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RF68 Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers |
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RF68 Datasheet(HTML) 10 Page - List of Unclassifed Manufacturers |
10 / 21 page Page 10 RF68 Tel: + 86-755-82973805 Fax: + 86-755-82973550 E-mail: sales@hoperf.com http:/ / www.hoperf.com 4.3. Application Mode: Power & Go The default ‘Power & Go’ application mode sees the RF68 configured as detailed in Table 6. By changing the logical state of the CTRL pin at Power-up or Reset, two distinct configuration modes can be selected. The Power & Go application modes hence permit microcontroller-less operation. Table 6 Configuration in Power & Go Mode CTRL Pin Configuration Mode ‘Low’ FSK 868.3 MHz, +10 dBm, Fdev=+/-19.2 kHz Power&Go 1 ‘High’ OOK 433.92 MHz, +10 dBm Power&Go 2 4.4. Application Mode: Advanced 4.4.1. Advanced Mode: Configuration As described on Figure 4, Advanced mode is entered when accessing the Two Wire Interface (TWI) bus of the RF68. Upon communication to the register at up to 10 MHz of clocking speed, complete flexibility on the use of the chip is obtained. Once all register settings are selected (see registers detailed description in section [5]), the RF68 can be used either in Automatic mode by simply toggling the DATA pin, or in Forced Transmit mode to optimize timings for instance. 4.4.2. Frequency Hopping Spread Spectrum Frequency hopping is supported in Advanced mode. After sending the data stream in the first channel, the user can send a Frequency change instruction containing the new channel frequency. The circuit will automatically ramp down the PA, lock the PLL to the new frequency, and turn the Power Amplifier back on. The user can then send his packet data on the new channel. Timings are detailed hereafter: t < TOFFT (2 or 20 ms) TWI instruction t < TOFFT (2 or 20 ms) DATA Frequency change CTRL Frequency change RFOUT 5th falling edge on CTRL 24th falling edge on CTRL Tx Channel A TS_HOPi Tx Channel B Figure 6. Frequency Hopping Description Notes - During any TWI access, the input of the modulator is inhibited - The time between two Frequency change instructions shall be greater than TS_HOPi - FHSS modulation, as described under FCC part 15.247, is supported by the RF68; also note that the large Frequency Deviation settings available on the RF68 make it suitable for “Digitally Modulated Systems”, as described under FCC Part 15.247 (a)(2) |
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