 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 4-3 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 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. FIGURE 4-3: 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) Single Operation Window (16 Codes) 4.5 SLEEP Mode The SLEEP mode of the HCS512 is used to reduce current consumption when no RF input signal is present. SLEEP mode will only be effective in systems where the RF receiver is relatively quiet when no signal is present. During SLEEP, the clock stops, thereby significantly reducing the operating current. SLEEP mode is enabled by the SLEEP bit in the configuration byte. The HCS512 will enter SLEEP mode when: * The RF line is low * After a function output is switched off * Learn mode is terminated (time-out reached) The device will not enter SLEEP mode when: * A function output is active * Learn sequence active * Device is in Programming mode The device will wake-up from SLEEP when: * The SLEEP input pin changes state * The CLOCK line changes state Note: During SLEEP mode the CLK line will change from an output line to an input line that can be used to wake-up the device. Connect CLK to LRNIN via a 100K resistor to reliably enter the Learn mode whenever SLEEP mode is active. DS40151D-page 8 (c) 2002 Microchip Technology Inc. HCS512 5.0 INTEGRATING THE HCS512 INTO A SYSTEM 6.0 DECODER PROGRAMMING The PG306001 production programmer will allow easy setup and programming of the configuration byte and the manufacturer's code. The HCS512 can act as a stand-alone decoder or be interfaced to a microcontroller. Typical stand-alone applications include garage door openers and electronic door locks. In stand-alone applications, the HCS512 will handle learning, reception, decryption, and validation of the received code; and generate the appropriate output. For a garage door opener, the HCS512 input will be connected to an RF receiver, and the output, to a relay driver to connect a motor controller. Typical systems where the HCS512 will be connected to a microcontroller include vehicle and home security systems. The HCS512 input will be connected to an RF receiver and the function outputs to the microcontroller. The HCS512 will handle all the decoding functions and the microcontroller, all the system functions. The Serial Output mode with a 1- or 2-wire interface can be used if the microcontroller is I/O limited. 6.1 Configuration Byte The configuration byte is used to set system configuration for the decoder. The LRN bits determine which algorithm (Decrypt or XOR) is used for the key generation. SC_LRN determines whether normal learn (key derived from serial number) or secure learn (key derived from seed value) is used. TABLE 6-1: Bit 0 1 2 3 4 5 6 7 Name LRN0 LRN1 SC_LRN SLEEP RES1 RES2 RES3 RES4 CONFIGURATION BYTE Description Learn algorithm select Not used Secure Learn enable (1 = enabled) SLEEP enable (1 = enabled) Not used Not used Not used Not used TABLE 6-2: LRN0 0 1 LEARN METHOD LRN0, LRN1 DEFINITIONS Description Decrypt algorithm XOR algorithm (c) 2002 Microchip Technology Inc. DS40151D-page 9 HCS512 6.2 Programming the Manufacturer's Code 6.4 Checksum The checksum is used by the HCS512 to check that the data downloaded was correctly received before programming the data. The checksum is calculated so that the 10 bytes added together (discarding the overflow bits) is zero. The checksum can be calculated by adding the first 9 bytes of data together and subtracting the result from zero. Throughout the calculation the overflow is discarded. Given a manufacturer's code of 0123456789ABCDEF16 and a Configuration Word of 116, the checksum is calculated as shown in Figure 6-1. The checksum is 3F16. The manufacturer's code must be programmed into EEPROM memory through the synchronous programming interface using the DATA and CLK