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RMX2 Datasheet(PDF) 7 Page - Radiometrix Ltd |
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RMX2 Datasheet(HTML) 7 Page - Radiometrix Ltd |
7 / 12 page Radiometrix Ltd RMX2-433-10 Data sheet Page 7/12 ∫∫ ∫∫ ∫∫ ∫∫ DATA 1 Data st 1 Data st 2 Data nd 2 Data nd CLK LE RMX2 Terminal name #: t0,t5 >= 100 ns t1,t2,t6 >= 20 ns t3,t4 >= 30 ns #: Keep the LE terminal at a low level, w hen write the data to the shift resister. MSB CS LDS FC SW R14 R13 R1 16 14 13 12 11 10 15 CNT=1 Invalid data N11 N10 N9 N8 N7 N6 A1 CNT=0 LSB Figure 5: PLL IC programming timing diagram The PLL IC, which operates as shown in the block diagram in the manual, shifts the data to the 19-bit shift register and then transfers it to the respective latch (counter, register) by judging the CNT control bit value input at the end. CLK [Clock]: Data is shifted into the shift register on the rising edge of this clock. LE [Load Enable]: Data in the 19-bit shift register is transferred to respective latches on the rising edge of the clock. The data is transferred to a latch according to the control bit CNT value. Data [Serial Data]: You can perform either reference counter setup or programmable counter setup first. TIMING CHART Control timing in a typical application is shown in Figure 3. Initialisation of the radio is performed following power-up and successful reset of the controlling CPU. The FET switches controlling the radio module systems (controlled by RXSEL and TXSEL) must be set to inactive (pin high or floating) to avoid unwanted emissions. The power supply to the radio module is then turned on. When the radio module is first powered, the PLL internal registers are not yet set to meaningful values, and the VCO circuit will be unstable. Data transmission and reception is only possible 40 ms after the first set up data is sent to the PLL. Subsequent ‘channel change’ re-programming only takes 20 ms before data can be handled. Changing channels must be carried out in the receive mode. If switching is performed in transmission mode, unwanted interference will be generated. If the module is switched to the receive mode when operating in the same channel, (a new PLL setting is not necessary) it can receive data within 5 ms of switching*1. For data transmission, if the RF channel to be used for transmission is set while still in receiving mode, data can be sent at 5 ms after the radio module is switched from reception to transmission*2. Check that the Lock Detect signal is “high” 20 ms after the channel is changed. In some cases the Lock Detect signal becomes unstable before the lock is correctly detected, so it is necessary to note if processing of the signal is interrupted. *1: DC offset may occur due to frequency drift caused by ambient temperature change. Customers are urged to verify operation at low temperature and nitiali their timing. *2: Sending ‘10101…..’ preamble just after switching to transmission mode enables smoother operation of the data extraction circuit used by the receiver. For 9600 bps, a preamble of ‘11001100’ is effective. Recommended preamble length: -10 °C -+55°C: 7 ms -20 °C - +65 °C (for operation exceeding the above range): 15 ms |
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