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CS8130-CS датащи(PDF) 10 Page - Cirrus Logic |
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CS8130-CS датащи(HTML) 10 Page - Cirrus Logic |
10 / 28 page Mode 3 (TV remote) Receive Choices The modulation frequency must be set into the modulator divider registers. The tolerance on the expected frequency must be programmed into the Receive ASK Timing Sensitivity (RATS) reg- ister. The RATS register sets the time window that the demodulator will accept for the period of valid data. Since the RATS register specifies time windows which are negative (e.g. 1000b (8) = +0.27 µs to -4.61 µs), then the modulation frequency must be set to lower than the desired nominal setting. For example, with RATS set to 1000 (8), and the desired nominal frequency be- ing 38 kHz, then set the modulation divider registers to 35.10 kHz. With these settings, the demodulator will accept any frequency from 34.78 kHz to 41.88 kHz as valid. Smaller RATS register settings will result in tighter tolerance on the accepted receive modulation frequency. Changes in the RATS register settings must be accompanied by changes in the modulation fre- quency register to keep the nominal desired frequency in the center of the valid frequency band. There are two TV remote receive data modes: "oversampled" mode and "programmed T pe- riod" mode. For "oversampled" mode, first choose the UART to CS8130 baud rate, typically 115.2 kbps. Then set the TV remote receive tim- ing register to a rate which is less than 80% of the UART baud rate. The CS8130 will now start sampling the demodulated infrared data at the TV remote receive sample rate. The stream of samples will be assembled into characters, with a start bit and a stop bit, and will be transmitted to the UART via RXD at the UART baud rate. The system software can then concatenate successive characters and reconstruct the incoming bit stream. "Programmed T period" mode requires that the bit period of the bursts of modulated carrier be known. This period is programmed into the TV remote receive timing registers. The UART to CS8130 baud rate must be set to at least 20% greater than 1/T. The CS8130 will now use the edges of the demodulated incoming infrared data to indicate each bit state. For continuous periods of low or high, the CS8130 will sample the level in the center of each incoming bit period (using T as the bit period). Any transition will reset the timer that is used for the sampling process, thereby eliminating errors caused by the sample timing being different to the incoming bit period. Characters are assembled and sent to the UART every 8 bits (see Figure 6). If the T period is not known, it is possible to measure T by using "oversampled" mode, and 1 0 1 1 00 1 110 0 11 0 01 1 0 0 1 01 1 00 1 1 1/2400 LIGHT INPUT RXD* RXD* LIGHT NO LIGHT Stop Bit 8 data bits Start Bit *RXD Baud rate can be set from 4800 to 115200 bps Figure 6. Mode 3 (TV remote) Receive Data Format CS8130 10 DS134PP2 CS8130 10 DS134F1 |
Аналогичный номер детали - CS8130-CS |
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Аналогичное описание - CS8130-CS |
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