HCS201-I/SN Microchip Technology, HCS201-I/SN Datasheet

Page 1

... Remote Keyless Entry (RKE) systems. The HCS201 utilizes the K code hopping technology, incorporating high security, a small package outline and low cost. The HCS201 is a perfect solution for unidirectional remote keyless entry systems and access control systems. ...

Page 2

... 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 HCS201 is meant cost-effective yet secure solution to such systems, requiring very few external components (Figure 2-1). ...

Page 3

... As indicated in the block diagram on page one, the HCS201 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: • ...

Page 4

... HCS201 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. ...

Page 5

... ENCODER OPERATION As shown in the typical application circuits (Figure 2-1), the HCS201 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 given in Table 2-1. FIGURE 2-1: TYPICAL CIRCUITS V DD ...

Page 6

... Stop DS41098C-page 6 3.0 EEPROM MEMORY ORGANIZATION The HCS201 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, synchro- nization value, etc. Further descriptions of the memory array is given in the following sections. TABLE 3-1: ...

Page 7

... Not Used 15 Not Used 3.7.1 OSCILLATOR TUNING BITS (OSC0 AND OSC3) These bits are used to tune the frequency of the HCS201 internal clock oscillator to within ±10% of its nominal value over temperature and voltage. 3.7.2 LOW VOLTAGE TRIP POINT SELECT (V ) LOWS The low voltage trip point select bit (V ...

Page 8

... MINIMUM FOUR TRANSMISSIONS (MTX4) If this bit is cleared, only one code is completed if the HCS201 is activated. If this bit is set, at least four com- plete code words are transmitted, even if code word blanking is enabled. 3.7.5 TRANSMIT PULSE ENABLE (TXEN) If this bit is cleared, no transmission pulse is transmit- ted before a transmission ...

Page 9

... TRANSMITTED WORD 4.1 Code Word Format The HCS201 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 8-4 for code word timing ...

Page 10

... HCS201 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 (or S3), the device enters Synchro- nous Transmission mode ...

Page 11

... BACW effectively halves the RF on time for a given transmission so the RF out- put power could theoretically be doubled while main- taining the same time averaged output power. Code Word Code Word Code Word Time HCS201 PIN ACTIVATION TABLE Function ...

Page 12

... HCS201 5.6 Step Up Regulator The integrated Step Up regulator can be used to ensure the power supply voltage to the encoder and the RF circuit ( constant independent of what DD the battery voltage Input on V DDB pared the internal reference voltage STEP falls below this voltage the STEP output is pulsed at f ...

Page 13

... PROGRAMMING THE HCS201 When using the HCS201 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 ...

Page 14

... HCS201 TABLE 6-1: PROGRAMMING/VERIFY TIMING REQUIREMENTS V = 5.0V ± 10 ± Parameter Symbol Program mode setup time Hold time 1 Hold time 2 Bulk Write time Program delay time Program cycle time Clock low time Clock high time Data setup time Data hold time Data out valid time ...

Page 15

... INTEGRATING THE HCS201 INTO A SYSTEM Use of the HCS201 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 HCS201 and decrypt the hopping code portion of the data stream. These routines provide system designers the means to develop their own decoding system ...

Page 16

... HCS201 7.2 Decoder Operation 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 ...

Page 17

... FIGURE 7-3: SYNCHRONIZATION WINDOW Entire Window rotates to eliminate use of previously used codes 2001 Microchip Technology Inc. Blocked Window (32K Codes) Stored Synchronization Counter Value Double Operation (resynchronization) Single Operation Window Window (32K Codes) (16 Codes) HCS201 DS41098C-page 17 ...

Page 18

... HCS201 8.0 ELECTRICAL CHARACTERISTICS TABLE 8-1: ABSOLUTE MAXIMUM RATINGS Symbol V Supply voltage Output voltage OUT I Max output current OUT T Storage temperature STG T Lead soldering temp LSOL Note 1: Stresses above those listed under “ABSOLUTE MAXIMUM RATINGS” may cause permanent damage to the device. ...

Page 19

... Microchip Technology Inc. Multiple Code Word Transmission Code Code Code Word Word Word (2) Min. Typ Code Word 4.5 Encrypted Portion Fixed Portion of Header of Transmission Transmission HOP HCS201 Code Code Word Word Max. Unit Conditions 26 + Code ms (Note 1) Word Guard Time T T FIX G DS41098C-page 19 ...

Page 20

... HCS201 FIGURE 8-3: CODE WORD FORMAT: PREAMBLE/HEADER PORTION 50% Duty Cycle Preamble E FIGURE 8-4: CODE WORD FORMAT: DATA PORTION (XSER=0) LSB MSB Bit 0 Bit 1 Bit 30 Bit 31 Bit 32 Bit 33 Bit 58 Bit 59 Header Encrypted Portion TABLE 8-4: CODE WORD TRANSMISSION TIMING REQUIREMENTS V = +3.5 to 6.0V ...

Page 21

... For OTP 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. 2001 Microchip Technology Inc. HCS201 Example HCS201 XXXXXNNN 0025 Example HCS201 XXX0025 NNN DS41098C-page 21 ...

Page 22

... HCS201 9.2 Package Details 8-Lead Plastic Dual In-line (P) – 300 mil (PDIP Dimension Limits Number of Pins Pitch Top to Seating Plane Molded Package Thickness Base to Seating Plane Shoulder to Shoulder Width Molded Package Width Overall Length Tip to Seating Plane Lead Thickness Upper Lead Width ...

Page 23

... L .019 .025 .030 .008 .009 .010 B .013 .017 .020 HCS201 A2 MILLIMETERS MIN NOM MAX 8 1.27 1.35 1.55 1.75 1.32 1.42 1.55 0.10 0.18 0.25 5.79 6.02 6.20 3.71 3.91 3.99 4.80 4.90 5.00 0.25 0.38 ...

Page 24

... HCS201 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 ...

Page 25

... 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? 2001 Microchip Technology Inc. Total Pages Sent FAX: (______) _________ - _________ N Literature Number: DS41098C HCS201 DS41098C-page 25 ...

Page 26

... HCS201 NOTES: DS41098C-page 26 2001 Microchip Technology Inc. ...

Page 27

... 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 ...

Page 28

... 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 ...