lines. Provision must be made for connections to these pins if the decoder is going to be programmed in circuit. Programming mode is activated if the CLK is low for at least 1 ms and then goes high within 64 ms after powerup, stays high for longer than 8 ms but not longer than 128 ms. After entering Programming mode the 64-bit manufacturer's code, 8-bit configuration byte, and 8-bit checksum is sent to the device using the synchronous interface. After receiving the 80-bit message the checksum is verified and the information is written to EEPROM. If the programming operation was successful, the HCS512 will respond with an Acknowledge pulse. After programming the manufacturer's code, the HCS512 decoder will automatically activate an Erase All function, removing all transmitters from the system. 6.5 Test Transmitter The HCS512 decoder will automatically add a test transmitter each time an Erase All Function is done. A test transmitter is defined as a transmitter with a serial number of zero. After an Erase All, the test transmitter will always work without learning and will not check the synchronization counter of the transmitter. Learning of any new transmitters will erase the test transmitter. Note 1: A transmitter with a serial number of zero cannot be learned. Learn will fail after the first transmission. 2: Always learn at least one transmitter after an Erase All sequence. This ensures that the test transmitter is erased. 6.3 Download Format The manufacturer's code and configuration byte must be downloaded Least Significant Byte, Least Significant bit first as shown in Table 6-3. TABLE 6-3: Byte 9 Checksum Byte 8 Config Byte 7 Man Key_7 Byte 6 Man Key_6 Byte 5 Man Key_5 Byte 4 Man Key_4 Byte 3 Man Key_3 DOWNLOAD DATA Byte 2 Man Key_2 Byte 1 Man Key_1 Byte 0 Man Key_0 Byte 0, right-most bit downloaded first. FIGURE 6-1: CHECKSUM CALCULATION 0116 + 2316 = 246 2416 + 4516 = 6916 6916 + 6716 = D016 D016 + 8916 = 15916 5916 + AB16 = 10416 (Carry is discarded) 0416 + CD16 = D116 (Carry is discarded) D116 + EF16 = 1C016 C016 + 116 = C116 (Carry is discarded) (FF16 - C116) + 116 = 3F16 DS40151D-page 10 (c) 2002 Microchip Technology Inc. HCS512 FIGURE 6-2: PROGRAMMING WAVEFORMS MCLR TPS CLK (Clock) TPH1 TPH2 TCKL TCKH TACK TACKH DAT (Data) Bit0 Bit1 Bit78 Bit79 Ack Enter Program Mode 80-bit Data Package Acknowledge pulse TABLE 6-4: PROGRAMMING TIMING REQUIREMENTS Symbol TPS TPH1 TPH2 TCKH TCKL TACK TACKH Min. 1 8 0.05 0.05 0.050 -- 1 Max. 64 128 320 320 320 80 -- Units ms ms ms ms ms ms ms Parameter Program mode setup time Hold time 1 Hold time 2 Clock High Time Clock Low Time Acknowledge Time Acknowledge duration Note: FOSC equals 4 MHz. (c) 2002 Microchip Technology Inc. DS40151D-page 11 HCS512 7.0 KEY GENERATION SCHEMES The HCS512 decoder has two key generation schemes. Normal learning uses the transmitter's serial number to derive two input seeds which are used as inputs to the key generation algorithm. Secure learning uses the seed transmission to derive the two input seeds. Two key generation algorithms are available to convert the inputs seeds to secret keys. The appropriate scheme is selected in the Configuration Word. FIGURE 7-1: Serial Number Patched Manufacturer's Key Key Generation Algorithms ------------------Decrypt XOR Encoder Key Seed 7.1 Normal Learning (Serial Number Derived) The two input seeds are composed from the serial number in two ways, depending on the encoder type. The encoder type is determined from the number of bits in the incoming transmission. SourceH is used to calculate the upper 32 bits of the crypt key, and SourceL, for the lower 32 bits. For 28-bit serial number encoders (66 / 67-bit transmissions): SourceH = 6H + 28 bit Serial Number SourceL = 2H + 28 bit Serial Number 7.2 Secure Learning (Seed Derived) The two input seeds are composed from the seed value that is