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File name:Hcs101.pdf
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File name Hcs101.pdf

HCS101 Fixed Code Encoder FEATURES Operating · · · · · · · · · 2 Programmable 32-bit serial numbers 10-bit serial number 66-bit transmission code length Non-volatile 16-bit counter 3.5V -13.3V operation 3 inputs, 7 functions available Selectable baud rate Automatic code word completion Battery low signal transmitted to receiver The 8-pin HCS101 operates over a wide voltage range of 3.5V to 13.3V and has three button inputs allowing the system designer the freedom to utilize up to 7 functions. The only components required for device operation are the buttons and RF circuitry, allowing a very low system cost. PACKAGE TYPES PDIP, SOIC S0 S1 S2 NC 1 HCS101 2 3 4 8 7 6 5 VDD NC DATA VSS Other · · · · · · Pin-out compatible with most K EELOQ® Encoders Simple programming interface On-chip EEPROM On-chip oscillator and timing components Button inputs have internal pull-down resistors Minimum External Components required HCS101 BLOCK DIAGRAM Oscillator Controller RESET Circuit Power latching and switching Typical Applications The HCS101 is ideal for remote control applications. These applications include: · · · · · · · Low-end automotive alarm systems Low-end automotive immobilizers Gate and garage door openers Identity tokens Low-end burglar alarm systems Fan and lighting controls Toys EEPROM DATA Transmit register VSS VDD Button input port S2 S1 S0 DESCRIPTION The HCS101 from Microchip Technology Inc. is a fixed code encoder designed for remote control systems. It provides a small package outline and low cost to make this device a perfect solution for unidirectional remote control systems. It is also pin compatible with Microchip's HCS201 Code Hopping Encoder allowing easy upgrading to a more secure remote keyless entry (RKE) system. 2001 Microchip Technology Inc. Preliminary DS41115C-page 1 © HCS101 1.0 SYSTEM OVERVIEW The EEPROM data for each transmitter is programmed by the manufacturer at the time of production. Any type of controller may be used as a receiver, but it is typically a microcontroller with compatible firmware that allows the receiver to operate in conjunction with a transmitter, based on the HCS101. As indicated in the block diagram in Figure 1-1, the HCS101 has a small EEPROM array, which must be loaded with several parameters before use. These parameters include: · · · · Two 32-bit serial numbers 16-bit counter value Additional 10-bit serial number Configuration data FIGURE 1-1: BASIC OPERATION OF TRANSMITTER ENCODER Transmitted Information Serial Function Number 3 Bits Function Bits Counter Serial Number 1 EEPROM Array Serial Number 3 Counter Serial Number 1 © DS41115C-page 2 Preliminary 2001 Microchip Technology Inc. HCS101 2.0 DEVICE OPERATION As shown in the typical application circuits in Figure 21, the HCS101 is easy to use. It requires only the addition of buttons and RF circuitry for use as the transmitter in your application. A description of each pin is given in Table 2-1. The HCS101 will wake-up upo

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