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HCS320 Datasheet(PDF) 5 Page - Microchip Technology |
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HCS320 Datasheet(HTML) 5 Page - Microchip Technology |
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5 / 32 page  © 2001 Microchip Technology Inc. DS41097C-page 5 HCS320 2.0 DEVICE OPERATION As shown in the typical application circuits (Figure 2-1), the HCS320 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 TABLE 2-1: PIN DESCRIPTIONS The HCS320 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. B0 Tx out S0 S1 S2 SHIFT LED VDD PWM VSS 2 button remote control B1 Tx out S0 S1 S2 SHIFT LED VDD PWM VSS 5 button remote control(1) B3 B2 B1 B0 Note 1: The full 16 function codes are implemented using the shift button. 2: Resistor R is recommended for current limiting. +12V +12V R (2) R (2) SHIFT Name Pin Number Description S0 1 Switch input 0 S1 2 Switch input 1 S2 3 Switch input 2/Clock pin when in Programming mode SHIFT 4 Switch input for Shift VSS 5 Ground reference PWM 6 Pulse Width Modulation (PWM) output pin / Data pin for Programming mode LED 7 Cathode connection for LED VDD 8 Positive supply voltage |
Similar Part No. - HCS320 |
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Similar Description - HCS320 |
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