transmitted during secure learning. The lower 32 bits of the seed transmission is used to compose the lower seed, and the upper 32 bits, for the upper seed. The upper 4 bits (function code) are set to zero. For 32-bit seed encoders: SourceH = Serial Number Lower 28 bits (with upper 4 bits always zero) SourceL = Seed 32 bits For 48-bit seed encoders: SourceH = Seed Upper 16 bits + Serial Number Upper 16 bits (with upper 4 bits always zero) << 16 SourceL = Seed Lower 32 bits For 60-bit seed encoders: SourceH = Seed Upper 28 bits (with upper 4 bits always zero) SourceL = Seed Lower 32 bits DS40151D-page 12 (c) 2002 Microchip Technology Inc. HCS512 7.3 Key Generation Algorithms There are two key generation algorithms implemented in the HCS512 decoder. The KEELOQ decryption algorithm provides a higher level of security than the XOR algorithm. Section 6.1 describes the selection of the algorithms in the configuration byte. 7.3.1 KEELOQ DECRYPT ALGORITHM This algorithm uses the KEELOQ decryption algorithm and the manufacturer's code to derive the crypt key as follows: Key Upper 32 bits = Decrypt (SourceH) 64 Bit Manufacturers Code Key Lower 32 bits = Decrypt (SourceL) 64 Bit Manufacturers Code 7.3.2 XOR WITH THE MANUFACTURER'S CODE The two 32-bits seeds are XOR with the manufacturer's code to form the 64 bit crypt key. Key Upper 32 bits = SourceH XOR Manufacturers Code Upper 32 bits Key Lower 32 bits = SourceL XOR Manufacturers Code Lower 32 bits After programming the manufacturer's code, the HCS512 decoder will automatically activate an Erase All function, removing all transmitters from the system. If LRNIN is taken low momentarily during the learn status indication, the indication will be terminated. Once a successful learning sequence is detected, the indication can be terminated, allowing quick learning in a manufacturing setup. FIGURE 7-2: HCS512 KEY GENERATION Normal Learn (SC_LRN = 0) LRN0 = 0 LS 32 bits of crypt key Padding 2 Padding 6 28-bit Serial Number KEELOQ Decryption Algorithm 28-bit Serial Number MS 32 bits of crypt key Secure Learn (SC_LRN = 1) LS 32 bits of Seed Transmission Padding 0000b LRN0 = 0 LS 32 bits of crypt key KEELOQ Decryption Algorithm MS 28 bits of Seed Transmission MS 32 bits of crypt key Secure Learn XOR (SC_LRN = 1) LS 32 bits of Seed Transmission LRN0 = 1 LS 32 bits of crypt key XOR Padding 0000b MS 28 bits of Seed Transmission MS 32 bits of crypt key (c) 2002 Microchip Technology Inc. DS40151D-page 13 HCS512 8.0 8.1 KEELOQ ENCODERS Transmission Format (PWM) and the 28-bit serial number. The encrypted and nonencrypted combined sections increase the number of combinations to 7.38 x 1019. The KEELOQ encoder transmission is made up of several parts (Figure 8-1). Each transmission begins with a preamble and a header, followed by the encrypted and then the fixed data. The actual data is 66/69 bits which consists of 32 bits of encrypted data and 34/37 bits of non-encrypted data. Each transmission is followed by a guard period before another transmission can begin. The encrypted portion provides up to four billion changing code combinations and includes the button status bits (based on which buttons were activated) along with the synchronization counter value and some discrimination bits. The non-encrypted portion is comprised of the status bits, the function bits, 8.2 Code Word Organization The HCSXXX encoder transmits a 66/69-bit code word when a button is pressed. The 66/69-bit word is constructed from an encryption portion and a nonencrypted code portion (Figure 8-2). The Encrypted Data is generated from four button bits, two overflow counter bits, ten discrimination bits, and the 16-bit synchronization value. The Non-encrypted Data is made up from 2 status bits, 4 function bits, and the 28/32-bit serial number. FIGURE 8-1: TRANSMISSION FORMAT (PWM) TE LOGIC "0" LOGIC "1" TBP TE TE 50% Preamble 10xTE Header Encrypted Portion Fixed Code Portion Guard Time FIGURE 8-2: CODE WORD ORGANIZATION 34 bits of Fixed Portion 32 bits of Encrypted Portion Button Status S2 S1 S0 S3 OVR (2 bits) DISC (10 bits) Sync Counter (16 bits) LSb Repeat VLOW (1-bit) (1-bit) MSb Button Status S2 S1 S0 S3 Serial Number (28 bits) 66 Data bits Transmitted LSb first. Repeat VLOW (1-bit) (1-bit) Button Status 1 111 Serial Number (28 bits) SEED (32 bits) MSb LSb SEED replaces Encrypted Portion when all button inputs are activated at the same time. DS40151D-page 14 (c) 2002 Microchip Technology Inc. HCS512 9.0 ELECTRICAL CHARACTERISTICS FOR HCS512 Absolute Maximum Ratings Ambient temperature under bias.............................................................................................................-55C to +125C Storage temperature ...............................................................................................................................-65C to +150C Voltage on any pin with respect to VSS (except VDD) ............................................................................ -0.6V to VDD +0.6V Voltage on VDD with respect to Vss....................................................................................................................0 to +7.5V Total power dissipation (Note 1) ..........................................................................................................................800 mW Maximum current out of VSS pin.............................................................................................................................150 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 I/O pin..........................................................................................................25 mA Maximum output current sourced by any I/O pin ....................................................................................................20 mA Note: Power dissipation is calculated as follows: Pdis = VDD x {IDD - IOH} + {(VDD-VOH) x IOH} + (VOl x IOL) NOTICE: Stresses above those listed under "Absolute 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 operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. (c) 2002 Microchip Technology Inc. DS40151D-page 15 HCS512 TABLE 9-1: DC CHARACTERISTICS Standard Operating Conditions (unless otherwise stated) Operating temperature Commercial (C): 0C TA +70C for commercial Industrial (I): -40C TA +85C for industrial Symbol VDD VPOR SVDD IDD Characteristic Supply Voltage VDD start voltage to ensure RESET VDD rise rate to ensure RESET Supply Current Min 4.0 -- 0.05* -- -- VSS 0.48 VDD -- VDD-0.7 Typ() -- VSS -- 1.8 7.3 15 -- -- -- -- Max 6.0 -- -- 4.5 10 32 0.16 VDD VDD 0.6 -- Units V V V/ms mA mA A V V V V FOSC = 4 MHz, VDD = 5.5V (During EEPROM programming) In SLEEP mode except MCLR = 0.2 VDD except MCLR = 0.85 VDD IOL = 8.5 mA, VDD = 4.5V IOH = -3.0 mA, VDD = 4.5V Conditions VIL VIH VOL VOH Input Low Voltage Input High Voltage Output Low Voltage Output High Voltage Data in "Typ" column is at 5.0V, 25C unless otherwise stated. These parameters are for design guidance only and are not tested. * These parameters are characterized but not tested. Note: Negative current is defined as coming out of the pin. TABLE 9-2: Symbol FOSC AC CHARACTERISTICS Characteristic Oscillator frequency PWM elemental pulse width Output delay Min 2.7 65 Typ 4 -- -- 90 500 50 32 -- 150 Max 6.21 1080 1080 115 740 74 -- -- 222 Units MHz s s ms ms ms ms ns ms Conditions REXT = 10K, CEXT = 10 pF 4.5V < VDD < 5.5V Oscillator components tolerance < 6%. 