HCS320-I/SN Microchip Technology, HCS320-I/SN Datasheet

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... Button inputs have internal pull-down resistors • Current limiting on LED output • Low external component cost Typical Applications The HCS320 is ideal for Remote Keyless Entry (RKE) applications. These applications include: • Automotive RKE systems • Automotive alarm systems • Automotive immobilizers • ...

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... The encoder portion of a keyless entry system is integrated into a transmitter, carried by the user and operated to gain access to a vehicle or restricted area. The HCS320 is meant cost-effective yet secure solution to such systems, requiring very few external components (Figure 2-1). ...

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... As indicated in the block diagram on page one, the HCS320 has a small EEPROM array which must be loaded with several parameters before use; most often programmed by the manufacturer at the time of produc- tion. The most important of these are: • ...

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... HCS320 FIGURE 1-2: BUILDING THE TRANSMITTED CODE WORD (ENCODER) EEPROM Array Crypt Key Sync Counter Serial Number FIGURE 1-3: BASIC OPERATION OF RECEIVER (DECODER) 1 Received Information Button Press Serial Number Information Check for 2 Match Perform Function Indicated by 5 button press NOTE: Circled numbers indicate the order of execution. ...

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... DEVICE OPERATION As shown in the typical application circuits (Figure 2-1), the HCS320 is a simple device to use. It requires only the addition of buttons and RF circuitry for use as the transmitter in your security application. A description of each pin is described in Table 2-1. FIGURE 2-1: TYPICAL CIRCUITS +12V ...

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... Stop DS41097C-page 6 3.0 EEPROM MEMORY ORGANIZATION The HCS320 contains 192 bits (12 x 16-bit words) of EEPROM memory (Table 3-1). This EEPROM array is used to store the encryption key information, synchronization value, etc. Further descriptions of the memory array is given in the following sections. TABLE 3-1: ...

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... Auto-shutoff timer is enabled, and a zero in the Most Significant bit will disable the timer. The length of the timer is not selectable. 2001 Microchip Technology Inc. HCS320 3.5 CONFIG (Configuration Word) The Configuration Word is a 16-bit word stored in EEPROM array that is used by the device to store infor- mation used during the encryption process, as well as the status of option configurations ...

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... LOW VOLTAGE TRIP POINT SELECT The low voltage trip point select bit is used to tell the HCS320 what V will be used by the device to determine when to send the voltage low signal to the receiver. When this bit is set to a one, the V from a 9.0 volt or 12.0 volt V ...

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... TRANSMITTED WORD 4.1 Code Word Format The HCS320 code word is made up of several parts (Figure 4-1). Each code word contains a 50% duty cycle preamble, a header, 32 bits of encrypted data and 34 bits of fixed data followed by a guard period before another code word can begin. Refer to Table 8-3 for code word timing ...

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... HCS320 4.3 Synchronous Transmission Mode Synchronous Transmission mode can be used to clock the code word out using an external clock. To enter Synchronous Transmission mode, the Pro- gramming mode start-up sequence must be executed as shown in Figure 4-3. If either set on the falling edge of S2, the device enters Synchronous Transmission mode ...

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... Code word completion is an automatic feature that makes sure that the entire code word is transmitted, even if the transmit button is released before the trans- mission is complete. The HCS320 encoder powers itself up when a button is pushed and powers itself down after the command is finished, if the user has already released the button ...

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... HCS320 5.6 Blank Alternate Code Word Federal Communications Commission (FCC) part 15 rules specify the limits on fundamental power and harmonics that can be transmitted. Power is calcu- lated on the worst case average power transmitted in a 100 ms window therefore advantageous to minimize the duty cycle of the transmitted word. This can be achieved by minimizing the duty cycle of the individual bits and by blanking out consecutive words ...

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... SHIFT Key Operation The HCS320 has four switch inputs usually connected to buttons as shown in Figure 2-1: Typical Circuits. Any button connected to input S0 called a TRANSMIT button as it causes a transmission when pressed. The SHIFT button is connected to the SHIFT input. Pressing the SHIFT button increments a counter by one count and does not result in a transmission ...

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... HCS320 6.0 PROGRAMMING THE HCS320 When using the HCS320 in a system, the user will have to program some parameters into the device including the serial number and the secret key before it can be used. The programming cycle allows the user to input all 192 bits in a serial data stream, which are then stored internally in EEPROM ...

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... Data hold time Data out valid time Note 1: Typical values - not tested in production. 2001 Microchip Technology Inc. Min 4.0 PBW T 4.0 PROG CLKL T 50 CLKH — DV HCS320 Max. Units 4.5 ms — ms — s — ms — ms — ms — s — s — (1) s — ( (1) s DS41097C-page 15 ...

