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HCS201 Datasheet(PDF) 5 Page - Microchip Technology |
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HCS201 Datasheet(HTML) 5 Page - Microchip Technology |
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5 / 28 page  © 2001 Microchip Technology Inc. DS41098C-page 5 HCS201 2.0 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 TABLE 2-1: PIN DESCRIPTIONS The HCS201 will wake-up upon detecting a button press and delay approximately 10 ms for button debounce (Figure 2-2). The synchronization counter, discrimination value and button information will be encrypted to form the hopping code. The hopping code portion will change every transmission, even if the same button is pushed again. A code word that has been transmitted will not repeat for more than 64K transmissions. This provides more than 18 years of use before a code is repeated; based on 10 operations per day. Overflow information sent from the encoder can be used to extend the number of unique transmissions to more than 192K. If in the transmit process it is detected that a new but- ton(s) has been pressed, a RESET will immediately occur and the current code word will not be completed. Please note that buttons removed will not have any effect on the code word unless no buttons remain pressed; in which case the code word will be completed and the power-down will occur. VDD B0 Tx out S0 S1 S2 VDDB STEP VDD DATA VSS Two button remote control B1 Tx out S0 S1 S2 STEP VDD DATA VSS Four button remote control B3 B2 B1 B0 Note: Up to 7 functions can be implemented by pressing more than one button simultaneously or by using a suitable diode array. S0 S1 S2 STEP VDD DATA VSS VDDB VDDB VDD Tx out Three button remote control with Step up regulator VDD 2.0-6.0V External components sample values: R = 5.1 K Ω L = 390 uH Q = 2N3904 C = 1.0 uF D = ZHCS400CT (40V 0.4A Zetex) (see Section 5.6 for a description of the Step Up circuit) R L D C Q Pin Name Pin Number Pin Description S0 1 Switch input 0 S1 2 Switch input 1 S2 3 Switch input 2 / Clock pin for Programming mode VDDB 4 Battery input pin, supplies power to the step up control circuitry VSS 5 Ground reference connection DATA 6 Pulse Width Modulation (PWM) output pin / Data pin for Programming mode STEP 7 Step up regulator switch control VDD 8 Positive supply voltage |
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