3V < VDD < 6V Oscillator components tolerance <10% TE 130 70 322 32 21 150 -- TOD TA TRPT TLRN TMCLR TOV * Output activation time REPEAT activation time LRNIN activation time low time MCLR Time output valid These parameters are characterized but not tested. FIGURE 9-1: RESET WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP TIMER TIMING VDD MCLR TMCLR TOV I/O Pins DS40151D-page 16 (c) 2002 Microchip Technology Inc. (c) 2002 Microchip Technology Inc. DS40151D-page 17 FIGURE 9-2: 1 Code Word 50 ms OUTPUT ACTIVATION RFIN TOD S[3,2,1,0] TA VLOW TA Note 1 Note 2 LRNOUT 0s 1s 2s 3s 4s 5s HCS512 Note 1: Output is activated as long as code is received. 2: Output is activated if battery low (VLOW) is detected. DS40151D-page 18 (c) 2002 Microchip Technology Inc. FIGURE 9-3: HCS512 LM7805 MCP100-450 VDD VDD VO 100 F 12V GND 1 2 3 VI 1N4004/7 100 F G N D TYPICAL DECODER APPLICATION CIRCUIT LOW VOLTAGE DETECTOR--DO NOT OMIT VI G N D VO POWER SUPPLY 10K VDD 1 RECEIVE DATA INPUT 1K 1K LRNOUT S0 S1 S2 S3 VLOW 4.7K P2 14 4 MCLR 3 NC 16 OSCIN 15 1K 17 18 1 2 1K 1K 1K V D D NC RFIN LRNIN LRNOUT S0 S1 S2 S3 OSCOUT G 22 pF HCS512 N D 6 7 8 9 VLOW 10 SLEEP 11 CLK 12 DAT 13 VDD 10K P4 P3 DATA CLOCK RESET GND P4 P3 P2 P1 5 100K LEARN BUTTON In-Circuit Programming Pads HCS512 10.0 10.1 PACKAGING INFORMATION Package Marking Information Example HCS512 0110017 Example HCS512 /SO 0110017 18-Lead PDIP (300 mil) XXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXX YYWWNNN 18-Lead SOIC (300 mil) XXXXXXXXXXXX XXXXXXXXXXXX XXXXXXXXXXXX YYWWNNN Legend: 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 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 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. (c) 2002 Microchip Technology Inc. DS40151D-page 19 HCS512 10.2 Package Details 18-Lead Plastic Dual In-line (P) - 300 mil (PDIP) E1 D 2 n 1 E A2 A L A1 B1 c eB Units Dimension Limits n p B p MIN Number of Pins Pitch Top to Seating Plane A .140 .170 Molded Package Thickness A2 .115 .145 Base to Seating Plane A1 .015 Shoulder to Shoulder Width E .300 .313 .325 Molded Package Width E1 .240 .250 .260 Overall Length D .890 .898 .905 Tip to Seating Plane L .125 .130 .135 c Lead Thickness .008 .012 .015 Upper Lead Width B1 .045 .058 .070 Lower Lead Width B .014 .018 .022 Overall Row Spacing eB .310 .370 .430 Mold Draft Angle Top 5 10 15 Mold Draft Angle Bottom 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. C04-007 INCHES* NOM 18 .100 .155 .130 MAX MIN MILLIMETERS NOM 18 2.54 3.56 3.94 2.92 3.30 0.38 7.62 7.94 6.10 6.35 22.61 22.80 3.18 3.30 0.20 0.29 1.14 1.46 0.36 0.46 7.87 9.40 5 10 5 10 MAX 4.32 3.68 8.26 6.60 22.99 3.43 0.38 1.78 0.56 10.92 15 15 DS40151D-page 20 (c) 2002 Microchip Technology Inc. HCS512 18-Lead Plastic Small Outline (SO) - Wide, 300 mil (SOIC) E p E1 D 2 B n 1 h 45 c A A2 L A1 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 Units Dimension Limits n p A A2 A1 E E1 D h L c B MIN .093 .088 .004 .394 .291 .446 .010 .016 0 .009 .014 0 0 INCHES* NOM 18 .050 .099 .091 .008 .407 .295 .454 .020 .033 4 .011 .017 12 12 MAX MIN .104 .094 .012 .420 .299 .462 .029 .050 8 .012 .020 15 15 MILLIMETERS NOM 18 1.27 2.36 2.50 2.24 2.31 0.10 0.20 10.01 10.34 7.39 7.49 11.33 11.53 0.25 0.50 0.41 0.84 0 4 0.23 0.27 0.36 0.42 0 12 0 12 MAX 2.64 2.39 0.30 10.67 7.59 11.73 0.74 1.27 8 0.30 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-013 Drawing No. C04-051 (c) 2002 Microchip Technology Inc. DS40151D-page 21 HCS512 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. 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. Connecting to the Microchip Internet Web Site 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 DS40151D-page 22 (c) 2002 Microchip Technology Inc. HCS512 READER RESPONSE It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip product. 