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... HCS320 7.0 INTEGRATING THE HCS320 INTO A SYSTEM Use of the HCS320 in a system requires a compatible decoder. This decoder is typically a microcontroller with compatible firmware. Microchip will provide (via a license agreement) firmware routines that accept transmissions from the HCS320 and decrypt the hopping code portion of the data stream. These routines provide system designers the means to develop their own decoding system ...

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... This window excludes previously used, perhaps code-grabbed transmissions from accessing the system. Note: The synchronization method described in this section is only a typical implementation and because it is usually implemented in firmware, it can be altered to fit the needs of a particular system. HCS320 technology patent scope includes a DS41097C-page 17 ...

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... HCS320 FIGURE 7-3: SYNCHRONIZATION WINDOW Entire Window rotates to eliminate use of previously used codes DS41097C-page 18 Blocked Window (32K Codes) Stored Synchronization Counter Value Double Operation (resynchronization) Single Operation Window Window (32K Codes) (16 Codes) 2001 Microchip Technology Inc. ...

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... Industrial(I):Tamb = -40°C to +85°C 3.5V < V < 13.0V DD Min Typ* Max Unit 0.6 1.0 2.0 3.0 mA 10 0.3 -0 5.0 6.5 9 120 160 K HCS320 Units 0 °C (Note) °C (Note) V Conditions 13.0V DD (Figure 8- 6. 13. 4. 4.0V IN DS41097C-page 19 ...

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... HCS320 FIGURE 8-1: TYPICAL ICC CURVE OF HCS320 12.0 10.0 8.0 6.0 4.0 2.0 0 DS41097C-page [V] BAT LEGEND Typical Maximum Minimum 2001 Microchip Technology Inc. ...

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... Multiple Code Word Transmission Code Code Code Word Word Word Symbol Min Code 27 + Code BP Word Time Word Time Encrypted Portion Fixed Portion of Header of Transmission Transmission HOP HCS320 Code Code Word Word Max Unit Remarks ms (Note (Note 2) Guard Time T T FIX G DS41097C-page 21 ...

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... HCS320 FIGURE 8-5: CODE WORD FORMAT: PREAMBLE/HEADER PORTION 50% Duty Cycle Preamble E FIGURE 8-6: CODE WORD FORMAT: DATA PORTION LSB MSB Bit 0 Bit 1 Bit 30 Bit 31 Bit 32 Bit 33 Bit 58 Bit 59 Header Encrypted Portion TABLE 8-3: CODE WORD TRANSMISSION TIMING REQUIREMENTS V = +3.5 to 13.0 DD Commercial(C):Tamb = 0°C to +70°C Industrial(I):Tamb = -40° ...

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... FIGURE 8-7: HCS320 TE VS. TEMP (BY CHARACTERIZATION ONLY) 1.7 1.6 1.5 1.4 1.3 1.2 TE 1.1 1.0 0.9 0.8 0.7 0.6 -50 -40 -30 -20 - 2001 Microchip Technology Inc. T Max 3. 5. Max 5.0V DD Typical Min. E TEMPERATURE HCS320 DS41097C-page 23 ...

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... HCS320 9.0 PACKAGING INFORMATION 9.1 Package Marking Information 8-Lead PDIP (300 mil) XXXXXXXX XXXXXNNN YYWW 8-Lead SOIC (150 mil) XXXXXXX XXXYYWW NNN Legend: XX...X Customer specific information* Y Year code (last digit of calendar year) YY Year code (last 2 digits of calendar year) WW Week code (week of January 1 is week ‘01’) ...

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... L .125 .130 .135 c .008 .012 .015 B1 .045 .058 .070 B .014 .018 .022 § eB .310 .370 .430 HCS320 MILLIMETERS MIN NOM MAX 8 2.54 3.56 3.94 4.32 2.92 3.30 3.68 0.38 7.62 7.94 8.26 6.10 6.35 6.60 9.14 9.46 9.78 3.18 3.30 3 ...

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... HCS320 8-Lead Plastic Small Outline (SN) - Narrow, 150 mil (SOIC Dimension Limits 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 ...

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... Microchip Products • Conferences for products, Development Systems, technical information and more • Listing of seminars and events 2001 Microchip Technology Inc. HCS320 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 ...

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... Telephone: (_______) _________ - _________ Application (optional): Would you like a reply? Y Device: HCS320 Questions: 1. What are the best features of this document? 2. How does this document meet your hardware and software development needs you find the organization of this data sheet easy to follow? If not, why? 4 ...

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... HCS320 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. HCS320 - /P Package: Temperature Range: Device: Sales and Support Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds ...

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... HCS320 NOTES: DS41097C-page 30 2001 Microchip Technology Inc. ...

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... Serialized Quick Turn Programming (SQTP service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2001, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received QS-9000 quality system ...

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... 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 Singapore Microchip Technology Singapore Pte Ltd. 200 Middle Road #07-02 Prime Centre Singapore, 188980 Tel: 65-334-8870 Fax: 65-334-8850 Taiwan Microchip Technology Taiwan 11F-3, No. 207 ...