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EVB7122-433-FM-C Datasheet(PDF) 7 Page - Melexis Microelectronic Systems |
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EVB7122-433-FM-C Datasheet(HTML) 7 Page - Melexis Microelectronic Systems |
7 / 24 page EVB7122 27 to 930MHz Transceiver Evaluation Board Description 39012 07122 02 Page 7 of 24 EVB Description Rev. 005 June/07 Due to the static CMOS design, the SCI consumes virtually no current and it can be programmed in active as well as in standby mode. If the transceiver is set from standby mode to any of the active modes (idle, receive, transmit), the SCI settings remain the same as previously set in one of the active modes, unless new settings are done on the SCI while entering into an active mode. Fig. 3: Serial Data Input Timing 3 Register Description As shown in the previous section there are four control words which stipulate the operation of the whole chip. In Stand-alone User Mode SUM the intrinsic default values with respect to the applied levels at pins FS0 and FS1 lay down the configuration of the transceiver. In Programmable User Mode (PUM) the register settings can be changed via 3-wire interface SCI. The default settings which vary with the desired operating frequency depend on the voltage levels at the frequency selection pins FS0 and FS1 before entering the PUM. Table 5.1.1 shows the default register settings of different frequency selections. It should be noted that the channel frequency listed below will be achieved with a crystal frequency of 7.1505 MHz. The following table depicts an overview of the register configuration of the TH7122. t ES tCWL t CS tCWH t CH t EW t EH SDEN SDTA bit 23 bit 22 bit 1 bit 0 MSB Invalid data Invalid data LSB SCLK |
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