HCS101-I/P Microchip

HCS101 HCS101 Fixed Code Encoder The 8-pin HCS101 operates over a wide voltage range FEATURES of 3.5V to 13.3V and has three button inputs allowing the system designer the freedom to utilize up to 7 func- Operating tions. The only components required for device opera- 2 Programmable 32-bit serial numbers tion are the buttons and RF circuitry, allowing a very low 10-bit serial number system cost. 66-bit transmission code length PACKAGE TYPES Non-volatile 16-bit counter PDIP, SOIC 3.5V -13.3V operation 3 inputs, 7 functions available 8 S0 VDD 1 Selectable baud rate NC 7 2 S1 Automatic code word completion Battery low signal transmitted to receiver 6 DATA 3 S2 Other VSS NC 4 5 Pin-out compatible with most KEELOQ Encoders Simple programming interface HCS101 BLOCK DIAGRAM On-chip EEPROM On-chip oscillator and timing components Power Oscillator Button inputs have internal pull-down resistors latching Controller and Minimum External Components required switching RESET Circuit Typical Applications The HCS101 is ideal for remote control applications. These applications include: EEPROM Low-end automotive alarm systems Low-end automotive immobilizers Transmit register DATA Gate and garage door openers Identity tokens Button input port Low-end burglar alarm systems VSS Fan and lighting controls VDD Toys 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 Microchips HCS201 Code Hopping Encoder allowing easy upgrading to a more secure remote keyless entry (RKE) system. 2001 Microchip Technology Inc. Preliminary DS41115C-page 1HCS101 The EEPROM data for each transmitter is programmed 1.0 SYSTEM OVERVIEW by the manufacturer at the time of production. As indicated in the block diagram in Figure 1-1, the Any type of controller may be used as a receiver, but it HCS101 has a small EEPROM array, which must be is typically a microcontroller with compatible firmware loaded with several parameters before use. These that allows the receiver to operate in conjunction with a parameters include: transmitter, based on the HCS101. 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 Function Counter Serial Number 1 Number 3 Bits Bits EEPROM Array Serial Number 3 Counter Serial Number 1 DS41115C-page 2 Preliminary 2001 Microchip Technology Inc.