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NM95HS01EN14 Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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NM95HS01EN14 Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 20 page General Transmitter Circuit Configurations Figure 3 shows several typical circuit configurations for a HiSeC based RKE system transmitter Note that all circuits require few external components beyond a battery and transmitter stage IR and RF bit timing may be optimized through the timer block settings in the EEPR0M array which allows flexibility in selecting the smallest and least expen- sive clock components in the chosen design range The first two circuits are examples of RF transmitter applica- tions with both RC and crystal (XTAL) oscillator clocks the third circuit is an example of an IR transmitter application Two circuits are configured for an LED Note that the LED pin refers to a visual indicator LED and not the IR LED which might be used in an IR transmitter circuit The LEDSEL bit in the EEPROM array determines whether the RFEN LED or CKOLED pins are dedicated to the LED for a particular circuit configuration LED pin select options are detailed in Table I Design considerations for selecting and optimizing clock component values are detailed in the Generator Clock De- sign Parameters section General Receiver Circuit Configurations The NM95HS0102 HiSeC Generator with the standard customer algorithm is matched to a companion partthe MM57HS HiSeC Decoder For applications requiring more extensive receiver design and decoder programming a COPS8xxxNM93Cx6 package is recommended A com- plete discussion of receiver oonfigurations and considera- tions can be found in the National Semiconductor Applica- tion Note How to Design and Program a HiSeC RKE Re- ceiver using an 8-Bit Microcontroller TLD12302 – 3 FIGURE 3 Typical Transmitter Circuit Configurations TABLE I LED Pin Select Options Clock LEDSEL RFEN LED CKOLED Function RC X RFEN LED RF Mode with LED XTAL 0 LED CKO RF Mode wo LED XTAL 1 RFEN CKO IR mode with LED Either the LED or RFEN outputs of the NM95HS0102 can be used to indicate device transmis- sion The LED output is active during a pause whereas the RFEN output is active during frame transmission The IR Drive Current is 10 mA so an amplifier stage may be needed http www nationalcom 4 |
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