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) 792-4150. Please list the following information, and use this outline to provide us with your comments about this Data Sheet. To: RE: Technical Publications Manager Reader Response Total Pages Sent From: Name Company Address City / State / ZIP / Country Telephone: (_______) _________ - _________ Application (optional): Would you like a reply? Device: HCS512 Questions: 1. What are the best features of this document? Y N Literature Number: DS40151D FAX: (______) _________ - _________ 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? (c) 2002 Microchip Technology Inc. DS40151D-page 23 HCS512 HCS512 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. HCS512 -- /P Package: Temperature Range: Device: P = Plastic DIP (300 mil Body), 18-lead SO = Plastic SOIC (300 mil Body), 18-lead Blank = 0C to +70C I = -40C to +85C HCS512 HCS512T Code Hopping Decoder Code Hopping Decoder (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. DS40151D-page 24 (c) 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 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. (c) 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(R) 8-bit MCUs, KEELOQ(R) 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. (c) 2002 Microchip Technology Inc. DS40151D - page 25 WORLDWIDE SALES AND SERVICE AMERICAS Corporate Office 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: 480-792-7627 Web Address: http://www.microchip.com ASIA/PACIFIC Australia Microchip Technology Australia Pty Ltd Suite 22, 41 Rawson Street Epping 2121, NSW Australia Tel: 61-2-9868-6733 Fax: 61-2-9868-6755 Japan 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 Rocky Mountain 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7966 Fax: 480-792-7456 China - Beijing Microchip Technology Consulting (Shanghai) Co., Ltd., Beijing Liaison Office Unit 915 Bei Hai Wan Tai Bldg. No. 6 Chaoyangmen Beidajie Beijing, 100027, No. China Tel: 86-10-85282100 Fax: 86-10-85282104 Korea Microchip Technology Korea 168-1, Youngbo Bldg. 3 Floor Samsung-Dong, Kangnam-Ku Seoul, Korea 135-882 Tel: 82-2-554-7200 Fax: 82-2-558-5934 Atlanta 500 Sugar Mill Road, Suite 200B Atlanta, GA 30350 Tel: 770-640-0034 Fax: 770-640-0307 Singapore Microchip Technology Singapore Pte Ltd. 200 Middle Road #07-02 Prime Centre Singapore, 188980 Tel: 65-334-8870 Fax: 65-334-8850 Boston 2 Lan Drive, Suite 120 Westford, MA 01886 Tel: 978-692-3848 Fax: 978-692-3821 China - Chengdu 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 Taiwan Microchip Technology Taiwan 11F-3, No. 207 Tung Hua North Road Taipei, 105, Taiwan Tel: 886-2-2717-7175 Fax: 886-2-2545-0139 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 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 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 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 Kokomo 2767 S. Albright Road Kokomo, Indiana 46902 Tel: 765-864-8360 Fax: 765-864-8387 France 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 Los Angeles 18201 Von Karman, Suite 1090 Irvine, CA 92612 Tel: 949-263-1888 Fax: 949-263-1338 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 New York 150 Motor Parkway, Suite 202 Hauppauge, NY 11788 Tel: 631-273-5305 Fax: 631-273-5335 Germany Microchip Technology GmbH Gustav-Heinemann Ring 125 D-81739 Munich, Germany Tel: 49-89-627-144 0 Fax: 49-89-627-144-44 San Jose Microchip Technology Inc. 2107 North First Street, Suite 590 San Jose, CA 95131 Tel: 408-436-7950 Fax: 408-436-7955 Hong Kong 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 Italy Microchip Technology SRL Centro Direzionale Colleoni Palazzo Taurus 1 V. Le Colleoni 1 20041 Agrate Brianza Milan, Italy Tel: 39-039-65791-1 Fax: 39-039-6899883 Toronto 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 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 United Kingdom Arizona Microchip Technology Ltd. 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44 118 921 5869 Fax: 44-118 921-5820 01/18/02 DS40151D-page 26 (c) 2002 Microchip Technology Inc. |
Price & Availability of HCS51202
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |