hcs361 Microchip Technology Inc., hcs361 Datasheet
hcs361
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hcs361 Summary of contents
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... Two seed transmission methods • PWM and VPWM modulation • Wake-up signal in VPWM mode • IR Modulation mode Typical Applications The HCS361 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 HCS361 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 HCS361 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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... HCS361 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 HCS361 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 LED S1 S2 ...
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... HCS361 3.0 EEPROM MEMORY ORGANIZATION The HCS361 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: EEPROM MEMORY MAP WORD ...
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... In PWM mode, this bit selects the bit format. If TXWAK = 0, the PWM pulse duty cycle is 1/3-2/3. If TXWAK = 1, the PWM pulse duty cycle is 1/6-2/6. 2002 Microchip Technology Inc. HCS361 In VPWM mode, this bit enables the wake-up signal. If TXWAK = 0, transmissions start normally with the preamble portion of the code word. ...
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... DS40146E-page 8 3.5.8 DISCRIMINATION VALUE While in other K selectable, the HCS361 uses directly the 8 Least Sig- nificant bits of the Serial Number as part of the infor- mation that form the encrypted portion of the transmission (Figure 3-2). power (see The discrimination value aids the post-decryption check on the decoder end. After the receiver has ...
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... SEED_1 Data transmission direction 16-bit Data Word SER_0 Encrypted Data Data transmission direction SEED_2 SEED_1 Data transmission direction TABLE 3-4: SYNCHRONOUS COUNTER INITIALIZATION VALUES Synchronous Counter Values 0000H 0060H 0050H 0048H HCS361 SEED_0 16-bit Counter Encrypt SEED_0 Number of Transmissions 128 DS40146E-page 9 ...
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... HCS361 3.5.12 DELM: DELAY MODE If DELM = 1, delay transmission is enabled. A delayed transmission is indicated by inverting the lower nibble of the discrimination value. The Delay mode is primarily for compatibility with previous TABLE 3-1: TYPICAL DELAY TIMES TXWAK BSEL 3.5.13 TIMO: TIME-OUT OR AUTO-SHUTOFF If TIMO = 1, the time-out is enabled ...
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... If SEED = 1, transmit seed after delay SEED = 1, transmit seed immediately ( ( ( (1) B HCS361 IR MODULATION Basic Pulse (400 s) (16x) Period = 25 s (200 s) (8x) (100 s) (4x) Comments (1) (1) DS40146E-page 11 ...
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... E DS40146E-page 12 4.2 Code Word Organization The HCS361 transmits a 67-bit code word when a but- ton is pressed. The 67-bit word is constructed from a Fixed Code portion and an Encrypted Code portion (Figure 3-2). The Encrypted Data is generated from 4 function bits, 2 user bits, overflow bit, Independent mode bit, and 8 serial number bits, and the 16-bit synchronization value (Figure 8-4) ...
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... LOGIC Transition High to Low SPM=1 SPM=0 10xT Header Encrypted Portion Sync E E Pulse Code Word HCS361 Preamble Header Encrypt 84 Dead Time 258xT E LOGIC LOGIC Guard Fixed Code Portion Time DS40146E-page 13 ...
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... The HCS361 encoder powers itself up when a button is pushed and powers itself down after the current trans- mission is finished, if the user has already released the button ...
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... If the supply voltage drops below the low voltage trip signal is LOW point, the LED output will be toggled at approximately 1Hz during the transmission. TABLE 5-1: Approximate Supply Voltage Max 3.8V 3.8V 2.2V 2.2V Min *See also FLASH operating modes. HCS361 V Trip Point VS. LOW Temperature =0 Nominal Trip Point 3.8V 3 Nominal Trip Point 25 ...
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... S0 should be held low during the entire program cycle. The S1 line on the HCS361 part needs to be set or cleared depending on the LS bit of the memory map (Key 0) before the key is clocked in to the HCS361. S1 must remain at this level for the duration of the pro- gramming cycle. The device can then be programmed ...
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... Data hold time Data out valid time Note 1: Typical values - not tested in production. 2002 Microchip Technology Inc. Min 9 CLKL T 50 CLKH — DV HCS361 Max. Units 4.0 ms — ms — ms — s — s — (1) s — ( (1) s DS40146E-page 17 ...
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... HCS361 7.0 INTEGRATING THE HCS361 INTO A SYSTEM Use of the HCS361 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 HCS361 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. HCS361 technology patent scope includes a DS40146E-page 19 ...
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... HCS361 FIGURE 7-3: SYNCHRONIZATION WINDOW Entire Window rotates to eliminate use of previously used codes DS40146E-page 20 Blocked Window (32K Codes) Stored Synchronization Counter Value Double Operation (resynchronization) Single Operation Window Window (32K Codes) (16 Codes) 2002 Microchip Technology Inc. ...
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... V +0.3 0.55V 0.15V -0.3 0.15V DD 0. 0.08V 0.08V DD 1.0 4.0 0.15 1 120 160 80 120 pin and the LED pin. DD HCS361 Units °C (Note) °C (Note) V Max Unit Conditions 3. 6.6V DD 1.0 A 350 A +0 -1.0 mA 2.0V OH ...
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... HCS361 FIGURE 8-1: POWER-UP AND TRANSMIT TIMING Button Press Detect PWM Output Button Input Sn TABLE 8-3: POWER-UP AND TRANSMIT TIMING REQUIREMENTS V = +2.0 to 6.6V DD Commercial (C): Tamb = +70 C Industrial (I): Tamb = - +85 C Parameter Time to second button press Transmit delay from button detect ...
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... Encrypted Portion Sync E E Pulse Code Word SPM = 0 SPM = 1 10xT Sync Pulse E Serial Number Function Code MSB Bit 58 Bit 59 Bit 60 Bit 61 Bit 62 Bit 63 Bit 64 Bit 65 Fixed Portion of Transmission HCS361 LOGIC 0 LOGIC LOGIC 0 LOGIC ...
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... HCS361 FIGURE 8-5: VPWM FORMAT SUMMARY (MOD = 1) WAKE-UP (TXWAK=1) Preamble Sync Encrypt Dead Time FIGURE 8-6: VPWM WAKE-UP FORMAT (MOD= 33% Duty Cycle Wake-Up sequence 250xT FIGURE 8-7: VPWM PREAMBLE/HEADER FORMAT (MOD= SPM=1 SPM=0 18xT Preamble 10xT E Pulse FIGURE 8-8: VPWM DATA WORD FORMAT (MOD=1) ...
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... FIGURE 8-9: HCS361 NORMALIZED TE VS. TEMP 1.7 1.6 1.5 1.4 1.3 1 1.1 1.0 0.9 0.8 0.7 0.6 -50 -40 -30 -20 - 2002 Microchip Technology Inc. Typical T Max LEGEND DD = 2.0V = 3.0V = 6.0V T Min. E Temperature °C HCS361 DS40146E-page 25 ...
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... HCS361 TABLE 8-4: TIMING PARAMETERS: PWM MODE (TXWAK= +2.0 to 6.6V DD Commercial (C):Tamb = +70 C Industrial (I):Tamb = - +85 C Symbol Characteristic T Basic pulse element E T PWM bit pulse width BP T Preamble duration P T Sync Pulse duration S T Header duration H T Hopping code duration HOP ...
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... Code Words Transmitted Shortest Min Typ. Max. Min. 130 200 310 130 226 341 44.3 68.2 105.7 53.0 7692 5000 3226 7692 HCS361 Longest Typ. Max. Units 400 620 114 T E 296 ...
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... 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. DS40146E-page 28 Example HCS361 XXXXXNNN 0025 Example HCS361 XXX0025 NNN 2002 Microchip Technology Inc. ...
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... A2 .115 .130 .145 A1 .015 E .300 .313 .325 E1 .240 .250 .260 D .360 .373 .385 L .125 .130 .135 c .008 .012 .015 B1 .045 .058 .070 B .014 .018 .022 § eB .310 .370 .430 HCS361 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 3.43 0.20 0.29 0.38 1.14 1.46 1.78 0.36 0.46 0.56 7.87 9.40 10. ...
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... HCS361 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 ...
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... Conferences for products, Development Systems, technical information and more • Listing of seminars and events 2002 Microchip Technology Inc. HCS361 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: HCS361 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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... HCS361 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. HCS361 — /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 recom- mended workarounds ...
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... HCS361 NOTES: DS40146E-page 34 2002 Microchip Technology Inc. ...
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... 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. 2002 Microchip Technology Inc. Trademarks The Microchip name and logo, the Microchip logo, FilterLab ...
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... Centro Direzionale Colleoni Palazzo Taurus Colleoni 1 20041 Agrate Brianza Milan, Italy Tel: 39-039-65791-1 Fax: 39-039-6899883 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 2002 Microchip Technology Inc. ...